TWI723836B - Optical projection system - Google Patents

Abstract

An optical projection system including a projection module, a first mirror, a projection screen and a pyramidal reflector is provided. The projection module is configured to project an image beam. The first mirror has a central axis. The image beam is sequentially projected to a user through the first mirror, the projection screen and the pyramid reflector, so that the user views a stereoscopic image. The projection module is rotated around the central axis of the first mirror, so that the user views the stereoscopic image at different angles around the central axis of the first mirror.

Description

Optical projection system

The present invention relates to an optical system, and particularly relates to an optical projection system.

At present, the stereo projection system on the market mainly uses an inclined semi-transmissive semi-reflective film to project an image to the user. If you want to generate a 360-degree surround stereo image, you must project the corresponding images in the front, back, left, and right, so you must use multiple projection systems at the same time.

Furthermore, the current mass-produced large-size screens are about 85 inches in maximum, which is still not big enough for a concert stage. In addition, multiple screens are required to produce a 360-degree surround three-dimensional image.

The present invention provides an optical projection system, which can present a 360-degree surround three-dimensional image with a simple optical system.

An embodiment of the present invention provides an optical projection system, which includes a projection module, a first mirror, a projection screen, and a pyramid reflector. Projection mode The group is used to project an image beam. The first reflecting mirror has a central axis. The image beam is projected to a user through the first reflector, the projection screen, and the pyramid reflector in sequence, so that the user can view a three-dimensional image. The projection module rotates around the central axis of the first reflector, so that the user can view the three-dimensional image at different angles around the central axis of the first reflector.

In an embodiment of the present invention, the above-mentioned first reflecting mirror is conical, and the reflecting surface of the first reflecting mirror is axially symmetric with respect to the central axis.

In an embodiment of the present invention, the above-mentioned first reflector is pyramidal. The reflecting surface of the first reflecting mirror is rotationally symmetric with respect to the central axis.

In an embodiment of the present invention, the above-mentioned projection module includes a second reflecting mirror to reflect the image beam to the first reflecting mirror, wherein the second reflecting mirror rotates around the central axis of the first reflecting mirror.

In an embodiment of the present invention, the above-mentioned pyramidal reflector is a semi-transmissive semi-reflector.

In an embodiment of the present invention, the central axis of the above-mentioned pyramidal reflector coincides with the central axis of the first reflector.

In an embodiment of the present invention, the reflecting surface of the aforementioned pyramid reflector is rotationally symmetric with respect to the central axis of the pyramid reflector.

In an embodiment of the present invention, the above-mentioned image beam forms a scan line on the projection screen.

In an embodiment of the present invention, it further includes a sensor, wherein a mark is provided on the reflecting surface of the first reflecting mirror or on the projection screen. The optical projection system is based on the projection The rotation rate of the projection module is calculated by the time of sensing the mark for each rotation of the module.

In an embodiment of the present invention, when the projection rate and the rotation rate of the image beam projected by the projection module are different, the optical projection system adjusts the projection rate or the rotation rate of the projection module, wherein the projection rate is the projection formed by the image beam The number of frames per second of the screen.

Based on the above, in the optical projection system of the embodiment of the present invention, since the projection module rotates around the central axis of the first reflector, the user can view the three-dimensional image at different angles around the central axis of the first reflector. Therefore, a 360-degree surround three-dimensional image can be generated without using multiple optical projection systems.

100, 100’: Optical projection system

110, 110’: Projection module

112: second mirror

120, 120’: The first mirror

120C: central axis

120S: space

121, 121’, 141: reflective surface

130: projection screen

140: Pyramid reflector

140C: Central axis

150: Sensor

A: area

B: image beam

L: scan line

M1, M2: mark

FIG. 1 is a three-dimensional schematic diagram of an optical projection system according to an embodiment of the present invention.

2 is a schematic cross-sectional view of an optical projection system according to an embodiment of the invention.

3 is a schematic cross-sectional view of another optical projection system according to an embodiment of the present invention.

Fig. 4 is a bottom view of the conical shape of the first reflecting mirror of the embodiment of the present invention.

Fig. 5 is a bottom view of a pyramid of the first reflecting mirror of the embodiment of the present invention.

FIG. 1 is a three-dimensional schematic diagram of an optical projection system according to an embodiment of the present invention. 2 is a schematic cross-sectional view of an optical projection system according to an embodiment of the invention. 1 and 2 at the same time, an embodiment of the present invention provides an optical projection system 100, which includes a projection module 110, a first mirror 120, a projection screen 130, and a pyramid reflector 140.

In this embodiment, the projection screen 130 is disposed between the first mirror 120 and the pyramid reflector 140. The first reflecting mirror 120 has a central axis 120C. The reflecting surface 121 of the first reflecting mirror 120 surrounds its central axis 120C. A space 120S is defined between the reflecting surface 121 of the first reflecting mirror 120 and the projection screen 130.

In order to make the projection effect better and give users a good experience, in this embodiment, the central axis 140C of the pyramid reflector 140 is preferably coincident with the central axis 120C of the first reflector 120, and the projection screen 130 It is set to be perpendicular to the central axis 120C.

In addition, the projection module 110 of this embodiment is arranged in the space 120S. The projection module 110 is used to project an image beam B. Since the image light beam B can have an angle, and for the convenience of description, the area A in FIGS. 1 and 2 illustrates the projection range that the image light beam B can have. In this embodiment, the image beam B is projected to a user through the first reflector 120, the projection screen 130, and the pyramid reflector 140 in sequence, so that the user can view a three-dimensional image.

In this embodiment, the pyramid reflector 140 may be a semi-transmissive semi-reflector. In other words, in addition to viewing the three-dimensional image formed by the image beam B, the user In addition, users can also watch the background image. Therefore, the optical projection system 100 of this embodiment can allow users to have a better viewing effect. In an embodiment, the pyramid reflector 140 may also be a complete reflector. Furthermore, the reflecting surface 141 of the pyramid reflector 140 is rotationally symmetric with respect to the central axis 140C of the pyramid reflector 140. In FIG. 1, the pyramid reflector 140 is a quadrangular pyramid as an example, that is, the bottom surface of the pyramid reflector 140 is a quadrangular shape, and the four side surfaces are triangular. However, the present invention is not limited to this, and the shape of the bottom surface of the pyramid reflector 140 should be determined according to usage requirements. The bottom surface of the pyramid reflector 140 may be triangular, quadrangular or other polygonal shapes.

Furthermore, in this embodiment, the projection module 110 rotates around the central axis 120C of the first reflector 120, so that the user can view the three-dimensional image at different angles around the central axis 120C of the first reflector 120. In order to reduce the impact of the projection effect of the image beam B on the rotation of the projection module 110, the projection module 110 is preferably arranged on the central axis 120C of the first mirror 120.

In addition, in order to make the image beam B projected by the projection module 110 consistent with the image of the image beam B projected after one rotation, the image beam projected by the projection module 110 of the embodiment of the present invention The projection rate of B needs to be consistent with the rotation rate of the projection module 110.

In detail, the optical projection system 100 of the embodiment of the present invention further includes a sensor 150. The sensor 150 rotates with the rotation of the projection module 110, wherein a mark M1 is provided on the reflective surface 121 of the first reflector 120 or a mark M2 is provided on the projection screen 130. The optical projection system 100 calculates the rotation rate of the projection module 110 according to the time of sensing the mark M1 or M2 for each rotation of the projection module 110. That is In other words, when the image beam B is transmitted along its optical path, part of the reflected light will be received by the sensor 150 along the optical path opposite to the image beam B. When the image beam B passes through the position where the mark M1 or M2 is located, the sensor 150 can sense the mark M1 or M2. Therefore, the rotation rate of the projection module 110 can be calculated according to the time difference between every two times the same mark M1 or M2 is sensed.

Furthermore, the projection range of the image beam B is indicated by area A. Specifically, the image beam B can form a scan line L on the projection screen 130. When the projection module 110 rotates, the scan line L rotates accordingly so that the user can view the three-dimensional image at different angles. The rate at which the projection beam B scans a complete three-dimensional image through the scanning line L can be the number of frames per second (Frames per Second, FPS) of the projection screen formed by the image beam B, that is, the projection rate. In this embodiment, when the projection rate and the rotation rate of the image beam B projected by the projection module 110 are different, the optical projection system 100 adjusts the projection rate or the rotation rate of the projection module 110. Therefore, the optical projection system 100 of the embodiment of the present invention can maintain the projection effect well.

Based on the above, in the optical projection system 100 of the embodiment of the present invention, since the projection module 110 rotates around the central axis 120C of the first reflector 120, the user is different from the central axis 120C of the first reflector 120. A three-dimensional image can be viewed from an angle. Therefore, a 360-degree surround three-dimensional image can be generated without using multiple optical projection systems 100.

3 is a schematic cross-sectional view of another optical projection system according to an embodiment of the present invention. Please refer to FIG. 3, in an embodiment, the projection module 110' includes a second reflector 112 to reflect the image beam B onto the first reflector 120, wherein the first reflector 120 The second reflector 112 rotates around the central axis 120C of the first reflector 120, so that the user can view the three-dimensional image at different angles around the central axis 120C of the first reflector 120. In addition, the sensor 150 does not rotate as the second mirror 112 rotates. Since the optical projection system 100' is designed to rotate the second mirror 112, the projection image of the optical projection system 100' is more stable, and the user has a better experience.

Fig. 4 is a bottom view of the conical shape of the first reflecting mirror of the embodiment of the present invention. Fig. 5 is a bottom view of a pyramid of the first reflecting mirror of the embodiment of the present invention. Please refer to FIG. 4 first. In one embodiment, the first reflector 120 has a cone shape, and the reflecting surface 121 of the first reflector 120 is axisymmetric with respect to the central axis 120C. Please refer to FIG. 5, in another embodiment, the first reflector 120' has a pyramid shape. The reflecting surface 121' of the first reflecting mirror 120' is rotationally symmetric with respect to the central axis 120C.

Based on the above, the first reflector 120, 120' of the embodiment of the present invention may be conical or pyramidal. However, in order to enable the projection effect to be presented in a better manner, the geometric shape of the first reflector 120, 120' preferably matches the geometric shape of the pyramid reflector 140. For example, FIG. 5 illustrates the first reflector 120 in a quadrangular pyramid. Therefore, as shown in FIG. 1, the pyramid reflector 140 is preferably also a quadrangular pyramid.

In summary, in the optical projection system of the embodiment of the present invention, since the projection module rotates around the central axis of the first reflector, the user can see from different angles around the central axis of the first reflector Three-dimensional images, therefore, a 360-degree surround three-dimensional image can be generated without using multiple optical projection systems. Furthermore, the geometric shape and geometric size of the first reflector or pyramid reflector can be designed according to user needs. Therefore, even in the environment of a concert stage, the optical projection of the embodiment of the present invention The shadow system can still produce good projection effects.

100: Optical projection system

110: Projection module

120: first mirror

120C: central axis

120S: space

121, 141: reflective surface

130: projection screen

140: Pyramid reflector

140C: Central axis

150: Sensor

A: area

B: image beam

L: scan line

M1, M2: mark

Claims (10)

An optical projection system includes: a projection module for projecting an image beam; a first reflector with a central axis; a projection screen; and a pyramid reflector; wherein the image beam sequentially passes through the The first reflector, the projection screen, and the pyramid reflector are projected to a user so that the user can view a three-dimensional image. The projection module rotates around the central axis of the first reflector to make the user The three-dimensional image is viewed at different angles around the central axis of the first mirror. The optical projection system according to claim 1, wherein the first reflecting mirror is conical, and the reflecting surface of the first reflecting mirror is axially symmetric with respect to the central axis. The optical projection system according to claim 1, wherein the first reflecting mirror is a pyramid shape, and the reflecting surface of the first reflecting mirror is rotationally symmetric with respect to the central axis. The optical projection system according to claim 1, wherein the pyramid reflector is a semi-transmissive semi-reflector. The optical projection system according to claim 1, wherein the central axis of the pyramid reflector coincides with the central axis of the first reflector. The optical projection system according to claim 5, wherein the reflecting surface of the pyramid reflector is rotationally symmetric with respect to the central axis of the pyramid reflector. The optical projection system according to claim 1, wherein the image beam forms a scan line on the projection screen. The optical projection system according to claim 1, further comprising: a sensor arranged on the projection module, wherein a mark is provided on the reflecting surface of the first reflecting mirror or on the projection screen, the optical projection system The rotation rate of the projection module is calculated according to the time when the mark is sensed for each rotation of the projection module. The optical projection system according to claim 8, wherein when the projection rate of the image beam projected by the projection module is different from the rotation rate, the optical projection system adjusts the projection rate or the rotation rate of the projection module, wherein the The projection rate is the number of frames per second of the projection screen formed by the image beam. An optical projection system includes: a projection module for projecting an image beam; a first reflector with a central axis; a projection screen; and a pyramid reflector; wherein the image beam sequentially passes through the The first reflector, the projection screen, and the pyramid reflector are projected to a user so that the user can view a three-dimensional image. The projection module includes a second reflector to reflect the image beam to the On the first reflector, the second reflector rotates around the central axis of the first reflector, so that the user can view the three-dimensional image at different angles around the central axis of the first reflector.

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