JPH0238256Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications This invention relates to glasses for stereoscopic vision.

BACKGROUND TECHNOLOGY AND PROBLEMS There are 3D display systems using polarized light as shown in FIGS. 1 and 2. That is, as shown in FIG. 1, linear polarizers (Polaroid polarizing plates) 2L and 2R are arranged in front of the projection lenses 1L and 1R of the projector so that their planes of polarization are orthogonal to each other, and the screen 3 is As shown by the solid line in Figure 2, this image is
The frame 4 is provided with similar polarizers 5L and 5R, and is viewed through glasses 6.

Compared to the polarization shutter method, this method does not cause flickering or image coloration, and can provide a good stereo effect.

However, in this method, the polarizers 5L,
Azimuth angle A゜ with 5R predetermined (for left eye)
and (A+90)° (for the right eye), the orthogonal state is reached for the first time and a preferable stereoscopic vision state can be obtained. According to one theory, the transmittance (wide-range parameter) of visible light at orthogonality K _VX is K _VX = ∫Fa (λ) Fb (λ) K ₁ (λ) K ₂ (λ) / ∫Fa (λ) Fb
It is analyzed that when (λ)dλ, K _VX ≦0.002.

Despite these strict conditions, various limitations such as the performance of the inexpensive Polaroid type polarizing plate, misalignment when the glasses are finished, and the reflective material of the screen 3 do not satisfy the above values.
Moreover, in most cases, spectators are observed to tilt their heads to the left or right, as shown by the broken line in Figure 2, and actual measurements show that this tilt reaches as much as ±10°.
As is clear from Figure 3, this shows that the transmittance
This means a deterioration of K _VX , which in turn means an increase in crosstalk between left and right images.

It has been considered to use a circular polarizer to correct this head tilt, but it is extremely difficult to make the image colorless using a circular polarizer.

Purpose of the invention This invention aims to solve these problems.

Summary of the invention Therefore, in this invention, the left and right polarizers are composed of linear polarizers, and the polarizers are rotatably supported on a frame so that the direction of the plane of polarization is always constant due to gravity. It is something to do.

Embodiment In FIG. 4, reference numeral 11 indicates a frame made of, for example, a plastic material, which is formed in, for example, a U-shape when viewed from above, and legs 11L and 11R on both sides thereof are used as ear hooks. In addition, left and right linear polarizers 12 are provided in the central portion 11A.
L and 12R are provided.

In this case, the polarizers 12L and 12R have their polarization planes perpendicular to each other as shown by arrows 13L and 13R, and the polarizer 2 of the projector (FIG. 1)
The directions correspond to L and 2R. and,
The upper ends of the polarizers 12L, 12R are mounted by pivots 14L, 14R at positions corresponding to both eyes in the central portion 11A of the frame 11.
The polarizers 12L, 12R are rotatably supported in the plane thereof, and counterweights 15L, 15R made of lead or the like are attached to the lower ends of the polarizers 12L, 12R. Note that 16L and 16R indicate guides, which prevent the polarizers 12L and 12R from swinging in directions other than their rotation directions.

According to such a configuration, even if the glasses are tilted as shown in FIG.
The direction of 3R does not change from the horizontal case. Therefore, even if the viewer tilts his head, he can view a 3D image without crosstalk. In addition, the polarizer 12
Since linear polarizers are used as L and 12R, the image is not colored. Furthermore, the configuration is simple and inexpensive.

In addition, the polarizer 2L of the projector (Fig. 1),
If 2R has a similar configuration, it will be vibration resistant, and there will be no need for special angle adjustment. Furthermore, if the screen is dome-shaped and looks up, it may be rotated by a motor or the like based on guide light, earth's magnetism, or the like.

Effects of the invention Crosstalk caused by observer's head movements has been eliminated. As a result, a stereoscopic image could be captured in the left and right eyes as initially set, and a good stereoscopic effect was obtained. In addition, an inexpensive version with only a pivot and a weight can be provided in place of the conventional cardboard lamination type. Furthermore, the audience can watch the movie in a relaxed manner, which is a great benefit.

[Brief explanation of drawings]

1 to 3 and 6 are diagrams for explaining this invention, FIG. 4 is a rear view of an example of this invention, and FIG. 5 is a side view thereof. 12L, 12R are linear polarizers, 14L, 14R
is the pivot, and 15L and 15R are the counterweights.

Claims (1)

[Scope of utility model registration request] The left and right polarizers are constituted by linear polarizers, and are rotatably supported with respect to the frame by a pivot, and the polarizers are arranged such that the direction of the plane of polarization is constant. Stereoscopic glasses that are provided with a counterweight that is rotated by gravity around the pivot.