CN102004387B - Full screen projection system with double helix screen - Google Patents

Abstract

The invention relates to a double-helix screen full-screen projection system, which is composed of a projection device and a rotating double-helix screen. The projection device is located above the rotating double-helix screen. The relative position makes the center of the projection image optical path projected by the lens on the projection device coincide with the center of the double helix screen, and at the same time makes the rectangular image surface at the lower end of the projection image light path inscribed on the double helix screen overlooking the circular surface, on the rotating double helix screen Realize the full-screen projection display inside the cylinder. The structure adopted by the present invention is easy to realize; the rotating double helix screen with a certain vibration is separated from the projection device, which increases the stability of imaging; no additional optical devices are needed to change the optical path, which reduces the resulting alignment error, A clear true three-dimensional image can be obtained.

Description

A double helix screen full-screen projection system

technical field

The invention belongs to the technical field of stereoscopic display and relates to a projection system used for true three-dimensional stereoscopic imaging.

Background technique

The use of rotating spiral surface as a display screen to generate true three-dimensional images has been implemented abroad. Researchers from Texas Instruments have conducted extensive research on the technology of laser scanning rotating spiral surfaces to generate true three-dimensional images. In the combination of spiral screen and laser scanning technology A combined three-dimensional display was attempted; German D. Bahr et al. used three-color lasers to scan a fast-rotating single-helical curved display to form a color true three-dimensional image. This kind of true three-dimensional display method adopts the integrated projection method of projecting from the bottom up; but this makes the overall structure of the system complex, the processing difficulty is relatively high, and the positioning accuracy of optical devices is relatively high. area; the imaging system structure projected from top to bottom simplifies the optical system of the system, makes full use of the imaging cylinder formed by the rotation of the entire rotating double helix screen, and separates the rotating double helix screen with a certain vibration from the projection device, increasing the Imaging stability is improved; no additional optical devices are needed to change the optical path, reducing the resulting alignment error, and a clear true three-dimensional image can be obtained.

Contents of the invention

In order to solve the problem of insufficient stability of the image generated by the single-sided screen in the prior art and the problem that the supporting structure of the double-sided screen blocks the viewing angle, the purpose of the present invention is to design a unique true three-dimensional stereoscopic imaging projection structure. Therefore, the present invention provides a A stable and reliable projection system that basically does not block the viewing angle and can form a true three-dimensional stereoscopic image in the imaging cylinder formed by the rotation of the entire rotating double helix screen.

In order to achieve the stated purpose, the present invention proposes a double-helix screen full-screen projection system that realizes full-screen projection in a cylinder on a rotating double-helix screen, consisting of a projection device and a double-helix screen; the projection device is located above the rotating double-helix screen, By adjusting the spatial position of the projection device, the relative position between the projection device and the double helix screen makes the center of the optical path of the projection image projected by the projection lens on the projection device coincide with the center of the double helix screen.

Beneficial effects of the present invention: the structure adopted by the present invention is easy to realize; the rotating double helix screen with a certain vibration is separated from the projection device, which increases the stability of imaging; no additional optical devices are needed to change the optical path, reducing the resulting A clear true three-dimensional image can be obtained by reducing the alignment error. The present invention adopts the imaging method of projection from top to bottom. The structure of this projection method simplifies the optical system of the system, fully utilizes the imaging cylinder formed by the rotation of the entire rotating double helix screen, and combines the rotating double helix screen with certain vibrations and The separation of the projection device increases the stability of imaging; no additional optical devices are needed to change the optical path, which reduces the alignment error caused by it, and can obtain a clear and stable true three-dimensional image.

Description of drawings

Fig. 1a is a full-screen projection system with a double helix screen of the present invention;

Figure 1b is a top view of Figure 1a;

Figure 1c is a top view of the light path of Figure 1a;

Figure 1d is a side view of the light path of Figure 1a;

Fig. 2 is a side view of the optical path when the main body of the projector is placed horizontally in the double-helix screen full-screen projection system of the present invention;

Description of main components:

Projection device 1

Projector main body 11 Projection lens 12

Angle adjustment plate 13 Supporting horizontal shaft 14

Support longitudinal axis 15

Double Helix Screen 2

Main body 21 Support shaft 22

Cylindrical imaging area 23 Looking down on the circular surface 24

Rotation axis 25

Projected image light path 3

Rectangular image surface 31 at the upper end of the optical path Rectangular image surface 32 at the lower end of the optical path

Center Ray 33

Detailed ways

Various details involved in the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be pointed out that the described embodiments are only intended to facilitate the understanding of the present invention, rather than limiting it in any way.

1. The main body of the double helix screen full-screen projection system

The architecture of the double-helix screen full-screen projection system, as shown with reference to Fig. 1a and Fig. 1b: the present invention is made up of a projection device 1 and a double-helix screen 2; The spatial position, so that the relative position between the projection device 1 and the double helix screen 2 makes the center of the optical path of the projected image projected by the projection lens on the projection device 1 coincide with the center of the double helix screen 2 . The projection device 1 comprises: a projector main body 11, a projection lens 12, an angle adjustment plate 13, a support horizontal axis 14 and a support vertical axis 15, the projector main body 11 is located on the angle adjustment plate 13, and the projection lens 12 is located on the projector main body 11 On the left side, the angle adjustment plate 13 is connected to the support horizontal axis 14, the support horizontal axis 14 is connected to the support vertical axis 15, and the support vertical axis 15 stands on the ground; the angle adjustment plate 13 is used to adjust the projector main body 11 relative to the support vertical axis 15 The angle and the length of the supporting horizontal axis 14 make the center of the projection image optical path 3 projected by the projection lens 12 on the projection device 1 coincide with the center of the double helix screen 2 .

The double helix screen 2 includes: a main body 21, a support shaft 22, a cylindrical imaging area 23, a circular surface 24 and a rotation axis 25, the double helix screen 2 is a double helix curved screen, and the double helix curved screen and the support shaft 22 The center is symmetrical and located below the projection device 1 . The main body 21 is supported by the support shaft 22 , and the top-view circular surface 24 is symmetrical about the center of the rotation axis 25 . During imaging, the main body 21 rotates to form a cylindrical imaging area 23 with the circular surface 24 as the bottom surface and the rotation axis 25 as the height.

As shown with reference to Fig. 1c and Fig. 1d: the projection lens 12 casts a projection image optical path 3 which is an isosceles trapezoid seen from the side to the double helical screen 2, the rectangular image surface 31 on the upper end of the optical path coincides with the projection lens 12, and the lower end of the optical path The rectangular image surface 32 is a square cbfg in Fig. 1d; the relative position between the projection device 1 and the double helix screen 2 makes the center of the projected image optical path 3 projected by the projection lens 12 coincide with the center of the double helix screen 2, and simultaneously makes the optical path The lower rectangular image surface 32 is inscribed in the top view circular surface 24 .

2. The tilt angle of the main body of the projection system

As shown in FIG. 1d and FIG. 2: in order to make the relative position between the projection device 1 and the double helix screen 2 make the center of the projected image optical path 3 projected by the projection lens 12 coincide with the center of the double helix screen 2, so that The rectangular image surface 32 at the lower end of the optical path is inscribed in the top view circular surface 24, and the determination of the angle between the angle adjustment plate 13 and the support longitudinal axis 15 is as follows:

As shown in Figure 2, when the projector main body 11 is placed horizontally on the ground, the distance from the projection lens 12 to the ground is h=6.85cm; when the projector main body 11 is placed horizontally on the ground, the projection lens 12 projects vertical The distance between the lower end of the square image on the placed screen and the ground is H. When the whole system is placed as shown in Figure 1d, when the rectangular image surface 32 at the lower end of the optical path is inscribed on the circular surface 24, the measured H=9.99cm; at the same time Measure the distance L=47.2cm from the projection lens 12 to the rectangular image surface 32 at the lower end of the optical path; so it can be obtained by the formula

$\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; the\; tan</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\frac{\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; ,</span>$

Calculate the elevation angle of optical path 3 of the projected image at this time:

At the same time, the angle β between the central ray 33 of the projected image optical path 3 and the horizontal reference plane can also be obtained by the formula:

Therefore, the projector main body 11 is tilted at an angle of β, that is, in Fig. 1f, so that:

∠eod=β=14.9°,

The optical path offset angle of the projector main body 11 is parallel to the angle adjustment plate 13; the projector main body 11 is tilted at a certain angle, and the relative distance between the projection device 1 and the double-helical screen is adjusted at the same time, so that the central ray 33 in Fig. 1d is perpendicular to The rectangular image surface 32 at the lower end of the optical path can make the rectangular image surface 32 at the lower end of the optical path inscribed on the circular surface 24 while ensuring that the center of the projection image optical path 3 projected by the projection lens 12 on the projection device 1 rotates with the double helix screen 2 The centers of the formed cylinder imaging areas 23 coincide to achieve the purpose of realizing full-screen projection display in the cylinder on the rotating double-helix screen.

The above is only a specific implementation mode in the present invention, but the scope of protection of the present invention is not limited thereto. Anyone familiar with the technology can understand the conceivable transformation or replacement within the technical scope disclosed in the present invention. All should be covered within the scope of the present invention, therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (1)

1. The double-helix screen full-screen projection system is characterized in that: it is made up of a projection device (1) and a double-helix screen (2); ), so that the relative position between the projection device (1) and the double helix screen (2) makes the center of the light path of the projected image projected by the projection lens on the projection device (1) and the center of the double helix screen (2) coincide; The projection device (1) includes: a projector main body (11), a projection lens (12), an angle adjustment plate (13), a support horizontal axis (14) and a support vertical axis (15), and the projector main body (11) is located at On the angle adjustment plate (13), the projection lens (12) is positioned at the downside of the projector main body (11), the angle adjustment plate (13) links to each other with the support horizontal axis (14), and the support horizontal axis (14) and the support vertical axis ( 15) are connected, and the support vertical axis (15) stands on the ground; adjust the angle of the projector main body (11) relative to the support longitudinal axis (15) through the angle adjustment plate (13), and adjust the projector main body through the angle adjustment plate (13) (11) relative to the length of the support horizontal axis (14), the center of the projection image optical path (3) projected by the projection lens (12) on the projection device (1) coincides with the center of the double helix screen (2); The double-helix screen (2) includes: a main body (21), a support shaft (22), a cylindrical imaging area (23), a circular surface looking down (24) and a rotation axis (25), and the double-helix screen (2) It is a double helical curved screen, and the double helical curved screen is symmetrical about the center of the support shaft (22), and is located below the projection device (1), the main body (21) is supported by the support shaft (22), and the circular surface (24) is about The rotation axis (25) is symmetrical to the center, and the rectangular image surface (32) at the lower end of the optical path is inscribed in the double helix screen overlooking the circular surface (24); During imaging, the main body (21) rotates to form a cylinder imaging area (23) with the circular surface (24) as the bottom surface and the rotation axis (25) as the height; The optical path offset angle of the projector main body (11) is parallel to the angle adjustment plate (13); the projector main body (11) is tilted at a certain angle, and the relative distance between the projection device (1) and the double helix screen is adjusted simultaneously, so that The central ray (33) is perpendicular to the rectangular image surface (32) at the lower end of the optical path, so that the rectangular image surface (32) at the lower end of the optical path is inscribed on the circular surface (24) of the double-helix screen, so that the projection device (1) The center of the projection image optical path (3) projected by the projection lens (12) coincides with the center of the cylinder imaging area (23).

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