JP3787249B2 - Planetarium star projector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a planetarium star projector, and more particularly to a star projector that guides light using an optical fiber.
[0002]
[Prior art]
Attempts have been made to effectively utilize light energy by guiding light from a light source using an optical fiber in a planetarium. In particular, a technique for guiding and guiding light from a light source to a number of stellar projection tubes by an optical fiber is already known.
[0003]
Japanese Patent No. 2632438 mentions the use of optical fiber as one means for preventing the optical axis of each star projection tube from concentrating at one point when the purpose is to reduce the size of the planetarium.
[0004]
Furthermore, in a planetarium using an optical fiber, the light from the light source collected by the condenser lens is made incident on the converging part of the optical fiber bundle, and the opposite side is divided into a plurality of optical fibers. A projector that achieves prevention of temperature rise and image brightness improvement by connecting it to the opening of the original plate has already been commercialized by Carl Zeiss Jena.
[0005]
[Problems to be solved by the invention]
However, the planetarium star projector using the optical fiber as described above has the following two problems.
[0006]
One of them is that when light is supplied from a light source to a large number of star projection cylinders using an optical fiber, in order to increase the gradation of each star to the actual starry sky, an attempt is made to increase the brightness of a high-grade star projection image. It is necessary to increase the power of the light source considerably, and as a result, the temperature rise of the star projector is promoted. Conversely, if the lack of light source power is compensated by increasing the hole diameter of the projection original plate, the projected image diameter on the screen increases by the ratio of the original plate hole diameter increased, and the projected image is not a dot but a round star. As a result, it becomes a starry sky production that is different from the actual.
[0007]
The other is that the light from the light source collected by the condenser lens is made incident on the converging part of the optical fiber bundle, and the opposite side is divided into a plurality of parts, and each optical fiber is made into the opening of the stellar original plate. When connecting, since there are as many star openings as the number of stars projected on the whole sky, it is difficult to perform assembly work and repair work when the connection with the optical fiber master is disconnected.
[0008]
An object of the present invention is a planetarium that does not increase the power of the light source, suppresses the temperature rise, maintains the visual diameter at which the projected image can be seen as a dot, increases the image brightness of a higher-grade star, and is easy to assemble and repair. Is to provide a stellar projector.
[0009]
In order to achieve the above-described object, the planetarium star projector of the present invention projects a predetermined brilliant star from a brilliant star projection cylinder among the stars to be projected, and stars other than the predetermined brilliant star are projected. A planetarium star projector projected from a star projection tube, which is composed of a plurality of high star star tubes and a high star star projection lens, and a star that projects more stars. to the original plate and the focusing lens and the fixed star projection lens movies plurality stellar projection that is configured with a tubular, light from the light source to guide Kuno by an optical fiber or optical fiber bundle branching individually from the light source, distribute The light energy is characterized in that the high star projection tube side is lower than the star projection tube side .
[0010]
In such a configuration, the high sky star projection tube shares only a small number of higher-grade stars, and other stars in the whole sky are projected by the star projection tube. Compared to the projection angle of a star projection tube that will be projected in a long time, the projection angle of a high brightness star projection tube that projects only a small number of higher-grade stars will be much smaller, and the light energy required for high brightness star projection will be reduced. The light energy required for the star projection tube is greatly reduced, and the distribution of light energy from the light source to each star projection tube and each high-brightness star projection tube according to the ratio of the projection angle is individually branched from the light source. Satisfied by light guiding using an optical fiber or a bundle of optical fibers, the brightness of the bright star projection image can be sufficiently increased without increasing the power of the light source or enlarging the transmission hole of the bright star original plate. Therefore, it is possible to produce an effect based on the visual diameter in which all the stars including high brightness stars are recognized as points, and the problem of temperature rise caused by increasing the power of the light source is solved. Further, since the optical fiber is simply connected to each star projection tube and the high brightness star projection tube, the assembly work and the repair work when the optical fiber is disconnected are easy.
[0011]
In this case, the high brightness star plate expresses one or a suitable number of high brightness stars, and the star base plate expresses the projected image of the number of stars divided by the number of star projection tubes from the stars excluding those high brightness stars. It is suitable for exhibiting the above characteristics.
[0012]
When a light shield that moves while shielding a part of the end face of the converging part is provided between the converging part on the light source side of the optical fiber or optical fiber bundle and the light source, a part that does not transmit the light of the light shield that falls on the end face of the converging part By moving the shadow, the blinking effect of blinking the projected image can be exhibited.
[0013]
A dimming means that changes the aperture of the diaphragm by a signal from the outside of the projector and changes the amount of light irradiated from the light source to the converging unit between the converging unit on the light source side of the optical fiber or the optical fiber bundle and the light source. If provided, the light can be adjusted mechanically, and this is suitable when electrical light control cannot be performed depending on the type of light source.
[0014]
By installing a light shield near the front and rear of the projection lens of each shining star projection tube so that the light from each shining star projection tube can be shielded independently, projection of the shining star in each shining star projection tube is stopped. Can be controlled individually, which is convenient for production.
[0015]
In each of the above cases, the star projection master plate of the star projection tube can be constituted by a liquid crystal master plate that allows light to pass through only the liquid crystal portion to which voltage is applied, and only by controlling the position of the liquid crystal to which the voltage is applied, The position and number of stars to be projected can be freely controlled.
[0016]
Further objects and features of the present invention will become apparent from the following detailed description and drawings. Each feature of the present invention can be used alone or in combination in various combinations as much as possible.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Below typical embodiment of planetarium stellar throw shadows machine of the present invention, described in detail and with reference to FIGS. 1 to 6 together with its embodiments, provided for understanding of the present invention.
[0018]
This embodiment is an example when the present invention is applied to a planetarium star projector as shown in FIG. 1, and the optical axis is set to the center of the star sphere 1 in the star sphere 1 serving as the base of the star projector. The required number of stellar projection tubes 2 is fixed in the direction of heading. The required number of star projection tubes 2 is generally 32. Further, a light source 3 such as a halogen lamp with a reflector or a metal halide lamp with a reflector, and a bright star projection cylinder 4 are attached using a portion of the stellar sphere 1 to which the star projection cylinder 2 is not attached.
[0019]
In the first embodiment shown in FIGS. 1 to 3, the high-brightness star projection cylinder 4 can rotate the spherical surface portion 4 a of its trunk to a seat 22 in the stellar sphere 1 as shown in FIGS. 1 and 3. And has a certain width in the projection direction. A converging unit 5a in which a number of optical fibers 5 necessary for projection on the stellar sphere 1 are bundled is connected to a projection port 3a facing the inside of the stellar sphere 1 shown in FIG. The converging part 5a on the light source 3 side is individually branched as shown in FIG. 1 so as to guide the light from the light source 3 to each of the fixed star projection cylinders 2 and each of the high brightness star projection cylinders 4, and the branched tips correspond respectively. Each star projection cylinder 2 and each high brightness star projection cylinder 4 are connected.
[0020]
As shown in FIG. 2, the stellar projection tube 2 has a condensing lens 6 and a projection lens 7 on the back and front of the stellar original plate 8, and the tip of the branch optical fiber 5 condenses on the back of the condensing lens 6. On the optical axis of the lens 6, it is connected to a position where the light from the optical fiber 5 can be effectively taken into the condenser lens 6. A number of transmission holes representing stars, for example, about 300 to 800 are opened on the star original plate 8 to be projected.
[0021]
As shown in FIG. 3, the high-bright star projection cylinder 4 is provided with a projection lens 9 at the front end, and the branching tip of the optical fiber 5 is connected to the rear portion. A high-gloss star plate 10 is attached to the tip of the connected optical fiber 5. The brilliant star base plate 10 has one transmission hole representing a brilliant star, and the optical fiber 5 is positioned so that the center of the transmission hole is on the optical axis 21 of the projection lens 9 and near the focal position of the projection lens 9. Is connected to the high brightness star projection tube 4.
[0022]
Here, for example, if the projection half angle of view from the star projection cylinder 2 is about 28 ° and the projection half angle of view from the high brightness star projection cylinder 4 is 0.05 °, the projected area ratio is the square of the radius. It is about 370,000 times better. In other words, when equal light energy is applied to the star projection tube 2 and the high-brightness star projection tube 4, the brightness of the high-brightness star projection image by the high-brightness star projection tube 4 is about 37 of the star projection image in the star projection tube 2. Million times.
[0023]
However, even if high brightness stars are projected, the brightness ratio up to that point is not necessary. Therefore, as an example, the optical fiber 5 guided from the light source 3 to the high brightness star projection tube 4 is made as a single strand having a diameter of 50 μm. When the optical fiber 5 that guides light from the light source 3 to the projection tube 2 is bundled with a diameter of 5 mm, and the cross-sectional area of the light guide path or the area ratio of the light guide surface is reduced to about 10,000 times, The brightness ratio of each projected image is about 37 times, and it is still possible to obtain the brightness ratio of about 3.9 stars.
[0024]
In this way, the light from the light source 3 is guided by diverging from the focusing unit 5a so that the high luminous star projection cylinder 4 can obtain the minimum light energy necessary for projecting one high-grade high-luminance star. Considering the number of distributions of the optical fibers 5 that emit light, the brightness of the bright star projection image can be sufficiently increased without increasing the power of the light source 3 or increasing the transmission hole of the bright star original plate 10. Therefore, it is possible to produce an effect based on the visual diameter in which all the stars including high brightness stars are recognized as points, and the problem of temperature rise caused by increasing the power of the light source 3 is solved. At the same time, since the optical fiber 5 is only connected to each star projection cylinder 2 and the high-brightness star projection cylinder 4, the assembling work and the repair work when the optical fiber 5 is disconnected are simple.
[0025]
Such a feature is that the high-luminance star projection tube 4 projects only high-ranking stars, and the other star in the whole sky is projected by the star projection tube 2, so that the whole sky is divided into a plurality of stars. Projection angle in the high star projection tube 4 that projects only a few upper-grade stars is much smaller than the projection angle in the star projection tube 2 that will be divided and projected, and is necessary for high brightness star projection Light energy from the light source 3 to each star projection tube 2 and each high-brightness star projection tube 4 according to the ratio of projection angles is greatly reduced with respect to the light energy required for the star projection tube 2 This is because the optical fiber 5 or the bundle of optical fibers 5 branched individually from the light source 3 can be satisfied by the light guide. Therefore, it is preferable to project one high-luminance star with one high-luminance star projection tube 4, but the present invention is not limited to this. If the number of stars projected by one star-projection tube 2 is much smaller, it is preferable. The advantages of the above features are exhibited.
[0026]
In the second embodiment shown in FIG. 4, the light source unit further enables blinking of the projected image projected by the star projection cylinder 2 and the high-brightness star projection cylinder 4 in the first embodiment. Such blinking is achieved by the movement of the net-shaped light shield 11 in which there are randomly transmitting portions and non-transmitting portions. The light shield 11 is disposed between the collected light beam 5 a on the light source 3 side and the light source 3, and is fixed to a swing rod 12 b supported on the rotary shaft 12 a of the actuator 12 attached to the unit of the light source 3. The opaque portion of the light shield 11 casts a shadow on the light source 3 side end face of the converging part 5a of the optical fiber 5, and the shadow moves by the action of the actuator 12 according to the swing of the swing rod 12b. It blinks randomly, and it looks as if the eyelids are blinking. Further, if the light shield 11 is retracted to a side position where no shadow is cast on the end face on the light source 3 side of the converging part 5a of the optical fiber 5, blinking of the projected image can be stopped.
[0027]
Further, when a discharge lamp such as a metal halide lamp is used as the light source 3, the lamp cannot be electrically dimmed. For this reason, a mechanical light control device is required. FIG. 5 shows a light source unit capable of mechanical light control as a third embodiment. Dimming can be performed by changing the aperture diameter of the stop, and it is preferable to use a so-called iris stop in terms of performing delicate light control, and this embodiment employs this. The iris diaphragm 13 performs dimming by changing the aperture diameter by rotating the outer peripheral rotation ring 13a via the passive pin 13b included therein.
[0028]
In order to control the light control, an actuator 25 is attached to the unit of the light source 3, and a swing rod 25 b provided on a rotation shaft 25 a of the actuator 25 and the passive pin 13 b are connected by a link 26. If the rotation angle of the rotary shaft 25a is controlled by the actuator 25, the aperture diameter of the iris diaphragm 13 can be determined, and the amount of the light beam incident from the light source 3 onto the light source 3 side end face of the converging part 5a of the optical fiber 5 is controlled. This control is dimming.
[0029]
In the fourth embodiment shown in FIG. 6, a light shield 14 is provided in each of a plurality of high-brightness star projection cylinders 4 so that light shielding and light shielding can be canceled. The light shield 14 is concentrically located on the optical axis of the projection lens 9 on the optical axis of the projection lens 9 while forming a conical body having the same shape as the spread of the light flux from the optical fiber 5, and the optical fiber 5 side or the projection lens 9 side in the optical axis direction. This surface is cut out from the lateral direction perpendicular to the optical axis so as to form a semicircular surface 14a. On the other hand, an actuator 31 having a rotation axis 31a around an axis passing through the intersection of the semicircular surface 14a and the optical axis and perpendicular to them is attached to the unit of the high-brightness projection cylinder 4 and the rotation The light shield 14 is fixed to the shaft 31a.
[0030]
In the state shown in FIG. 6, the light beam from the optical fiber 5 is completely blocked by the light shield 14 and cannot be projected. If the actuator 31 is operated from this state and the light shield 14 is rotated by 90 °, the light beam passes through the semicircular surface 14a, so that projection can be performed. Therefore, by individually controlling the actuator 31 of each high-brightness star projection cylinder 4, not only the control for preventing high-brightness stars from being projected below the parting line of the dome screen, but also the high brightness overlapping with the projected image from the video projector. It can also be controlled not to project stars.
[0031]
Finally, in the stellar projection tube 2 shown in FIG. 2, the stellar original plate 8 may be a unit that allows light to pass through only a portion where voltage is applied by sandwiching liquid crystal and electrodes between two light shielding plates. Normally, the liquid crystal is weak against heat and is not suitable for a planetarium. However, since only the light beam that has passed through the optical fiber 5 hits the liquid crystal, it is not affected by the heat from the light source 3. According to the liquid crystal original plate, for example, the position and number of the star to be projected can be freely controlled only by controlling the position of the liquid crystal to which the voltage is applied.
[0032]
Furthermore, since the transmittance of the light flux is reduced to 50% or less by the deflecting plate, it was difficult to project a star with high brightness. However, a star with high brightness compensates for it by projecting from the bright star projection cylinder 4. be able to.
[0033]
【The invention's effect】
According to the present invention, as is apparent from the above description, the brightness of the bright star projection image is sufficiently increased without increasing the power of the light source or enlarging the transmission hole of the high bright star base plate, and includes high bright stars. All stars can be produced with a visual diameter that is recognized as a point, and the problem of temperature rise caused by increasing the power of the light source is solved. Further, since the optical fiber is simply connected to each star projection tube and the high brightness star projection tube, the assembly work and the repair work when the optical fiber is disconnected are easy.
[Brief description of the drawings]
FIG. 1 is a partial schematic configuration diagram showing a stellar projector of a first example according to a typical embodiment of the present invention.
2 is a cross-sectional view of the star projection cylinder of FIG. 1. FIG.
3 is a cross-sectional view of the high-brightness star projection cylinder of FIG. 1. FIG.
FIG. 4 is a perspective view illustrating a light source unit including a light shield according to a second embodiment.
FIG. 5 is a perspective view showing a light source unit provided with a light control means according to a third embodiment.
FIG. 6 is a cross-sectional view of a high-brightness star projection cylinder provided with a light shield according to a fourth embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stellar sphere 2 Stellar projection cylinder 3 Light source 4 High star projection cylinder 5 Optical fiber 5a Condensing part 6 Condensing lens 7 Stellar projection lens 8 Stellar original plate 9 High star projection lens 10 High bright star original plates 11, 14 Shading element 13 Iris stop

Claims (9)

During stellar be projected imaged, a predetermined high bright star is projected from Koteru Review projection tube, a star projector of planetarium star other than the predetermined high bright star is projected from the star projection tube, Koteru Hoshihara plate and Koteru A plurality of high star projection cylinders configured with a star projection lens, a plurality of star projections configured with a star original plate, a condenser lens, and a star projection lens for projecting more stars. in a cylindrical, light from the light source to guide Kuno by an optical fiber or optical fiber bundle is branched from the light source individually, that light energy for distribution was lower side of the high-bright star projection tube of the side of the stellar projection tube A planetarium star projector.   The high brightness star plate expresses one or a suitable number of high brightness stars, and the star base plate expresses a projected image of the number of stars divided by the number of star projection tubes from a star excluding the plurality of high brightness stars. Planetarium star projector as described.   The planetarium according to any one of claims 1 and 2, further comprising a light-shielding element that moves while shielding a part of the end face of the converging part between the converging part on the light source side of the optical fiber or the optical fiber bundle and the light source. Stellar projector.   A dimming means that changes the aperture of the diaphragm by a signal from the outside of the projector and changes the amount of light irradiated from the light source to the converging unit between the converging unit on the light source side of the optical fiber or the optical fiber bundle and the light source. The planetarium star projector according to any one of claims 1 to 3.   The light shielding element is provided in the vicinity of the front and rear of the projection lens of each high-brightness star projection tube so that light from each high-brightness star projection tube can be independently shielded and released from light shielding. Planetarium star projector.   6. The planetarium star projector according to claim 1, wherein the star base plate of the star projection cylinder is a liquid crystal base plate that allows light to pass through only a liquid crystal portion to which voltage is applied. The optical fibers or optical fiber bundles individually branched from the light source are set to have a distribution number so that the light energy distribution to the stellar projection tube and the high brightness star projection tube is suitable, and the light branched to the high brightness star projection tube The tip of the fiber or fiber bundle reaches the high star base plate at the rear of the projection lens, and the tip of the optical fiber or optical fiber bundle that branches to the star projection tube is effectively captured by the condenser lens at the back of the star projection plate of the star projection tube. The planetarium star projector according to any one of claims 1 to 6, wherein the planetarium star projector has reached a position .   8. The planetarium star projector according to claim 7, wherein the distribution of light energy between the star projection cylinder and the high-brightness star projection cylinder is set in accordance with a ratio of the projection angle of each.   The cross-sectional area of the light guide path formed by the optical fiber or the optical fiber bundle or the area ratio of the light guide surface is set for the high brightness star projection tube and the star projection tube. Planetarium star projector as described in

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