JP2011247930A - Stereoscopic glasses - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide stereoscopic glasses which allow anybody to easily observe an stereoscopic image without requiring special training, hardly let a user have fatigue of eyes and feel sick during observation, are less affected by the inclination of the user's face and the glasses, allow the user to observe a stereoscopic image in natural colors in a wider visual field than that obtained according to the interval between the user's eyes, can be applied to any one of projection, a display device, a printed matter or the like, can be inexpensively manufactured with a simple structure and can be used conveniently.SOLUTION: The stereoscopic glasses have two convex Fresnel lenses which do not include the optical axis within effective surfaces. The lenses are disposed side by side with each optical axis being outwardly disposed.

Description

  The present invention relates to stereoscopic glasses used for observing a stereoscopic image by observing a left-eye image and a right-eye image that are spaced apart from each other on the same plane with the left eye and the right eye, respectively.

  As is well known, the human eye can stereoscopically observe a three-dimensional observation object because the left eye and the right eye of the human being are separated by a certain distance from side to side. This is because the image when viewed with the right eye is different.

  Using this principle in reverse, the object to be observed is taken from a position that is exactly the distance between the human left eye and right eye to obtain a left eye image and a right eye image, and these are used for the left eye by some method. If the image for the right eye is viewed at the same time in the right eye, it is as if the object to be observed exists in a three-dimensional shape even though it is actually two plane images. It is possible to observe an image having a stereoscopic effect (stereoscopic image).

  The simplest method for observing a stereoscopic image based on this principle is to place the left-eye image obtained as described above in front of the left eye and the right-eye image in front of the right eye. This is a method for simultaneously viewing the right-eye image for the image for the right eye.

  However, since this method is an observation method against the physiological action of the human eye, certain special training is necessary to be able to observe a good stereoscopic image with this method. In some cases, it is impossible to observe a stereoscopic image even by training.

  Even if a stereoscopic image can be observed by training, if the observation is continued for a long time, the eyes may become tired or feel uncomfortable.

  Furthermore, since the left-eye image and the right-eye image need to be placed at positions that are separated from each other by the distance between the left eye and the right eye, the size of the observable image is inevitably the same as the left eye and the right eye. Therefore, it is impossible to observe a stereoscopic image with a wide field of view.

  In order to overcome these problems and enable anyone to observe stereoscopic images without special training, if the observer is observing normally without special measures, the left eye Several types of spectacles with special optical characteristics have been proposed so that only the right-eye image can be observed with the right-eye image.

  The simplest of these is glasses with red and blue (or green) color filters fitted to the left and right.

  This is to obtain a left-eye image and a right-eye image by shooting with red and blue (or green) light respectively from a position separated by a distance between the left eye and the right eye, and printing, projecting, or displaying an image obtained by superimposing these images. An image can be observed in three dimensions when observed with the above-mentioned glasses. It is called anaglyph and has been used for a long time (see Patent Document 1).

  However, this method is basically limited to monochrome images, and some color expression is possible by devising the spectral transmission characteristics of each color filter, but the color balance is greatly lost and natural color expression is achieved. Is impossible.

  Further, instead of simple color filters of two colors of red and blue (or green), by using a color filter in which each wavelength region of red, green and blue is further divided into two and distributed to the left and right, Some have made natural color expression possible. However, this requires a special multilayer interference filter that is manufactured by repeating a precision thin film forming process such as vacuum deposition or sputtering many times, so that glasses are extremely expensive.

  As a device capable of observing a natural color stereoscopic image using cheaper glasses, there is one using a polarizing filter.

  This is because the image for the left eye and the image for the right eye taken from the position separated by the distance between the left eye and the right eye are projected on the same projection screen by polarized light (linearly polarized light) whose polarization planes are orthogonal to each other, and these are polarized with each other. Observation is carried out with spectacles in which polarizing plates having orthogonal planes are arranged on the left and right (see Patent Document 2).

  However, this method requires observation with the polarization planes of the polarized light used for the projection of the left-eye image and the right-eye image and the right and left polarizing plates of the glasses accurately matched, and the face and glasses are tilted. However, there is a difficulty that a normal stereoscopic image cannot be observed.

  Some of them use left-handed and right-handed circularly-polarized light instead of linearly-polarized light. According to this, normal stereoscopic images can be observed even when the face or glasses are tilted. Due to the dependence, it is slightly inferior in terms of natural color expression.

  In addition, regardless of whether it is linearly polarized light or circularly polarized light, the method using polarized light is essentially limited to the projection method, and it is necessary to completely synchronize and project the two projectors. There are difficulties in terms of equipment and projection technology, as well as restrictions that cannot be applied to general display devices other than the projection system (for example, cathode ray tubes, liquid crystal display devices, plasma display devices, EL display devices, etc.) and printed matter. There is also.

  Instead of showing the left eye image and the right eye image simultaneously to the left eye and the right eye, the left eye image and the right eye image are alternately displayed at a fixed time interval (several tens of milliseconds) using the afterimage effect of the human eye. There is also a method of observing a stereoscopic image using liquid crystal shutter glasses in which a liquid crystal shutter is driven so that projection or display is performed and the left and right are alternately shielded in synchronization with this (see Patent Document 3).

  According to this method, it can be applied not only to projection but also to general display devices, and there is an advantage that there is no problem in terms of natural color expression, and the tilt of the face and glasses is not a problem. And a special device to synchronize with the image is necessary, which makes the system very expensive overall, and because the light usage efficiency is low, the image tends to become darker and brighter. When trying to obtain an image, there is a drawback that energy is wasted.

Utility Model Registration No. 313371 Microfilm of Japanese Utility Model No. 60-11116 (Japanese Utility Model Publication No. 62-19620) Japanese Patent Laid-Open No. 11-95186

  The present invention solves the above-mentioned problems in conventional stereoscopic glasses, and anyone can reasonably observe a stereoscopic image without the need for special training, and is less likely to become tired or unwell during observation, The effect of tilting of the face and glasses is small, and it is possible to observe natural color stereoscopic images with a wide field of view exceeding the distance between the left and right eyes, and it can be applied to any projection, display device, printed matter, etc. An object of the present invention is to provide stereoscopic glasses that can be manufactured inexpensively with a configuration and can be used easily.

As means for solving the above-described problems, the present invention has two convex Fresnel lenses that do not include the optical axis of the lens in the effective plane, and are arranged side by side with the optical axis side of each lens facing outside. Stereoscopic glasses characterized by this.

  The stereoscopic eyeglasses of the present invention have two convex Fresnel lenses that do not include the optical axis of the lens in the effective plane, and the optical axis side of each lens is outside, that is, the convex Fresnel lens for the left eye has its optical axis. The convex Fresnel lens for the right eye is further arranged on the left and right sides of the effective field of view so that the optical axis is on the right side of the effective field of view. ing.

  Therefore, when the observer wears the stereoscopic glasses and sees the distance far ahead, the line of sight of the left eye going forward from the left eye is placed in front of the left eye, and the optical axis is further to the left of the left end of the effective visual field of the left eye The right eye's line of sight refracted by the left-eye convex Fresnel lens at the right side toward the front left side, while moving from the right eye to the front side, is arranged in front of the right eye, and the optical axis is further to the right side than the right end of the effective visual field of the right eye The light is refracted by the right-eye convex Fresnel lens and goes to the front right side.

  Therefore, an image for the left eye obtained by photographing the same observation object from the position of the left eye and an image for the right eye obtained by photographing from the position of the right eye are respectively arranged at positions ahead of the eyes of the left and right eyes. For example, out of the left-eye image and the right-eye image that are spaced apart on the left and right on the same plane, the left-eye image is the left-eye image, the right-eye image is the right-eye image, and each image is centered on the left and right. It can be observed naturally without difficulty as if it were placed in a position.

  As a result, for the observer, the same image as seen from the position of the left eye in the left eye is observed from the position of the left eye, and the same image is viewed from the position of the right eye in the right eye. The same image that is seen is observed, and therefore, the same visual state is realized as when the object is actually observed in the center of the left and right without observing stereoscopic glasses. The object to be observed is perceived as if the object to be observed is actually present, thereby enabling observation of a stereoscopic image.

  According to this stereoscopic glasses, the observer does not have to observe the eyes of the left and right eyes to the left and right, and only observes in the same manner as when viewing an object, except for wearing stereoscopic glasses. Because it is good, anyone can reasonably observe stereoscopic images without the need for special training for observation, and it is compared with an observation method in which the eyes of the left and right eyes are forcibly separated from each other by the efforts of the observer. For example, significant eye fatigue, headache, and nausea caused by excessive eye usage can be greatly reduced.

  In addition, because the left and right images are placed at the positions where the lines of sight moving forward from the left and right eyes are artificially refracted in the left and right directions, the width of the observable image is limited to the range of the distance between the left and right eyes. Images of larger dimensions can be observed without being imaged, and these images are actually magnified and observed by a convex Fresnel lens placed in front of the left and right eyes. It is possible to observe a stereoscopic image with a wide field of view larger than this size.

  Furthermore, since the wavelength range (color) of light is not assigned to the left and right eyes, natural color expression similar to that of a normal planar image is naturally possible, and special light such as polarized light is used. Since it is not a thing, it is less affected by the inclination of the face and glasses, and the image presenting means can be, for example, a projection (projector, liquid crystal display) as long as the left-eye image and the right-eye image can be arranged at appropriate positions. It can be applied to anything such as a projection device, a display device (a cathode ray tube, a liquid crystal display device, a plasma display device, an EL display device, etc.), a printed material, a photographic print, a positive film, and the like.

  In addition, the stereoscopic glasses of the present invention itself have a very simple structure in which a convex Fresnel lens is simply fitted into a normal glasses frame (or a substitute thereof) instead of a normal lens. Since no accessories such as a power supply or a control device are required, mass production is possible easily and inexpensively, and there is no problem in distribution, sales, and distribution, and it is convenient to carry. When you want to observe a stereoscopic image, you can easily use it anytime and anywhere to enjoy viewing a stereoscopic image with high image quality and stereoscopic effect.

The schematic sketch of the stereoscopic spectacles of this invention. Explanatory drawing of the principle of the stereoscopic vision by the stereoscopic glasses of this invention.

  Hereinafter, an example of an embodiment for carrying out the present invention will be described in detail with reference to the drawings.

  For example, as shown in FIG. 1, the stereoscopic spectacles 10 of the present invention are a pair of left and right lenses (a concave lens in the case of myopia correction glasses, a concave lens in the case of spectacles for hyperopia, as shown in FIG. A pair of left and right convex Fresnel lenses, that is, a left-eye convex Fresnel lens 13 and a right-eye convex Fresnel lens 14 are fitted into a portion where a convex lens) is to be fitted.

  Here, the left-eye convex Fresnel lens 13 and the right-eye convex Fresnel lens 14 do not include the optical axis of the lens within the effective plane thereof, that is, within the range surrounded by the frame 11, and the optical axis of the lens. In a normal Fresnel lens with concavities and convexities formed concentrically around the center, a lens having a shape corresponding to a part obtained by cutting off a part of the peripheral portion deviated in any direction from the optical axis is used.

  The left-eye convex Fresnel lens 13 and the right-eye convex Fresnel lens 14 face the optical axis side of each lens, that is, the left-eye convex Fresnel lens 13 has an end on the optical axis side (FIG. 1). The right-side convex Fresnel lens 14 faces the optical axis side end (on the paper surface of FIG. 1), and the right-side convex Fresnel lens 14 faces the side opposite to the right eye (right side of the paper surface of FIG. 1). The left end of the frame is placed on the left and right side of the frame 11 so as to face the opposite side of the left eye (left side of the sheet of FIG. 1).

  In the present invention, the shapes of the contours of the left-eye convex Fresnel lens 13 and the right-eye convex Fresnel lens 14 can be arbitrarily selected. In addition to the rectangle shown in FIG. A rectangular shape, a rounded shape thereof, a circular shape, an elliptical shape, a lion shape, an oval shape, or any other shape used for normal glasses or sunglasses can be adopted.

  The shape and structure of the frame 11 and the temple (vine) 12 are also completely arbitrary, and the frame 11 does not necessarily surround the entire contour of each lens, and has a shape that surrounds only a part of the contour of each lens. Alternatively, each lens may be directly connected and fixed with a connecting bracket or the like without the frame 11, or the left and right Fresnel lenses may be connected together to form a goggle-like structure. For example, nose glasses or patterned glasses may be used without providing the temple 12.

  The material of the frame 11 and the temple 12 is completely arbitrary, and it may be a metal or a synthetic resin as in the case of normal glasses, or a simple one that can be fully used with cardboard or synthetic paper can be produced. is there.

  Of course, the Fresnel lens used for the left-eye convex Fresnel lens 13 and the right-eye convex Fresnel lens 14 may be made of optical glass. However, it is usually a lightweight, easy-to-mold plastic sheet (thickness). The one of about 0.3 mm to 5 mm is often used.

  Highly transparent acrylic, polycarbonate, polyvinyl chloride, polystyrene, etc. are often used as plastic types. As molding methods, cast molding methods or UV curable resin methods may be used for precise molding methods. However, the hot press method is usually the most common, and the inexpensive injection molding method and extrusion molding method can be used for applications where the required image quality is not so high although the accuracy is slightly inferior.

  Such plastic Fresnel lens sheets include, for example, portable simple magnifiers, camera finder lenses, safety mirror lenses, spotlight lenses, LED illumination lenses, optical sensor lenses, and overhead projector lenses. It is used for a wide range of applications such as a rear projection screen lens and a condensing lens for photovoltaic power generation.

  In the stereoscopic glasses of the present invention, the Fresnel lens may be a single-sided Fresnel lens or a double-sided Fresnel lens, and in the case of a single-sided Fresnel lens, the concave / convex surface may be directed outward or inward. Although it seems that wearing the single-sided Fresnel lens with the concavo-convex surface facing outwards seems slightly better to wear.

  Next, the principle of stereoscopic viewing using the stereoscopic glasses of the present invention will be described.

  When a stereoscopic image is observed using the stereoscopic glasses of the present invention, as shown in FIG. 2, first, the left-eye convex Fresnel lens 22 is in front of the left eye 21, and the right eye 31 is in front of the right eye 31. The stereoscopic glasses of the present invention are normally worn in the same manner as when wearing normal glasses so that the Fresnel lens 32 for the camera comes.

  The left eye image 23 obtained by photographing the observation object from the position of the left eye is further located on the front left side of the left-eye convex Fresnel lens 22, and the observation object is further located on the front right side of the right eye Fresnel lens 32. The right-eye images 33 obtained by photographing from the position of the right eye are respectively arranged.

  Then, the line of sight going from the left eye 21 to a certain point ahead (the position of the composite stereoscopic image 41 in FIG. 2) is directed leftward from the left-eye convex Fresnel lens 22 due to the refractive action of the left-eye convex Fresnel lens 22. On the other hand, the line of sight from the right eye 31 toward the same forward point is directed rightward from the right-eye convex Fresnel lens 32 by the refractive action of the right-eye convex Fresnel lens 32.

  Therefore, if the left-eye image 23 and the right-eye image 33 are respectively placed at the ends of the left and right sight lines refracted in this manner, the observer's eyes are the sight lines of the left eye 21 and the right eye 31. Even if you do not make any special effort to forcibly separate the left eye 21, the left eye 21 is placed on the left side of the front point in exactly the same way as when looking at the front point. In the right eye 31, the right eye image 33 arranged on the right side of the same forward one point can be naturally observed without difficulty.

  At this time, the observer perceives both the left-eye image 23 viewed with the left eye 21 and the right-eye image 33 viewed with the right eye 31 as if they existed at one point in front as described above. The left-eye image 23 and the right-eye image 33 are slightly different due to the difference in the shooting angle of the observation object, so that the eyelid is perceived as if a three-dimensional observation object is actually placed there. It is.

  That is, the observer views a virtual image generated by refracting the light from the left-eye image 23 by the left-eye convex Fresnel lens 22 and a virtual image generated by refracting the light from the right-eye image 33 by the right-eye convex Fresnel lens 32. And the synthesized stereoscopic image 41, which is a virtual image generated in front of the line of sight.

  The composite stereoscopic image 41 is not only a stereoscopic image obtained by combining the left-eye image 23 and the right-eye image 33 which are planar images, but also the convex lenses of the left-eye convex Fresnel lens 22 and the right-eye convex Fresnel lens 32. As a result of the enlargement action, the image for the left eye 23 and the image for the right eye 33 are enlarged.

  Further, since FIG. 2 is a schematic diagram, the horizontal width of the left-eye image 23 and the right-eye image 33 is described to be slightly larger than the interval between the left and right eyes. The distance between the lenses 22 and 32 and the left and right images 23 and 33 (usually about several tens of centimeters), and the distance between the left and right eyes 21 and 31 and the left and right convex Fresnel lenses 22 and 32 (usually several 2), the left-eye image 23 and the right-eye image 33 can be taken much larger (for example, about 10 times or more) than the ratio (less than 3 times) on the paper surface of FIG. The lateral width of can be set to be several times the interval between the left and right eyes.

  Moreover, since the left-eye image 23 and the right-eye image 33 are enlarged and combined by the action of the left and right convex Fresnel lenses 22 and 32 as described above, the left and right images are not put on the stereoscopic glasses. Compared with the case of observing and observing at the same time, a stereoscopic image with a far wider field of view can be observed.

  The image for left eye 23 and the image for right eye 33 observed using the stereoscopic glasses of the present invention may be images fixed to a tangible object such as a printed matter, a photographic print, a positive film, a projector, It may be an image projected on a projection screen by a liquid crystal projector or the like, or a cathode ray tube, a liquid crystal display device, which is frequently used for a display screen of a television, video, personal computer, portable information terminal, etc. It may be an image displayed on the screen of a display device such as a plasma display device or an EL display device.

  Further, the left-eye image 23 and the right-eye image 33 are not limited to images obtained by actually photographing a three-dimensional observation object as described above. For example, drafting technology, computer graphics technology, virtual reality It may be an image created artificially using technology, etc., or it may be created by hand-drawing or manual modification of ordinary photos as long as a parallax image can be created with sufficient accuracy to achieve the object of the present invention. Of course, there is no problem even if the image is made.

  Further, the left-eye image 23 and the right-eye image 33 may be still images or may be moving images. In the case of moving images, the moving images are replaced by mechanically replacing a number of still images. By applying an expression technique (a so-called flip-palm technique), a movie or television (video) technique, or a moving picture expression technique using computer graphics, a stereoscopic image can be viewed.

  The stereoscopic glasses of the present invention can be easily and inexpensively manufactured using Fresnel lens sheets that are already widely used in various applications and are commercially available at low cost. For example, the owner can freely carry it anywhere and enjoy viewing 3D images at their favorite places. it can.

  In addition, from the viewpoint of the supplier, the stereoscopic glasses are not bulky as described above, and can be sufficiently attached to other arbitrary products and distributed. Attached to a collection of books and magazines such as collections of pictures and video tapes, video discs, CDs, DVDs, Blu-ray discs, memory cards, memory sticks, etc. that record stereoscopic images (still images or movies) Therefore, it can be distributed and sold in large quantities through normal distribution routes.

  In addition, the stereoscopic glasses themselves are sold at a low cost or distributed free of charge, and stereoscopic images (still images or moving images) are distributed through electric communication lines (telephone lines, the Internet, etc.) for a fee. The user is allowed to use or attach this stereoscopic glasses to advertisements, sales promotions, giveaways (printed materials or recording media, etc.) including stereoscopic images (still images or moving images) It can also be applied free of charge for purposes such as sales promotion and customer service.

  As described above, the stereoscopic glasses of the present invention are lightweight, not bulky, can be manufactured at low cost, and do not require special equipment for observing stereoscopic images, and can be easily used by anyone anywhere. Therefore, it is highly practical and can be used in a wide range in a very large number of modes.

DESCRIPTION OF SYMBOLS 10 ... Stereoscopic glasses 11 ... Frame 12 ... Temple 13 ... Left-eye convex Fresnel lens 14 ... Right-eye convex Fresnel lens 21 ... Left eye 22 ... Left-eye convex Fresnel lens 23 ... Left eye image 31 ... Right eye 32 ... Right eye convex Fresnel lens 33 ... Right eye image 41 ... Compound stereoscopic image

Claims (1)

  Stereoscopic glasses characterized in that two convex Fresnel lenses that do not include the optical axis of the lens within the effective plane are arranged side by side with the optical axis side of each lens facing outward.

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