JP3431428B2 - planetarium - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetarium. 2. Description of the Related Art In general, a planetarium provided with an astronomical phenomenon projector for projecting an astronomical phenomenon related to an astronomical object projected by an astronomical projector is known. For example, a planetarium equipped with a sun projector and a morning / sunset projector is known. Conventionally, such an astronomical phenomenon projector is mounted on a fixed base, or mounted on a rotating base of a star projector for projecting a starry field. [0003] By the way, in a planetarium, an astronomical image is configured to be projected at an arbitrary position in order to reproduce a change in time, season, or the like. However, conventional astronomical phenomena mounted on a fixed base can project astronomical phenomena only in a predetermined direction. There is a problem that the position and the projection position of the astronomical phenomenon are shifted. Further, when the astronomical phenomenon projector is mounted on a rotating frame, the projection position of the astronomical object and the projection position of the astronomical phenomenon are also shifted by the rotation of the rotating frame. The present invention has been made in view of the above problems, and an object of the present invention is to provide a planetarium in which a projection position of an astronomical phenomenon is interlocked with a projection position of an astronomical image. SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and is rotatable about two axes.
And a solar projector that projects the solar image at an arbitrary position on the dome screen, and a rotatable projector about a vertical axis.
Vignetting, morning and evening glow projector for projection morning sunset anywhere on the dome screen, morning projection position of the sun image by the solar projector so as to follow the sunset, the thickness of the solar projector
Calculation for calculating the rotation angle of the morning and evening glow projector based on the positive azimuth angle
Is repeated while the solar projector is moving the solar image.
And control means for controlling the projection direction of the morning and sunset projector sequentially . [0006] In such a configuration, in correspondence with the projection position of the sun image sun projector is to project, by projection direction of the morning sunset projector is controlled by the control means, the thickness of sunset morning
It can be projected so as to follow the projection position of the sun image. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A planetarium according to the present embodiment has an overall configuration as shown in FIG. 1, and a star projector 3 for projecting a star field on a dome screen 5 is arranged at the center of a dome. ing. The stellar projector 3 is mounted on a rotating base 4 that can rotate around a vertical axis. A pair of morning and sunset projectors 1 and 2 are arranged on the rotating gantry 4.
As shown in a plan view in FIG. 2, the morning and sunset projectors 1 and 2 are mounted at symmetrical positions with respect to the rotation axis of the rotating gantry 4 so as to be rotatable around independent vertical axes. . In addition, a solar projector 6 for projecting a solar image on the dome screen 5 is provided near the rotating gantry 4. The sun projector 6 is provided so as to be rotatable about two axes with each other, and can project a solar image at an arbitrary position on the dome screen 5. The planetarium according to the present embodiment has a control circuit such as the block shown in FIG. 3 and has an X-axis motor 11, a Y-axis motor 12 for rotating and driving the solar projector 6,
The horizontal rotation motors 13 and 14 for horizontally rotating the morning and sunset projectors 1 and 2 and the gantry rotation motor 26 for horizontally rotating the gantry 4 are motor drivers 15 respectively.
Are connected to the CPU 19 through.
The motors 11 to 14 and 26 are provided with encoders 11a to 14a and 26a for detecting the respective rotation speeds.
a, 26a are fed back to the motor drivers 15-18, 27. The motor drivers 15 to 18 and 27 control the driving of the motors 15 to 18 and 27 based on signals from the CPU 19 and signals from the encoders 11a to 14a and 26a. The light source lamps 21 and 22 of the morning and sunset projectors 1 and 2
It is connected to the CPU 19 via the lighting circuits 23 and 24. The lighting circuits 23 and 24 adjust the light of the light source lamps 21 and 22 based on a signal from the CPU 19. An operation panel 25 is also connected to the CPU 19. From the operation panel 25 to the CPU 19, data relating to the time of the effect and the viewpoint position of the observer are input. Next, control of the horizontal rotating motors 13 and 14 of the morning and evening projectors 1 and 2 will be described with reference to FIG. In the present embodiment, the azimuth of the sun projected by the sun projector 6 (hereinafter referred to as the sun azimuth) and the distance from the center of the dome to the center of rotation of the morning and sunset projectors 1 and 2 (hereinafter referred to as the sun). The horizontal rotation motors 13 and 14 of the morning and evening glow projectors 1 and 2 are controlled by the projection angle calculated based on the offset amount) and the rotation angle of the rotary base 4. As a result, the sunrise, sunset, twilight, twilight, and the like are projected and projected on the azimuth at which the solar image is projected by the solar projector 6. That is, as shown in FIG. 2, the sun azimuth is θ degrees, the rotation angle of the rotating base is ω degrees, the dome radius is R mm,
When the offset amount is L mm, the rotation angle η of the morning and sunset projector 1 is approximately: η = (θ−ω) + δ (θ−ω) / 90−δ (1) where δ = tan -1 (L / R). The calculation of the equation (1) is repeatedly executed while moving the solar image, and the horizontal rotation motor 1
3 and 14 are driven. Thereby, the morning and evening glow can be made to follow the movement of the sun image. In the present embodiment, the morning and evening sunset projector 1,
2 is attached to the rotating gantry 4, but in the case where the morning and sunset projectors 1 and 2 are attached to the fixed base, the rotation is performed by setting ω = 0 in the above equation (1). If the angle η is determined and followed, the same result can be obtained. Next, the dimming control of the morning and evening glow projectors 1 and 2 will be described. When the projection position of the solar image by the solar projector 6 is close to one of the morning and sunset projectors 1 and 2, the morning and sunset projector closer to the solar image projection position (the morning and sunset projector 1 in FIG. 2). ) May be turned on, and the light source lamp of the other morning and sunset projector may be turned off. However, if the morning and sunset projectors 1 and 2 are always selectively turned on, there is a problem in moving the solar image from the projection range of one morning and sunset projector to the projection range of the other morning and sunset projector. . Such a case inevitably occurs when the sun image is moved by 180 degrees or more in the azimuth angle, such as in the production of night and night. That is, when the projection position of the sun image changes from the projection range of one morning and sunset projector to the projection range of the other sunset and sunset projector, the light source lamp that was lit up until then is turned off, and the light source lamp that was turned off is turned off. Is turned on, there is a time lag between turning off one of the light source lamps and turning on the other light source lamp, so that there is a problem that the morning and sunset images disappear for a moment. In order to solve these problems, in the present embodiment, as shown in FIG.
When a part of the projection range is overlapped and the morning glow is lit in the overlapped range, the dimming control is performed so that the light source lamps 21 and 22 of both the morning and sunset glow projectors 1 and 2 are lit. Specifically, the projection range of the morning / sunset projector 1 is a range 7 wider by an angle W to the left and right than a takeover boundary line obtained by dividing the dome screen at an azimuth of 180 degrees. On the other hand, with respect to the morning and evening sunset projector 2, a projectable range having the same size as the projectable range of the morning and sunset sunset projector 1 is set. Therefore, an area at an angle of 2 W at the left and right ends as viewed from each of the morning and sunset projectors 1 and 2 is an overlapping range in which the projectable ranges overlap each other. By turning on the light source lamps of both morning and sunset projectors during the projection of the morning and sunset in this overlapping range, the projection position of the solar image is shifted from the projection range of one morning and sunset projector to the other morning. The inconvenience that the morning and sunset glow disappears momentarily when shifting to the projection range of the sunset projector can be solved. Further, while projecting the morning glow in the overlapping range, the light amount of the light source lamp of one of the morning glow
% From 0% and gradually increasing the light amount of the light source lamp of the other morning and sunset projector from 0% to 100%, it is possible to prevent the brightness of the morning and sunset from fluctuating. . For this purpose, the ratios α and β of the output light amounts of the sunrise projectors 1 and 2 within the overlapping range are determined by one of the following linear equations (2) and (3). Linear equation (2) α = (1−θ / 2W) × 100 β = (1− (2W−θ) / 2W) × 100 Quadratic equation (3) α = (1− (θ / 2W) ) ² ) × 100 β = (1 − ((2W−θ) / 2W) ² ) × 100 Here, θ represents an angle (0 = <θ <= 2W) in which the projection direction falls within the handover range. Based on the result, the morning and evening projectors 1, 2
Is dimmed as follows. [Output light quantity of projector 1] = [input light quantity] × α / 100 [Output light quantity of projector 2] = [input light quantity] × β / 100 FIG. 5 shows a case where linear equation (2) is used. Morning Sunset Projector 1,
FIG. 6 shows a change in the amount of light of the morning and evening sunset projectors 1 and 2 when the quadratic expression (3) is used. In the above embodiment, an example in which the solar projector 6 is applied as an astronomical projector has been described.
Instead, a lunar projector may be applied. As an astronomical phenomenon in this case, moonlight is effective. Further, in the above embodiment, an example was described in which the astronomical phenomenon follows the azimuth change of the astronomical image. However, the astronomical phenomenon may follow the altitude change of the astronomical image.
As astronomical phenomena in this case, a rainbow, a moonbow (rainbow by the moon), and a ragged moon are effective. Further, the astronomical phenomenon may follow a position exactly opposite to the projection position of the astronomical image. As an astronomical phenomenon in this case, Brocken and sunshine are effective. Also, a rotary mount 4 on which an astronomical phenomenon projector is mounted.
Is not limited to a rotating frame on which a stellar projector is mounted, but may be another suitable projector such as a rotating frame on which a panoramic projector is mounted. According to the present invention, an astronomical phenomenon corresponding to an astronomical object can be projected so as to follow the projection position of the astronomical image. For this reason, a natural phenomenon can be produced more accurately. In particular, when the astronomical projector is a sun projector and the astronomical phenomena projector is a sunrise / sunset projector as in the invention of claim 2, the sunrise / sunset is set at a position corresponding to the azimuth angle of the sun. Since the projection can be made to follow , the production of white nights is also possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an entire configuration of a planetarium according to an embodiment of the present invention. FIG. 2 is a top view of a main part of the planetarium of FIG. FIG. 3 is a block diagram showing a control circuit of the planetarium in FIG. 1; FIG. 4 is a top view illustrating a projection range of the astronomical phenomenon projector of the planetarium in FIG. 1; FIG. 5 is a graph showing an example of dimming of the planetarium astronomical projector of FIG. 1; 6 is a graph showing another example of dimming of the planetarium astronomical projector of FIG. 1. FIG. [Description of Signs] 1, 2: Astronomical phenomena projector (morning and sunset glow projector) 4 Rotating stand 5 Dome screen 6: Astronomical projector (sun projector) 19: CPU (control means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-29680 (JP, A) JP-A-54-31320 (JP, A) JP-A-6-78965 (JP, U) JP-A-54 33758 (JP, U) (58) Fields studied (Int. Cl. ⁷ , DB name) G09B 27/00-27/12

Claims (1)

(57) [Claims 1] The sun is provided rotatably around two axes.
A sun projector that projects the image at an arbitrary position on the dome screen, and a dome that is installed rotatably around a vertical axis to
Morning and evening glow projector for projection at an arbitrary position on the screen, in order to follow the morning sunset projection position of the sun image by the solar projector, the based on the sun azimuth of the sun projector
The calculation to find the rotation angle of the morning and sunset
Control means for repeatedly executing the movement of the sun image while the apparatus is moving the sun image, and sequentially controlling a projection direction of the morning and evening sunset projector.