JP2005201955A - Projector of planetarium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the projector of a planetarium controlling the degree of twinkle of stars and creating natural twinkling videos even when used for a star field including the Milky Way. <P>SOLUTION: The fixed star projection cylinder 10 of the planetarium is so constituted that: the light from a light source is guided by a light guide 15 composed of a bunch of optical fibers 14 and made incident on a condenser lens 13 through a relay lens 16; the light passing through a fixed-star original plate 11 provided with transmission holes corresponding to the image of fixed-stars in the star field is projected, as the image of stars, through a projection lens 12 on a screen. Further, a twinkle base plate 20 having light shielding patterns whose light shielding property differs depending on the position is arranged in the optical path of the fixed-star projection cylinder 10, and the twinkle base plate 20 is made to reciprocally rotate by a motor 21 fixed to the center. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a planetarium star projector. More specifically, the present invention relates to a planetarium projector that causes a blinking phenomenon in a star projection image.

  Various attempts have been made in the past to reproduce blinks in the same way as the actual starry sky in a star projection image from a planetarium star projector. For example, there is a projector that reproduces a blink by covering a light bulb of a light source with a hook-shaped light shield and rotating the light shield. Further, a light-blocking piece that covers the light bulb of the light source is flipped upward (see, for example, Patent Document 1), or a light-shielding piece disposed on the optical path is stopped outside the optical path (for example, Patent Document 2). For example, a projector that can stop blinking depending on the situation has been devised.

On the other hand, in recent years, a star projector has been commercialized in which a light guide such as an optical fiber bundle is inserted between the light source and the star base plate to increase the energy transfer efficiency. In such a star projector, a method has been devised in which a net-like light shield or iris diaphragm-shaped light control device is provided between the light source and the light guide, and blinking or light control is performed by driving them. (For example, refer to Patent Document 3).
JP 50-15410 A JP 49-40653 A Japanese Patent Laid-Open No. 2001-109063 (page 4, FIGS. 4-6)

  However, in the above-described conventional planetarium projector, the blink level is uniquely determined from the arrangement and shape of the light shield. Therefore, since the blink level cannot be controlled within the projection range of one light source, there is a problem that it is very difficult to reproduce a natural blink. In the past, the Milky Way was projected using pictures and photographs from the Milky Way projector, which is different from the star projector, but in recent years, the method has become more realistic. In other words, each star constituting the Milky Way is processed as a point on the star base plate based on its position data. By projecting this with a general star projector, the part where many star images gathered can be seen as the Milky Way. However, when a conventional light shield is used in the Milky Way area projected in this way, the shape of the light shield is recognized as a shadow, resulting in an unnatural projection image.

  The present invention has been made to solve the problems of the conventional planetarium projector described above. In other words, the problem is to provide a planetarium projector that can control the degree of blinking and that produces natural blinking images even when used in Hoshino including the Milky Way.

  The planetarium projector of the present invention, which has been made for the purpose of solving this problem, is a planetarium projector that projects a star image of a Hoshino original plate on a screen and has a light-blocking pattern that has different light-blocking properties depending on the location. (Toggle) The star image on the screen is blinked by placing the substrate in the optical path and moving the blinking substrate in the in-plane direction.

  According to the planetarium projector of the present invention, the blinking substrate having the light shielding pattern is arranged in the optical path for projecting the star image on the screen, so that the projection light is partially blocked by the light shielding pattern. Further, if the blinking substrate is moved in the in-plane direction, the arrangement of the light shielding pattern changes with the movement, so that the position where the projection light is blocked can be changed. In other words, the light-shielding state at each position changes with time, which appears as a blink of a star image projected on the screen. According to this projector, it is possible to provide a planetarium projector capable of controlling the degree of blinking by adjusting the arrangement and movement speed of the light shielding pattern. Furthermore, if the shading pattern is different depending on the location, the shading pattern in the Milky Way area is less noticeable by making the shading pattern corresponding to the area where the Milky Way is projected on the Hoshino original plate low. can do. Therefore, it can be a planetarium projector that produces a natural blink image even when used in Hoshino including the Milky Way.

The present invention also provides a planetarium projector that projects a star image of a Hoshino original plate on a screen, a blinking substrate having a light shielding pattern that is arranged in the optical path and having different light shielding properties depending on the location, and the blinking substrate on the plane. It may have a moving means for moving in the direction.
If it is such, the blinking board | substrate which has the light-shielding pattern from which light-shielding property changes with places can be arrange | positioned in an optical path, and can be moved to the board surface inside direction.

Furthermore, the present invention has a control means for controlling the moving means, and the blinking substrate is provided with a blinking region having a light shielding pattern, and the control means is configured so that the blinking substrate is in a state where the blinking region is located in the optical path. It is desirable to realize a blink mode that moves and a blink stop mode in which the blink region is retracted from the optical path.
In this way, in the blink mode, the shading pattern moves in the optical path, so that the star image appears blinking. On the other hand, in the blink stop mode in which the blink area is retracted from the optical path, the light-shielding pattern is not in the optical path, and the star image is not shielded, so it does not blink. Therefore, blinking can be stopped.

Furthermore, in the present invention, it is desirable that a weak blink region having a light-shielding contrast that is weaker than other portions in the blink region is provided in the blink region.
In this way, even when a general stellar image and the Milky Way region are mixed in the same Hoshino original plate, a portion corresponding to the Milky Way region can be set as a weak blink region. Therefore, even if it is used in Hoshino including the Milky Way, it can be a natural blink image.

Furthermore, in the present invention, it is desirable to have a position information sensor for detecting information related to the movement position of the blinking substrate in the plate surface, and the blinking substrate is preferably provided with a position information mark that is read by the position information sensor.
In this way, since the position of the blinking substrate moving in the plate surface can be determined, an appropriate position can be placed on the projection optical path of Hoshino.

Further, in the present invention, it is desirable that the blinking substrate is disposed adjacent to the Hoshino original plate or at a position optically conjugate with the position of the Hoshino original plate.
In this way, the blinking substrate can be arranged on the projection optical path of the Hoshino original plate.

  According to the planetarium projector of the present invention, the degree of blinking can be controlled, and a natural blinking image can be obtained even when used in a star field including the Milky Way.

"First form"
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, each star projection tube is used by being attached to a planetarium star projection device. In general, in a planetarium star projection device, a plurality of (for example, 32) star projection tubes are attached to the base star sphere, and each star projection tube displays a star projection image in the range of the star base plate (hoshino base plate). To be projected.

  As shown in FIG. 1, the star projection cylinder 10 of this embodiment has a star original plate 11 provided with a transmission hole corresponding to each star, and a projection lens 12, a condenser lens (condensing lens) 13, and the like before and after that. Is arranged. Light from a light source such as a halogen lamp or a metal halide lamp is guided to the star projection cylinder 10 by a light guide 15 formed of a bundle of optical fibers 14. Further, the light that is incident on the condenser lens 13 through the relay lens 16 and passes through the transmission hole of the stellar original plate 11 is projected on the screen by the projection lens 12.

  Further, in the star projection cylinder 10 of this embodiment, a blinking substrate 20 is provided between the light guide 15 and the relay lens 16. This position is optically conjugate with the stellar original plate 11. In this case, it is not always necessary to strictly arrange at the conjugate point, as long as it is within a position range where the effect as the blinking substrate 20 can be exhibited. Specifically, the range of (distance between the star original plate 11 and the relay lens 16) / magnification × (0.5 to 1.5) is set as the range of “conjugate position” here. The blinking substrate 20 has a substantially disk shape, and is rotatable by a motor 21 attached to the central axis thereof. Further, a photo sensor 22 for detecting the rotation angle of the blinking substrate 20 is provided along the edge of the blinking substrate 20. In addition to these, a controller 23 for controlling the motor 21 and the photosensor 22 and a power supply 24 for supplying a power supply voltage thereto are provided.

  Next, the blinking substrate 20 will be described. As shown in FIG. 2, the blinking substrate 20 is provided with a hole 32 for attaching the shaft of the motor 21 to the center of a disk-shaped substrate 31. The substrate 31 is made of a transparent material such as quartz glass, and a large number of light shields 33 are formed on the surface thereof. As a result, a shading pattern is formed. The light shielding element 33 is an aluminum foil film formed by aluminum vapor deposition and thin film photoetching. The substrate 31 is divided into a light shielding portion 31a having a central angle of about 270 degrees and a non-light shielding portion 31b having the same angle of about 90 degrees. A large number of light shielding elements 33 are formed on the light shielding portion 31a. The light shielding portion 31b is not provided with the light shielding element 33 at all.

  The blinking substrate 20 is provided with a light shielding edge 34 along the outer edge thereof. The light shielding edge 34 is also formed in a band shape by aluminum vapor deposition similar to the light shielding element 33. A notch 35 is provided in the light shielding edge 34 at a position facing the non-light shielding portion 31b. The position of the light shielding edge 34 corresponds to the position detected by the photosensor 22 as shown in FIG. That is, by detecting the notch 35 with the photosensor 22, it can be determined that the blinking substrate 20 is at a predetermined rotational position.

  Here, since the photosensor 22 is provided at a position opposed to the projection light path and the notch 35 is provided at a position opposed to the non-light-shielding portion 31b, when the notch 35 is detected by the photosensor 22, it is within the projection light path. The non-light-shielding portion 31b is located. Here, a region 36 indicated by a broken line in FIG. 2 has a size corresponding to the projection range of the star original plate 11 at the time of projection. That is, the range of the non-light-shielding portion 31b is determined so that the entire projection range of the star original plate 11 is included therein.

  When the star projection image is blinked by the star projection cylinder 10, the motor 21 is controlled by the controller 23 to reciprocate and rotate the blinking substrate 20 within a range where the light shielding portion 31 a is disposed in the projection light path. For example, the rotation angle may be reciprocated within a range of about −90 ° to + 90 ° with the position in FIG. 2 as the center. As a result, light from the light source is blocked in some places by the light shielding element 33, so that the star projection image appears to blink randomly. This is the blink mode.

  Alternatively, when the blinking of the star projection image is stopped, the controller 23 determines the position of the notch 35 from the detection signal of the photosensor 22, and the rotation of the motor 21 is stopped at that position. Thereby, since the non-light-shielding part 31b is located in the projection optical path, the star projection image stops blinking. This is the blink stop mode.

  The degree of blinking of the star projection image by the star projection cylinder 10 varies depending on the arrangement, shape, size, transmittance, etc. of the light shield 33 of the blinking substrate 20. The shape of the light shield 33 can be selected during thin film photoetching. For example, in addition to a circle, a shade 33 such as a polygon, a star, or a sea urchin type having a plurality of spines around the circle can be used. Alternatively, a continuous shading element 33 such as a mesh pattern or a radiation pattern may be used.

  Further, the transmittance of the light shielding element 33 can be adjusted to some extent by the thickness of the deposited film during aluminum deposition. For example, if the transmittance of the light shielding element 33 is 0%, the star projection image at the position shaded by the light shielding element 33 disappears completely. However, when the light shielding element 33 having a transmittance of about 50% is used, The projected image only reduces its brightness by half. Further, the blinking time interval of the star projection image can be adjusted according to the relationship between the size and distribution of the light shielding element 33 and the rotation speed of the blinking substrate 20. Therefore, according to the star projection 10 or the like, the star projection image can be blinked with an appropriate degree of blinking by selecting the blinking substrate 20 and adjusting the rotation speed.

  By the way, as described above, in recent years, the Milky Way has been formed as a transmission hole for each star in the star base plate 11 like a general star. Therefore, if the blinking substrate 20 including the large light shielding element 33 is used for the star original plate 11 including the Milky Way region, the moving path of the light shielding element 33 may appear as a shadow on the screen. Therefore, it is assumed that the blinking substrate 20 used for the stellar original plate 11 including the Milky Way changes the size or transmittance of the light shielding element 33 depending on the portion as shown in FIG.

  Here, a region 36 indicated by a broken line in FIG. 3 is a range corresponding to the projection range of the star original plate 11 including the Milky Way region 37 in the blink mode. In general, the Milky Way region 37 is set so as to be located at the end of the star original plate 11. In this figure, the upper part of the boundary line having a complicated curved shape is the Milky Way region 37. Thus, the Milky Way region 37 is included in a part of the projection range of the star original plate 11, and the stars are densely gathered in the Milky Way region 37. In the star projection cylinder 10 to which the star original plate 11 is attached, when the blinking substrate 20 is reciprocally rotated to blink the star projection image, the range through which the Milky Way region 37 passes is the arc indicated by the one-dot chain line in FIG. It is the outer Milky Way area 31c, and the Milky Way area 37 does not pass through the other area 31d.

  Therefore, in the blinking substrate 20 used for the stellar original plate 11 having the Milky Way region 37, as shown in FIG. 3, the overall light shielding property of the Milky Way range 31c is made smaller than that of the other range 31d. For example, the light shielding element 33c formed in the Milky Way range 31c has a smaller size or a higher transmittance than the light shielding element 33d formed in the other range 31d. For example, in the example of FIG. 3, the light shield 33c disposed in the Milky Way range 31c has a diameter of 0.3 mm and a transmittance of 50%, and the light shield 33d disposed in the other range 31d has a diameter of 0. .6 mm transmittance 0%.

  That is, for the stellar original plate 11 including the Milky Way region 37, the blinking substrate 20 having a light shielding property as a whole of the Milky Way range 31c is used. As a result, even if the star projection tube 10 is used to project Hoshino including the Milky Way, the shadow of the light shielding element 33c does not stand out. Therefore, the star projection tube 10 is capable of reproducing natural blinks even when used in a star field including the Milky Way.

  Here, if the light shielding element 33 of the blinking substrate 20 is arranged almost uniformly at the light shielding portion 31a as shown in FIG. 2, the speed at which the light shielding element 33 passes between the center side and the outer peripheral side of the blinking substrate 20 is somewhat higher. Differences occur. Therefore, in the star original plate 11, there is a possibility that the projected image blinks slightly different between the star arranged at the lower side in FIG. 1 and the star arranged at the upper side in FIG. In order to correct this point, the light shielding elements 33 may be arranged roughly on the inner side and densely on the outer side so that the same light shielding time is obtained at the same rotation angle. Alternatively, the size of the light shield 33 may be changed between the inside and the outside.

  As described above in detail, according to the star projection cylinder 10 of the present embodiment, the blinking substrate 20 is disposed on the optical path between the light guide 15 and the relay lens 16 and is rotated by the motor 21. Further, the blinking substrate 20 is provided with a light shielding portion 31a in which a large number of light shielding elements 33 are formed and a non-light shielding portion 31b in which the light shielding elements 33 are not formed. Therefore, blinking can be performed on the star projection image by reciprocatingly rotating the light shielding portion 31a on the optical path, and blinking can be stopped on the star projection image by stopping the non-shielding portion 31b on the optical path. . Furthermore, the degree of blinking can be adjusted by selecting the shape, size, transmittance, etc. of the light shield 33 provided in the light shielding portion 31a. Therefore, in the Milky Way region 31c corresponding to the Milky Way region 37, the shadow can be made inconspicuous by reducing the size of the light shielding element 33c or increasing the transmittance. This makes it possible to control the degree of blinking, and is a planetarium projector that produces natural blinking images even when used in Hoshino including the Milky Way.

"Second form"
Hereinafter, a second embodiment of the present invention will be described in detail with reference to the accompanying drawings. This embodiment is a blinking device used for a planetarium star projector.

  As shown in FIG. 4, the star projection tube 40 of this embodiment includes a dedicated light source 41 instead of introducing light from the light source through the optical fiber 14. In this embodiment, the blinking substrate 42 is provided adjacent to the stellar original plate 11 between the stellar original plate 11 and the projection lens 12. Except for these points, the configuration is the same as that of the stellar projection cylinder 10 of the first embodiment, and the same reference numerals are given and description thereof is omitted.

  The blinking substrate 42 of the star projection cylinder 40 of this embodiment is the same as the blinking substrate 20 of the first embodiment. What corresponds to the star original plate 11 including the Milky Way region 37 is configured similarly to the blinking substrate 20 of FIG. That is, in the portion corresponding to the Milky Way region 37, a small light shielding element 33 or a light shielding element 33 having a high transmittance may be disposed.

  As described above in detail, the stellar projection tube 40 that does not use an optical fiber can control the degree of blinking as well as the star projection tube 10 of the first embodiment, and can be used for a star field including the Milky Way. However, it is a planetarium projector that produces natural blink images.

Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof.
For example, in the blinking substrates 20 and 42 of the above-described forms, the notch 35 is provided at a position facing the non-light-shielding portion 31b. It may be arranged so that can be detected, and not necessarily at this position.

Further, for example, the arrangement of the blinking substrates 20 and 42 in the above-described form may be optically conjugate with the stellar original plate 11. That is, the blinking substrate 20 of the star projection cylinder 10 is provided adjacent to the star original plate 11 like the star projection cylinder 40, or the blink substrate 42 of the star projection cylinder 40 is arranged as the light source 41 and the condenser like the star projection cylinder 10. It may be provided on the optical path between the lens 13.
Further, for example, the non-light-shielding portion 31b is a transparent portion where the light-shielding element 33 is not provided. However, the blinking substrates 20 and 42 obtained by cutting this portion may be used.
Further, for example, in each of the above embodiments, the light shielding edge 34 is provided on the outer edge portion of the blinking substrates 20 and 42, and the cutout 35 is detected by the photosensor 22 to determine the non-light shielding portion 31b. On the other hand, as shown in FIG. 5, it is good also as the blink board | substrate 50 which provided the large hole 51 in the center and provided the light-shielding edge 52 in the periphery. Furthermore, if the non-light-shielding part 31b is formed by cutting off at the straight line 53, a part of the light-shielding edge 52 is cut off. The rotation angle of the blinking substrate 50 may be determined by detecting this portion from the inside of the large hole 51 with a photo sensor or the like.

For example, the moving method of the blinking substrates 20 and 42 is not limited to rotation, and may be linear reciprocation. In that case, the blinking substrates 20 and 42 need not be circular, but may be rectangular, oval, or the like.
For example, if the blinking is not stopped, the blinking substrates 20 and 42 may be provided with the light shielding element 33 provided on the entire surface without providing the non-light shielding portion 31b. In that case, it is good also as continuous rotation instead of reciprocating rotation.

It is sectional drawing which shows the star projection cylinder which concerns on a 1st form. It is explanatory drawing which shows a blink board | substrate. It is explanatory drawing which shows a blink board | substrate. It is sectional drawing which shows the star projection cylinder which concerns on a 2nd form. It is explanatory drawing which shows the blink board | substrate of another form.

Explanation of symbols

10, 40 Stellar projection tube (projector)
11 Stellar original plate (Hoshino original plate)
20, 42 Blink substrate 21 Motor (moving means)
22 Photosensor (position information sensor)
23 Controller (control means)
31a Shading part (blink area)
31c Milky Way range (weak blinking region)
33 Shading element (shading pattern)
34 Shading edge (position information mark)
35 Notch (position information mark)

Claims (6)

In the planetarium projector that projects the star image of Hoshino original plate on the screen,
Projection of a planetarium characterized by placing a blinking substrate with a light-shielding pattern with different light-shielding properties depending on the location in the light path and moving the blinking substrate in the direction of the plate to blink the star image on the screen Machine. In a planetarium projector that projects the star image of the Hoshino original plate on the screen,
A blinking substrate having a light shielding pattern arranged in the optical path and having different light shielding properties depending on the location;
A planetarium projector, comprising: moving means for moving the blinking substrate in an in-plane direction. The planetarium projector according to claim 2,
Control means for controlling the moving means;
The blinking substrate is provided with a blinking region having a light shielding pattern,
The control means includes
A blink mode in which the blink substrate moves in a state where the blink region is located in the optical path;
A planetarium projector characterized by realizing a blink stop mode in which the blink region is retracted from an optical path. In the planetarium projector according to claim 3,
A planetarium projector, characterized in that a weak blink area is provided in the blink area. The weak blink area has a lower light-shielding contrast than other parts in the blink area. In the planetarium projector according to claim 3 or 4,
A position information sensor for detecting information on the movement position of the blinking substrate in the plate surface;
A planetarium projector, wherein the blinking substrate is provided with a position information mark which is read by the position information sensor. In the planetarium projector according to any one of claims 2 to 5,
The planetarium projector, wherein the blinking substrate is disposed adjacent to the Hoshino original plate or at a position optically conjugate with the position of the Hoshino original plate.

Images