JPH0515042U - Stereoscopic image projector - Google Patents

Abstract

(57) [Abstract] [Purpose] By realizing the image for the left eye and the image for the right eye by a single projection device, it is possible to omit the adjustment of the projection angle and the trouble of synchronizing the projection devices. A stereoscopic image projection device capable of performing the above is provided. [Structure] The image film 2 is composed of left-eye and right-eye images, and polarizing plates 3-L for light transmitted through the left-eye image film 2-L and the right-eye image film 2-R, respectively. 3-R are provided so that their polarization axes are different, and the birefringent plate 4 matches the light traces of the left-eye and right-eye images.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stereoscopic image projection device that projects a stereoscopic image using polarized light.

[0002]

[Prior Art]

 2. Description of the Related Art In recent years, a technique for three-dimensionally displaying a planar image has been actively used. By giving a three-dimensional effect, the image becomes powerful and realistic in the artistic field, and in the industrial field, it is possible to accurately perform the work that requires the three-dimensional feeling. Let By the way, humans perceive a stereoscopic effect by the parallax that occurs when they see an object with both eyes. In other words, the stereoscopic effect is recognized based on the difference between the image obtained with the left eye and the image obtained with the right eye. Based on this principle, a stereoscopic image projection device configured as described below is known. FIG. 2 is a plan view showing the configuration of a conventional stereoscopic image projection apparatus. In this figure, 10-L and 10-R are projection devices, the projection device 10-L provides an image for the left eye via the polarizing plate 11-L, and the projection device 10-R has a polarizing plate 11-L. Images for the right eye are projected on the screen 12 via R respectively.

At this time, the projected images for the left eye and the right eye respectively correspond to the images obtained when viewed with a single eye, and the polarizing plate 12-L is a left-handed circularly polarized light. The polarizing plate 12-R is arranged so as to be polarized to the right-handed circularly polarized light. Further, the surface of the screen 12 is subjected to a treatment for maintaining the polarization, and the image is projected while the polarization state is maintained. The angles of the projection devices 10-L and 10-R are set so as to correspond to the parallax of both eyes.

Next, the operation of the apparatus configured as described above will be described. The observer wears a polarizing eyeglass and observes the image projected on the screen 12. In this polarized glasses, a left-handed circularly polarizing plate is used for the left eye and a right-handed circularly polarizing plate is used for the right eye. Therefore, the observer cannot see the image for the right eye with the left eye, and can see only the image for the left eye. Similarly, the left eye cannot see the left eye image with the right eye, but only the right eye image. As described above, the observer sees the image projected on the screen 12 with the left and right eyes and only the images corresponding to each eye, so that the viewer feels parallax as if he or she saw a real three-dimensional object. , You can observe the projected image with a three-dimensional feeling, just as you would see it with the naked eye.

[0005]

[Problems to be solved by the device]

 However, in the apparatus configured as described above, the image for the left eye and the image for the right eye are projected by the independent projection apparatuses 10-L and 10-R, so that the projection angle of Must be adjusted to accommodate line of sight. Further, in the case of projecting a moving image, the projection apparatuses 10-L and 10-R have to project the corresponding projections at the same time, and therefore it is necessary to synchronize the both projection apparatuses. However, it is very difficult to achieve such synchronization. The present invention has been devised in view of the above circumstances, and the purpose thereof is to realize the adjustment of the projection angle by realizing the image for the left eye and the image for the right eye with one projection device. An object of the present invention is to provide a stereoscopic image projection device that can omit the trouble of synchronizing the projection devices.

[0006]

[Means for Solving the Problems]

 This invention comprises an image film composed of left-eye and right-eye images, and the polarization axes for the light passing through the left-eye and right-eye image films as described above for the left-eye and right-eye images. It is characterized by comprising polarizing plates arranged differently in the image and a birefringent plate for matching the light traces of the left-eye image and the right-eye image.

[0007]

[Action]

 According to the above configuration, the image for the left eye and the image for the right eye are projected by one projection device, and the polarization states of the respective images projected on the screen are different.

[0008]

【Example】

 An embodiment according to the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing the structure of a stereoscopic image projection apparatus according to the present invention. In this figure, 1 is a light source and 2 is an image film. The image film 2-L for the left eye and the image film 2-R for the right eye are separately divided and accommodated in one frame of the image film 2, and when each is viewed by a single eye. It corresponds to the obtained image. Further, in this figure, 3 is a linear polarizing plate, which is constituted by 3-L and 3-R so as to correspond to the image film 2, and the polarization of the linear polarizing plates 3-L and 3-R is shown. The axes are formed so as to be orthogonal to each other. The birefringent plate 4 has a different refractive index of transmitted light depending on the polarization state (optical anisotropy). Lights that have passed through the linear polarizing plates 3-L and 3-R have different polarization states, and therefore have different refractive indexes in the birefringent plate 4. Due to the relationship between the refractive index and the angle of incidence, the birefringent plate 4 is slightly opposed to the image film 2 so that the light transmitted through the linear polarizing plates 3-L and 3-R will be emitted at the same point. It is placed at an angle. The lens 5 magnifies the image on the screen 12. The screen 12 has the same properties as the conventional example.

Next, the operation of the embodiment configured as described above will be described. First, the light emitted from the light source 1 is transmitted through the image films 2-L and 2-R to become left-eye and right-eye image lights, which are polarized by the polarizing plates 3-L and 3-R, respectively. The image light for the left eye and the image light for the right eye that have passed through the polarizing plate 3 enter the points a and b of the birefringent plate 4, respectively. In this case, the left-eye image light and the right-eye image light are in a polarization state in which the polarization axes are orthogonal to each other, and therefore have different refractive indexes when passing through the birefringent plate 4, and the birefringent plate 4 is inclined. Since they are arranged in the same manner, they are emitted at the same point c.

After that, the image light for the left eye and the image light for the right eye emitted from point c are magnified by the lens 5 and projected on the screen 12 as images for the left eye and the right eye. An observer wears polarizing glasses to observe these two images as in the conventional example. In this polarizing eyepiece, the polarization characteristic of the polarizing plate of the left eye matches that of the polarizing plate 3-L, and the polarization characteristic of polarization of the right eye matches that of the polarizing plate 3-R. By wearing the polarized glasses, the observer cannot see the image for the right eye with the left eye, and can see only the image for the left eye. Similarly, the right eye cannot see the image for the left eye, only the image for the right eye. Therefore, the image projected on the screen 12 can be viewed three-dimensionally.

Although linearly polarized light by the polarizing plate 3 is used in the above embodiment, circularly polarized light may be used. In this case, if a quarter-wave plate is inserted between the birefringent plate 4 and the lens 5 or between the lens 5 and the screen 12, a left-eye image and a right-eye image projected on the screen 12 are displayed. An image is a circularly polarized state in which the directions of rotation are different from each other. In order to observe both images, the left eye uses a left-handed circularly polarizing plate and the right eye uses a right-handed circularly polarizing plate for observing both images.

[0012]

[Effect of the device]

 As described above, according to the present invention, the image for the left eye and the image for the right eye are projected by one projection device, so that the trouble of adjusting the projection angle and synchronizing between the projection devices is omitted. can do.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment according to the present invention.

FIG. 2 is a plan view showing a configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 light source 2 image film 3, 11 polarizing plate 4 birefringent plate 5 lens 10 projection device 12 screen

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazushige Kitachi 100 Takegahana-cho, Ise-shi, Mie Shinko Electric Co., Ltd. (72) Inventor Hisashi Onishi 100 Takegahana-cho, Ise-shi, Mie Shinko Electric Co., Ltd. In Ise factory

Claims (1)

[Scope of utility model registration request] 1. An image film is composed of left-eye and right-eye images, and the polarization axes for light transmitted through the left-eye and right-eye image films are the left-eye and right-eye images. And a birefringent plate that makes the light traces of the left-eye and right-eye images coincide with each other.