KR100442738B1 - 3-Dimensional Image Display Device Using Radial Projection - Google Patents

Abstract

The present invention relates to a volumetric image display apparatus using radiation projection that can display the exterior and the interior of an object in three-dimensional space in three dimensions. To this end, the connecting rod 9 is rotatable at a constant angular velocity about one end, and the first mirror 22 is inclined at a predetermined angle on the rotation axis; A light source 1 and a shutter device 5 installed at the other end of the connecting rod 9; A target lens 7; The connecting rod 9 is rotatably provided therein, a second mirror 24 for reflecting the image reflected from the first mirror 22 is provided on the rotation axis, and the second mirror is provided at an edge thereof. Rotating plates 32 and 42 provided with a third mirror 26 for reflecting the image reflected from the 24; A screen (10) installed on the axis of rotation and rotatable with the rotary plates (32, 42) and projecting an image reflected from the third mirror (26); And a film installed in the shape of a ring on the rotating plates 32 and 42 and positioned between the rotating light source 1 and the shutter device 5 and photographing an external shape or a cross section of an object at a predetermined angle in a radial direction ( 3) is provided.

Description

Volumetric Image Display Device Using Radiation Projection {3-Dimensional Image Display Device Using Radial Projection}

The present invention relates to a three-dimensional volumetric image display apparatus, and more particularly, to a volumetric image display apparatus using radiation projection that can display the appearance of an object in three-dimensional space in three dimensions.

In general, as a method for obtaining a 3D image, a stereoscopic photograph using a hologram or a stereoscopic movie that looks at a screen with special glasses is known. In the case of holograms, objects are displayed three-dimensionally by using the wavelength characteristics of light rays, but the visible region is also limited to a two-dimensional plane. Therefore, there is a disadvantage that the realism is inferior, and there is a limit in the expression of color.

In the case of a three-dimensional film, the screen is divided by an interlaced pattern that is responsible for the right and left fields of vision, and then each of the fields of view is made by using glasses or lenticular lenses that are specially made according to the refresh rate of the screen. The projection method was used. However, this conventional method has a disadvantage in that it cannot provide a field of view more than 180 degrees with respect to the plane in that it is a display method based on two dimensions.

To remedy this, the concept of direct volume display, which provides images in real space, began in 1950. In other words, the volume information is encoded in a flat screen or a light source that rotates at a high speed, and the light rays of the object are perceived in the volume in the screen rotated by the afterimage of time. For example, US Pat. Nos. 2,967,905 (M. Hirdsch, 1961) and 3,140,415 (R.D. Ketchpel, 1964) used a method of scanning a CRT's electron beam on a high-speed rotating screen.

Subsequently, volumetric image output devices of US Pat. Nos. 4,063,233 (Rowe in 1977) and 4,881,068 (Korevaar in 1989) were developed due to the development of semiconductor / laser technology. .

In order to overcome this limitation, a direct volume image display device capable of moving images using a high speed laser scanner and an LCD projector has also been developed. For example, it represents a volume by projecting onto a plane or a helix structure (USP 5,042,909 / USP 4,871,231 / USP 5,148,310). However, the drawback of this invention is that the number of pixels and the colors expressed are limited by the color of the laser and the speed of the scanner, so that a plurality of colors or images larger than 24 inches cannot be output.

In addition, to overcome the shortage of pixels, a method of arranging movie films in an annular shape and using a strobe light source synchronized with rotation without a shutter (USP 4,294,523) was devised, but the viewing angle was limited to a plane, and the output part was a gear-like rotating screen. Because of its part, it was impossible to enlarge.

Accordingly, the present invention has been made to solve the above problems, the first object of the present invention is to project an image on a rotating screen to display a three-dimensional volumetric image, while being capable of high-definition and large-scale radiation projection It is to provide a volume image display device using.

A second object of the present invention is to provide a volumetric image display apparatus using radiation projection that can display different images by controlling the position of the film by arranging a plurality of images of different objects on the film.

An object of the present invention as described above, the connecting rod 9 is rotatable at a constant angular velocity about one end, the first mirror 22 is inclined at a predetermined angle on the rotation axis; A light source (1) installed at the other end of the connecting rod (9) for projecting light toward the first mirror (22); A shutter device (5) installed between the light source (1) and the first mirror (22) of the other end of the connecting rod (9); A target lens 7 installed between the shutter device 5 and the first mirror 22 of the other end of the connecting rod 9; The connecting rod 9 is rotatably provided therein, a second mirror 24 for reflecting the image reflected from the first mirror 22 is provided on the rotation axis, and the second mirror is provided at an edge thereof. Rotating plates 32 and 42 provided with a third mirror 26 for reflecting the image reflected from the 24; A screen (10) installed on the axis of rotation and rotatable with the rotary plates (32, 42) and projecting an image reflected from the third mirror (26); And a film installed in the shape of a ring on the rotating plates 32 and 42 and positioned between the rotating light source 1 and the shutter device 5 and photographing an object's appearance and cross section at predetermined angles in a radial direction. 3) can be achieved by a volumetric image display device using radiation projection.

The rotating plate may include a first rotating plate 32 disposed below the connecting rod 9 and provided with a third mirror 26 at an edge thereof, and having a second rotating shaft 20 formed in an axial direction; A second spaced apart from the second rotating plate 32 by a predetermined distance and positioned above the connecting rod 9, the film 3 is provided along the circumferential direction, the second mirror 24 is fixed on the axis of rotation Rotating plate 42; And a plurality of first columns 34 for interconnecting the circumferential circumferences of the first rotating plate 32 and the second rotating plate 42.

In addition, a plurality of through holes 38 are formed in the second rotating plate 42, and a plurality of second columns 36 inserted into the through holes 38 and moved in the axial direction on the upper portion of the film 3. ) Is further formed, and one side of the second rotating plate 42 further includes a vertical driving device 40 capable of controlling the axial position of the second column 36, wherein the film 3 is Films photographing different objects are connected in the axial direction, and it is more preferable to project each object onto the screen 10 according to the axial position.

In addition, the film 3 is formed with an index hole 44 corresponding to each image 46, the laser 50 is installed on one side of the light source (1) to be irradiated toward the index hole (44); An optical sensor 52 for detecting laser light passing through the index hole 44; It is possible to further include a shutter synchronization device 54 for synchronizing the output signal of the optical sensor 52 with the shutter device 5.

In addition, the first rotating shaft 18 formed on one end of the connecting rod (9); A first motor (14) for rotating the first rotating shaft (18); And a second motor 12 for rotating the second rotation shaft 20.

Here, the rotational angular velocity of the second rotation shaft 20 is higher than the rotational angular velocity of the first rotation shaft 18, the rotational speed of the second rotation shaft 20 is in the range of 300 ~ 600 rpm, the first rotation shaft 18 It is more preferable that the rotation speed of h) is less than 0.5 ~ 10rpm.

In addition, the cylindrical base 28 is provided with the rotating plate (32, 42) and the first and second motors (14, 12); A transparent cylindrical structure 30 connected to the base 28 and forming a space therein for the screen 10 to rotate therein; And a support frame 62 having one end fixed to the base 28 and the other end connected to the screen 10 through the cylindrical structure 30. It is possible to include more.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

1 is a cross-sectional view of a volumetric image display apparatus using radiation projection according to a first embodiment of the present invention;

FIG. 2 is a schematic exploded perspective view of the volume image display device shown in FIG. 1;

3 is a partially enlarged view of the film 3 and the film 3 shown in FIG. 2, FIG.

4 is a schematic block diagram of an area of a light source 1, a film 3, a shutter device 5, and a target lens 7 in FIG. 1;

5 is a configuration perspective view for explaining the operation of the laser 50 and the optical sensor 52 in the block diagram shown in FIG.

6 is a cross-sectional view of a volumetric image display apparatus using enlarged radiation projection according to a second embodiment of the present invention;

FIG. 7 is an external perspective view of the volume image display device shown in FIG. 6.

<Short Description of Main Reference Signs>

1: light source, 3: film,

5: shutter device, 7: target lens,

9: connecting rod, 10: screen,

18: first axis of rotation, 20: second axis of rotation,

22: first mirror, 24: second mirror,

26: third mirror, 28; Base,

30: cylindrical structure, 32: first rotating plate,

34: first column, 36: second column,

38: through hole, 42: second rotating plate,

44: index hole, 48: holder,

50: laser, 52: optical sensor,

54: shutter synchronization device, 60: banner,

62: support frame.

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

1 is a cross-sectional view of a volumetric image display apparatus using radiation projection according to a first embodiment of the present invention, Figure 2 is a schematic exploded perspective view of the volumetric image display apparatus shown in FIG. As shown in FIG. 1 and FIG. 2, the volumetric image display device of the present invention has a substantially cylindrical shape and includes a transparent cylindrical structure 30 at an upper portion and a base 28 at a lower portion thereof. The screen 10 is where the image is projected, and may rotate at a constant angular velocity in the cylindrical structure 30.

The rotating shaft of the first motor 14 is connected to the first rotating shaft 18, and the first mirror 22 is inclined at an angle of about 45 degrees at the end of the first rotating shaft 18. The connecting rod 9 extending horizontally from the first rotation shaft 18 has a light source 1, a shutter device 5, a target lens 7, and a laser 50 and an optical sensor 52 at the ends thereof. ), A shutter synchronous device 54 is mounted. That is, the device mounted on the connecting rod 9 rotates integrally with the first rotation shaft 18.

The light source 1 may emit light having high illuminance toward the first mirror 22, that is, the axial direction, and the shutter device 5 mounted on the optical path blocks or passes the light of the light source 1 at regular intervals. It has a structure to let. The object lens 7 is positioned on an optical path of light passing through the shutter device 5 and functions to illuminate an image with the first mirror 22. To this end, the interior of the object lens 7 is composed of a combination of a plurality of convex lenses and concave lenses.

The rotating shaft of the second motor 12 is connected to the second rotating shaft 20 through the gear train 16. The second rotating shaft 20 is integrally formed at the center of the first rotating plate 32, and is formed to be hollow so that the first rotating shaft 18 can pass therethrough. The third mirror 26 is fixed to the edge of the first rotating plate 32. The third mirror 26 rotates integrally with the first rotating plate 32 and functions to project an image on the screen 10.

The second rotary plate 42 is positioned at a vertical distance from the first rotary plate 32 by a predetermined distance, and is fixed to the first rotary plate 32 by six first columns 34. Three through holes 38 are formed in the middle region of the second rotating plate 42, and the second column 36 is inserted into each of the through holes 38 to be movable.

The second mirror 24 is fixed at a position where the center region of the second rotating plate 42 and the screen 10 meet and are configured to rotate together with the second rotating plate 42.

The film 3 is fixed to the lower surface of the second rotating plate 42 as if it is suspended by the second column 36. The film 3 is substantially ring-shaped, and the image which image | photographed the cross section of the object for every predetermined angle along the circumferential direction is arranged sequentially. For example, if a cross section of an object called vase is photographed every 1 degree while rotating in the horizontal direction, 360 images are sequentially arranged on the film 3. If the image and image are made every 1 degree while rotating the exterior and cross-section of the three-dimensional graphic data (rendered CAD data) of the vase in the horizontal direction, 360 images are sequentially arranged on the film 3.

The second column 36 is movable in the vertical direction in the through hole 38, and the position in the vertical direction may be controlled by the vertical driving device 40. That is, a step motor (not shown) is provided inside the vertical drive device 40, and a rack is formed on the surface of the second column 36 to rotate the step motor by a predetermined angle in accordance with an external pulse command. The vertical position of column 36 can be controlled. As shown in FIG. 1, the vertically movable film 3 is located in the light source 1 and the shutter device 5 devices.

3 is a partially enlarged view of the film 3 and the film 3 shown in FIG. 2. As shown in FIG. 3, three second columns 36 are formed on the ring-shaped film 3, and the film 3 is composed of a holder 48 and an image 46.

The holder 48 has a constant strength and elasticity while maintaining the physical ring shape, and serves to firmly fix each image 46 so that each image 46 is not distorted or dislodged during rotation. The holder 48 may be made of paper, plastic, or synthetic resin.

The image 46 is a film photographing the appearance of an object to be output at a specific angle, and may be, for example, a slide film or a movie film. By arranging the three films in the axial direction and changing the vertical position of the film by simple operation, three different objects (e.g., 46a is a water bottle, 46b is a car, 46c is a mobile phone) can be displayed. In the embodiment of FIG. 3, only three image arrays are displayed, but five or more arrays may be arranged as necessary.

In each image 46, an index hole 44 penetrates through the image 46. The index hole 44 is located at the axial center of the image 46 so as to know that the image 46 to be projected is in the correct position.

FIG. 4 is a schematic block diagram of a region of a light source 1, a film 3, a shutter device 5, and a target lens 7 in FIG. 1, and FIG. 5 is a laser 5 in the block diagram shown in FIG. And a configuration perspective view for explaining the operation of the optical sensor 52. As shown in FIGS. 4 and 5, the laser 5 is located above the light source 1 and irradiates toward the film 3. The optical sensor 52 is arranged to receive the laser light transmitted through the index hole 44, and the output signal of the optical sensor 52 is connected to the shutter synchronizer 54.

6 is a cross-sectional view of a volumetric image display apparatus using radiation projection according to a second embodiment of the present invention, and FIG. 7 is an external perspective view of the volumetric image display apparatus shown in FIG. 6. As shown in Figures 6 and 7, the second embodiment is largely configured with a cylindrical structure 30 and a base 28 to accommodate a large screen 10 of about 40 inches or more. In particular, the connecting rod 9, the light source 1, the target lens 7 and the like have the same size as the first embodiment, but the radius of the first rotating plate 32 is larger.

And, the support frame 62 is further reinforced so that the large screen 10 can rotate stably at high speed. One end of the support frame 62 is connected to the base 28, and the other end is fixed to the top of the screen 10 on the axis. Therefore, the screen 10 on which both ends are rotationally supported can be more stably rotated.

Banner 60 is made of a fabric, it has a configuration to cover the cylindrical structure 30 to protect the interior when the image projected on the screen 10 in the day or in direct sunlight is not visible. If the advertising text is printed on the surface of the banner 60, the function as an advertising tower can be performed at the same time.

Hereinafter, an operation method of the volume image display device using the radiation projection having the above configuration will be described in detail.

First, the film 3 is prepared by the following process. That is, 360 images 46 are prepared by photographing the object while changing the angle or appearance of the object (for example, a water bottle) by one degree in the horizontal direction. In this case, the object may be a real object or three-dimensional graphic data (rendered CAD data). The images 46 are continuously arranged in a band shape, and then connected in a ring shape to complete the film 3. When the finished film 3 is installed on the second rotating plate 42, the preparation for displaying the volume image is completed.

The light emitted from the light source 1 passes through the film 3, passes through the shutter device 5, and passes through the object lens 7. The light passing through the object lens 7 is collected in the first mirror 22, and the image reflected by the second mirror 22 is directed to the third mirror 26 through the second mirror 24. The image reflected from the third mirror 26 is projected onto the screen 10.

At this time, the first motor 14 rotates the first rotating shaft 18 at a constant angular speed, and due to the rotation of the first rotating shaft 18, the first mirror 22 and the connecting rod 9 at the same speed. Will rotate. Rotation of the connecting rod 9 means rotation of the light source 1, the shutter device 5, etc. mounted on the connecting rod 9.

In addition, the second motor 12 rotates the second rotation shaft 20 at a constant angular speed through the gear train 16, and due to the rotation of the second rotation shaft 20, the first, second, and rotation plates 32 and 42. ) Rotates integrally. At this time, the rotation speed of the second rotation shaft 20 is about 600 rpm, and the rotation speed of the first rotation shaft 18 is between about 0.5-10 rpm, which is lower than the rotation speed of the second rotation shaft 20. The rotation of the first rotating shaft 18 serves to make the projected volume image appear to rotate slowly. Rotation of the first rotating plate 32 causes rotation of the second and third mirrors 24, 26, the film 3, and the screen 10.

The laser light emitted from the laser 50 passes through the index hole 44 due to the difference between the rotational speed of the film 3 and the rotational relative speed of the light source 1. Accordingly, the optical sensor 52 outputs a waveform such as a pulse wave, and the shutter synchronization device 54 synchronizes the shutter speed of the shutter device 5 according to the period of the waveform. That is, when the image 46 of the rotating film 3 comes to the center of the light source 1, it is synchronized with the light source 1 and is exposed.

Therefore, the observer around the cylindrical structure 30 can see the volume image of the object rotated by the low speed rotation of the first rotating shaft 18 at any position. In an embodiment, the image projected on the screen 10 is displayed with a translucent stereoscopic volume image such as a semitransparent jellyfish swimming in the sea. Thus, the observer can see not only the appearance of the object but also the internal structure in three dimensions.

The first, second, and third mirrors 22, 24, and 26 of the present invention are positioned at right angles (beveled) to the screen 10 as relay mirrors, so that they are projected in a trapezoidal shape rather than a rectangle. Therefore, the Nearest-Neighbor deformation may be used to correct this into a quadrangle, and detailed parameters may be determined by trial and error or optically according to the projection position, size, angle, and the like.

In the embodiment, 200 slide films of about 15 mm x 15 mm were used, and the rotation speed of the screen was 600 rpm. In this case, the cylindrical structure 30 has a diameter of about 1 m, and has a radial resolution of 360 degrees / 200 = 1.8 degrees. In addition, in order to radially implement 200 slide films under such conditions, a high-speed shutter device for imaging a total of 200 x 10 = 2,000 frames / sec at 10 frames per second is required. However, commercially available high speed electronic shutters (magneto-optical electro-optical shutters) capable of up to 11,000 frames per second are commercially available.

3 and 4, if the vertical position of the film 3 is to be changed, a pulse command is input to the vertical driving device 40. Then, the built-in stepping motor (not shown) or servomotor (not shown) rotates to rotate the pinion (not shown) to transfer the rack (not shown) of the second column 36 in the vertical direction. The vertical conveyance of the second column 36 leads to the conveyance of the film 3, and as shown by the arrow of FIG. 4, the vertical position of the film 3 placed in front of the light source 1 is changed. Then, the image displayed on the screen 10 is changed to another object (for example, a water bottle to a car).

In the present invention, a slip ring (not shown) was used to supply electric power to the first rotating plate 32 and the connecting rod 9 in addition to the torque. Such a known slip ring has a structure capable of supplying a direct current power source or an alternating current power source on a rotating shaft.

In the present invention, three mirrors are used, but one, two or four, five or more may be selected and arranged according to the size of the cylindrical structure. In addition, the screen 10 may be made of a white fabric or may form a plurality of fine through holes on the surface in order to reduce the resistance of the air at high speed.

In addition, in the present invention, two motors are installed to use two rotation shafts, but the two rotation shafts may be simultaneously rotated at different speeds by generating torque reduced at different speeds from one motor. In addition, power transmission between the motor and the rotating shaft is also direct transmission, but may be applied using mechanical parts such as gear train, belt, and friction wheel.

The index hole 44 of the present invention means a through hole formed separately in the holder 48, but a film edge formed on a conventional 9mm movie film may be used. In addition, weights can be installed on the connecting rod and the turntable to reduce vibration and noise caused by rotation.

According to the volumetric image display apparatus using the radiation projection as described above, it is possible to display a three-dimensional volumetric image by projecting the image on the rotating screen, while also being able to achieve high quality and large size. Therefore, it can be widely used for commercial purposes such as various advertisements, academics, and presentations.

In addition, by arranging a plurality of images of different objects on the film, it is possible to easily change and display different images by controlling the position of the film. Therefore, it is possible to pursue a variety of displays, and to implement a simple video.

Then, by rotating the film in synchronization with the screen, there is an economical advantage that a sensor and an adjusting device for correcting the discrepancy of the rotational speed are unnecessary. In addition, there is an advantage that the imbalance of the rotational speed is not sensitive to the degradation of the image.

In the present invention, by directly projecting a high-quality image using a slide film can be used for large outdoor advertising.

In addition, the screen has a constant focal length by always keeping a constant distance from the film. Thus, there is no need for optical correction to focus. In addition, the conventional LCD or laser scanning method requires a sensor for precisely measuring the rotation speed because the position of the rotating body and the output image must be synchronized at all times. However, the present invention always provides a 1: 1 contrast between an image and a screen. As a result, the composition and distortion of the spatial image are not sensitive to the speed of the rotating body.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will cover such modifications and variations as fall within the spirit of the invention.

Claims (8)

A connecting rod 9 capable of rotating at a constant angular velocity about one end and having a first mirror 22 inclined at a predetermined angle on a rotation axis; A light source (1) installed at the other end of the connecting rod (9) for projecting light toward the first mirror (22); A shutter device (5) installed between the light source (1) and the first mirror (22) of the other end of the connecting rod (9); A target lens 7 installed between the shutter device 5 and the first mirror 22 of the other end of the connecting rod 9; The connecting rod 9 is rotatably provided therein, a second mirror 24 for reflecting the image reflected from the first mirror 22 is provided on the rotation axis, and the second mirror is provided at an edge thereof. Rotating plates 32 and 42 provided with a third mirror 26 for reflecting the image reflected from the 24; A screen (10) installed on the axis of rotation and rotatable with the rotary plates (32, 42) and projecting an image reflected from the third mirror (26); And A film 3 installed in the ring shape on the rotating plates 32 and 42 and positioned between the rotating light source 1 and the shutter device 5 and photographing the external shape or cross section of the object at a predetermined angle in the radial direction (3). Volumetric image display using radiation projection, characterized in that consisting of. The method of claim 1, wherein the rotating plate, A first rotating plate 32 positioned below the connecting rod 9 and provided with a third mirror 26 at an edge thereof and having a second rotation shaft 20 in an axial direction; A second spaced apart from the second rotating plate 32 by a predetermined distance and positioned above the connecting rod 9, the film 3 is provided along the circumferential direction, the second mirror 24 is fixed on the axis of rotation Rotating plate 42; And And a plurality of first columns (34) for interconnecting the circumferential circumferences of the first rotating plate (32) and the second rotating plate (42). The method of claim 2, A plurality of through holes 38 are formed in the second rotating plate 42, A plurality of second columns 36 are further formed on the film 3 to be inserted into the through holes 38 and move in the axial direction. One side of the second rotating plate 42 further includes a vertical drive device 40 for controlling the axial position of the second column 36, The film (3) is a volume image display device using radiation projection, characterized in that the film photographing different objects are connected in the axial direction, and projecting each object on the screen (10) according to the axial position. The method according to claim 1 or 3, The film 3 is formed with an index hole 44 corresponding to each image 46, A laser 50 installed at one side of the light source 1 and irradiated toward the index hole 44; An optical sensor 52 for detecting laser light passing through the index hole 44; And a shutter synchronization device (54) for synchronizing the output signal of the optical sensor (52) with the shutter device (5). The method of claim 2, A first rotating shaft 18 formed at one end of the connecting rod 9; A first motor (14) for rotating the first rotating shaft (18); And And a second motor (12) for rotating the second rotating shaft (20). 6. The volume image display device according to claim 5, wherein the rotational angular velocity of the second rotational shaft (20) is higher than the rotational angular velocity of the first rotational shaft (18). 7. The volume image display device according to claim 6, wherein the rotation speed of the second rotation shaft is in a range of 300 to 600 rpm. The method according to claim 1, 2 or 5, A cylindrical base 28 provided with the rotating plates 32 and 42 and the first and second motors 14 and 12; A transparent cylindrical structure 30 connected to the base 28 and forming a space therein for the screen 10 to rotate therein; And A support frame 62 having one end fixed to the base 28 and the other end connected to the screen 10 through the cylindrical structure 30; Volumetric image display device using radiation projection further comprising a.