JPS61105501A - Lens for stereoscopic display - Google Patents

Abstract

PURPOSE:To obtain a large-sized lens for stereoscopic display easily and relatively inexpensively by forming the first lens body, where concave lens parts and plane parts are arranged alternately and continuously, and the second lens body, where concave lens groups including plural small concave lenses and plane parts are arranged alternately and continuously, on both faces of a lens substrate. CONSTITUTION:A lens substrate 1 is formed with two transparent plane plates 2 and 3 arranged in parallel. Columnar concave lens parts 4 and stripe-shaped plane parts 5 are arranged alternately at a prescribed pitch on the upper face of the lens substrate 1 to form the first lenticular lens body. Concave lens groups 7 each of which includes three columnar small concave lenses 6 narrower than concave lens parts 4 and stripe-shaped plane parts 8 are arranged alternately at a prescribed pitch to form the second lenticular lens body.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a stereoscopic display lens for displaying a two-dimensional image three-dimensionally.

(Prior art) Conventionally, the problem of stereoscopic viewing of a flat image is that a three-dimensional effect can be obtained by viewing two flat images with one eye separately, with viewing angles that differ to the same extent as the left and right eyes of a person. However, such a method required two different plane images, and it was impossible to obtain stereoscopic vision with one plane image. Examples of systems that enable stereoscopic display using images include:
Various methods using the lenticular method have been proposed.

(Problems to be Solved by the Invention) However, since this type of stereoscopic image using the lenticular method is a continuous array of fine lenticular shaped lenses, it requires a lot of money to manufacture it. This made the mold extremely difficult to manufacture, which not only hindered cost reduction, but also made it impossible to create lenses for stereoscopic displays on large screens that were highly practical. Furthermore, since the structure is formed of microlenses and has parallax on a pixel-by-pixel basis, it is difficult to obtain the large parallax necessary for stereoscopic viewing of groups of pixels that are large enough to be visually discernible. It was restricted.

The present invention has been made with attention to these points, and enables the enlargement of a stereoscopic display lens by facilitating mold production and providing a large parallax.

It is an object of the present invention to provide a stereoscopic display lens that can be supplied at a relatively low cost.

(Means for Solving the Problems) Therefore, in the present invention, the stereoscopic display lens is a first lens in which concave lens portions and flat portions are alternately and continuously arranged on one surface of a lens substrate made of a transparent flat plate. forming a second lens body in which concave lens groups including a plurality of small concave lenses and flat parts are alternately and continuously arranged on the other surface;
It was constructed by Nyo.

(Function) With this configuration, the lens for stereoscopic display of the present invention can obtain a large parallax necessary for stereoscopic viewing of a pixel group with a size that can be visually discerned, and furthermore, the lens for stereoscopic display of the present invention can be manufactured Since the mold for this purpose is very easy to manufacture, it is possible to provide large stereoscopic display lenses easily and at a relatively low cost.

(Example) Next, an example of implementation of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 3 are perspective views showing an example of implementation of a stereoscopic display lens according to the present invention. Figures 1 and 2
In the figure, 1 is a lens substrate, which is formed by two transparent flat plates 2 and 3 arranged in parallel. On the upper surface of this lens substrate 1, cylindrical concave lens portions 4 and strip-shaped flat portions 5 are alternately arranged at a predetermined pitch to form a lenticular first lens body. Further, on the lower surface of the lens substrate 1, a concave lens group 7 including three small cylindrical concave lenses 6 narrower than the concave lens part 4 and a strip-shaped flat part 8 are arranged alternately at a predetermined pitch. A second lens body having a lenticular shape is formed.

Here, in the embodiment shown in FIG. 1, the concave lens group 7 is
A small flat surface 9 in the form of a strip having a width narrower than the flat portion 8 is inserted between the cylindrical small concave lenses 6, and the width of the concave lens portion 4 of the first lens body is equal to the flat portion 5. It is set slightly wider than that of . Further, in the embodiment shown in FIG. 2, the concave lens group 7 is formed by a continuous arrangement of only the cylindrical small concave lenses 6, and the width of the concave lens part 4 and the flat part 5 of the first lens body is They are set approximately equal. Here, as in the embodiment shown in FIG. 1, better results were obtained when the width of the concave lens portion 4 in the first lens body was made slightly wider than the width of the flat portion 5. The same thing was true for the second Ken's body.

In addition, in the embodiment shown in FIG. 3, cylindrical concave lens portions 4 orthogonal to each other are arranged on the upper surface of the lens substrate 1 at a predetermined pitch with a rectangular flat portion 5 interposed therebetween, forming a mosaic shape. It forms a first lens body. On the lower surface of this lens substrate 1, a concave lens group 7 including three cylindrical small concave lenses 6 narrower than the concave lens part 4 and a strip-shaped flat part 8 are arranged alternately at a predetermined pitch to form a lenticular structure. A second lens body having the same shape as the first lens body is formed.

Next, stereoscopic viewing of one planar image using these stereoscopic display lenses will be described. Hereinafter, on the planar image G, a pixel group in which a plurality of pixels or more are gathered will be described as P, a beam of light from the pixel group P will be described as a, and the display of the pixel group on the drawing will be indicated by a single mark.

FIG. 4 is an explanatory diagram showing the optical system of the embodiment shown in FIG. 1. In this three-dimensional display lens, the first lens body is on the object side, and the plane image G is placed parallel to the lens surface at a position somewhat distant from the lens surface. When looking at the planar image G through the stereoscopic display lens in this state, the pixel groups P1 to P of the planar image G are
15, the ray flux a fi1 from pixel groups P1 to P8 is
a/, the concave lens portion 4 of the first lens body and the concave lens group 7 of the second lens body form respective optical paths including the diffused ray bundles a" and a" of the pixel groups P and P, respectively. Proceed to eye A. Therefore, the vision of eye A is 1! Virtual image groups P'1 to p7. contracted on the extension lines of a□ to a. You will see. At this time,
Two ray bundles a′3゜a from pixel groups P and P6, respectively.
", and a',, a", on the other hand, a '31 a'
$ passes from the concave lens part 4 of the first lens body to the small concave lens 6 of the second lens body, while a'3ja'@ passes from the concave lens part 4 of the first lens body to the small plane 9 of the second lens body. Since it reaches the eye A through the virtual image group, there is a slight difference in the imaging position where the virtual image group appears, and the virtual image group P', ~P'. Furthermore, changes in the sense of depth appear, which is effective when parallaxing fine images. Furthermore, the light beams a'@~a'zs from the other pixel groups Ps~P1s pass through each of the flat parts 5, 8 of the first lens body and the second lens body, so that they return to the original pixel group. P,
It will be seen with the line of sight a of eye A, ~ats, with the same shape as ~Pi.

FIG. 5 is an explanatory diagram showing the optical system of the embodiment shown in FIG. 2. When looking at a planar image G with such a stereoscopic display lens, among the pixel groups P1 to P1° of the planar image G, pixel group P~
The light beams aJ1 to a'6 from P are diffused by the concave lens portion 4 of the first lens body and the concave lens group 7 of the second lens body into the diffused light beams a"8 and a" of the pixel groups P2 and P, The virtual image group P', -p), which is contracted on the extension of the line of sight a1-a, of the eye A, is seen. In addition, ray bundles a I, ~a'8 from other pixel groups P7 to P□
．． are each plane part 5 of the first lens body and the second lens body,
8, the original pixel groups P7 to P2. It will be seen with the line of sight a, ~ais of eye A, keeping the same shape as .

Next, referring to FIG. 6, a case where binocular parallax is performed on a wide image plane will be explained using the optical system of the embodiment shown in FIG. 2. As shown in FIG. 6, if a plane portion 10 as shown in FIG. 7 is represented on the surface of the plane image G in the figure, the line of sight of one eye through the three-dimensional display lens is a1 to
Each pixel group gp of the plane portion 10 includes al, bl to b5.
hs l+ When the visual points x1 to X of both eyes are placed in the Jtk portion and viewed with lines of sight having different inclination angles, the visual acuity of the right eye at the visual points x1 to Xs of the right eye is 11Aai to a,
are the points ge h, i, J* k of each pixel group on the plane part 10
is a point in the virtual image group of space a>g't ash's ail
't a4J'ya, ni' will be highlighted and seen again.

The line of sight of left eye B at the point of view
g's bzh'v bai', b4J'+ 1)s
You will see it highlighted at k'.

In addition, when both eyes A and B are moved to the points of view X□ to
continuously moves to the right and reaches parts a, h, b, and h, and similarly moves to parts a, b, and k by changing the transparent parts. As a result, the continuous images seen by the right eye A are connected to the plane part 1 by the line 11 connecting the points a, g' to a, and ni' of each virtual image group.
It appears to stand out as an image of 0. Also, the continuous images seen from the left eye B are at points b 7' to b' of each virtual image group.
The image of the plane part 10 appears to stand out on the line 12 connecting them.

These two consecutive images can be viewed stereoscopically with binocular parallax because of the degree of contraction of the pixel group and the fact that the imaging positions in space all appear different on the left and right sides.

The two embodiments shown in one figure have been described in detail above.
The present invention is not limited to these. for example,
Not only the first lens body but also the second lens body may have a mosaic shape.

In addition, only the second lens body may have a mosaic shape. When such a mosaic-shaped lens body is used, stereoscopic vision is possible not only in the horizontal direction but also in the vertical direction. Furthermore, the lens substrate may be constituted by one transparent flat plate, and the arrangement pitch of the concave lens portions and the arrangement pitch of the concave lens groups may be different between the first lens body and the second lens body. , and again. first lens body, second lens body
Even if the depth, amplitude, radius of curvature, etc. of the groove of the concave lens portion formed on the surface of the lens body differs from one lens portion to another, it can be used to implement the present invention.

(Effects of the Invention) The present invention is constructed as described above, and includes a first lens body in which concave lens parts and flat parts are alternately and continuously arranged on both sides of a lens substrate, a concave lens group including a plurality of small concave lenses, and a flat part. Since the second lens body is formed by alternately and continuously arranging the second lens body, it is possible to obtain a large parallax necessary for stereoscopic viewing of a pixel group having a size that can be visually discerned, and further,
Since the small concave lenses that form the concave lens part and the concave lens group do not need to be microlenses, the mold for manufacturing them is very easy to manufacture, and large 3D display lenses can be produced easily and relatively quickly. The effect is that it can be provided at a low price.

[Brief explanation of drawings]

1 and 3 are perspective views showing an example of implementation of the stereoscopic display lens according to the present invention, FIGS. 4 and 5 are explanatory views showing the optical system of each of these embodiments, and FIG. FIG. 7 is an explanatory diagram showing a state of parallax between both eyes, and FIG. 7 is a plan view showing an example of a plane picture drawn on a plane image. 1... Lens substrate, 2, 3... Transparent flat plate, 4... Concave lens portion, 5, 8... Flat portion. 6...Small concave lens, 7...Concave lens group, 9...Small plane, 10...Plane image.

Claims (6)

[Claims] (1) A first lens body in which concave lens portions and flat portions are alternately and continuously arranged is formed on one surface of a lens substrate made of a transparent flat plate, and a concave lens group including a plurality of small concave lenses is formed on the other surface. A lens for stereoscopic display, characterized in that a second lens body is formed in which planar parts are alternately and continuously arranged. (2) The stereoscopic display lens according to claim (1), wherein the concave lens portion and the small concave lens are formed of lenticular lenses. (3) The concave lens group is formed by alternately and continuously arranging small concave lenses and small planes.
2) The stereoscopic display lens described in item 2). (4) The three-dimensional display lens according to claim (2), wherein the concave lens group is formed of continuous small concave lenses. (5) The three-dimensional display lens according to claim (1), wherein both or one of the concave lens portion and the small concave lens is formed of a mosaic-shaped lens. (6) Claim (1) characterized in that the lens substrate is formed of two transparent flat plates, one of which is formed with a first lens body and the other of which is formed with a second lens body. The three-dimensional display lens according to any one of items (5) to (5).