JP5089085B2 - Planetarium star projector - Google Patents

Description

  The present invention relates to a planetarium stellar projector that considers projecting bright stars and other stars efficiently with a projection unit.

In a conventional planetarium star projector, a star is projected using a plurality of projection units using a transmission pattern corresponding to a real star.
Conventional incandescent lamps, discharge lamps, etc. are used as illuminating devices of this transmission pattern, and recently, those using light emitting diodes have appeared, but the principle of illuminating the entire surface of the stellar original plate has changed. There is no.
In this method, since the area of the transmission part of the transmission pattern is extremely small in the total area of the star image, most of the light illuminated from the light source is blocked by the star original plate, resulting in extremely inefficient illumination. Although it is necessary to make the transmission hole as small as possible in order to bring the projected image closer to a real star, the amount of light passing through the transmission hole is proportional to the area of the transmission hole. In order to secure the light source, the smaller the transmission hole, the stronger the light from the light source, and there have been problems with heat generation, power consumption, and projector cooling.

  On the other hand, with the known planetarium projector star plate, the star plate is not simply a plate with a transmission hole, but an optical fiber is connected to each part corresponding to the star, and one end of the optical fiber is bundled and illuminated with a light source. Thus, the light from the light source is efficiently used, and the above-described problem is greatly solved by such a configuration. For example, Patent Document 1 is cited as an example of the above type planetarium projector. However, this method requires as many optical fibers as the number of stars, and it takes a lot of time to manufacture and maintain the original stars.

In addition, if the starlit sky division projection method proposed by the present inventors (Patent Document 2) is used, it is possible to project a very large number of stars exceeding 1 million, and a remarkably high-definition and realistic starry sky is reproduced. Although it is possible, it is very difficult to install a large number of optical fibers in the system using individual optical fibers for all the stars, and in fact, the number of stars has to be greatly limited.
Furthermore, in a known planetarium projector, a plurality of individual bright star projection devices corresponding to bright stars have been provided, and this has been traditionally performed by superimposing on general stars, and is currently being improved. Although it is used, if the number of bright stars projecting devices is set as many as the number of bright stars to be projected individually, the cost for manufacturing these naturally increases, and it takes time to adjust each projecting device. It was. Further, the size of the projector tends to increase due to the space occupied by each projector, and there are restrictions on the design of the entire planetarium projector.
U.S. Pat. No. 4,776,666 JP 2001-134172 A

  The present invention solves the above-mentioned problems, and its purpose is to increase the cost compared to conventional projectors while projecting bright stars brightly and realistically with a very small visual diameter like real stars. It is an object of the present invention to provide a planetarium star projector capable of projecting a large number of stars without incurring a star and obtaining a fine starry sky projection image.

In order to achieve the above object, claim 1 of the present invention is a planetarium star projector that projects a star by a plurality of projection unit means, a common light source, a condenser lens that converges light from the common light source, A star base plate having a transmission hole pattern, a mount in which the condenser lens is attached to an upper end portion, the star base plate is attached to an intermediate portion, and a space is formed between the condenser lens and the star base plate, and attached to a lower end portion of the mount A projection lens that projects light emitted from the stellar original plate onto a dome screen, and guides an optical fiber group in which a plurality of optical fibers are bundled from the mount surface between the condenser lens and the stellar original plate to the space portion, The extraction path of each optical fiber of the optical fiber group guided to the space is a space further away from the stellar original plate. The density of the shadow dropped on the star original plate is reduced by passing through the optical fiber, and each optical fiber is inserted into a transmission hole corresponding to a specific star on the star original plate with an inclination of an angle corresponding to the position of the star. The light of the bright star light source is incident on the other end of each optical fiber to project the light of the bright star light source to the corresponding position of the dome screen, and the light of the common light source is projected by the condenser lens. By irradiating the entire surface of the star original plate, stars other than bright stars connected to the optical fiber are projected onto corresponding positions of the dome screen by the light of the common light source .
According to a second aspect of the present invention, there is provided a planetarium star projector for projecting a star by a plurality of projection unit means. The star has a common light source, a condenser lens for converging light from the common light source, and a plurality of transmission hole patterns. The original plate, the condenser lens is attached to the upper end, the stellar original plate is attached to the intermediate portion, and a space is formed between the condenser lens and the stellar original plate, and the lower end of the mount is attached, and is emitted from the stellar original plate. And a convex lens having a positive refractive power disposed between the stellar original plate and the projection lens, and a plurality of lights from a mounting surface between the condenser lens and the stellar original plate. An optical fiber group in which fibers are bundled is guided to the space portion, and each optical fiber of the optical fiber group guided to the space portion is guided. The drawing path of the optical fiber passes through a space part farther away from the stellar original plate so as to reduce the concentration of shadows dropped on the stellar original plate, and each optical fiber is passed through a transmission hole corresponding to a specific bright star of the stellar original plate. By connecting each of the star original plates so as to be perpendicular to each other, and making the light of the bright star light source enter from the other end of the plurality of optical fibers, the light of the bright star light source that has passed through the transmission hole is transmitted to the convex lens and A bright star projected onto the corresponding position of the dome screen by the projection lens, irradiated with light from the common light source to the entire surface of the star original plate by the condenser lens, and connected to the optical fiber by the light from the common light source The other stars are projected onto the corresponding positions of the dome screen .
According to a third aspect of the present invention, in the invention according to the first or second aspect , an incandescent lamp or a discharge lamp is used as the common light source of the stellar original plate, or these lights are used as an optical fiber, an optical fiber bundle or a liquid light guide. It is characterized by using light emitted from the exit end.
According to a fourth aspect of the present invention, in the invention according to the first or second aspect , the bright star light source uses a metal halide lamp, an incandescent lamp, a discharge lamp, a light emitting diode, or a laser diode, or these lights are optical fibers, A light source guided by an optical fiber bundle or a liquid light guide is used.
That is, according to the present invention, an optical fiber is attached to a portion corresponding to a bright star of a stellar original plate having a large number of transmission holes corresponding to the stellar, and the entire surface of the stellar original plate is illuminated by a common light source, while the optical fiber is used with an individual light source. By illuminating efficiently, general stars can be reproduced in the same way as conventional planetariums, while bright stars can be projected brighter and smaller and realistically.

  According to the above configuration, it is possible to realize a planetarium projector that projects a large number of stars at low cost without incurring the complexity and adjustment of the star projector, and more realistic by projecting bright stars with high brightness. The starry sky can be reproduced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional view showing an embodiment of a planetarium star projector according to the present invention. This figure illustrates one of a plurality of projection units provided in the stellar projector. A mount 2 of the projection unit 21 is attached to a stellar spherical structure shell 1 constituting the stellar projector. The light from the incandescent bulb 12 that is a common light source is collected by the condenser lens 6, passes through the transparent glass support substrate 5, passes through a large number of transmission holes 15 provided in the stellar original plate 4, and is projected by the projection lens 3. It is projected on a dome screen (not shown).

  On the other hand, light from the laser diode 11, which is a bright star light source, is collected by the condenser lens 10, enters the end face of the upstream optical fiber 8, and is guided to the connector 14. The connector 14 is led to a single or a plurality of downstream fibers 7, and the downstream fibers 7 pass through through holes 5 a provided in the support substrate 5 so as to contact the bright star transmission holes 15 provided in the star original plate 4. is set up. For this reason, the light from the laser diode 11 efficiently illuminates only bright stars. At this time, the end of the optical fiber is tilted by an angle θ according to the position of the bright star transmission hole 15. The through holes 5a of the support substrate 5 are formed so as to have this inclination. With such a configuration, the light guided by the optical fiber efficiently enters the projection lens 3 after passing through the transmission hole 15.

  FIG. 2 is a diagram for explaining a connection state between a star original plate and a downstream fiber end portion for a bright star. The stellar original plate 4 is formed with transmission holes 4a for projecting a large number of stars, among which bright star transmission holes 15a to 15n are provided. Downstream fiber end faces 7a to 7n are installed to face the bright star transmission holes 15a to 15n, respectively. The downstream fiber end is fixed by being fitted into a through-hole (bright star fiber conduction hole) 5a having a predetermined angle (an angle corresponding to each bright star) formed in the transparent support substrate 5 installed in front.

  In this way, by guiding the end face of the downstream fiber to the transmission hole 4a of the star original plate 4, the downstream optical fiber 7 passes under the illumination light of the common light source. There is a risk of unevenness and loss in the image. However, a space of a certain extent is provided between the star original plate 4 and the support substrate 5 and the condenser lens 6, the drawing path of the downstream fiber 7 from the connector 14 is kept away from the star original plate 4 as much as possible, and the downstream fiber 7 is a thin fiber. As a result, the shadow of the downstream fiber 7 that falls on the stellar original plate 4 becomes darker and blurs, and can be used substantially without problems.

When the laser diode 11 is used as a bright star light source, a bright image can be further increased and a realistic image can be reproduced by the high brightness characteristic peculiar to the laser. In such a case, a single laser diode can emit only monochromatic light. However, if the laser diodes of the three primary colors of red, green and blue are used with the configuration as shown in FIG. 3, white light with high luminance can be obtained.
FIG. 3 is a diagram for explaining the configuration of a white laser light source device using red, green, and blue laser diodes.
The blue light from the blue laser diode B is collimated by the condenser lens 10B, bent at a right angle by the prism 18, enters the dichroic prism 19GB, is combined with the green light emitted from the green laser diode G, and is further dichroic. The red light from the red laser diode R is combined by the prism 19RGB into white laser light. The white laser light is converged and incident on the incident end of the upstream fiber 8 by the condenser lens 10W.
If a blue laser diode is used and an upstream optical fiber having a wavelength conversion function is used, white laser light can be obtained by the fiber, and illumination with high-intensity white light is also possible. it can.

In FIG. 1, a switch circuit 16 is connected to the laser diode 11, and a current control circuit 17 is connected to the switch circuit 16. The current control circuit 17 can control the drive current of the laser diode to an arbitrary value by an external command, and has a function of freely changing the brightness of the bright star. The switch circuit 16 can arbitrarily turn on and off the current of the laser diode by an external command, and brings about an effect like a blink on a bright star.
In this way, by controlling the power supply voltage and drive current of the bright star light source, not only can the brightness of the bright star image be adjusted freely, but the actual star can be modulated by randomly turning on / off or modulating the intensity individually. A blinking effect similar to can be obtained.
In addition, a light emitting diode, an incandescent light bulb, etc. can also be used as the bright star light source. Similarly, in this bright star light source, the effect of brightening the bright star and the bright star brightness are changed by the switch circuit and the current control circuit. It is possible that

FIG. 4 is a sectional view showing another embodiment of a planetarium star projector according to the present invention.
In this embodiment, a lens 13 having a positive refractive power is provided between the stellar original plate 4 and the projection lens 3, the downstream fiber is connected perpendicularly to the stellar original plate 4, and the downstream fiber end surface is directed to the surface of the stellar original plate 4. The vertically incident light is incident on the projection lens 3.
In this embodiment, the downstream fiber can be attached at a right angle to the stellar original plate 4, so that the downstream fiber mounting operation is simplified as compared with the embodiment of FIG. Other components are the same as in FIG.

FIG. 5 is a sectional view showing still another embodiment of a planetarium star projector according to the present invention.
This embodiment is an example in which the liquid light guide 20 is used as a common light source. Other components are the same as in FIG. Since the light source can be provided on the opposite end surface of the liquid light guide 20, the installation position of the common light source can be arbitrarily selected similarly to the bright light source.

In the above embodiment, the example using the switch circuit and the current control circuit to realize the brightness change and blinking of the bright light source has been described. However, the means for switching the bright light source is not only electrically controlled but also mechanical In addition to changing the current value as a means for changing the luminance, it may be realized by inserting an optical filter (such as an ND filter) on the emission side of the laser diode.
Moreover, a discharge lamp, an optical fiber, an optical fiber bundle, etc. can also be used as a common light source, and a metal halide lamp, a discharge lamp, an optical fiber, an optical fiber bundle can also be used as a bright star light source.

  It is a planetarium star projector that can be used to project bright stars and other stars efficiently with a projection unit installed at event venues and planetarium facilities.

1 is a cross-sectional view showing an embodiment of a planetarium star projector according to the present invention. It is a front view of the star original plate of FIG. It is a figure for demonstrating the structure of the white laser light source device by a red, green, and blue laser diode. It is sectional drawing which shows other embodiment of the planetaryium star projector by this invention. FIG. 6 is a cross-sectional view showing still another embodiment of a planetarium star projector according to the present invention.

Explanation of symbols

1 Stellar sphere structure 2 Mount
3 Projection lens
4 Stellar original plate
5 Support substrate
6, 10 Condenser lens 7 Downstream fiber 8 Upstream fiber 9 Light source device 11 Laser diode 12 Incandescent ball 13 Convex lens 14 Connector
15, 15 a, 15 b... Transmission hole 16 Switch circuit 17 Current control circuit 20 Liquid light guide 21 Projection unit

Claims (4)

In a planetarium star projector that projects a star by means of a plurality of projection units,
A common light source,
A condenser lens for converging light from the common light source;
A stellar original plate having a large number of transmission hole patterns;
The condenser lens is attached to the upper end, the stellar original plate is attached to an intermediate portion, and a mount that forms a space between the condenser lens and the stellar original plate,
A projection lens that is attached to the lower end of the mount and projects light emitted from the stellar original plate onto a dome screen;
With
An optical fiber group in which a plurality of optical fibers are bundled from a mount surface between the condenser lens and the stellar original plate is guided to the space portion, and a drawing path of each optical fiber of the optical fiber group guided to the space portion is the stellar The density of the shadow dropped on the stellar original plate is reduced by passing through a space part further away from the original plate,
Each optical fiber is connected to a transmission hole corresponding to a specific bright star of the star original plate with an inclination of an angle corresponding to the position of the bright star, and light from the bright star light source is incident from the other end of each optical fiber. By projecting the light of the bright star light source to the corresponding position of the dome screen,
In addition, by irradiating the light of the common light source on the entire surface of the stellar original plate with the condenser lens, stars other than bright stars connected to the optical fiber are projected onto the corresponding positions of the dome screen by the light of the common light source. A planetarium star projector. In a planetarium star projector that projects a star by means of a plurality of projection units,
A common light source,
A condenser lens for converging light from the common light source;
A stellar original plate having a large number of transmission hole patterns;
The condenser lens is attached to the upper end, the stellar original plate is attached to an intermediate portion, and a mount that forms a space between the condenser lens and the stellar original plate,
A projection lens that is attached to the lower end of the mount and projects light emitted from the stellar original plate onto a dome screen;
A convex lens having a positive refractive power disposed between the star original plate and the projection lens;
With
An optical fiber group in which a plurality of optical fibers are bundled from a mount surface between the condenser lens and the stellar original plate is guided to the space portion, and a drawing path of each optical fiber of the optical fiber group guided to the space portion is the stellar The density of the shadow dropped on the stellar original plate is reduced by passing through a space part further away from the original plate,
Each optical fiber is connected to a transmission hole corresponding to a specific bright star of the stellar original plate so as to be perpendicular to the stellar original plate, and the light of the bright star light source is incident from the other end of the plurality of optical fibers. Thus, the light of the bright star light source that has passed through the transmission hole is projected onto the corresponding position of the dome screen by the convex lens and the projection lens,
And, the light of the common light source is irradiated on the entire surface of the star original plate by the condenser lens, and stars other than bright stars connected to the optical fiber are projected onto the corresponding position of the dome screen by the light of the common light source. A planetarium star projector. Common sources of the stellar original plate is an incandescent lamp, or to use a discharge lamp, or optical fibers these lights, the claims guided by the optical fiber bundle or liquid light guide, characterized by using a light emitted from the exit end A planetarium star projector according to 1 or 2 . The bright star light source may be a metal halide lamp, an incandescent lamp, a discharge lamp, a light emitting diode, a laser diode, or a light source in which these lights are guided by an optical fiber, an optical fiber bundle or a liquid light guide. 3. A planetarium star projector according to claim 1 or 2 .

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