JP6743364B2 - Spherical projection display device and method of driving spherical projection display device - Google Patents

Description

The present invention relates to a spherical projection display device and a driving method of the spherical projection display device.

2. Description of the Related Art Conventionally, as a display device that displays an image or a character that is printed or imaged on a film that transmits light, a device that forms a projection with a film or the like, a light source, and an optical element has been widely used. All of these display devices focus at a narrow angle of a long focus of several tens of centimeters or more.

Further, as a short-focus display device, a spherical projection display device that projects an image based on image data through a liquid crystal and focuses at a distance of less than 5 cm from a lens tip has been proposed (for example, Patent Document 1). 1).

Patent No. 5682811

In the short-focus display device as described above, the screen may become dark when a high-definition image having high color purity is displayed due to the trade-off between the number of pixels of the liquid crystal element and the aperture ratio. Therefore, it is difficult to display an image with higher definition or an image with high color purity brightly. Further, since the definition of the image to be displayed depends on the resolution of the liquid crystal element, there is a limit to increase the definition.

Further, when the liquid crystal element is interposed, a liquid crystal element, a drive substrate for driving the liquid crystal element, an image storage device (ROM substrate) for storing an image displayed on the liquid crystal element, etc. are required.

The present invention has been made in view of the above circumstances, and provides a spherical projection display device capable of high-definition display with high color purity and a driving method of the spherical projection display device.

A spherical projection display device according to an aspect of the present invention includes a spherical screen having an inner surface that constitutes a part of a spherical surface as a projection surface, a light source, and a light source optical system unit that emits light from the light source as parallel light. A projection optical system unit that compensates the parallel light emitted from the light source optical system unit and emits the parallel light to the spherical screen, and at least a part is arranged between the light source optical system unit and the projection optical system unit. A plurality of transmissive films having image information, wherein the plurality of films are arranged at a predetermined distance in a direction in which parallel light is emitted from the light source optical system unit, Film includes at least one plate-shaped first film, is in contact with one end of the first film, is rotated by a rotation shaft driven by a motor, and is an elastic body that presses the other end of the first film. The cam further includes a disc that is attached to the rotary shaft and has a non-constant distance from a position attached to the rotary shaft to a circumference, and the cam has the first circumference on the circumference of the circle. The first film is slid bidirectionally between the cam and the elastic body by contacting one end of the film and rotating the disc.

According to the present invention, it is possible to provide a spherical projection display device capable of displaying with high definition and high color purity.

FIG. 1 is a diagram schematically showing a configuration example of a spherical projection display device according to the first embodiment of the present invention. FIG. 2 is a diagram for explaining an example of the projection optical system of the spherical projection display device shown in FIG. FIG. 3 is a diagram for explaining an example of a drive system of the spherical projection display device shown in FIG. FIG. 4 is a diagram for explaining an example of a film feeding mechanism of a drive system of the spherical projection display device shown in FIG. FIG. 5 is a diagram for explaining one configuration example of the spherical projection display device according to the second embodiment of the present invention. FIG. 6 is a diagram for explaining an example of a drive system of the spherical projection display device shown in FIG. FIG. 7 is a diagram for explaining an example of a driving method of the spherical projection display device according to the first embodiment and the second embodiment of the present invention. FIG. 8 is a diagram for explaining a configuration example of the spherical projection display device according to the third embodiment of the present invention. FIG. 9 is a diagram for explaining one configuration example of the spherical projection display device according to the fourth embodiment of the present invention. FIG. 10 is a diagram for explaining a configuration example of a cross section taken along line AA shown in FIG. 9.

Hereinafter, embodiments will be described with reference to the drawings. However, it should be noted that the drawings are schematic or conceptual, and the dimensions and proportions of the drawings are not necessarily the same as the actual ones. Further, even when the same portions are shown in the drawings, the dimensional relationships and ratios may be different from each other. In particular, some embodiments described below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention depends on the shape, structure, arrangement, etc. of constituent parts. Is not specified. In the following description, elements having the same functions and configurations are designated by the same reference numerals, and redundant description will be given only when necessary.

In the following embodiments, a spherical projection display device that displays an image on a transmissive spherical screen will be described as an example of the spherical projection display device.

[First Embodiment]
FIG. 1 is a diagram schematically showing a configuration example of a spherical projection display device 1 according to the first embodiment of the present invention. The spherical projection display device 1 includes a spherical screen 2, a projection optical system unit 3, a backlight 4, a first film FL1 and a second film FL2.

The spherical screen 2 is a transmissive screen in which an inner surface forming a part of a spherical surface is used as a projection surface. In the spherical screen 2, for example, a material for diffusing light or a treatment for diffusing light is applied to one or both surfaces of the inside and the outside of the translucent member. As a result, the light diffusion property is secured. The spherical screen 2 may be made of any material that diffuses light.

The spherical screen 2 has an opening provided in a part of a hollow sphere. The opening has a size that allows at least light emitted from the projection optical system unit 3 to be described later to pass therethrough, and is determined according to an angle at which the light is emitted from the projection optical system unit 3 and a distance from the projection optical system unit 3. It The spherical screen 2 may be, for example, a hemispherical member. In addition, the spherical screen 2 has, for example, an opening provided on one side of a pair of hemispherical members forming a hollow sphere, and both hemispherical members are connected with a transparent adhesive or the like as far as possible. It may be formed by joining them invisible.

The projection optical system unit 3 includes a third lens L3, a fourth lens L4, a fifth lens L5, a case 31, and a support member 32. The lenses L3 to L5 will be described later with reference to FIG.

The case 31 has, for example, a cylindrical shape. In the present embodiment, the diameter of the cylinder of the case 31 changes at one location in the height direction (direction orthogonal to the radial direction). The diameter of the opening of the case 31 on the spherical screen 2 side is smaller than the diameter of the opening on the backlight 4 side.

The support member 32 is a plate-shaped member that is connected to (or is continuous with) the end portion of the case 31 on the backlight 4 side and extends in the radial direction of the opening of the case 31. The support member 32 may be fixed to a housing (not shown) or the outside, for example. The support member 32 is, for example, a member that guides the first film FL1 so that the first film FL1 and the second film FL2, which will be described later, are at predetermined positions with respect to the light emitted from the backlight 4.

The first film FL1 and the second film FL2 are arranged so as to overlap each other in the direction in which the light from the backlight 4 is emitted, the first film FL1 is arranged on the projection optical system unit 3 side, and the second film FL2 is arranged on the back side. It is located on the light 4 side.

The first film FL1 and the second film FL2 are formed of a material that transmits light. The first film FL1 and the second film FL2 may be, for example, hard plate-shaped members or sheet-shaped members. In the present embodiment, the first film FL1 and the second film FL2 are sheet-shaped members that can be easily deformed by gravity or the like, and different image information (pictures, characters, etc.) are printed or imaged. ..

The backlight 4 includes a light source unit 41 and a light source optical system unit 42.
The light source unit 41 includes a point light source (not shown). The light source optical system unit 42 includes a first lens L1 and a second lens L2 (shown in FIG. 2), and a fixed protrusion 43.

The point light source of the light source unit 41 is arranged so as to emit light toward the light source optical system unit 42. Although any light source can be used as the point light source, it is preferable to use a high-luminance LED (Light Emitting Diode) in consideration of downsizing, power saving, and durability of the spherical projection display device 1. It is preferable to use, for example, a high brightness white LED or a high brightness RGB-LED.

The fixed protrusion 43 has a screw hole penetrating in the direction in which the backlight 4 and the projection optical system unit 3 are arranged side by side, and projects from the light source optical system unit 42 in a direction substantially orthogonal to the screw hole. The fixing protrusion 43 is fixed to a housing (not shown) or the outside by a screw inserted into the screw hole.

FIG. 2 is a diagram for explaining an example of the projection optical system of the spherical projection display device shown in FIG.
Here, an example of the configuration of the first lens L1 to the fifth lens L5 included in the light source optical system unit 42 and the projection optical system unit 3 will be described.

The light source optical system including the first lens L1 and the second lens L2 emits light emitted from a point light source (not shown) to the second film FL2 and the first film FL1 in the state of parallel light or a state close to parallel light.

The third lens L3 to the fifth lens L5 form a projection optical system. The projection optical system directs light that has passed through the first film FL1 and the second film FL2, that is, projection light that projects an image printed or imaged on the first film FL1 and the second film FL2, to the spherical screen 2. And the image is projected onto the inner surface of the spherical screen 2. The projection optical system including the third lens L3 to the fifth lens L5 can be set to have a short focal length, and can project the image on a region beyond the hemisphere on the inner surface of the spherical screen 2. It is possible.

Further, in the projection optical system, for example, the lenses to be described later are used as the third lens L3 to the fifth lens L5, and a distortion correction function for optically compensating for image distortion on the inner surface of the spherical screen 2 is provided. Has been secured.

The first lens L1 is a plano-convex lens and the second lens L2 is a Fresnel lens. The third lens L3 is an asymmetric biconvex lens, the fourth lens L4 is a symmetric biconvex lens, and the fifth lens L5 is a meniscus lens having a convex surface in contact with the fourth lens L4. In the spherical projection display device 1, the specifications of the first lens L1 to the fifth lens L5 (radius of curvature on both surfaces of the lens (Radius), thickness of the lens (Thickness), radius of the lens (Semidiameter), etc.) are adjusted. It is possible to properly design the light trace of the entire optical system.

With the configuration of the spherical projection display device 1 described above, both the image of the first film FL1 and the image of the second film FL2 are projected on the inner surface of the spherical screen 2. Therefore, the observer visually recognizes the two overlapping images. Therefore, it is possible to present different images such as a character string and a flower image to the observer by the spherical projection display device 1. Here, for example, the image of the first film FL1 is used as the image for the right eye, the image of the second film FL2 is used as the image for the left eye, and the observer visually confirms using the glasses for the 3D image, and the spherical projection display device 1 is used. It becomes possible to perform stereoscopic display.

FIG. 3 is a diagram for explaining an example of a drive system of the spherical projection display device shown in FIG.
Here, a spherical projection display device 1 having a drive system for sliding the first film FL1 and the second film FL2 will be described. In this example, the first film FL1 and the second film FL2 are formed into a ring in which both ends of a sheet-shaped film are connected, and are arranged so as to surround the backlight 4.

The spherical projection display device 1 includes a film supporting member 5, a first film guiding member 6, a second film guiding member 7, brushes 8 and 9, and gears 10 and 11.

A plurality of film support members 5 are arranged inside the looped second film FL2, and support the first film FL1 and the second film FL2 from the backlight 4 side. In the plurality of film supporting members 5, the first film FL1 and the second film FL2 are horizontally aligned between the projection optical system unit 3 and the backlight 4 in a state where the first film FL1 and the second film FL2 overlap each other. It is positioned so as to slide (in a direction substantially orthogonal to the light emitted from the backlight 4), and is fixed to a housing (not shown) or the outside.

The first film guiding member 6 and the second film guiding member 7 are positioned below the backlight 4 so that the first film FL1 and the second film FL2 are slidably slid at a distance from each other and are not shown. It is fixed to the case and the outside.

The first film guiding member 6 is arranged inside the first film FL1 that is a loop, in other words, between the first film FL1 and the second film FL2, and is fixed so as to contact the first film FL2. ing.

The second film FL2 is disposed inside the looped second film FL2, in other words, between the second film FL2 and the backlight 4, and is fixed so as to be in contact with the second film FL2.

The brushes 8 and 9 remove stains on the surfaces of the first film FL1 and the second film FL2 that are in contact with each other. The brushes 8 and 9 are grounded to remove static electricity charged on the first film FL1 and the second film FL2.

The gear 10 is arranged on the outer side of the first film FL1 that is a loop and rotates, for example, counterclockwise. The gear 11 is arranged inside the second film FL2 that is a loop and rotates, for example, clockwise.

FIG. 4 is a diagram for explaining an example of a film feeding mechanism of a drive system of the spherical projection display device shown in FIG.

The first film FL1 and the second film FL2 are provided with a plurality of openings HL into which the teeth of the gears 10 and 11 are inserted. The plurality of openings HL are arranged side by side in the direction D1, for example, at the ends of the first film FL1 and the second film FL2 in the direction substantially orthogonal to the feeding direction D1.

The gear 10 is arranged at a position where teeth are inserted into the opening HL on one side of an end portion of the first film FL1 in a direction substantially orthogonal to the feeding direction D1. The gear 11 is arranged at a position where teeth are inserted into the opening HL on one side of an end portion of the second film FL1 in a direction substantially orthogonal to the feeding direction D1.

As described above, in the spherical projection display device of this embodiment, the image is projected on the spherical screen 2 using the first film FL1 and the second film FL2. Therefore, unlike the case where a liquid crystal element is used, it is not necessary to use a polarizing plate, so that the light transmittance can be improved. Therefore, according to the spherical projection display device 1 of the present embodiment, it is possible to increase the brightness and color purity of the displayed image and improve the definition. That is, according to the present embodiment, it is possible to provide a spherical projection display device capable of high-definition display with high color purity and a driving method of the spherical projection display device. Further, as compared with the case where a liquid crystal element is used, the material such as the polarizing plate is unnecessary as described above, so that the spherical projection display device can be manufactured at low cost.

[Second Embodiment]
FIG. 5 is a diagram for explaining one configuration example of the spherical projection display device according to the second embodiment of the present invention.

The spherical projection display device 1 of the present embodiment is different from the above-described first embodiment in the arrangement position of the first film FL1 and the second film FL2. In the present embodiment, the first film FL1 and the second film FL2 are arranged between the projection optical system unit 3 and the backlight 4, and are arranged at intervals in the direction in which light is emitted from the backlight 4. ing.

As described above, by providing the space between the first film FL1 and the second film FL2, the image presented to the observer has a sense of perspective. That is, regarding the image visually recognized by the observer, the image of the first film FL1 arranged on the projection optical system unit 3 side becomes the near view, and the image of the second film FL2 arranged on the backlight 4 side becomes the distant view. Therefore, according to the spherical projection display device 1 of the present embodiment, it is possible to present an image with depth to the observer.

FIG. 6 is a diagram for explaining an example of a drive system of the spherical projection display device shown in FIG.
In this example, the film support member 5 of the spherical projection display device of the first embodiment is provided individually for each of the first film FL1 and the second film FL2. That is, in the present embodiment, the drive system includes the first film support member 51 and the second film support member 52.

A plurality of the first film support members 51 are arranged inside the first film FL1 that is a loop, in other words, between the first film FL1 and the second film FL2. The plurality of first film support members 51 are configured so that the first film FL1 slides horizontally between the projection optical system unit 3 and the backlight 4 (direction substantially orthogonal to the light emitted from the backlight 4). Is fixed to the housing and the outside (not shown).

A plurality of second film support members 52 are arranged inside the second film FL2 that is a loop, in other words, between the second film FL2 and the backlight 4. The plurality of second film support members 52 are arranged so that the second film FL2 slides horizontally between the projection optical system unit 3 and the backlight 4 (direction substantially orthogonal to the light emitted from the backlight 4). Is fixed to the housing and the outside (not shown).

The first film support member 51 and the second film support member 52 are arranged so that a predetermined space is created between the first film FL1 and the second film FL2. As described above, in the present embodiment, since the first film FL1 and the second film FL2 do not come into contact with each other when sliding, it is possible to suppress static electricity charged on the first film FL1 and the second film FL2. .. Therefore, in the spherical projection display device 1 of the present embodiment, the brush for removing static electricity may be omitted.

The spherical projection display device 1 of the present embodiment is the same as the above-described first embodiment except for the configuration described above. Therefore, according to the spherical projection display device 1 of the present embodiment, it is possible to obtain the same effect as that of the above-described first embodiment, and further it is possible to present an image with a depth to an observer.

In the above example, the gear 10 and the gear 11 were driven so that the first film FL1 and the second film FL2 were fed in the same direction, but the first film FL1 and the second film FL2 were mutually driven. It may be driven so as to be delivered in the opposite direction. Further, the speeds at which the first film FL1 and the second film FL2 are sent out do not have to be the same and may be different.

FIG. 7 is a diagram for explaining an example of a driving method of the spherical projection display device according to the first embodiment and the second embodiment of the present invention.

In this example, the backlight 4 is alternately turned on and off for a predetermined period. Further, the first film FL1 and the second film FL2 slide during the period when the backlight 4 is off, and stop during the period when the backlight 4 is on.

When the spherical projection display device 1 is driven as described above, the backlight 4 can be turned on when there are images on the first film FL1 and the second film FL2 in the direction in which light is emitted from the backlight 4. .. Therefore, the observer can clearly see the images of the first film FL1 and the second film FL2. Further, by driving the spherical projection display device 1 as described above, it is possible to display an image by frame-by-frame advance and perform a display imitating a moving image.

[Third Embodiment]
FIG. 8 is a diagram for explaining a configuration example of the spherical projection display device according to the third embodiment of the present invention.

The spherical projection display device 1 of the present embodiment changes the movement of the film by using a cam and an elastic body for the drive system.

The spherical projection display device 1 of the present embodiment includes a spherical screen 2, a projection optical system unit 3, a backlight 4, a first film FL1, a second film FL2, a fixed folder 12, an elastic body 13, The cam 14, the motor 15, and the gear 16 are provided. The spherical screen 2, the projection optical system unit 3, and the backlight 4 have the same configurations as those in the above-described first embodiment.

The first film FL1 and the second film FL2 are image information printed or imaged on a transmissive plate-shaped member. The first film FL1 and the second film FL2 are arranged such that their image information overlaps in the light emission direction of the backlight 4.

The fixed folder 12 limits the movable range of the first film FL1 and the second film FL2. The fixed folder 12 is arranged on the first film FL1 with a space between the fixed folder 12 and the first film FL1, and is fixed to a casing (not shown) or the outside. The fixed folder 12 is, for example, a plate-shaped member, and extends in a direction substantially orthogonal to the sliding direction of the first film FL1 on a plane parallel to the first film FL1.

One end of the elastic body 13 is fixed to a housing (not shown) or the outside, and presses one end of the first film FL1. In this embodiment, the elastic body 13 is a leaf spring. The elastic body 13 is not limited to the leaf spring, and may be a coil spring or rubber.

The cam 14 includes a disc and a rotary shaft. The disc of the cam 14 is, for example, a plate which is attached to a fixed rotating shaft and whose distance from the center to the circumference is not constant. The cam 14 is arranged so as to contact the other end of the first film FL1 and slides the first film FL1 periodically. The rotating shaft has a gear shape in a cross section orthogonal to its axial direction.

The motor 15 drives a gear 16 that meshes with the teeth of the rotating shaft of the cam 14. The motor 15 is supplied with positive and negative motor power and a step signal from the outside. The motor 15 is fixed to a casing (not shown) or the outside.

When the spherical projection display device 1 is driven, the first film FL1 slides between the cam 14 and the elastic body 13 in both directions according to the rotation angle of the rotation axis of the cam 14. Therefore, the vibrating image is projected on the spherical screen 2. As described above, according to the spherical projection display device 1 of the present embodiment, it is possible to represent, for example, an image in which the eyes are blinking and moving.
That is, according to the present embodiment, it is possible to obtain the same effect as that of the above-described first embodiment, and further it is possible to present moving image information to the observer.

[Fourth Embodiment]
FIG. 9 is a diagram for explaining one configuration example of the spherical projection display device according to the fourth embodiment of the present invention.

The spherical projection display device 1 of the present embodiment includes a spherical screen 2, a projection optical system unit 3, a backlight 4, a first film FL1, a second film FL2, and a drive system. The drive system includes a first rotary shaft 17, a first bearing 18, a first drive gear 19, a first motor 20, a first gear 21, a second rotary shaft 22, a second bearing 23, and a second bearing 23. The second drive gear 24, the second motor 25, and the second gear 26 are provided. The spherical screen 2, the projection optical system unit 3, and the backlight 4 have the same configurations as those in the above-described first embodiment.

The first film FL1 and the second film FL2 are images in which image information is printed or imaged on a transmissive disk-shaped member. The first film FL1 and the second film FL2 are partially inserted between the projection optical system unit 3 and the backlight 4 in a state where they overlap each other in the direction in which light is emitted from the backlight 4.

The first rotating shaft 17 is connected to the center of the disc-shaped first film FL1 at one end thereof. The first bearing 18 is fixed to a casing (not shown) or the outside and supports the periphery of the first rotating shaft 17. The first drive gear 19 is attached to the other end of the first rotating shaft 17, and has a gear-shaped cross section in a direction substantially orthogonal to the rotating shaft direction. The first motor 20 drives a gear 21 that meshes with the first drive gear 19. A positive/negative motor power source and a step signal are externally supplied to the first motor 20. The first motor 20 is fixed to a housing (not shown) or the outside.

The second rotating shaft 22 is connected to the center of the disc-shaped second film FL2 at one end thereof. The second bearing 23 is fixed to a housing (not shown) or the outside and supports the periphery of the second rotating shaft 22. The second drive gear 24 is attached to a central portion of the second rotating shaft 22 in the rotating shaft direction, and has a gear-shaped cross section in a direction substantially orthogonal to the rotating shaft direction. The second motor 25 drives a gear 26 that meshes with the second drive gear 24. A positive/negative motor power source and a step signal are externally supplied to the second motor 25. The second motor 25 is fixed to a casing (not shown) or the outside.

FIG. 10 is a diagram for explaining a configuration example of a cross section taken along line AA shown in FIG. 9.
In the spherical projection display device 1 of the present embodiment, the first film FL1 and the second film FL2 have the same rotation axis. The second rotating shaft 22 has a cylindrical shape, and the first rotating shaft 17 is inserted into the second rotating shaft 22. The second rotary shaft 22 and the second drive gear 24 are fixed by, for example, an adhesive.

By operating the drive system described above, the first film FL1 and the second film FL2 rotate, and are inserted between the projection optical system unit 3 and the backlight 4 in accordance with the rotation angle of each rotation axis. It is possible to change the position of the film and present different image information to the observer.

Further, by rotating the first film FL1 and the second film FL2 with different motors and gears, it is possible to prevent the films from being damaged.

That is, according to the spherical projection display device 1 of the present exemplary embodiment, it is possible to obtain the same effect as that of the first exemplary embodiment described above, and further it is possible to ensure high reliability.

The present invention is not limited to the above-described embodiment, and the constituent elements can be modified and embodied without departing from the scope of the invention. Furthermore, the above-described embodiments include inventions at various stages, and are realized by an appropriate combination of a plurality of constituent elements disclosed in one embodiment or an appropriate combination of constituent elements disclosed in different embodiments. Various inventions can be constructed. For example, even if some constituent elements are deleted from all the constituent elements disclosed in the embodiment, if the problem to be solved by the invention can be solved and the effect of the invention can be obtained, these constituent elements are deleted. The described embodiment can be extracted as an invention.

In addition, in the above-described first to fourth embodiments, the spherical projection display device that projects the image information of two films has been described, but the number of films is not limited to two, and three or more films are used. A plurality of films may be used.
Further, the same effect can be obtained by applying the backlight driving method in the first and second embodiments described above to the fourth embodiment. That is, the light source of the backlight is repeatedly turned on and off for a predetermined period, the film is rotated while the backlight is turned off, and the rotation of the film is stopped while the backlight is turned on, thereby providing a clearer image to the observer. Can be presented to.

DESCRIPTION OF SYMBOLS 1... Spherical projection display device, 2... Spherical screen, 3... Projection optical system unit, 4... Backlight, 5... Film supporting member, 6... Film guiding member, 7... Film guiding member, 8... Brush 9... Brush, 10 , 11... Gear, 12... Fixed folder, 13... Elastic body, 14... Cam, 15... Motor, 16... Gear, 17... First rotating shaft, 18... First bearing, 19... First drive gear, 20... DESCRIPTION OF SYMBOLS 1 motor, 21... Gear, 22... 2nd rotating shaft, 23... 2nd bearing, 24... 2nd drive gear, 25... 2nd motor, 26... Gear, 31... Case, 32... Support member, 41... Light source ( Light source part), 42... Light source optical system unit, 43... Fixed protrusion, 51... Film support member, 52... Film support member, FL1... Second film, FL2... Second film, L1-L5... Lens.

Claims (4)

A spherical screen having an inner surface forming a part of the spherical surface as a projection surface,
A light source,
A light source optical system unit for emitting light from the light source as parallel light,
A projection optical system unit for compensating the parallel light emitted from the light source optical system unit and emitting the light toward the spherical screen;
At least a part is arranged between the light source optical system unit and the projection optical system unit, a plurality of transmissive films having image information,
Equipped with,
The plurality of films are arranged with a predetermined distance in a direction in which parallel light is emitted from the light source optical system unit,
The plurality of films includes at least one plate-shaped first film,
A cam which is in contact with one end of the first film and is rotated by a rotation shaft driven by a motor;
An elastic body that presses the other end of the first film,
The cam includes a disc mounted on the rotating shaft and having a constant distance from the position attached to the rotating shaft to the circumference, and contacts one end of the first film at the circumference of the disc.
A spherical projection display device that slides the first film bidirectionally between the cam and the elastic body by rotating the disk. A space is provided between the first film and the first film, and the first film is arranged so as to extend in a direction substantially orthogonal to the sliding direction of the first film on a plane parallel to the first film. The spherical projection display device according to claim 1, further comprising a fixed folder that limits a movable range of the film. A spherical screen having an inner surface forming a part of the spherical surface as a projection surface,
A light source,
A light source optical system unit for emitting light from the light source as parallel light,
A projection optical system unit for compensating the parallel light emitted from the light source optical system unit and emitting the light toward the spherical screen;
At least a part is arranged between the light source optical system unit and the projection optical system unit, a plurality of transmissive films having image information,
Equipped with,
The plurality of films are a first film that is a transmissive disc that is rotationally driven by a first motor, and a second film that is a transmissive disc that is rotationally driven by a second motor different from the first motor. preparative wherein said first film and said second independently obtained is rotated to the film, the spherical projection display apparatus rotation axis is common between the first film and the second film. A first rotation shaft connected at one end to the center of the first film;
A second rotating shaft connected at one end to the center of the second film;
The spherical projection display device according to claim 3, wherein the second rotation shaft has a cylindrical shape, and the first rotation shaft is inserted into the second rotation shaft.