JP2002328331A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnifying lens and a display device which are small- sized, light weight, and can be made to have a wide field view and of which cost can be brought down. SOLUTION: In the display device forming image and where an optical mechanism to observe the image by the naked eye is installed in front of the eyes of an observer, the optical mechanism is provided at least with an image display element 71, a screen 75 where an image is projected, a projecting lens 74 projecting the image on the image display element 71 to the screen 75 and a magnifying lens 76 for looking at the projected magnified image on the screen 75 with the naked eyes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compound lens which combines a negative lens which diverges light and a positive lens which converges light as an enlargement lens for observing an enlarged image of an object with the naked eye, and an image display. An optical system unit having at least an element and a magnifying lens for viewing an enlarged image is attached to a part of a body such as a head, and is a portable type for personal use for viewing images such as television and video images. The present invention relates to a display device.

[0002]

2. Description of the Related Art Hitherto, various types of display devices which are attached to a part of a body such as a head and provide a small but realistic image have been developed and provided. Such display devices can be broadly classified into the following two types due to differences in optical systems.

One is to observe a virtual image of a two-dimensional image display device (for example, Japanese Patent Application Laid-Open No. 3-289615, Japanese Patent Application Laid-Open No.
168489, JP-A-5-183838). Another type forms an image by scanning a point light source or a one-dimensional light source pattern on the retina (for example, US Pat. No. 4,934,773, and related US Pat. No. 5,003,300).

[0004] The prior art will be described with reference to FIGS. First, as a device for observing a virtual image of a two-dimensional image display element, for example, a display device 1 shown in FIG.
01 is provided with a substantially eyeglass-shaped housing 102, and a speaker 1 is provided on the sound portions 102a on both sides corresponding to the ears.
03 and 103 are arranged, and image display elements 104 and 104 using a liquid crystal panel and the like and one or a plurality of magnifying lenses 105 and 105 are arranged in the image part 102b corresponding to the eyes. Have been. In the display device 101, two optical elements are provided to correspond to the right and left eyes of the observer, respectively, and the left and right image display elements 104 supply images from the different positions with respect to the same object, respectively. Then, a stereoscopic image can be obtained.

As shown in FIGS. 48 and 49, the magnifying lens 105 is disposed between the image display element 104 and the observer's eye 106. Thereby, the observer can observe an enlarged image obtained by enlarging the image formed by the image display element 104. In addition, an achromatizing lens, an aspherical lens, or the like is generally used as the magnifying lens 105 in order to remove various aberrations. 48 shows an example in which the magnifying lens 105 is constituted by one magnifying lens 107, and FIG. 49 shows an example in which the magnifying lens 105 is constituted by a plurality of magnifying lenses 107. ing. The symbol Xo in FIG. 48 is the center of the image display element 104,
H is the principal point of the lens 107 of the magnifying lens 105, Xe is the pupil position of the eye 106, S is the distance from the center of the image display element 104 to the principal point of the lens 107, and Se is the principal point of the lens 107 from the principal point of the lens 107. Indicates the distance to the pupil position.

Next, as a device for forming an image by scanning a point light source or a one-dimensional light source pattern on the retina, for example, as shown in FIG. The display device 11 includes a vibration mirror 112 serving as an optical path deflecting unit, and one or a plurality of magnifying lenses 105.
There is one.

In the display device 111, a virtual image of the light emission pattern of the one-dimensional display element 112 is observed by the magnifying lens 105. In other words, the one-dimensional display element 112 is
From By deflecting the angle of the light beam 114 reaching the eye 106, the Z ₁ on the retina of the eye 106 via a Z ₀ is adapted to obtain a two-dimensional image by scanning up to Z _2.

[0008]

However, as shown in FIG. 48, in the configuration in which one lens 107 is used for the enlarging lens 105, a wide apparent field of view can be obtained by refracting the lens 107 or distorting the image. Is difficult. Therefore,
As shown in FIG. 49, it is necessary to configure the magnifying lens 105 by combining a plurality of lenses 107. In some cases, an aspheric lens is used to reduce aberration.

However, as the number of lenses increases, the weight and volume increase, and as shown in FIG. 49, the distance between the eye 106 and the lens 107 decreases.
There is a disadvantage that it is hard to see.

[0010] Even when the aspherical lens is used as described above, it is difficult to remove the aberration of the peripheral image.

The display device 10 shown in FIG.
1, the image display element 104 and the magnifying lens 10
Since the position 5 is located away from the eye 106, if the weight of the image display element 104 and the lens 107 is large, there is a problem that the center of gravity is located far from the head. This leads to an increase in the size of the fixing means to the head, and also increases the feeling of fatigue at the time of wearing.

Further, if the apparent field of view is widened while keeping the number of pixels of the image display element 104 constant, there is a problem that the pixels become coarse and the image quality deteriorates. Further, an increase in the number of pixels of the image display element 104 causes a problem that the image display element 104 is increased in size, weight, and cost.

On the other hand, the display device 11 shown in FIG.
In (1), it is necessary to perform the angular deflection of the light beam 114 about the center of the entrance pupil of the eye 106 or the center of rotation of the eye 106, so that it is difficult to scan at a large angle, and thus it is difficult to widen the field of view. There is.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to provide a display device which can be reduced in size and weight, can have a wide field of view, and lowers manufacturing costs. It is in.

[0015]

First, a magnifying lens that can be used in the display device of the present invention will be described.

The first magnifying lens is a magnifying lens for observing an enlarged image of an object with the naked eye, and includes a two-dimensional negative lens array in which the main surfaces of a plurality of negative lenses are arranged on the same plane. A two-dimensional positive lens array in which the main surfaces of a plurality of positive lenses are arranged on the same plane, and the two-dimensional positive lens array is arranged to face each other so as to form a compound lens with each negative lens and positive lens; The pair of the negative lens and the positive lens are arranged such that the intersection of a straight line connecting the principal points of the respective lenses substantially coincides with a point Xc separated from the two-dimensional positive lens array by Sc satisfying the following equation. Configuration.

[0017]

(Equation 1)

So is the distance from the negative lens main surface to the object (So <0), Sd is the distance from the negative lens main surface to the positive lens main surface (Sd> 0), and f1 is the focal length of the negative lens (f
1 <0) and f2 indicate the focal length (f2> 0) of the positive lens.

Here, the negative lens is an optical system capable of diverging light, and may be a single concave lens or a combination of a plurality of lenses. The positive lens is an optical system capable of collecting light, and may be a single convex lens or a combination of a plurality of lenses.

For the reason described later, the intersection of the straight line connecting the principal points of the negative lens and the positive lens of the compound lens is a point Xc.
Does not have to match exactly.

The above-described compound lens is an optical system for viewing an image (virtual image) by a negative lens as an image (virtual image) enlarged by a positive lens. Light from the object to be observed enters the negative lens of the compound lens and exits the positive lens to the eye.
In this optical system, the distance between the lens and the eye does not change and the distance between the object and the lens can be reduced as compared with a conventional single lens loupe having the same magnification.

Light emitted from one point on the object to be observed is
It enters the eye through multiple compound lenses. Then, the composite lenses are arranged on a plane such that a straight line connecting the respective principal points of the negative lens and the positive lens of each composite lens intersects at a point Xc separated from the positive lens array by Sc that satisfies the above equation (1). Sometimes, under paraxial theory, the respective images produced by the compound lens appear to match.

That is, in the magnifying lens having the above configuration, even if a light beam emitted from one point of the object to be observed enters the eye through a plurality of compound lenses, the light beam is focused on a single point on the retina. That is, it can be said that the magnifying lens is a lens in which an object and an image correspond one-to-one.

Further, by arranging lenses into a single lens having a same focal length, if a plurality of lenses having a small diameter are grouped into an array to have the same size as the lens diameter of the single lens. Therefore, the lens can be made thinner and lighter than in a single lens having the same magnification, so that the lens can be made thinner and lighter.

Further, the distortion and curvature of the image due to the widening of the field of view can be eliminated by, for example, changing the focal length (combined focal length of the negative lens and the positive lens) of the compound lens around the lens array. . As described above, it is possible to correct an image by changing various characteristics of each compound lens.

When the point Xc does not coincide with the intersection of a straight line connecting the principal points of the negative lens and the positive lens constituting each compound lens, the images of the respective compound lenses disperse without matching. However, even if the image is dispersed, there is no problem if it is not recognizable to the naked eye. Even if the variance of the image is large enough to be recognized by the naked eye, depending on the image quality of the object to be observed, it may not be known that the image is scattered. Under these circumstances, in the arrangement of the compound lenses, the intersection of the straight line and the point Xc may not be exactly the same in practical use.

In the second magnifying lens, in addition to the first configuration, a two-dimensional negative lens array and a two-dimensional positive lens array are respectively formed on a planar substrate, and the respective substrates are arranged substantially in parallel. Configuration.

According to the configuration of the second magnifying lens described above, in addition to the operation of the magnifying lens of the first configuration, a two-dimensional negative lens array and a two-dimensional positive lens array are formed on a plane substrate. Since the position of the lens on the flat substrate is fixed, the positioning when forming the compound lens from the respective negative and positive lenses becomes easy.

In the state where the lens position is fixed on the substrate, the diopter can be adjusted by changing the distance between the two-dimensional negative lens array substrate and the two-dimensional positive lens array substrate. Diopter adjustment becomes easy.

The third magnifying lens has a structure in which a light-shielding member is provided between the compound lenses in addition to the structure of the first or second magnifying lens.

It is desirable that at least the surface of the light-shielding member is made of a material that shields and absorbs light.

According to the configuration of the third magnifying lens described above, since the light-shielding member is provided between the respective compound lenses, the respective compound lenses can be formed as light-shielding frames. . Thus, the light-blocking member acts so that light rays passing through the negative lens constituting the compound lens do not pass through the positive lens of another compound lens.

Further, the light-shielding member is penetrated between a pair of positive and negative lenses constituting each compound lens constituting the compound lens of the two-dimensional negative lens array and the two-dimensional positive lens array. With this configuration, it is easy to maintain the two two-dimensional lens arrays in parallel with this member.

The fourth magnifying lens is a magnifying lens for observing an enlarged image of an object with the naked eye, and includes a two-dimensional negative lens array in which the main surfaces of a plurality of negative lenses are arranged on the same plane. A two-dimensional positive lens array in which the main surfaces of a plurality of positive lenses are arranged on the same surface, and the two-dimensional positive lens array is arranged to face each other so as to form a compound lens with each negative lens and positive lens; The pair of the negative lens and the positive lens that make up the intersection of the straight line connecting the principal points of each lens,
The two-dimensional positive lens array substantially coincides with a point Xc separated from the two-dimensional positive lens array by Sc satisfying the above equation (1), and is arranged on a substantially spherical surface centered on this point.

According to the above configuration, a compound lens obtained by combining a negative lens and a positive lens having the same optical axis is arranged on a curved surface. Light from the object to be observed enters the negative lens of the compound lens and exits the positive lens to the eye. The image viewed by the observer is an image (virtual image) obtained by enlarging the image of the negative lens (virtual image) with the positive lens.

Light emitted from one point on the object to be observed is
It enters the eye through multiple compound lenses. At this time, the images seen by each compound lens do not exactly match. That is, since the compound lenses are arranged on a spherical surface centered on the point Xc, the object plane of each compound lens is a tangent plane of the spherical surface centered on the point Xc. Since the tangent planes at different positions on the spherical surface do not coincide, the object surfaces of the respective compound lenses also do not coincide. As described above, since the object planes of the compound lenses do not coincide with each other, the respective images do not coincide with each other in principle. That is, the images of the respective compound lenses with respect to one object point disperse without being coincident.

However, when the lens diameter of the composite lens is reduced, the number of images for one object point is reduced, and the variance of each image can be reduced.
Because the compound lens is composed of at least two lenses, each lens plays a role of an aperture stop. Therefore, when the lens diameter is reduced, the observable range is narrowed. As a result, the number of composite lenses that can see one object point is reduced. That is, the number of images for one object point is reduced. Reducing the number of images corresponds to eliminating images with large variance. In addition, when the lens diameter is reduced, the angle between the optical axes of the adjacent compound lenses is reduced, so that the image dispersion is reduced.

Therefore, when the positional deviation of each image with respect to the same object point by each compound lens is converted into a visual angle, if the visual angle is equal to or less than the resolving power of the eye, the dispersed image is recognized as one image. Is done. In this manner, the present optical system can make the object and the image correspond one-to-one by reducing the lens diameter.

When the rotation point of the observer's eye is set at the point Xc, any compound lens can be viewed from the optical axis thereof. There is no. That is, even if the composite lens is arranged in a wide range and the apparent field of view is widened, there is no deterioration of the peripheral image unlike the conventional lens. Also, there is no need to increase the number of lenses for aberration correction.

Further, when the lens diameter of the compound lens is reduced, light passing near the optical axis of the compound lens can be observed, so that a good image with little aberration can be obtained for each compound lens. . Also, when the lens system is made smaller, the thickness of the lens is reduced, and the weight of the lens is also reduced.

Therefore, by using a compound lens having a small lens diameter and observing from the vicinity of the point Xc, it is possible to obtain a favorable optical system having a wide apparent field of view, which is small, thin, lightweight, and has little aberration. An image can be provided.

The fifth magnifying lens includes, in addition to the fourth configuration, a lens barrel that houses a pair of negative lens and positive lens to form a compound lens, and the lens barrel has a generatrix on a side surface thereof. Alternatively, the configuration is such that the intersection of the extension lines of the ridge lines is substantially coincident with the point Xc.

The sectional shape of the lens barrel may be polygonal or circular, and it is desirable that the material of the lens barrel has a light shielding property for blocking light. The inner wall of the lens barrel is desirably formed of a material that absorbs light in order to prevent light from being irregularly reflected on the inner wall.

The side surface of the lens barrel does not need to be smooth, and a groove or a protrusion for joining may be locally formed.

With the configuration of the fifth magnifying lens,
When a lens barrel having such a shape that the extension of the generatrix or ridge line of the side surface of the lens barrel that houses the compound lens intersects at the point Xc on the optical axis of the compound lens is closely aligned with the side surfaces of the lens barrel, The negative lens and the positive lens contained in the lens barrel are respectively arranged on a spherical surface centered on the point Xc on the optical axis.

Thus, it is possible to construct a magnifying lens having a predetermined curvature only by arranging the lens barrels having the above-described shapes.

In the sixth magnifying lens, in addition to the fourth configuration, the compound lens has one surface formed as a concave surface equivalent to a negative lens and the other surface formed as a convex surface equivalent to a positive lens. And a lens having a single-piece structure,
, And the side surface of the lens is formed such that the intersection of the extended line of the generatrix or the ridge line of the lens approximately coincides with the point Xc.

It is desirable that the side surface of the single lens is coated with a light-shielding material, and a light-shielding member may be attached to the side surface. Further, the light-shielding property may be provided by modifying the side surface.

The single lens may be constituted by a single lens, or a single lens may be constituted by bonding a plurality of lenses.

According to the configuration of the sixth magnifying lens, the compound lens has a shape in which the central axes of the negative lens and the positive lens coincide with each other. be able to.

Therefore, when the compound lens is formed into a single lens in which one surface is formed as a concave surface equivalent to a negative lens and the other surface is formed as a convex surface equivalent to a positive lens, the single lens also becomes a rotating body. Therefore, the production is easier than when the negative lens and the positive lens are formed separately.

Further, if the single lens is constituted by a single lens (hereinafter, referred to as a single lens), the number of lenses used for the compound lens can be reduced, and the lens barrel for housing the lens can be reduced. Since it becomes unnecessary, the cost for manufacturing the compound lens array can be reduced.

The side shape of the single lens is determined so that the intersection of the generatrix or the ridge line on the side surface of the single lens coincides with the point Xc on the optical axis of the single lens, and the side surfaces of the single lens are densely arranged. This single lens can be arranged on a spherical surface centered on the point Xc on the optical axis. Thus, by arranging the single lenses having the above shape,
A magnifying lens in which single lenses are arranged in an array can be easily configured.

The seventh magnifying lens is a magnifying lens for observing an enlarged image of an object with the naked eye, and includes a two-dimensional negative lens array in which the main surfaces of a plurality of negative lenses are arranged on the same plane. A two-dimensional positive lens array in which the main surfaces of a plurality of positive lenses are arranged on the same surface, and the two-dimensional positive lens array is arranged to face each other so as to form a compound lens with each negative lens and positive lens; The pair of the negative lens and the positive lens that make up the intersection of the straight line connecting the principal points of each lens,
The composite lenses are arranged linearly in a line so as to substantially coincide with each other at a point Xc separated from the two-dimensional positive lens array by Sc satisfying the above expression (1), and the composite lens array is formed. The array is arranged on a substantially cylindrical surface centered on the point Xc. The linear compound lens array may have a plurality of rows.

According to the configuration in which the linear compound lens arrays are arranged on a cylindrical surface, the compound lenses are arranged on a plane in the generatrix direction of the cylinder, so that the production is easy, and the production of the cylinder is easy. In the circumferential direction, it is possible to easily obtain a wide apparent visual field with little aberration.

Further, since the compound lens array having the same shape can be used as the linear compound lens array arranged on the cylinder, the linear compound lens array can be expected to be reduced in cost by mass production.

In the eighth magnifying lens, in addition to the seventh configuration, the compound lens array includes a lens barrel for accommodating a negative lens array and a positive lens array, and the lens barrel has a side surface. Is formed so as to substantially coincide with a straight line passing through the point Xc and parallel to the linear compound lens array.

According to the configuration of the eighth magnifying lens, the composite lens array on the cylindrical surface can be formed by arranging linear compound lens arrays on a cylinder. At this time, a lens barrel for accommodating the linear compound lens array is provided, and if the side surface shape of the lens barrel is widened, by joining the side surfaces,
The above-mentioned compound lens array can be arranged on a desired circumference to easily constitute a magnifying lens.

Further, the linear composite lens is formed in such a shape that the point Xc on the optical axis of the linear composite lens array coincides with the extension surface on the image side of the side surface of the lens barrel. The array can be arranged on a cylinder about the point Xc.

In the ninth magnifying lens, in addition to any one of the first to eighth constitutions, the compound lens has a two-dimensional lens which is closest to the observer. Is set to less than half.

According to the configuration of the ninth magnifying lens, if the distance between the lenses forming the two-dimensional lens array closest to the observer is less than half the pupil diameter of the naked eye, the two-dimensional lens array is Due to the gap between the lenses to be formed and the light-shielding frame, a portion where an image cannot be seen can be eliminated.

This is because the invisible part of the video appears in the following cases. The luminous flux from one point of the object is
Several adjacent compound lenses take charge and are emitted from each compound lens as a light beam substantially parallel to the viewer's side. At this time, the gap between the lenses of the two-dimensional lens array and the light-shielding frame become a shadow, and there are places where light reaches and places where light does not reach on the observer side. When the shadow covers the pupil of the naked eye, one point on the object becomes invisible. Therefore, as a whole, a part of the image appears to be hidden.

To prevent this, the pupil of the observer only needs to be larger than the shadow. Then, at least one of the light beams coming from the compound lens can be made to enter the pupil.
That is, it is sufficient that the gap between the light beams emitted from the adjacent compound lenses is at most the lens interval of the two-dimensional lens array closest to the observer. Accordingly, if the lens interval is set to be equal to or less than half of the pupil of the observer, the problem that one or more light beams enter the pupil and the image becomes partially invisible can be solved.

Here, a display device using the first to ninth magnifying lenses will be described.

As the display device, an optical mechanism for forming an image and observing the image with the naked eye is disposed in front of the observer. In the display device, the optical mechanism includes an image display element and the image display element. A configuration is provided in which at least any one of the first to ninth magnifying lenses for visually observing an enlarged image of an image formed on the display element is provided.

As the image display device, a cathode ray tube,
A self-luminous element such as an EL element, a fluorescent tube, and an LED, or a shutter array that controls transmission and reflection of light, such as a liquid crystal element, may be used.

In order to arrange the optical mechanism in front of the observer's eyes, the optical mechanism may be fixed to the head using a member such as a helmet, a hair band, or an ear hook.
Alternatively, a wristband may be provided in the optical mechanism, and the wristband may be provided to arrange the optical mechanism in front of the observer. Further, a fixing member such as a screw hole for fixing the optical mechanism to an external holding member such as a tripod may be provided.

The optical mechanism may have an adjusting mechanism for changing the distance between the image display device and the magnifying lens.

According to the above configuration, the display device is
The image on the image display element is observed with any one of the first to ninth magnifying lenses. The operation of such a display device will be described in the following three cases depending on the difference in the configuration of the magnifying lens.

(1) In the case of a magnifying lens in which a compound lens is arranged on a plane In the magnifying lens described above, the distance between the image display element and the lens can be reduced as compared with a conventional single-lens loupe having the same magnification. Therefore, the position of the image display element in the display device can be brought closer to the eyes of the observer. Thus, the thickness of the device in the front-rear direction can be reduced, and the center of gravity of the optical mechanism can be made closer to the head. As a result, the feeling of fatigue when the optical mechanism is mounted on the head can be reduced. Further, the burden on the mounting means on the head is reduced, so that the mounting means can be simplified.

(2) In the case of a magnifying lens in which a compound lens is arranged on a spherical surface According to this magnifying lens, a wide-field image without deterioration of an image in the periphery can be obtained. Thus, it is not necessary to increase the number of lenses for widening the field of view unlike the conventional lens, so that the size and weight of the display device for realizing the wide field of view can be reduced.

(3) In the case of a magnifying lens in which a compound lens array is arranged in a cylindrical shape The above-described magnifying lens is obtained by using a magnifying lens in which a one-dimensional compound lens array is arranged in a cylindrical shape in the horizontal direction of the screen. Since the horizontal viewing angle of the screen can be increased, it is effective when observing an image such as a cinema size that is long in the horizontal direction of the screen.

Also, since the object surface of the lens is a cylindrical surface, it is necessary to arrange the one-dimensional image display element on the cylinder or to bend the flat image display element on the cylinder to make the object surface curved. Can be easily done.

Next, the display device of the present invention will be described.

According to a first aspect of the present invention, there is provided a display apparatus in which an optical mechanism for forming an image and observing the image with the naked eye is disposed in front of an observer. The optical mechanism includes an image display element, a screen on which the image is projected, a projection lens that projects the image on the image display element onto the screen, and an enlarged image of the image projected on the screen. And at least a magnifying lens.

Each of the magnifying lens and the projection lens is an optical system capable of condensing light. For example, a convex lens, an aggregate of a plurality of lenses, or a diffractive lens may be used. Further, it may be a compound lens composed of any one of the first to ninth magnifying lenses.

The projection surface of the screen is preferably a white scattering surface. Further, fine processing for controlling reflection may be performed on the surface of the projection surface, and the surface of the projection surface at this time may be a mirror surface. Further, in order to adjust the brightness of the projection image, the reflectance or the scattering coefficient of the projection surface may be changed for each location on the projection surface.

According to the configuration of the first aspect, an image is formed by projecting the display pattern of the image display device on the screen, and the image is observed through the magnifying lens. That is, an optical system is configured in which an image formed by the projection lens is viewed by the magnifying lens.

Here, when the magnifying lens has a curvature aberration, the curvature of the virtual image can be flattened by making the projection surface curved. Also, the magnifying lens has distortion,
When the distortion is of the pincushion type, when the projection lens forms an image having a barrel-shaped distortion opposite to the distortion, the distortion can be canceled.

In this way, various aberrations of the magnifying lens can be eliminated by the operation of the projection lens and the projection surface without increasing the number of lenses or making the lens aspherical. Therefore, it is possible to reduce the thickness, weight, and cost of the magnifying lens, and further reduce the size and weight of the display device.

Further, the screen may be a thin plate or an inner wall of a housing for holding an optical portion of the display device, as long as the screen can project an image. It is possible to reduce the size, weight, and thickness.

According to a second aspect of the present invention, in order to solve the above-mentioned problem, in addition to the configuration of the first aspect, the display device is disposed between the projection lens and the screen, and is connected to the image display device via the projection lens. An optical path deflecting means for deflecting light and scanning on a screen to form an image is provided.

As the optical path polarizing means, it is desirable to use a rotating polygon mirror such as a polygon mirror, a vibrating mirror or the like. In the case of a rotating polygon mirror, the angle of the optical path is deflected during the rotation process of the mirror operation, and in the case of a vibrating mirror, an image is formed on the screen by changing the angle or position of the optical path by reciprocating rotation of the mirror operation. It has become.

When the optical path deflection is in one direction, it is desirable to use a one-dimensional image display element in which pixels are arranged linearly as an image display element. Here, the array of pixels may be one row or a plurality of rows. Also, a staggered arrangement may be used. At this time, a two-dimensional image is formed by changing the display pattern of the one-dimensional image display element according to the optical path deflection operation.

When the optical path deflection can be performed in a plurality of directions, the image display element for projection may be a point light source.

The light for projection may be supplied from outside.

Further, a plurality of light-emitting elements composed of light-emitting elements of different colors or a light-emitting element array may be provided for colorizing the projected image.

According to the configuration of the second aspect, the display device projects the display pattern of the display element for displaying a part of the image on the screen, and scans the image projected on the screen to thereby form the image. Form. The scanning is performed by an optical path deflecting unit using a rotating or oscillating mirror. Then, the image formed on the screen is observed through a magnifying lens.

Thus, the display apparatus having the above-described configuration does not scan the direct light from the display pattern on the retina as in the related art, but scans the image on the projection surface. You can see that there is.

Therefore, the center of rotation for scanning in the conventional method had to be located at the rotation point of the eye, but according to this method,
Since the center of rotation for scanning may be set at the center of rotation of the optical path deflecting means, it is possible to scan over a wide range without difficulty. In addition, the width of the apparent field of view does not depend on the scanning range, but depends on the apparent field of view of the magnifying lens for viewing an image on the projection surface formed by scanning, so that the scanning limits the apparent field of view. Never.

Further, since the image display element may be a one-dimensional or one-dimensional light-emitting element or an optical shutter, the size and weight of the display device can be reduced.

According to a third aspect of the present invention, there is provided a display device, wherein an optical mechanism for forming an image and observing the image with the naked eye is arranged in front of an observer. The optical mechanism includes an image display element, a screen on which the image is projected, a projection lens that projects the image on the image display element onto the screen, and an enlarged image of the image projected on the screen. And a lens for enlargement, wherein the lens for enlargement is disposed on an optical path from the projection lens to the screen.

According to the third aspect of the present invention, since the magnifying lens is arranged on the optical path from the projection lens to the screen, the light emission pattern on the image display element can be changed by the projection lens and the magnifying lens. An image can be formed by projecting onto a screen using the two lenses.

At this time, the image forming position of the display pattern by the projection lens is set not to be on the projection plane on the screen but to be a virtual image position of the image on the projection plane by the magnifying lens. In this way, the display pattern forms an image on the screen by the two lenses, the projection lens and the magnifying lens, to form an image. Then, the image is viewed with a magnifying lens.

Therefore, since the image viewing direction and the projection direction for image formation can both be performed from the front of the projection surface of the screen, an image generated when the image viewing direction is different from the projection direction. Can be eliminated. This eliminates the need to provide a means for correcting asymmetric distortion of an image, so that the device can be simplified, and the size of the device and the cost for manufacturing can be reduced.

Further, since projection is performed using the magnifying lens, the problem that the magnifying lens blocks the optical path for projection can be solved. Since the range that can be projected and the range in which an image can be viewed both depend on the apparent viewing angle of the magnifying lens, by expanding the apparent visual field of the magnifying lens, a wide range corresponding to the apparent visual field is obtained. An image can be formed.

According to a fourth aspect of the present invention, in order to solve the above-mentioned problem, in addition to the configuration of the third aspect, the optical mechanism further includes a first optical path from the image display element to the screen, and an observer from the screen. An optical path separating means for separating the optical path from the second optical path reaching the eye is provided.

As the optical path separating means, it is desirable to use a half mirror from the viewpoint of cost, ease of handling, and the like, and it is desirable that the half mirror has some practical light transmittance and reflectance.

According to the configuration of the fourth aspect, the optical path separating means is provided between the magnifying lens and the eye, and separates the first optical path for projection from the second optical path for viewing an image. . Here, the first optical path is an optical path starting from the image display element and sequentially passing through the projection lens, the optical path separating unit, and the magnifying lens to the screen. The second optical path is an optical path starting from the screen and passing through the magnifying lens and the optical path separating means to the eye in order. At this time, if a half mirror is used as the optical path separating means, the first optical path is bent at 90 degrees by the half mirror and then directed to the screen. The second optical path is made to pass through the half mirror. In this way, the first optical path and the second optical path are made to coincide or approach only from the half mirror to the screen.

By performing image projection and observation from the front of the projection surface side of the screen, it is possible to eliminate asymmetric distortion of the image. For this purpose, the first optical path and the second optical path should be close to or coincide with each other. It is necessary.

Therefore, as described above, the optical path separating means is provided between the magnifying lens and the eye to separate the first optical path for projection from the second optical path for viewing an image.
Even if the first optical path and the second optical path partially match, the image display element and the projection lens do not overlap the eyes.

A display device according to a fifth aspect is characterized in that, in order to solve the above-mentioned problem, in addition to the configuration of the fourth aspect, a polarizing element is used for the optical path separating means.

The above-mentioned polarizing element changes the reflectance or transmittance depending on the polarization state of light, or changes the polarization state of light. For example, a phase shifter, a rotator, a polarizer, a polarization separation element, etc. It is desirable to use Each of the above polarizing elements is formed of a crystal, a polymer sheet, a thin film, or the like. Or you may comprise combining with a diffraction element.

According to the configuration of the fifth aspect, by using the polarizing element whose ratio of reflection and transmission changes depending on the polarization state of the incident light beam, the light path from the display surface of the image display element to the screen and the light path from the screen are reduced. It is possible to suppress a decrease in the amount of light due to separation from the optical path to the pupil.

According to a sixth aspect of the present invention, in order to solve the above-mentioned problem, in addition to the configuration of the third, fourth or fifth aspect, the display device is disposed between the projection lens and the magnifying lens, and is provided with the projection lens interposed therebetween. Light path deflecting means for deflecting the light from the image display element and scanning the screen on a screen to form an image.

The center of deflection of the first optical path from the image display element to the screen by the above-mentioned optical path polarizing means or its virtual image by the half mirror substantially coincides with the convergence point of the second optical path from the screen to the eyes of the observer. Is desirable.

According to the above configuration, the display pattern of the image display element for displaying a part of the image is projected on the screen using the projection lens and the enlargement lens. Then, an image is formed by scanning the projected image on the screen. The scanning is performed by an optical path deflecting unit using a rotating or oscillating mirror. Then, the image formed on the screen is observed through a magnifying lens.

Since the image forming position of the projected image formed by scanning is located on a rotating body substantially centered on a mirror for deflecting the optical path, if the projection surface of the screen does not coincide with this, the deviation of the image forming position is corrected. To do this, a correction lens is required.

However, according to the above configuration, the center of deflection of the first optical path by the optical path deflecting means or the virtual image formed by the half mirror as the optical path separating means substantially coincides with the convergence point of the second optical path. , The image forming position of the projected image coincides with the projection plane of the screen. As described above, since the magnifying lens can also serve as a correction lens, a correction lens is not required to correct a shift of an image forming position, and the apparatus can be reduced in size and weight.

According to a seventh aspect of the present invention, in order to solve the above-mentioned problems, in addition to the constitution of the third, fourth, fifth or sixth aspect, the projection surface of the screen is formed in a mirror-like shape and the screen is formed in a mirror-like manner. On the projection plane of the above, so that the incident light of the first optical path from the image display element to the screen and the reflected light of the second optical path from the screen to the eyes of the observer satisfy Snell's law of reflection. It is characterized in that the first and second optical paths are set.

According to the configuration of the seventh aspect, the light beam from the image display device to the screen through the projection lens and the magnifying lens is reflected on the projection surface of the screen,
It reaches the eye through the magnifying lens. The reflection of the light beam at this time follows Snell's law. That is, since not the diffused light from the image display element but the direct light enters the eye, a brighter image can be obtained.

Also, since the light from the image display element forms an image on the screen, the magnification of the image (virtual image) viewed by the magnifying lens does not change even if the screen is curved.

The screen is preferably a mirror surface, but may be a diffusion surface. At this time, since specular reflected light, in which the light power is concentrated among the diffused light on the screen, enters the eye, a bright image can be obtained.

According to an eighth aspect of the present invention, in order to solve the above-mentioned problems, in addition to any one of the first to seventh aspects, as a magnifying lens, a plurality of negative lenses have principal planes on the same plane. And a two-dimensional positive lens array in which the main surfaces of a plurality of positive lenses are arranged on the same plane, so that each negative lens and positive lens constitute a composite lens. It is characterized in that complex lens arrays arranged opposite to each other are used.

According to the configuration of the eighth aspect, in a display device in which an image on a screen is magnified by a lens, a curved surface image can be easily obtained by forming an image on a curved projection surface. Therefore, it becomes easy to configure an object plane for observation with a compound lens array in which compound lenses are arranged on a curved surface or a cylinder as a magnifying lens.

According to a ninth aspect of the present invention, in order to solve the above-mentioned problem, in addition to the constitution of the eighth aspect, the complex lens array has a principal point distance between the complex lenses closest to the observer's eye. Is set to be equal to or less than half of the diameter of a light beam from one point on the image display element to the complex lens array.

According to the configuration of the ninth aspect, an image is formed by projecting the display pattern of the image display element on the screen by the projection lens and the composite lens array. The light from the image display element enters the complex lens array as a light flux that forms an image at a position where a virtual image of the magnifying lens is formed by the projection lens. At this time, if all of the light flux hits the gap between the lenses of the compound lens or the light-shielding frame, there arises a problem that the light of the image display element does not reach the screen.

Therefore, in the compound lens array, the lens interval between the compound lenses closest to the observer's eyes is set to be less than half the diameter of the light beam from one point on the image display element to the compound lens array. Thus, the light beam can reach the projection plane through at least one compound lens.

[0119]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] A magnifying lens that can be used in a display device of the present invention will be described as an embodiment with reference to FIGS. is there.

As shown in FIG. 1A, a composite lens array 1 as an enlarging lens according to the present embodiment is composed of a two-dimensional negative lens array 3 and a two-dimensional positive lens array 5 made by resin molding, respectively. Are arranged so as to sandwich a light shielding frame 4 as a light shielding member.

As shown in FIG. 1B, the two-dimensional negative lens array 3 includes a plurality of negative lenses 9 having a diameter (diameter) of about 1 mm.
Are formed in a planar shape, and the two-dimensional positive lens array 5 has a configuration in which a plurality of positive lenses 10 having a diameter of about 0.9 mm are formed in a planar shape.

Here, the negative lens 9 is a divergent optical system member. In this embodiment, a thin biconcave single lens will be described, and the positive lens 10 will be a convergent optical system. In the present embodiment, the description will be made using a thin biconvex single lens.

The light-shielding frame 4 is made of a resin colored with a black pigment such as carbon black, and has a plurality of openings 4a penetrating the two-dimensional negative lens array 3 side surface and the two-dimensional positive lens array 5 side surface. ... are provided. The opening 4a has a cylindrical shape in which the two-dimensional negative lens array 3 has a diameter substantially equal to the diameter of the negative lens 9 and the two-dimensional positive lens array 5 has a diameter substantially equal to the diameter of the positive lens 10. Are formed so as to penetrate between the pair of negative lens 9 and positive lens 10, respectively.

That is, the compound lens 2 is constituted by the pair of the negative lens 9 and the positive lens 10 and the opening 4a of the light shielding frame 4. That is, the composite lens array 1 has a configuration in which a plurality of composite lenses 2 are arranged in a plane. The compound lens 2 is for observing an image incident from the negative lens 9 side by enlarging the image with the positive lens 10.

Therefore, despite the fact that the compound lens 2 is arranged adjacent to the plane, the light shielding frame 4
Thereby, it is not affected by the incident light from the adjacent compound lens 2.

That is, in the composite lens array 1, the two-dimensional negative lens array 3 in which the main surfaces of the plurality of negative lenses 9 are arranged on the same plane, and the main surface of the plurality of positive lenses 10 are arranged in the same plane. And the two-dimensional positive lens array 5 disposed in such a manner that the negative lens 9 and the positive lens 10 constitute the composite lens 2 so as to face each other.

The two-dimensional negative lens array 3 and the two-dimensional positive lens array 5 are obtained by resin molding as described above. The resin used is mainly composed of methacrylic resin, and is formed by injection molding, transfer molding, or the like. And the like to form a desired shape.

When methacrylic resin is used for the lens, it is desirable to use acrylic resin. This is because acrylic resin has high light transmittance and uniform light transmittance over the entire visible wavelength range.
It is because it is the best among all resins. Also,
Since the specific gravity of the acrylic resin is about half of that of the glass, the weight of the two-dimensional negative lens array 3 and the two-dimensional positive lens array 5 can be easily reduced.

The light-shielding frame 4 is made of a resin colored with a black pigment such as carbon black as described above, and the resin used is a two-dimensional negative lens array 3.
A resin having good adhesiveness to the two-dimensional positive lens array 5 is desirable. Further, it is desirable to use a rigid resin having no elasticity for the light shielding frame 4. This is because the distance between the negative lens 9 and the positive lens 10 needs to be kept constant when the composite lens 2 is configured by the negative lens 9 and the positive lens 10.

As such a resin, it is preferable to use the same material as the two-dimensional negative lens array 3 and the two-dimensional positive lens array 5, and in this embodiment, an acrylic resin is used. That is, the light-shielding frame 4 is formed by a resin molding method such as an injection molding method including an acrylic resin containing carbon black that is incompatible with the acrylic resin. In addition, since the acrylic resin has little elasticity and is hard,
If acrylic resin is used, the negative lens 9 and the positive lens 1
The distance to zero can be kept constant.

The material used for the light-shielding frame 4 may be metal or wood as long as the distance between the negative lens 9 and the positive lens 10 is kept constant as described above. However, in the case of metal, the composite lens array 1
The problem that the whole becomes heavy arises. Wood is lighter than metal, but has a problem in that it is incompatible with resin in terms of adhesion to a resin and processing.

As described above, the material used for the light-shielding frame 4 may be selected from the two-dimensional negative lens array 3 and the two-dimensional positive lens array 5 because of the good compatibility with the two-dimensional negative lens array 3 and the processing surface. It is desirable to use the same material as the material used for the two-dimensional positive lens array 5, in this case, an acrylic resin. The resin used for the light-shielding frame 4 is not limited to an acrylic resin, but is a rigid resin having no elasticity, and is compatible with the two-dimensional negative lens array 3 and the two-dimensional positive lens array 5 on the processing surface. Other resins may be used as long as they are good resins. In addition to the acrylic resin used for the light-shielding frame 4, an engineering plastic such as polyacetal or polyamide, a polycarbonate resin, an epoxy resin, or the like may be used.

As described above, the negative lens 9 is a divergent optical system member, and the positive lens 10 is a convergent optical system member. Further, in the present embodiment, for convenience of description, as shown in FIG. 1, a description will be given using a single concave lens for the negative lens 9 and a single convex lens for the positive lens 10. However, each lens may be a set of a plurality of lenses. That is, a divergent lens may be formed from a plurality of lenses, or a convergent lens may be formed from a plurality of lenses. Further, a diffractive lens such as a grating lens may be used for the negative lens 9 and the positive lens 10 instead of the concave lens and the convex lens.

Although the two-dimensional lens array is manufactured by resin molding, as other methods, processing of a lens shape by cutting or manufacturing of a gradient index lens by ion exchange of the substrate surface can be considered. Alternatively, a two-dimensional lens array may be made by attaching a lens on a flat substrate, and the composite lens 2 is placed in a light-shielding lens barrel having a cylindrical portion.
The compound lens array 1 may be configured by a method of arranging the lens barrels in a plane.

As shown in FIG. 2, the compound lens array 1 is disposed between the image display element 6 and the observer's eye 7 so that an enlarged image of the image display element 6 is formed on the eye 7. Has become. At this time, the composite lens array 1 is positioned on the straight line (optical axis 8) connecting the center position X of the image display element 6 and the pupil position E of the eye 7 with the center position H1 of the two-dimensional negative lens array 3 and the two-dimensional positive lens. The lens array 5 is arranged so that the center position H2 is located.

That is, the lens surfaces of the two-dimensional negative lens array 3 and the two-dimensional positive lens array 5 of the composite lens array 1 are substantially parallel to the image forming surface of the image display element 6 and The formed image of compound lens 2 ...
, The image display element 6, the complex lens array 1, and the eye 7 are arranged so as to reach the pupil position E of the eye 7 respectively.

At this time, the distance So between the center position X of the image display element 6 and the center position H1 of the two-dimensional negative lens array 3 is represented by So,
The distance (thickness of the composite lens array 1) Sd between the center position H1 of the two-dimensional negative lens array 3 and the center position H2 of the two-dimensional positive lens array 5, and the center position H of the two-dimensional positive lens array 5
By adjusting the distance Se between 2 and the pupil position E of the eye 7, the observer can observe an enlarged image of the image formed on the image display element 6 via the complex lens array 1.

Here, the object image relationship of the compound lens 2 of the compound lens array 1 will be described below with reference to FIG. The negative lens 9 will be described as one thin concave lens, and the positive lens 10 will be described as one thin convex lens. For convenience of explanation, the opening 4a of the light-shielding frame 4 is omitted in the figure.
Further, the compound lens 2 is arranged such that the principal point 14 of the negative lens 9 and the principal point 15 of the positive lens 10 are on the optical axis 8.

As described above, the compound lens 2 is a combination of the negative lens 9 and the positive lens 10, and is a basic structural unit of the compound lens array 1. Compound lens 2
Is an optical system member which can see an enlarged image of an object with the naked eye by itself.

Therefore, according to this compound lens 2,
As shown in FIG. 3, from the position H1 of the negative lens 9, So (<
0) at a point on the object position Xo (hereinafter, an object point P)
o) from the position H2 of the positive lens 10
A virtual image Pi is formed on a position Xi separated by (<0). This virtual image Pi is a virtual image of the negative lens 9 with respect to the object point Po (hereinafter referred to as an intermediate image Pii).
This is an image obtained when viewed from a position Xe separated by Se (> 0) from the positive lens 10 through the positive lens 10 located at a position H2 separated from S1 by Sd (> 0).

Next, the arrangement of the negative lenses 9 and the positive lenses 10 of the two-dimensional negative lens array 3 and the two-dimensional positive lens array 5 will be described below with reference to FIG.

With respect to a pair of the negative lens 9 and the positive lens 10 constituting an arbitrary compound lens 2, the principal point 14 of the negative lens 9
A straight line 13 connecting the principal point 15 of the positive lens 10 to the optical axis 8 separated by Sc from the principal surface 77 of the two-dimensional positive lens array 5
Each lens is arranged so as to pass through the upper point Xc. At this time, the principal point 1 of each negative lens 9 of the two-dimensional negative lens array 3
4... The distance between each positive lens 10 of the two-dimensional positive lens array 5
The main points 15 are larger than the intervals. This is because the diameter of the negative lens 9 is larger than that of the positive lens 10.

Here, the diopter adjustment is performed by adjusting the position Xi of the image plane 12.
Is performed by moving back and forth. That is, the diopter adjustment is performed based on the distance Sc from the main surface 77 of the two-dimensional positive lens array 5 to the point Xc.
From the main surface 78 of the two-dimensional negative lens array 3 to the object surface 11
By changing the value of the distance So to the position Xo. If the distance between the principal points 14 in the two-dimensional negative lens array 3 and the distance between the principal points 15 in the two-dimensional positive lens array 5 are fixed, changing the distance Sd between the two-dimensional lens arrays Sc
Can be adjusted by moving the position Xo of the object plane 11 and the position H1 of the two-dimensional negative lens array 3.

The two-dimensional negative lens array 3 and the two-dimensional positive lens array 5 have a configuration in which a plurality of negative lenses 9 and positive lenses 10 are formed on a flat substrate. Since 9 and 10 are fixed, the alignment when configuring the composite lens array 1 is facilitated.

Further, each lens 9.
Since 10 is fixed, the diopter can be adjusted by changing the distance between the two-dimensional negative lens array 3 and the two-dimensional positive lens array 5. Therefore, the diopter adjustment of the compound lens array 1 can be easily performed.

Since the two-dimensional negative lens array 3 and the two-dimensional positive lens array 5 are flat, the light shielding frame 4 sandwiched between the two-dimensional negative lens array 3 and the two-dimensional positive lens array 5 is formed. The two-dimensional negative lens array 3 and the two-dimensional positive lens array 5 can be easily held in parallel by adjusting the shape of.

Next, the object image relationship of the compound lens array 1 will be described below with reference to FIG.

The intermediate image P of the object point Po by each compound lens 2
ii are generated as many as the number of complex lenses 2 as shown in FIG. Here, for example, the intermediate image Pii of the compound lens 2a is
This is an intermediate image Piia having the same subscript. These intermediate images Pii
Are observed under the paraxial theory when viewed through the positive lens 10 of the corresponding compound lens 2. Therefore, even if the light emitted from the object point Po enters the eye 7 through the plurality of compound lenses 2, the light is focused on one point on the retina of the eye 7.

That is, light emitted from one point on the object to be observed enters the eye 7 through a plurality of complex lenses 2. Then, the straight line 13 connecting the respective principal points 14 and 15 of the negative lens 9 and the positive lens 10 of each compound lens 2 intersects at a point Xc separated from the two-dimensional positive lens array 5 by Sc.
When the compound lenses 2 are arranged on a plane, under paraxial theory, the images formed by the compound lenses 2 appear to match. That is, even if a light beam emitted from one point of the object to be observed enters the eye 7 through a plurality of compound lenses 2..., The light beam is focused on a single point on the retina. Therefore, it is understood that the composite lens array 1 is a lens in which an object and an image correspond one-to-one.

Further, since the lenses are arrayed, the thickness of each lens can be reduced.
The lens can be made thinner and lighter than a single lens having the same focal length. The reason will be described below.
In general, if the lens diameter is φ ² , the focal length of the lens is f ₀ , the refractive index of the lens is n, and the lens thickness is d ₀ , the following equation (2) is satisfied.

[0151]

(Equation 2)

From the above equation (2), it can be seen that the lens thickness d ₀ increases in proportion to the lens diameter φ ² . Thus, for lenses having the same focal length f ₀ , the smaller the lens diameter φ ² , the smaller the lens thickness d ₀ . Therefore, if a lens in which a plurality of small lens diameters φ ² are grouped is formed into an array and has the same size as the lens diameter φ ² of a single lens, the lens becomes thinner than a single lens having the same focal length as described above. It can be seen that the weight can be reduced.

Further, the distortion and curvature of the image due to the widening of the field of view may be caused, for example, by the focal length of the compound lens 2 around the lens array (the combined focal length of the negative lens 9 and the positive lens 10).
Can be removed by changing.

As described above, the image can be corrected by changing the characteristics of the individual compound lenses 2.

Here, when the intersection of the straight line 13 connecting the principal points 14 and 15 of the negative lens 9 and the positive lens 10 constituting each compound lens 2 does not coincide with the point Xc on the optical axis 8, each compound lens 2 Images disperse inconsistently. However, even if the image is dispersed, there is no problem if it is not recognizable to the naked eye. Because the image P by each compound lens 2
This is because if the variation of each position of i is less than the resolution of the eye 7, the eye 7 recognizes the plurality of images Pi as one point. Therefore, the principal point 14 of the negative lens 9 and the positive lens 10
May not exactly coincide with the point Xc, and the straight lines 13 may not necessarily intersect at one point. Further, even if the variance of the image is larger than the above, depending on the image quality of the object to be observed, it may not be known that the image is scattered. From these circumstances, in the arrangement of the compound lenses 2, in practice, the intersection of the straight line 13 and the point Xc may not exactly match.

Here, the image forming relationship in the compound lens array 1 will be described below with reference to FIG.

First, the symbols used in FIG. 6 will be described below.

Po: Object point (one point with an object to be viewed) Pi: Image point (virtual image of object point formed by compound lens array 1) H1: Main point of first negative lens H2: Main point of first positive lens Point H1a: Main point of second negative lens H2a: Main point of second positive lens Pii: First intermediate image (virtual image of object point formed by first negative lens) Piia: Second intermediate image (second image) F1i: Object-side focal position of the first negative lens F1o: Object-side focal position of the first negative lens F2o: Object-side focal position of the first positive lens F2i: Second F1ia: Image-side focal position of the first positive lens F1ia: Image-side focal position of the second negative lens Xi: Position of the image point on the optical axis 8 Xo: Position of the object point on the optical axis 8 Xii: Optical axis of the intermediate image Xc: the intersection point on the optical axis 8 of the straight line connecting the principal point of the second negative lens and the principal point of the second positive lens. Separation PoXo = Point QH1 So (<0): Object distance (XoH1) Si (<0): Image distance (XiH2) Sii (<0): Intermediate image distance (XiiH1) f1 (<0): First and The focal length of the second negative lens (F
1iH1, H1F1o) f2 (> 0): focal length (H) of the first and second positive lenses
2F2o, F2iH2) Sd (> 0): distance (H2H1) between the main surface of the negative lens and the main surface of the positive lens Sc (> 0): distance XcH2 The symbols above are shown in FIG. In order to prevent the above from becoming complicated, the distance in the direction perpendicular to the optical axis 8 is only defined below.

Yi: Image point height (PiXi) Yo: Object point height (PoXo) Yii: First intermediate image height (PiiXii) Yiia: Second intermediate image height (Pia Xii) Yh1: Negative lens The distance between the first negative lens and the second negative lens for the array (hereinafter referred to as the negative lens distance) (H
1aH1) Yh2: distance between the first positive lens and second positive lens for the positive lens array (hereinafter referred to as positive lens distance) (H
2aH2) In FIG. 6, a plane including the points H1 and H1a and perpendicular to the optical axis 8 is a principal plane 78 common to the negative lens, and a plane including the points H2 and H2a and perpendicular to the optical axis 8 is common to the positive lens. The main surface 77.

For convenience of explanation, the principal points H1 and H2 of the first negative lens and the positive lens are set on the optical axis 8. The combination of the first negative lens and the first positive lens is referred to as a first compound lens. Further, the second negative lens and the positive lens were set away from the optical axis 8.
In particular, the distance between the positive lenses and the height of the second intermediate image were made to match so that Yh2 = Yiia. That is, Piia, which is the object point of the second positive lens, is set on the optical axis 79 of the second positive lens.

Accordingly, Pi which is the image point of the second positive lens
Also appear on the optical axis 79 of the second positive lens, Pi and P
iia and H2a are aligned. This simplifies the derivation of the relational expression indicating the imaging relation.

Here, a general relational expression of the lens will be described with reference to the principal point. First, as for the negative lens, when focusing on the negative lens, the object point is Po, and the image point is Pii or Piia. Therefore, the following equation (3) holds.

[0163]

(Equation 3)

Next, regarding the positive lens, when focusing on the positive lens, the object point is Pii or Piia, and the image point is Pi in common. Therefore, the following equation (4) holds.

[0165]

(Equation 4)

Next, the derivation of the relational expression indicating the imaging relation in the compound lens array 1 based on the above general relational expression of the lens will be described below.

First, paying attention to the second positive lens, the light beam emitted from the object point Po is on the image side of the second positive lens (right side of the main surface 77 of the positive lens in the figure), as if Pi. Acts as if a light beam was emitted. At this time, the line connecting Pi and the principal point H2a of the second positive lens is
It is parallel to the optical axis 79 of the second positive lens. Therefore,
The light ray from Po travels parallel to the optical axis 79 at the principal point H2a.

Next, focusing on the first positive lens, the object point corresponds to Pii. According to the rule regarding the imaging of the positive lens in the paraxial theory, a light ray emitted from the object-side focal position of the lens becomes a light ray parallel to the optical axis 8 on the image side of the lens due to the refraction of the lens. In the figure, the object-side focal position of the first positive lens is F1i. The light ray on the line connecting F1i to the object point Pii of the first positive lens is also a light ray parallel to the optical axis 8 on the right side of the main surface 77 of the first positive lens according to the above-described rule.

As described above, if H2a extends from the line connecting F1i and Pii, the light from Po becomes a light beam parallel to the optical axis 8 from H2a. That is, at H2a, whether the light beam passes through the first positive lens or the second positive lens, the light rays are the same after all. This means that the image point with respect to the object point Pii of the first positive lens and the image point with respect to the object point Piia of the second positive lens are both Pi and common. That is, the image (Pi) can be seen at the same place when viewed through either of the positive lenses.

As described above, it is understood that the condition of the positive lens is that the extension of the line connecting F1i and Pii passes through H2a.

In order to derive a relational expression from the above conditions, attention is paid to a triangle formed by three points F2o, H2a, and H2 in the figure.
The following equation (5) is obtained from the proportional relationship.

[0172]

(Equation 5)

Next, focusing on the negative lens, according to the rule regarding the imaging of the negative lens in the paraxial theory, the height of the intersection Q of the line connecting the image-side focal position of the negative lens and the image of the negative lens with the negative lens is determined. The height is equal to the height of the object Po. Therefore,
Triangle consisting of three points F1i, Q, H1 and three points F1ia, Q, H
Focusing on the triangle 1a, the relational expressions (6) and (7) are obtained from the proportional relationship.

[0174]

(Equation 6)

[0175]

(Equation 7)

From the above equations (5), (6) and (7), the following equation (8) is obtained.

[0177]

(Equation 8)

Further, from the above equation (3), the following equation (9) is obtained.
Is obtained.

[0179]

(Equation 9)

Next, in order to obtain a point Xc on the optical axis 8,
Focusing on a triangle composed of three points H1, H1a, and Xc, the following equation (10) is obtained from the proportional relationship from the triangle and the above equations (8) and (9).

[0181]

(Equation 10)

The above equation (10) is a conditional equation for determining the lens arrangement.

Here, the virtual image Pi is shifted from the principal point H1 of the negative lens.
The distance Si to (Xi on the optical axis 8) is calculated by the following equation (1).
1).

[0184]

[Equation 11]

When Si = −∞, the above equation (11)
Then, the following relational expression (12) is obtained. At this time, Xii =
The position of the object point on the optical axis 8 is determined using F2o.

[0186]

(Equation 12)

Generally, the distance between the lenses forming the two-dimensional lens array closest to the observer depends on the pupil diameter of the naked eye.
An invisible portion of an image is generated due to a gap between lenses forming a two-dimensional lens array and a light-shielding frame.

Such an invisible part of the video appears in the following cases. The light beam emitted from one point of the object is taken over by several adjacent compound lenses 2 and is emitted from each compound lens 2 as a light beam substantially parallel to the viewer's side. At this time, the gap between the lenses of the two-dimensional lens array 3 and the light-shielding frame become a shadow, and places where light reaches and places where light does not reach are formed on the observer side. Then, when the shadow covers the pupil of the naked eye, one point on the object becomes invisible. Therefore, as a whole, a part of the image appears to be hidden.

In order to prevent this, the pupil of the observer only needs to be larger than the shadow. Then, at least one of the light beams coming from the compound lens can be made to enter the pupil.
Here, the gap between the light beams emitted from the adjacent compound lenses is not more than the lens interval of the two-dimensional lens array closest to the observer at the maximum. Therefore, if the distance between the lenses is less than half of the pupil of the observer, the problem that one or more light beams enter the pupil and the image becomes partially invisible can be solved.

Here, in the above-described compound lens array 1, the light flux from the object point to the image side (observer side) will be described below with reference to FIG. The convergence point of the light beam on the image side is at the position of the image Pi. Also, the luminous flux passing through each of the composite lenses 2a, 2b,... Is displayed such that the suffix of the composite lens 2 matches the suffix of the luminous flux 19 like the luminous flux 19a, 19b. Here, there is no light beam passing through the compound lens 2e because the intermediate image Piie is blocked by the light shielding frame 4 when viewed from the positive lens 10e of the compound lens 2e.

As described above, the light flux 19 from the object point Po is discrete because it is blocked by the light shielding frame 4 and the gap between the lenses in the two-dimensional lens array as shown in FIG. If the pupil of the eye 7 is in the gap between the light beam and another light beam, the object point Po cannot be seen. At this time, when the entire object plane 11 is viewed, there is a problem that images appear to be missing or shadows everywhere. In order to solve this problem, the interval between the light beam and the adjacent light beam should be narrowed so that at least one of the light beams from the adjacent compound lenses 2 enters the pupil. The distance between the light beam and the light beam adjacent thereto may be at most twice the distance between the principal points 15 of the positive lens 10. Accordingly, the interval between the principal points 15 of the positive lens 10 may be determined so that the interval between the principal points 15 is equal to or less than half the pupil diameter.

In the above configuration, the compound lens 2 constituting the compound lens array 1 in the present embodiment is an optical system for viewing an image (virtual image) by the negative lens 9 as an image (virtual image) enlarged by the positive lens 10. It is a member. That is, the light from the object to be observed is
And exits the positive lens 10 and reaches the eye 7. In the composite lens array 1, the distance between the lens and the eye is not changed and the distance between the object and the lens can be reduced as compared with a conventional single lens loupe having the same magnification.

Here, the distance between the lens and the eye will be described below, and referring to FIG. 8, the composite lens 2 will have a larger distance between the lens and the eye than the conventional single lens loupe having the same magnification. The fact that the distance does not change and the distance between the object and the lens can be reduced will be described.

First, the lens magnification of a general single lens is defined. In general, the magnification of a lens is determined when the image Pi is at infinity and the user places his or her eye on the image-side focal position of the lens, and is defined by the following equation (13). Here, the magnification of the lens is m, the advancing angle of a light beam emitted from a certain point P on the object to be viewed with respect to the optical axis on the lens image side is t, and the point P is a clear visual distance of 250 mm without a lens.
The angle between the optical axis and the line connecting the point P and the eye when viewed from the same distance is u.

[0195]

(Equation 13)

From the above equation (13), the magnification m of the positive lens having the focal length f can be expressed by the following equation (14) using a clear viewing distance of 250 mm.

[0197]

[Equation 14]

Since the eye is set at the image-side focal position of the lens, the distance from the lens is f. Further, since the image formed by the lens is set at infinity from the definition of the lens magnification, the distance between the object and the lens is also f. At this time, the light beam from the object travels parallel to the optical axis until entering the lens.

Next, the definition of the magnification in the compound lens array 1 in the present embodiment will be described with reference to FIG. Also in this case, it is assumed that the image Pi is placed at infinity. That is, Si = −∞. Positive lens 1 at this time
The traveling angle t of the light beam on the image side of 0 (on the right side of the main surface 77 of the positive lens 10) is expressed by the following equation (15).

[0200]

(Equation 15)

In this case, the position of the eye is set such that the light from the object point Po is parallel to the optical axis 8 as in the conventional lens, and the eye is placed at the point where the ray intersects the optical axis 8 on the image side. To The position of the eye at this time is point Xe in the figure. The distance from the main surface 77 of the positive lens 10 to the point Xe is Se.
This corresponds to the focal length f of the single lens. In this single lens, the distance between the object and the lens was also f. In the present compound lens array 1, the point H2 intersecting the optical axis 8 of the main surface 77, which is the starting point of Se, and the optical axis 8 from the object point Po. Is the distance (Sd-So) from the point Xo vertically lowered to (Sd-So).

Therefore, it can be said that if Sd-So is shorter than Se, the distance between the object and the lens is shorter than in the case of a single lens. The fact that Sd-So is shorter than Se in the present composite lens array 1 will be described below.

The above Se is obtained from the proportional relationship in FIG.
It is represented by the following equation (16).

[0204]

(Equation 16)

On the other hand, when Si is set at infinity, that is, when Si = −∞, So is expressed by the following equation (17) from the above equation (12).

[0206]

[Equation 17]

From the above equation (17), Sd is expressed by the following equation (18).

[0208]

(Equation 18)

From the above equations (16), (17) and (18), Se− (Sd−So)> 0 is proved by the following equation (19).

[0210]

[Equation 19]

Here, f_Two> 0, f₁<0, So <0
So f_Two・ So^Two> 0, So ・ f ₁・ F_Two> 0, So^Two
> 0, f₁ ^Two> 0, So ・ f₁> 0. Therefore, Se
− (Sd−So)> 0.

As described above, the composite lens array 1
It can be seen that the distance between the lens and the eye does not change and the distance between the object and the lens can be reduced as compared with the conventional single lens loupe having the same magnification.

It is desirable to secure a certain distance between the lens and the eye from the viewpoint of legibility. For example, when observing with spectacles, the distance between the lens and the eye needs to be wide. However, a shorter distance between the object surface and the lens is advantageous from the viewpoint of miniaturization. Therefore, the compound lens array 1 according to the present embodiment can shorten the distance between the object and the lens as compared with the conventional lens while maintaining the distance between the lens and the eye, and thus can reduce the optical system and the visibility. It can be said that the optical system has both functions.

Further, since the distance between the image display element 6 and the lens of the present composite lens array 1 is shorter than that of a conventional single lens loupe having the same magnification, the composite lens array 1 is attached to a part of the body such as the head. When the present invention is applied to a portable display device for personal use that is worn to watch television or video images, the position of the image display element 6 in the display device can be brought closer to the eyes of the observer. Also, the center of gravity of the device can be closer to the head. As a result, the feeling of fatigue when the device is worn on the head can be reduced. Also, the burden on the mounting means on the head is reduced, so that the mounting means can be simplified.

Although the present embodiment has been described using thin lenses for the negative lens 9 and the positive lens 10, the present invention is not limited to this, and both the negative lens 9 and the positive lens 10 have a large thickness. The present invention can be applied to a case where a thick lens is used. In this case, as shown in FIG. 9, the principal point of each lens may be two points, the image side and the object side, and the principal surface interval (lens principal point interval) of each lens may be clarified.

The following describes the symbols used in FIG.

H1o: Object-side principal point of the first negative lens H1i: Image-side principal point of the first negative lens H1oa: Object-side principal point of the second negative lens H1ia: Image-side principal of the second negative lens Point H2o: Object-side principal point of the first positive lens H2i: Image-side principal point of the first positive lens H2oa: Object-side principal point of the second positive lens H2ia: Image-side principal point of the second positive lens Sh1 (> 0): distance between the principal surfaces of the negative lens (or the distance between the principal points of the first negative lens) Sh2 (> 0): distance between the principal surfaces of the positive lens (or the distance between the principal points of the first positive lens) The other symbols and reference numerals in the drawing are the same as those used in FIG.

In FIG. 8, a surface on the object side including the points H1o and H1oa and perpendicular to the optical axis 8 is a principal surface 78 common to the negative lens.
a, and a surface on the image side including the points H1i and H1ia and perpendicular to the optical axis 8 is a principal surface 78b common to the negative lens. Also, the point H2
The surface on the object side including o and H2oa and perpendicular to the optical axis 8 is the principal surface 77a common to the positive lens, and includes the optical axes 8 including points H2i and H2ia.
The surface on the image side perpendicular to is a principal surface 77b common to the positive lens.

For the convenience of explanation, the principal points H1o, H1i, H2o, H2i of the first negative lens and the positive lens are set on the optical axis 8. The combination of the first negative lens and the first positive lens is referred to as a first compound lens. Further, the second negative lens and the positive lens were set away from the optical axis 8. In particular, the interval between the positive lenses and the height of the second intermediate image are matched so that Yh2 = Yiia, and the principal points H1oa, H1ia, and H2oa of the second negative lens and the positive lens, respectively.
, H2ia are set on the optical axis 79.

Accordingly, Pi which is the image point of the second positive lens
Also appear on the optical axis 79 of the second positive lens, Pi and P
iia and H2a are aligned. This simplifies the derivation of the relational expression indicating the imaging relation.

Thus, a relational expression similar to the relational expression obtained in FIG. 6 can be obtained for a thick lens.

[Embodiment 2] Another embodiment of a magnifying lens that can be used in the display device of the present invention will be described with reference to FIGS. 10 to 18.
It is as follows. For convenience of explanation, members having the same functions as those in the first embodiment are denoted by the same reference numerals, and the symbols shown in the drawings are also denoted by the same symbols, and description thereof is omitted.

As shown in FIG. 10, the compound lens array 21 according to the present embodiment has a compound lens 22 in which the negative lens 9 and the positive lens 10 having the same lens center axis 27 are combined. As described in the first embodiment, the compound lens 22 functions as shown in FIG. 3, and all the compound lenses 22 are rotationally symmetric with respect to the lens center axis 27.

The compound lens 22 is disposed on a spherical surface centered on a position Xc on the optical axis 8 at a position Sc away from the positive lens 10. Here, the principal point H2 of the positive lens 10 coincides with the spherical surface having the radius Sc, and the principal point H1 of the negative lens 9 coincides with the spherical surface having the radius (Sc + Sd). That is, the composite lens array 21 is obtained by arranging these composite lenses 22 in a spherical shape. Therefore, the lens center axis 27 of any compound lens 22 can be the optical axis 8 of the compound lens array 21. Here, for convenience of description, the optical axis 8 is the lens center axis 27 of the compound lens 22 arranged at the center of the compound lens array 21.

One of the methods of arranging the compound lenses 22 is as follows.
As shown in FIG. 10, the compound lens 22 is
There is a way to put them in a line. At this time, the light-shielding cylinder 24
When the shape of the light-shielding tube 24 is determined so that the extended line 28 of the side line or the ridgeline of the side of the line intersects at Xc,
When the bus lines or ridge lines on the side of 4 are arranged closely together,
The compound lenses 22 are arranged on a spherical surface centered on Xc. That is, when the light-shielding tube 24 is arranged with the generatrix or ridge line of the side surface of the light-shielding tube 24 closely attached, the compound lens 22 is arranged on the spherical surface centering on Xc so that the opening on the negative lens 9 side is formed. The portion is formed so as to be larger than the opening on the positive lens 10 side. Here, the side shape of the light-shielding cylinder 24 is a hexahedral cylinder as shown in FIG.
As shown in FIG. 2, it may be a polyhedral cylindrical shape.

As described above, the present composite lens array 21
Is a light-shielding member having a shape such that an extended line 28 of a side surface or a ridgeline of a side surface of a light-shielding tube 24 serving as a lens barrel that accommodates the compound lens 22 intersects at a point Xc on the optical axis 8 of the compound lens array 21. Are arranged in close contact with the side surfaces of the light-shielding tube 24, so that the negative lens 9 and the positive lens 10, which are accommodated in the light-shielding tube 24, respectively correspond to the point Xc on the optical axis 8. Are arranged on a spherical surface centered at. By arranging the light-shielding cylinders 24 so as to have the above-described shape, the spherical composite lens array 21 can be easily formed.
Can be configured.

Also, since the compound lens 22 has a shape in which the lens central axes 27 of the negative lens 9 and the positive lens 10 are coincident with each other,
A rotating body around the lens center axis 27 can be used. Therefore, when the compound lens is formed into a single lens, the single lens can also be used as a rotating body, which facilitates production.

In addition to the composite lens 22 described above, the composite lens array 21 has a composite lens 32 composed of a single lens 33 as shown in FIGS. 13 (a) and 13 (b).
May be used. This lens 33 has a concave curved surface 33a on one end surface which is a negative lens, and a convex curved surface 33a on the other end surface.
b functions as a positive lens. A cylindrical light-blocking member 34 is provided around the lens 33. FIG. 13B is a sectional view taken along line XX of FIG. 13A.

As described above, by using a single lens as the lens 33 constituting the compound lens 32, the number of lenses is reduced.
Cost reduction can be achieved. The intersection of the generatrix or the ridge line on the side surface of the lens 33 is the optical axis 8 of the complex lens array 21.
The side shape of the lens 33 is determined so as to coincide with the upper point Xc.
The lens 33 can be arranged on a spherical surface centered on the upper point Xc. The lens 3 having the shape as described above
By arranging the three, a complex lens array can be easily formed.

In the case where the compound lens 32 is constituted by a single lens 33 as described above, the light shielding member can be formed by applying a black paint to the side surface of the lens 33 without providing the separate light shielding member 34 as described above. Work as This eliminates the need for the light shielding member 34 for housing the lens 33, so that the configuration of the compound lens array can be simplified and the cost can be reduced.

Further, as the compound lens array 21 in which the compound lenses 22 are arranged in a spherical shape, a two-dimensional negative lens array and a two-dimensional positive lens array are formed on a curved substrate without using the light-shielding cylinder 24. Alternatively, a configuration in which a light shielding frame is interposed therebetween may be used. For example, as shown in FIG. 14, a compound lens array 41 having a configuration in which a light shielding frame 44 is sandwiched between a spherical two-dimensional positive lens array 45 and a two-dimensional negative lens array 43 is conceivable.

The object surface of the compound lens array 41 has a spherical shape.
Is desirably a spherical shape that conforms to the shape of the object surface of the compound lens array 41, that is, the surface on which the two-dimensional negative lens array 43 is formed. This spherical image display element 46 is similar to that shown in FIG.
As shown in FIG. 5, a spherical multilayer matrix wiring substrate 46 is formed.
It was produced by mounting the LED chip 46b on a. In addition, a method of arranging EL elements, fluorescent display elements, and the like in a curved surface, a curved liquid crystal display, a cathode ray tube, or the like may be used. There is also a method in which a lens is attached to the front surface of a flat image display element and its image surface is curved into a spherical shape. Further, by gradually increasing the composite focal length of the compound lens 2 from the center to the periphery of the compound lens array 41, the object surface of the compound lens array 41 is flattened, and the flat image display element 6 can be viewed. You may do it.

The case of observing the spherical object surface of the image display element 46 in the compound lens array 41 will be described below with reference to FIGS.
As in the first embodiment, the negative lens 9 is a thin concave lens, and the positive lens 10 is a thin convex lens. Further, the compound lens 42 is constituted by the negative lens 9 and the positive lens 10.

First, the two-dimensional negative lens array 43 and the two-dimensional positive lens array 45 constituting the compound lens array 41
Will be described.

As shown in FIG. 16, the compound lens array 41 has a principal point H2 of the two-dimensional positive lens array 45 on a spherical surface having a radius Sc centered on Xc and a radius (Sc + S
This is a configuration in which the principal point H1 of the two-dimensional negative lens array 43 is arranged on the spherical surface d).

The object plane of each compound lens 42 is
Since the plane passes through the position Xo which is separated by S (<0) on the lens center axis 27 from the lens, each compound lens 42 has a unique object plane. Therefore, the object surface 47 of the compound lens array 41 is assumed to be a pseudo average of the object surfaces of the compound lenses 42 and is determined on a spherical surface having a radius (Sc + Sd-S) centered on Xc. At this time, the image plane 48 is arranged at a distance of Si from the positive lens 10 of the compound lens 42.

Next, an object image relationship of the compound lens array 41 will be described below with reference to FIG. Object plane 4
The number of intermediate images Pii and the number of compound lenses 42 corresponding to the object point Po on 7 are generated. Here, for example, the intermediate image of the compound lens 42a is an intermediate image Piia having the same subscript. In the figure,
The intermediate image Piid and the intermediate image Piie cannot be seen through the positive lens 10 because they are blocked by the light shielding frame 44. Therefore, the images generated on the image plane 48 by the compound lens array 41 are the images Pia to P
ic.

As described above, the image Pi corresponding to the object point Po appears to be dispersed without being coincident. Such dispersion of the image Pi is as follows.
This is because the object plane of each compound lens 42 does not coincide with the object plane 47 of the compound lens array 41. This can be solved by reducing the lens diameter of the compound lens 42 and narrowing the distance between the principal points of the lens within the same spherical surface. When the lens diameter is reduced, the angle seen by one compound lens, that is, the so-called viewing angle, is reduced.

Therefore, the number of composite lenses 42 that can see the object point Po decreases, and the number of images Pi generated accordingly decreases. When the distance between the principal points is reduced, the lens center axis 27 of each compound lens 42 involved in the generation of the image Pi is reduced.
Is smaller, the variance of the image Pi is smaller. Thus, when the variance of the image is reduced, the image Pi looks like one. For example, the focal length f of the negative lens 9
1 is −15 mm, and the focal length f2 of the positive lens 10 is 20 m
m, lens interval Sd is 10 mm, adjacent compound lenses 4
2 is about 2 degrees, and the diameter of the negative lens 9 is 1 mm, the image P for one object point Po
The dispersion of i falls within about 1 minute in terms of the viewing angle. This is a practically acceptable value.

Next, the light flux from the object point Po to the image side will be described below with reference to FIG. As described above, since all the lens center axes 27 of the compound lens 42 pass through Xc, the light flux 19b passing through Xc is most likely to be the object point Po.
Through the complex lens 42b close to. At this time, since the light beam 19b passes near the central axis of the compound lens 42b, the light beam 19b is hardly affected by aberration of the lens. Therefore, when the eye is placed at the position of Xc, an image with less aberration can be obtained.

Further, even if the composite lens array 41 having a wider apparent field of view is formed by further arranging the compound lenses 42, the image is always viewed by the light flux of the compound lens closest to the object point regardless of the center or periphery of the field of view. An image can be obtained.

By the way, light emitted from one point on the object to be observed enters the eye through a plurality of compound lenses 42.
At this time, the images viewed by each compound lens 42 do not exactly match. This is because the compound lens 42 is arranged on the spherical surface centered on the compound lens Xc on the spherical surface centered on the point Xc, and the object plane of each compound lens 42 is in contact with the spherical surface centered on the point Xc. This is because it becomes a plane. That is, since the tangent planes at different positions on the spherical surface do not match, the object surfaces of the respective compound lenses also do not match.

As described above, since the object planes of the compound lenses 42 do not coincide with each other, the respective images do not coincide with each other in principle. Therefore, the images of the respective compound lenses 42 with respect to one object point are dispersed without being coincident. However, when the lens diameter of the compound lens 42 is reduced, the number of images for one object point is reduced, and the variance of each image can be reduced. Because the compound lens 42
Is composed of at least two lenses, and since each lens plays the role of an aperture stop, the observable range is reduced by reducing the lens diameter. As a result, the number of compound lenses 42 that can see a certain object point is reduced. That is, the number of images for one object point is reduced. Reducing the number of images corresponds to eliminating images with large variance. In addition, when the lens diameter is reduced, the angle between the optical axes of the adjacent compound lenses is reduced, so that the image dispersion is reduced.

Therefore, when the positional shift of each image with respect to the same object point by each compound lens 42 is converted into a visual angle, if the visual angle is equal to or less than the resolving power of the eye, the dispersed image is one image. Be recognized. In this manner, the present optical system can make the object and the image correspond one-to-one by reducing the lens diameter.

When the rotation point of the observer's eye is set at the point Xc, any compound lens 42 can be viewed from the optical axis. The difference disappears. That is, even if the composite lens 42 is arranged in a wide range and the apparent field of view is widened, there is no deterioration of the peripheral image unlike the conventional lens. Also, there is no need to increase the number of lenses for aberration correction.

Further, when the lens diameter of the compound lens 42 is reduced, light passing near the optical axis of the compound lens 42 can be observed, so that a good image with little aberration can be obtained for each compound lens 42. be able to. Also, when the lens system is made smaller, the thickness of the lens is reduced, and the weight of the lens is also reduced.

Therefore, by using a compound lens having a small lens diameter and observing from the vicinity of the point Xc, it is possible to obtain an excellent optical system having a wide apparent field of view, which is small, thin, lightweight, and has little aberration. An image can be provided.

As described above, according to the present composite lens array 41, a wide-field image without deterioration of the image around the lens can be obtained. According to this, since a wide field of view can be realized without increasing the number of lenses in order to widen the field of view unlike a conventional magnifying lens, the size and weight of the display device can be reduced.

In addition, a wide-field image, which was difficult with a conventional lens, can be easily obtained. Further, since the visual field can be widened while keeping the distance between the eye and the lens, the visibility is not impaired with the wide visual field.

[Embodiment 3] Still another embodiment of the magnifying lens that can be used in the display device of the present invention will be described below with reference to FIGS. For the sake of convenience, members having the same functions as those in the first and second embodiments are denoted by the same reference numerals, and the same reference numerals are also used in the drawings, and description thereof is omitted. .

As shown in FIG. 19, the compound lens array 51 according to the present embodiment comprises a light-shielding frame 54 sandwiched between a two-dimensional negative lens array 53 and a two-dimensional positive lens array 55. I have.

The two-dimensional negative lens array 53 is made of a plate-like resin in which the negative lenses 9 are linearly arranged.
The two-dimensional positive lens array 55 is made of a plate-like resin in which the positive lenses 10 are linearly arranged. The light shielding frame 54 is
The through-hole 54a is linearly provided so that the negative lens 9 of the two-dimensional negative lens array 53 and the positive lens 10 of the two-dimensional positive lens array 55 correspond to one body.

Therefore, by sandwiching the light-blocking frame 54 between the two-dimensional negative lens array 53 and the two-dimensional positive lens array 55, each negative lens 9 and positive lens 10 constitute a compound lens. .

When the composite lens array 51 is actually used, for example, as shown in FIG. 20, a linear composite lens array 51 is arranged on a cylindrical surface to form a magnifying lens 50. Since the object surface of the magnifying lens 50 is a cylindrical surface, an image display element 56 having pixels arranged on the cylindrical surface is used. As shown in FIG. 21, this image display element 56
A one-dimensional LED array 57 is arranged on the inner surface 56a of the image display element 56 on a cylindrical surface.
In this embodiment, the LED array 57 is used as a light emitting element, but other light emitting elements may be used. An optical shutter such as a liquid crystal may be used.

The lens arrangement of the one-dimensional compound lens array 51 is in accordance with the first embodiment. And
Although not shown, the one-dimensional compound lens array 51 is arranged so as to be arranged on a cylinder centered on the point Xc on the optical axis, as in the first embodiment. Here, the one-dimensional compound lens array 51 may be a plurality of rows of compound lens arrays.

Further, with respect to the light shielding frame 54 constituting the one-dimensional compound lens array 51, the extension surface of the side surface of the light shielding frame 54 is at a point Xc (FIG. 10) at which the main surface of the two-dimensional positive lens array 55 is separated by Sc. The side shapes are determined so that they intersect.

In the above configuration, in the direction of the generatrix of the cylinder, the compound lens 52 is arranged on a plane, so that the production is easy, and in the circumferential direction of the cylinder, there is little aberration and the wide apparent field of view is easy. Can be obtained. Further, as the linear composite lens array 51 arranged on the cylinder, a composite lens array having the same shape can be used. That is, the composite lens array 5
For 1, a lens array that can be manufactured at low cost by mass production can be used, and therefore, the cost reduction of the entire magnifying lens 50 can be expected.

The magnifying lens 50 for enlarging the cylindrical image display element 56 is a linear compound lens array 51.
Are arranged on a cylinder.
At this time, if the side surface shape of the light-shielding frame 54 as a lens barrel for accommodating the linear compound lens array 51 widens toward the image display element 56, the side surfaces can be easily joined. A configuration in which the compound lens array 51 is arranged on a desired circumference can be formed.

Also, by forming the shape such that the point Xc on the optical axis of the linear magnifying lens 50 coincides with the image-side extended surface of the side surface of the compound lens array 51, the linear compound The lens array 51 can be arranged on a cylinder centered on the Xc.

As described above, like the magnifying lens 50 in the present embodiment, the one-dimensional compound lens array 51
If the magnifying lens 50 is arranged in a cylindrical shape in the horizontal direction of the screen, the viewing angle in the horizontal direction of the screen can be easily increased, which is advantageous in the case of an image display element 56 such as a cinema size. In addition, since the object surface is a cylindrical surface, the one-dimensional image display elements 56 can be arranged on a cylinder, or the planar image display element 56 can be bent on a cylinder to easily make the object surface curved.

[Embodiment 4] The following will describe an embodiment of a display device using the magnifying lens of Embodiments 1 to 3 with reference to FIGS. 22 to 25. For the sake of convenience, members having the same functions as those described in the above embodiments will be denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 22, a display device 61 according to the present embodiment has a substantially U-shaped housing 62.
Inside, an image section 63 as an optical mechanism disposed on the front side, sound sections 64 disposed on both sides, and a control section (not shown) for controlling these sections are provided, and a rear end of the sound section 64 is connected. The configuration includes a band 65. The display device 61 is usually equipped with a video section 63 corresponding to the eyes of the observer and an acoustic section 64 corresponding to the ears, and fixed to the head with the above-mentioned band 65, and a television or video image in front of the eyes. Is to be seen.

In the following description, for convenience of explanation, the drawings in which the band 65 is omitted will be used.

As shown in FIG. 23 (a), the housing 62 has openings 62a, 62a for the observer to observe the image from the image section 63 at the portion where the image section 63 is provided.
Is formed so as to substantially correspond to the distance between both eyes,
In the arrangement portion of the video section 63, openings 62b for the observer to listen to music or the like from the sound section 64 (in the figure,
(The opening 62b corresponding to the left acoustic part 64 is not visible.)
Are formed.

As shown in FIG. 23B, the image section 63 has two openings 62a and 62a of the housing 62.
The image display elements 66L and 66R for displaying images and the enlargement lenses 67L and 67R each including the composite lens array according to the first embodiment for enlarging the images of the image display elements 66L and 66R at positions corresponding to a. This is a configuration including:

The image display elements 66L and 66R are shown in FIG.
As shown in FIG. 4, liquid crystal panels 68L and 68R each including a liquid crystal display element, and liquid crystal panels 68L and 68R
Are illuminated from behind. In addition, the sound section 64 includes speakers 64a and 64b at positions corresponding to both sides 62b and 62b of the housing 62.
64a (FIG. 24) are provided.

That is, the observer observes the image displayed on the image display element 66L disposed on the left side in the figure by the left eye 7L through the magnifying lens 67L on the display device 61, and The left ear 64 (not shown) listens to the sound of the left speaker 64a. Further, the image displayed on the image display element 66R arranged on the right side in the figure by the right eye 7R is
In addition to observation through the magnifying lens 67R, the right ear (not shown) listens to the sound of the right speaker 64a.

[0268] Also, at the approximate center of the housing 62,
A light-shielding partition plate 70 for separating the image section 63 into right and left.
The light from the image section 63 on the left side in the drawing, that is, the light emitted from the magnifying lens 67L via the backlight 69L and the liquid crystal panel 68L is prevented from entering the eye 7R. In addition, light from the video section 63 on the right side in the opposite figure is also prevented from entering the eye 7L.

In the above configuration, since the compound lens array described in the first embodiment is used for the magnifying lens 67, the distance between the lens and the display element, that is, the magnifying lens 6 is used.
The distance between the lens 7 and the image display element 66 can be made shorter than when a single lens is used as an enlarging lens. As a result, the center of gravity of the display device 61 approaches the eye 7 of the observer, and the weight burden on the fixing means (such as the band 65) to the head can be reduced.

Here, when the magnifying lens 67 has a curvature aberration, the curvature of the virtual image can be flattened by bending the projection surface. Further, when the magnifying lens 67 has distortion and the distortion is pincushion type, when the projection lens forms an image having barrel-type distortion opposite to the distortion,
The distortion can be canceled. In this way, by the action of the projection lens and the projection surface, the magnifying lens 67
Can be eliminated without increasing the number of lenses or making the lenses aspherical. Therefore, it is possible to reduce the thickness, weight, and cost of the magnifying lens, and further reduce the size and weight of the display device.

Further, since the projection surface may be a thin plate or a surface utilizing the inner wall of the housing 62 for holding the optical part of the display device, the display device can be made smaller, lighter and thinner.

Also, as shown in FIG. 25, the compound lens array 21 described in the second embodiment may be used as the magnifying lens 67. As described above, when the image display element 26 is formed in a spherical shape and the spherical composite lens array 21 formed along the shape of the display surface of the image display element 26 is used, the image display element 26 has a wide apparent visual field, In addition, it is possible to provide a good image with little aberration. If the image display element 26 is flat to obtain a wide field of view, the focal length of the compound lens may be continuously changed from the center to the periphery of the compound lens array 21 so that the object plane is flat.

Although not shown, a display device using the compound lens array 51 described in the third embodiment for the magnifying lens 67 may be used.
Since an image having a wide field of view in the horizontal direction can be provided, it is suitable for widening the field of view such as a landscape screen image such as a cinema size.

In the present display device 61, by providing video input terminals (not shown) of the image display elements 66L and 66L of the pair of left and right video sections 63, images from different positions with respect to the same object from these video input terminals are provided. By supplying each, two independent images can be seen by the left and right eyes of the observer. In other words, if images from the different positions for the same object are supplied from the video input terminal to the display device 61, the two
A stereoscopic image can be obtained by viewing the images captured by the two cameras with the left and right eyes, respectively.

Further, a system may be incorporated in the display device 61 in which an acceleration sensor is incorporated to detect the movement of the head and the viewpoint of the image changes according to the movement of the head.

As described above, by incorporating the acceleration sensor, the rotation and movement of the head are measured by the acceleration sensor attached to the display device 61 when the display device 61 is fixed to the observer's head. can do. Thus, by changing the viewpoint in the image viewed by the observer according to the rotation and the movement amount, the observer is given a sense as if the image is present in the image.

As for the sensation existing in the video, it is important that the apparent field of view of the video and the quality of the image be good, in addition to the change in the viewpoint of the video. These can be easily solved by using various techniques of the present invention.

In this embodiment, when the display device 61 is fixed to the body such as the head, the display device 61 is fixed to the body by a band 65 provided at the rear end of the housing 62. It is not limited to.
For example, the housing 62 may be configured as a helmet or eyeglasses, or may be configured to have no particular means of attachment to the head as in binoculars, and to be viewed with hands or other fixing means. No problem.

[Embodiment 5] An embodiment of a display device of the present invention will be described below with reference to FIGS. For the sake of convenience, members having the same functions as those described in the above embodiments will be denoted by the same reference numerals, and description thereof will be omitted. In the description of the display device, since the sound unit has been described in the fourth embodiment, only the image unit will be described. The same applies to the following embodiments.

The display device according to the present embodiment
As shown in FIG. 26, an image display element 71 and an image display element 7 each including a liquid crystal panel 73 composed of a liquid crystal display element and a backlight 72 arranged on the back of the liquid crystal panel 73.
An image composed of a projection lens 74 for projecting the image formed in 1 in an enlarged manner, a screen 75 for projecting the image of the image display element 71, and an enlargement lens 76 for enlarging the image projected on the screen 75. Part.
As the magnifying lens 76, in addition to the single lens loupe, a combination of a plurality of lenses or the compound lens array described in the first to third embodiments may be used.

That is, as shown in FIG. 27, in the image portion of the display device having the above structure, the image formed on the liquid crystal panel 73 is illuminated from the back by the backlight 72, and is projected on the screen 75 by the projection lens 74. Projection plane 75
a is enlarged and projected. The image enlarged and projected on the screen 75 is enlarged and projected by the enlarging lens 76, is arranged on the opposite side of the enlarging lens 76 from the position where the screen 75 is arranged, and is enlarged on the optical axis 8. Image is formed by the eye 7 arranged at the focal position of the lens 76.

That is, the display device having the above configuration is
The image of the image display element 71 is projected on the projection surface 75a of the screen 75 by the projection lens 74, and the projected image is observed by the enlargement lens 76.

Light from the image display element 71 (hereinafter, referred to as image light) is efficiently reflected by the projection surface 75a of the screen 75, and enters the eye 7 through the magnifying lens 76, as shown in FIG. It is desirable.

However, in general, the screen 75
A white scattering surface is used as the projection surface 75a. According to the screen 75 using the white scattering surface, the image light is scattered and reflected as shown in FIG. Therefore, the image light actually observed is
A part of the scattered light reflected by the screen 75 is used. That is, as shown in FIG. 28, a part of the scattered light when the light from the image display element 71 is reflected on the projection surface 75a only enters the eye 7 via the magnifying lens 76.

However, the projection surface 7 of the screen 75
When a screen 75 having a saw-toothed reflecting surface 75b whose surface is finely processed as shown in FIG. 29B is used instead of the white scattering surface 5a as shown in FIG.
The reflection angle of the reflected light can be controlled by changing the shape of the saw blade 5b. Thus, light can be guided to the magnifying lens 76 without scattering light on the screen 75 shown in FIG. 29B, so that image light can be used efficiently. The saw blade-shaped reflecting surface 75b at this time
If is a mirror surface, it can be used more efficiently.

In the case of the configuration in which the projected image is observed with the magnifying lens 76 as described above, for example, as shown in FIG. Distorted enlarged image swelling around (solid line)
30B, an image in which the projected image (solid line) shrinks around the normal image (broken line) in contrast to the enlarged image as shown in FIG. By correcting the projection image projected on the screen 75 such that the following condition is satisfied, it is possible to cancel the distortion in the magnifying lens 76 itself. In this case, when correcting the projection image for the distortion of the magnifying lens 76, the shapes of the projection lens 74 and the projection surface 75a of the screen 75 may be appropriately adjusted.

In the display device having the above structure, the light from the image display element 71 is projected on the screen 75, and the projected image is observed through the magnifying lens 76. 7
Only 5 is required, and there is no need to dispose the image display element 71. In addition, the screen 75 can be made thinner and lighter than a liquid crystal display panel or an image display element such as a self-luminous element, and thus has an effect of reducing the weight in front of the display device. Therefore, the thickness of the entire display device can be reduced and the weight in front of the eyes can be reduced, so that the load on the head of the observer can be reduced.

Further, in the above configuration, since an image is formed by projection, it is easy to form an image on a curved surface. In the following embodiments, examples in which a scanning optical system is used to form a projection image on a curved projection plate will be described.

[Embodiment 6] Another embodiment of the display device of the present invention is described below with reference to FIGS.

As shown in FIG. 31, the present display device according to the present embodiment has a one-dimensional display element 81 as an image display element, and a projection for enlarging and projecting an image formed by the one-dimensional display element 81. Lens 82, triangular prism-shaped polygon mirror 83 (three reflecting surfaces), polygon mirror 83 that deflects by rotating the image of one-dimensional display element 81
And a projection unit 85 for projecting the light deflected by the projection plate 85, and an enlargement lens 76 for enlarging a projection image of the projection plate 85. Incidentally, as the magnifying lens 76, similarly to the fifth embodiment, in addition to the single lens loupe, a combination of a plurality of lenses or the first embodiment is used.
3 may be used.

As the one-dimensional display element 81, as shown in FIG. 32, an LED array 86 in which a plurality of LEDs 86a are arranged in a straight line is used. The projection plate 85 has a projection surface 85a having a predetermined curvature.

That is, in the image section of the display device having the above-mentioned structure, the blinking of the LEDs 86a in the LED array 86 of the one-dimensional display element 81 is deflected by the polygon mirror 83 via the projection lens 82, and the predetermined curvature is obtained. Projected on a projection surface 85a of a projection plate 85 having the same. Therefore,
In the above-mentioned display device, an image is formed on the retina of the eye 7 using the afterimage phenomenon. That is, the light blinked by the one-dimensional display element 81 continuously scans a linear image formed on the projection plate 85 by the polygon mirror 83 as a scanning optical system in the scanning direction of the projection plate 85. Thus, the image is recognized as one image by the afterimage phenomenon of the eye 7.

An image scanned and formed by the display device has a cylindrical surface centered on the polygon mirror 83. In this case, this cylindrical surface and the projection surface 8 of the projection plate 85
Since there is a possibility that 5a does not match, in such a case, a correction lens for correcting the curvature of the image formed by the polygon mirror 83 so as to be the same as the curvature of the projection surface 85a of the projection plate 85. It is necessary to arrange 84 between the projection plate 85 and the polygon mirror 83.

The above correction is desirably performed by an f · θ lens. The f · θ lens has a function of making the image forming position of the projection image coincide with the projection plane and a function of making the scanning speed on the projection plane constant. However, if the projection plane is on a spherical surface centered on the polygon mirror, the image formation position after projection substantially coincides with the projection plane without correction, so that a correction lens such as an f · θ lens is unnecessary.

According to the above arrangement, the display pattern of the one-dimensional display element 81 as a display element for displaying a part of the image is projected onto the projection surface 85a, and the projected image is scanned to scan the image. Is formed. Here, the scanning is performed by a polygon mirror 83 as an optical path deflecting unit. Then, the image formed on the projection surface 85a is observed through the magnifying lens 76.

The optical path deflecting means is not limited to the polygon mirror 83 as long as it has the function of deflecting the light from the one-dimensional display element 81. A member for deflecting the optical path by vibration or rotation, for example, The mirror may be attached to a member that vibrates by an electromagnetic action, an electrostatic action, a piezoelectric effect, or the like, or the above-described vibrating member may have a reflective function by depositing Al.

[0297] The present display apparatus is not a conventional method in which direct light from a display pattern is imaged on the retina and scanned, but is a method in which an image is formed on the projection surface 85a and scanned. Although the center of rotation for scanning by the conventional method had to be located at the rotation point of the eye, according to the present apparatus, the center of rotation for scanning may be located at the center of rotation of the polygon mirror 83 as the optical path deflecting means. Scanning over a wide range is possible without any problem.

Further, the width of the apparent field of view does not depend on the scanning range, but depends on the apparent field of view of the magnifying lens 76 for viewing an image on the projection surface formed by scanning.
Scanning does not limit the apparent field of view. Therefore, if the complex lens array described in the first to third embodiments is used as the magnifying lens 76, not only can the field of view be widened, but also the size and size can be reduced.
Lightening can also be achieved.

Further, the one-dimensional display element 81 is not limited to the LED array 86, but may be any one that can display a one-dimensional image, and may be a one-dimensional or one-dimensional light-emitting element or an optical shutter. . Therefore, if these members are used as the one-dimensional display element 81, the size and weight of the display device can be reduced.

In place of the magnifying lens 76, FIG.
As shown in FIG. 7, a magnifying lens 50 may be used in the third embodiment. In this case, the light from the one-dimensional display element 81 is projected and scanned on the projection surface 85a of the cylindrical projection plate 85 centered on the position of the eye 7 on the optical axis of the magnifying lens 50 (point Xc in FIG. 10). Configuration.
At this time, since the polygon mirror 83 is not located at the center of curvature of the projection plate 85, a correction lens 84 for correcting the image forming position is arranged between the one-dimensional display element 81 and the projection plate 85.

The image formation on the projection surface 85a may be performed by two-dimensional scanning of a point light source other than the one shown in the figure. The point light source at this time may be an LED or a pseudo point light source obtained by applying a pinhole mask to a lamp. However, if a coherent light source such as a semiconductor laser is used, a high-resolution image can be formed.

[Embodiment 7] FIGS. 34 to 43 show still another embodiment of the display device of the present invention.
This will be described below.

[0303] The display device according to the present embodiment comprises:
As shown in FIG. 34, the image display device includes an image display element 71, a projection lens 74, a half mirror 91 as an optical path separating unit, an enlargement lens 76, and a screen 75.

The screen 75, the enlarging lens 76, and the half mirror 91 are arranged in order such that their respective centers, that is, the image center, the lens center, and the mirror center are on the optical axis 8. Among them, the screen 75 and the magnifying lens 76 are arranged so that the surfaces are substantially parallel. In addition, the half mirror 91 moves the optical axis 8 so that the reflection surface 91a is separated from the lens surface of the magnifying lens 76.
Are arranged at a predetermined angle with respect to. further,
The reflecting surface 91 of the half mirror 91 which is perpendicular to the optical axis 8
On the optical axis 92 passing through the center of the a-side mirror, the projection lens 74 and the image display element 71 are arranged so as to pass through the respective lens centers.

That is, the display device projects the display pattern of the image display element 71 composed of a liquid crystal display panel onto the projection surface 75a of the screen 75 by using the projection lens 74 composed of a single lens and the enlarging lens 76. This is an optical mechanism for observing an image with the magnifying lens 76. Here, a single lens is used for both the projection lens 74 and the enlargement lens 76, but the invention is not limited to this, and both the projection lens 74 and the enlargement lens 76 converge an optical system of condensing light. For example, it may be a combination of a plurality of lenses, a diffractive lens, or the compound lens array described in the first to third embodiments.

Further, since a liquid crystal display panel is used as the image display element 71, the backlight is illuminated from behind. The screen 75 has a white scattering surface.

[0307] In the display device having the above structure, the magnifying lens 76 is used for projecting an image, so that the image can be projected from the front of the screen 75. Thereby, the distortion of the projected image on the projection surface 75a of the screen 75 can be reduced as compared with the case where the image is projected from an oblique direction without passing through the magnifying lens 76.

However, since the projected image is also observed from the front of the projection surface 75a, the image display element 71 and the projection lens 74 may obstruct the observation.

Therefore, in the present display device, the half mirror 91 as the optical path separating means is connected to the projection lens 74.
The optical path from the image display element 71 to the projection plane 75a (first optical path) and the optical path from the projection plane 75a to the eye 7 of the observer (second optical path) And separation. That is, the image display element 7
The optical path from 1 to the projection surface 75a is bent by the reflection of the half mirror 91, and the optical path from the projection surface 75a to the observer's eye 7 is set to pass through the half mirror 91.

Here, as shown in FIG. 35, an optical path from the image display element 71 to the projection surface 75a is a principal ray A, and an optical path from the projection surface 75a to the observer's eye 7 is a principal ray B. . The principal ray A is defined as a ray perpendicular to the image display element 71, and the principal ray B is defined as a ray passing through the center of the entrance pupil of the eye 7. In the case of a wide-field-type display device, the principal ray B may be defined as a ray passing through the rotation point of the eye 7.

In the display device having the above-described structure, the half mirror 91 is provided between the magnifying lens 76 and the eye 7 so as to separate the optical path A for projection from the optical path B for viewing an image. I have. Here, as described above, the optical path A starts from the image display element 71, and sequentially passes through the projection lens 7
4, an optical path through the half mirror 91 and the magnifying lens 76 to the projection surface 75a. The optical path B is a projection surface 75
a, the magnifying lens 76 and the half mirror 9 in this order.
1 is an optical path leading to the eye 7. At this time, the optical path A is bent at 90 degrees by the half mirror 91,
Go to 5a. The optical path B is a half mirror 9
1 is transmitted. In this way, the optical path A and the optical path B are made to coincide or approach only between the half mirror 91 and the projection surface 75a.

[0312] Therefore, by projecting and observing the image from the front of the projection plane, it is possible to eliminate asymmetric distortion of the image.
And the optical path B need to be close to or coincide with each other. Therefore, even if the optical path A and the optical path B match, the optical path is separated by the half mirror 91 so that the image display element 71 and the projection lens 74 do not overlap the eye 7.

The image forming relationship in the display device having the above configuration will be described below with reference to FIGS. 36 and 37. In FIG. 36, a collection of light rays from a certain point 71a on the image display element 71 to the projection surface 75a of the screen 75 via the projection lens 74, the half mirror 91, and the enlargement lens 76 is shown as a light flux A.
A collection of light rays from one point 93 on the projection surface 75a of the screen 75 to the eye 7 via the magnifying lens 76 and the half mirror 91 is defined as a light flux B.

When the convergence point 94 of the light beam A by the projection lens 74 shown in FIG. 36 coincides with the plane on which the virtual image 96 is generated by the magnifying lens 76 shown in FIG. Projection surface 7
The image 93 converges on 5a. Also, the projection surface 75
An image 93 formed on a is formed at a certain point 95 on the retina of the eye 7 via the magnifying lens 76.

As described above, according to this display device, an image is projected by projecting the light emission pattern on the image display element 71 onto the projection surface 75a using the two lenses, the projection lens 74 and the enlargement lens 76. Is formed. That is, the image forming position of the display pattern by the projection lens 74 is not on the projection surface 75a, but on the projection surface 75a.
The virtual image position (FIG. 37) of the image on FIG.
Point 96).

Therefore, the display pattern formed by the image display element 71 is composed of the projection lens 74 and the magnifying lens 76.
An image is formed on the projection surface 75a by the two lenses, and an image is formed. The image is viewed with the magnifying lens 76.

As a result, the image viewing direction and the projection direction for image formation can both be performed from the front of the projection surface 75a of the screen 75. Therefore, it is possible to suppress asymmetric distortion of an image that occurs when the image is formed obliquely.

Further, since projection is performed using the magnifying lens 76, there is no problem that the magnifying lens 76 blocks the optical path for projection. Since the range in which the image can be projected and the range in which the image can be viewed both depend on the apparent viewing angle of the magnifying lens 76, by expanding the apparent visual field of the magnifying lens 76, a wide area corresponding to the apparent visual field is obtained. An image can be formed in the area.

[0319] In the display device having the above structure,
Although the half mirror 91 is used as the optical path separating means, the optical path A and the optical path B may be separated using the polarization state of the light beam instead of the half mirror 91. For example, a polarization filter for extracting light of a specific polarization state of the image display element 71 and an optical rotator having an angle difference of 90 ° between linearly polarized light incident on the projection surface 75a and linearly emitted light are orthogonal to each other. An optical path separating means including a polarization splitting element that reflects one of the two linearly polarized lights and transmits the other linearly polarized light may be configured. In this case, the polarization filter is disposed on the output surface side of the liquid crystal display panel used for the image display element 71, the optical rotator is disposed immediately before the projection surface 75a, and the polarization separation element is disposed on the half mirror 91.
Shall be placed instead of

As the polarizing element, a phase shifter, an optical rotator or the like may be used in addition to the above, and each of these polarizing elements is formed of a crystal, a polymer sheet, a thin film or the like. Alternatively, it is configured in combination with a diffraction grating.

[0321] Light separation when the optical path separating means having the above configuration is used will be described. It is assumed that light extracted from a polarization filter provided in a liquid crystal panel as the image display element 71 is linearly polarized light A. The linearly polarized light A is reflected by the polarization splitting element provided in place of the half mirror 91, and is incident on the projection surface 75a. Therefore, the projection surface 75a
The linearly polarized light A is converted into orthogonal linearly polarized light B by the optical rotator arranged immediately before the above. This linearly polarized light B passes through the polarization splitting element. In this way, the optical path is separated. According to such separation of the optical path, light loss due to separation of the optical path can be reduced as compared with the half mirror 91.

Here, in the above display device,
As shown in FIG. 38, instead of the above-described magnifying lens 76,
A display device using the composite lens array 41 described in the second embodiment and using a projection plate 97 instead of the screen 75 will be described below.

The projection plate 97 is formed in a substantially spherical shape along the surface shape of the two-dimensional positive lens array 45 on the projection side.
The projection surface 97a is provided on the composite lens array 41 side, and has a structure in which an image formed by the composite lens array 41 can be appropriately projected on the projection surface 97a.

In FIG. 39, the optical path from the image display element 71 to the projection surface 97a is defined as a principal ray A.
The optical path from 7a to the eye 7 of the observer is defined as a principal ray B. In FIG. 40, an arbitrary point 71 of the image display element 71 is shown.
a from the light path A to an arbitrary point 98 on the projection surface 97a.
1, and an optical path from an arbitrary point 98 on the projection surface 97a to the observer's eye 7 is a light ray B1.

Here, a principal ray A incident on a certain point 98 on the projection surface 97a and a principal ray B starting from the point 98b
Is symmetrical with respect to the normal 99 of the projection surface 97a at the point 98, as shown in FIG.
And the light beam B1 satisfy Snell's law for the projection surface 97a, so that the projection surface 97a can be regarded as a mirror surface.

FIG. 39 shows a case where the principal ray A and the principal ray B coincide with the normal 99 of the projection surface 97a, which satisfies the above-mentioned symmetric relationship. In such a case, FIG. 40 shows a path from the one point 71a of the image display element 71 to the eye 7.

From the above, since the principal ray A and the principal ray B satisfy Snell's law of reflection at the point 98 on the projection plane 97a, the rays A1 and A1 from the image display element 71 to the projection plane 97a are The ray B1 which is a reflected ray is the eye 7
On the retina 7a. That is, light emitted from one point 71a on the image display element 71 is projected onto the projection surface 97a.
And the reflected light is condensed on one point 100 on the retina 7a. When the projection surface 71a is a mirror surface as described above, the display surface of the image display element 71 is directly viewed, so that light from the image display element 71 can be efficiently transmitted to the eye 7.

Even if the projection surface 75a as shown in FIG. 42 is a plane, if the above condition is satisfied, as shown in FIG. 43, the relationship symmetrical with respect to the normal 99 of the projection surface 75a at the point 98 is obtained. Then, the light beam A1 and the light beam B1 are projected onto the projection surface 75a.
Satisfies Snell's law, so that the projection surface 75a can be regarded as a mirror surface.

[Embodiment 8] FIGS. 44 to 46 show still another embodiment of the display device of the present invention.
This will be described below. For convenience of explanation, members having the same functions as the members used in each of the above-described embodiments will be denoted by the same reference symbols, and description thereof will be omitted.

[0330] The display device according to the present embodiment comprises:
As shown in FIG. 44, as the image display element, instead of the image display element 71 shown in FIG.
A one-dimensional display element 81 using an array is used, and an image section for forming an image by optical path deflection by a polygon mirror 83 as optical path deflecting means is provided.

That is, the image light from the one-dimensional display element 81 is applied to the polygon mirror 83 rotating in the direction of the arrow via the projection lens 82 and the slit 87. The image light deflected by the polygon mirror 83 is reflected by the half mirror 91, and is scanned and enlarged and projected on the projection surface 97 a of the projection plate 97 via the composite lens array 41.

Here, the one-dimensional display element 81 and the projection surface 97
intersection 88 of the principal ray A to the polygon mirror 83
The case where the point of intersection and the intersection 89 of the principal ray B from the projection surface 97a to the eye 7 substantially match will be described below with reference to FIGS. 45 and 46. In this description, as shown in FIG.
The case where the virtual image 90 of the point intersection 88 on the projection plane 97a with respect to the half mirror 91 matches the intersection 89 is shown.

In the above configuration, the polygon mirror 83
Becomes the intersection 88, and the intersection 88
46 coincides with the intersection 89 of the principal ray A shown in FIG. 46, the scanning plane 100a in FIG. 45 and the object plane 100b in FIG. 46 match from the reversibility of the optical system. Therefore, the correction lens required for image formation by scanning becomes unnecessary.

In the case where a projected image is formed by using the composite lens arrays 1, 41, and 51 as the magnifying lens in the image portion of the display device having the above configuration,
When the width of the light beam from the one-dimensional display element 81 reaches the positive lens 10, an image defect may occur on the projection surface 97a unless the distance between adjacent positive lenses 10 is twice or more.

Therefore, the projection lens 83 needs to have a diameter sufficient to obtain the width of the light beam. In the present embodiment, the pupil diameter of the observer's eye is assumed to be about 2 mm, and the interval between adjacent positive lenses 10 in the compound lens array is set to 1 mm. Therefore, the width of the light beam of the projection light is set to be at least twice the interval. However, if the luminous flux of the projection light is too large, the projected image may be blurred when the composite lens arrays 41 and 51 are used. Therefore, in the present embodiment, a slit 87 having an opening diameter of 3 mm is arranged between the projection lens 82 and the half mirror 91 in order to limit the width of the light beam of the projection light. At this time, since about 9 to 12 compound lenses 2 are related to one point of the one-dimensional display element 81 to generate an image, a projected image is not lost. Also,
The blur of the image can be reduced to a level that causes no practical problem.

In the display device having the above configuration, the display pattern of the one-dimensional display element 81 for displaying a part of the image is projected on the projection surface 9 by using the projection lens 82 and the enlarging lens 41.
7a. Then, an image is formed by scanning the projected image on the projection surface 97a.

The scanning is performed by a polygon mirror 83 serving as a rotating optical path deflecting means. Then, the image formed on the projection surface 97a is observed through the magnifying lens 41.

Since the projected image formed by the scanning is located on the rotating body having the polygon mirror 83 as the center, if the projected surface 97a does not coincide with this, it is necessary to correct the deviation of the projected position. A correction lens is required. According to this configuration, the center of deflection of the optical path A by the polygon mirror 83 or the virtual image of the half mirror 91 thereof substantially coincides with the convergence point of the optical path B. And the projection surface 97a match. That is, the magnifying lens 41 also serves as a correction lens.

The projection plane 97a passes from the one-dimensional display element 81 to the projection lens 82 and the composite lens array 41.
The light rays reaching to the eye 7 are reflected on the projection surface 97a and pass through the complex lens array 41 to the eye 7. At this time, the reflection of the light beam follows Snell's law. That is,
Since not the diffused light from the one-dimensional display element 81 but the direct light enters the eye 7, a brighter image can be obtained.

Since the light from the one-dimensional display element 81 forms an image on the projection surface 97a, even if the projection surface 97a is a curved surface, the magnification of the image (virtual image) viewed by the composite lens array 41 does not change.

The projection surface 97a is preferably a mirror surface, but may be a diffusion surface. At this time,
Since the specularly reflected light, in which the light power is concentrated among the diffused light on the projection surface 97a, enters, a bright image can be obtained.

Further, in a display device in which an image on the projection surface 97a is enlarged and viewed by the compound lens array 41, a curved surface image can be easily obtained by forming an image on the curved projection surface 97a. It is easy to construct an object plane for observation with a compound lens array in which compound lenses are arranged on a curved surface or a cylinder.

[0343]

The display device according to the first aspect of the present invention
As described above, in a display device in which an image is formed and an optical mechanism for observing the image with the naked eye is arranged in front of the observer, the optical mechanism includes an image display element and the image is projected. A screen, a projection lens that projects an image on the image display element onto the screen,
The configuration includes at least a magnifying lens for visually observing an enlarged image of the image projected on the screen.

Therefore, an image is formed by projecting the display pattern of the image display device onto a screen, and the image is observed through the magnifying lens. Therefore, the curvature aberration and distortion of the magnifying lens are obtained. Aberrations and the like can be easily corrected. Therefore, there is no need to complicate the lens configuration for correction.

Furthermore, since the image is displayed on the projection surface, the center of gravity of the display device can be brought closer to the head, so that the fixing means for fixing the device to the head or the like can be simplified, and the weight of the device can be reduced. Can be achieved. Also, there is an effect that a curved surface image can be easily obtained.

[0346] As described above, the display device according to the second aspect of the present invention is arranged between the projection lens and the screen in addition to the configuration of the first aspect, and transmits light from the image display element via the projection lens. And an optical path deflecting means for deflecting and scanning on the screen to form an image.

Therefore, since an image is formed by scanning, a fine image display can be obtained without depending on the image display area. In addition, a wide-angle image can be formed due to the configuration. Further, it is easy to form an image on a curved surface. further,
Since a display pattern for forming an image may be a point or a linear light emitting element, an optical shutter, or the like, the size and weight of the apparatus can be further reduced.

[0348] According to the display device of the third aspect of the present invention, as described above, in the display device in which an optical mechanism for forming an image and observing the image with the naked eye is arranged in front of the observer, The mechanism includes an image display element,
A screen on which an image is projected, a projection lens for projecting the image on the image display element onto the screen, and at least a magnifying lens for viewing an enlarged image of the image projected on the screen with the naked eye, The enlargement lens is arranged on an optical path from the projection lens to a screen.

Therefore, since projection for image formation and observation of an image can be performed from the front with respect to the projection surface of the screen, it is possible to eliminate asymmetric distortion of the image in image formation and observation. It works.

According to the display device of the fourth aspect of the present invention, as described above, in addition to the configuration of the third aspect, the optical mechanism includes:
This configuration is provided with an optical path separating unit that separates a first optical path from the image display element to the screen and a second optical path from the screen to the eyes of the observer.

Therefore, in addition to the effect of the third aspect, by separating the first optical path and the second optical path,
There is an effect that it is possible to prevent the optical components related to the projection from blocking the field of view.

As described above, the display device of the fifth aspect of the present invention has a configuration in which a polarizing element is used for the optical path separating means in addition to the configuration of the fourth aspect.

Therefore, in addition to the effect of the structure of the fourth aspect, there is an effect that a decrease in the amount of light due to the separation of the optical path can be suppressed.

As described above, the display device of the invention of claim 6 is arranged between the projection lens and the magnifying lens in addition to the constitution of claim 3, 4 or 5, and the image is transmitted through the projection lens. This configuration includes an optical path deflecting unit that deflects light from the display element and scans the screen to form an image.

Therefore, in addition to the effects of the third, fourth or fifth aspect, since there is no distortion due to scanning, a correction lens for correcting the distortion can be eliminated.
Accordingly, since the optical mechanism can be simplified, the size and weight of the device can be reduced.

According to the display device of the invention of claim 7, as described above, in addition to the constitution of claim 3, 4, 5 or 6, the projection surface of the screen is formed in a mirror-like shape.
On the projection surface of the screen, the incident light of the first optical path from the image display element to the screen and the reflected light of the second optical path from the screen to the eyes of the observer satisfy the Snell's law of reflection. Of the first and second optical paths are set.

Therefore, in addition to the effect of the configuration of the third, fourth, fifth or sixth aspect, since the direct image of the image display element is viewed, a bright image can be provided.

As described above, in the display device according to the eighth aspect of the present invention, in addition to any one of the first to seventh aspects, the main surfaces of a plurality of negative lenses are arranged on the same plane as an enlarging lens. Two-dimensional negative lens array, and a two-dimensional positive lens array in which the main surfaces of a plurality of positive lenses are arranged on the same plane, are arranged to face each other so that each negative lens and positive lens constitute a compound lens This is a configuration that uses a complex lens array.

Therefore, since a curved surface image can be easily obtained by forming an image on a curved projection surface, according to the image formation by projection, the object surface required by the magnifying lens can be easily provided. It has the effect of being able to do so.

As described above, in the display device of the ninth aspect of the present invention, in addition to the configuration of the eighth aspect, the compound lens array may be arranged such that the principal point distance between the lenses of the compound lenses closest to the observer's eye is The configuration is such that it is set to be equal to or less than half the diameter of the light beam from one point on the image display element to the complex lens array.

Therefore, it is possible to prevent the gap between the compound lenses of the compound lens array, the lack of the projected image caused by the light blocking action by the light blocking frame or the lens barrel, or the like.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a compound lens array as an enlargement lens according to an embodiment that can be used in a display device of the present invention.

FIG. 2 is a sectional view of the complex lens array shown in FIG.

FIG. 3 is an explanatory diagram showing an object-image relationship of a compound lens constituting the compound lens array shown in FIG. 1;

FIG. 4 is an explanatory diagram showing a lens arrangement of the complex lens array shown in FIG.

FIG. 5 is an explanatory diagram showing an object image relationship of the complex lens array shown in FIG.

FIG. 6 is an explanatory diagram showing an image forming relationship in the complex lens array shown in FIG.

7 is an explanatory diagram showing a light beam from an object point on an object plane to an image side in the compound lens array shown in FIG. 1;

FIG. 8 is an explanatory diagram showing a definition of magnification in the complex lens array shown in FIG.

FIG. 9 is an explanatory diagram showing an image forming relationship in a compound lens array when a thick lens is used for each of a negative lens and a positive lens constituting the compound lens.

FIG. 10 is a schematic cross-sectional view of a compound lens array according to another embodiment that can be used in the display device of the present invention.

11 is a perspective view illustrating an example of a lens barrel that accommodates a compound lens provided in the compound lens array illustrated in FIG.

FIG. 12 is a perspective view showing another example of a lens barrel that accommodates a compound lens provided in the compound lens array shown in FIG.

FIG. 13 is an explanatory diagram showing a compound lens composed of one lens.

14 is a schematic configuration diagram of a compound lens array showing another example of the compound lens array shown in FIG.

15 is an enlarged view of a main part on the display surface side of an image display element adapted to the complex lens array shown in FIG.

16 is an explanatory diagram showing a lens arrangement of the complex lens array shown in FIG.

17 is an explanatory diagram showing an object image relationship of the complex lens array shown in FIG.

18 is an explanatory diagram showing a light beam from an object point on the object plane to the image side in the compound lens array shown in FIG.

FIG. 19 is a schematic exploded view of a one-dimensional compound lens array according to still another embodiment that can be used in the display device of the present invention.

20 is a schematic configuration diagram of an enlarging lens including the one-dimensional compound lens array shown in FIG.

21 is an explanatory diagram showing an image display element applied to the magnifying lens shown in FIG.

FIG. 22 is a schematic configuration diagram of a display device according to an embodiment using the magnifying lenses of Embodiments 1 to 3.

23 is a schematic configuration diagram of a display device using the complex lens array shown in FIG. 1 as a magnifying lens in the display device shown in FIG. 22;

24 is a sectional view of the display device shown in FIG.

25 is a schematic cross-sectional view of a display device using the complex lens array shown in FIG. 10 as a magnifying lens in the display device shown in FIG.

FIG. 26 is a schematic configuration diagram of a display device according to an embodiment of the present invention.

FIG. 27 is an explanatory diagram showing an optical path of the display device shown in FIG. 26;

FIG. 28 is an explanatory diagram showing reflection of a light beam on a projection surface of the display device shown in FIG. 26;

FIG. 29 is an explanatory diagram showing reflection control on the projection surface of the display device shown in FIG. 26;

FIG. 30 is an explanatory diagram showing image distortion caused by a general lens.

FIG. 31 is a schematic configuration diagram of a display device using a scanning optical system in the display device shown in FIG. 26;

32 is an explanatory diagram showing an image display element applied to the display device shown in FIG.

FIG. 33 is a schematic configuration diagram showing a display device when the enlargement lens shown in FIG. 20 is used as the enlargement lens in the display device shown in FIG. 31;

FIG. 34 is a schematic configuration diagram of a display device according to another embodiment of the present invention.

35 is an explanatory diagram showing an optical path in the display device shown in FIG. 34.

36 is an explanatory diagram showing a first optical path from an image display element to a projection plane in the display device shown in FIG.

FIG. 37 is an explanatory diagram showing a second optical path from a projection surface to an eye in the display device shown in FIG. 34.

38 is a schematic configuration diagram of the display device shown in FIG. 34 when the complex lens array shown in FIG. 14 is used as an enlarging lens.

FIG. 39 is an explanatory diagram showing an optical path in the display device shown in FIG. 38.

FIG. 40 is an explanatory diagram showing light rays reflected from the image display element of the display device shown in FIG. 38 on the projection surface and reaching the eyes.

FIG. 41 is an explanatory diagram showing a light reflection state on the projection plane shown in FIG. 40;

FIG. 42 is an explanatory diagram showing light rays reflected from the image display element on the projection surface and reaching the eyes when the projection surface is flat.

FIG. 43 is an explanatory diagram showing a light reflection state on the projection plane shown in FIG. 42;

44 is a schematic configuration diagram of a display device when a scanning optical system is used for the display device shown in FIG. 38.

FIG. 45 is an explanatory diagram showing deflection of a principal ray by scanning and an image plane formed in the display device shown in FIG. 40;

FIG. 46 is an explanatory diagram showing principal rays from a projection plane to eyes in the display device shown in FIG. 40;

FIG. 47 is a schematic configuration diagram showing a conventional display device.

FIG. 48 is an explanatory diagram showing an object image relationship of a general magnifying lens.

FIG. 49 is an explanatory diagram showing an object-image relationship of a magnifying lens corresponding to a wide field of view.

FIG. 50 is a schematic configuration diagram showing an optical portion of a display device using a conventional scanning optical system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 compound lens array (magnifying lens) 2 compound lens 3 two-dimensional negative lens array 4 light-blocking frame (light-blocking member) 5 two-dimensional positive lens array 6 image display element 7 eye (eye) 8 optical axis 9 negative lens 10 positive Lens 14 Principal point 15 Principal point 19 Light flux 21 Composite lens array (enlargement lens) 22 Composite lens 24 Light-shielding tube (barrel) 26 Image display element 32 Composite lens 33 Lens (single lens) 41 Composite lens array (Magnifying lens) 42 Composite lens 43 Two-dimensional negative lens array 44 Light-shielding frame (light-shielding member) 45 Two-dimensional positive lens array 46 Image display element 50 Magnifying lens 51 Composite lens array 53 Two-dimensional negative lens array 54 Light-shielding frame ( 55) Two-dimensional positive lens array 56 Image display element 61 Display device 63 Image unit (optical mechanism) 6 Image Display Element 67 Magnifying Lens 71 Image Display Element 74 Projection Lens (Projection Lens) 75 Screen 75a Projection Surface 76 Magnification Lens 77 Main Surface 78 Main Surface 81 One-Dimensional Display Element 83 Polygon Mirror (Optical Path Deflection Means) 84 Correction Lens 85 Projection plate (screen) 85a Projection surface 86 LED array 91 Half mirror (optical path separating means) 97 Projection plate (screen) 97a Projection surface

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) G03B 21/00 G03B 21/00 E 21/10 21/10 Z

Claims (9)

[Claims] 1. A display device in which an optical mechanism for forming an image and observing the image with the naked eye is disposed in front of an observer, wherein the optical mechanism is configured to project an image display element and an image. A screen, a projection lens that projects the image on the image display element onto the screen, and at least a magnifying lens for viewing an enlarged image of the image projected on the screen with the naked eye, Display device. 2. A light source, which is disposed between the projection lens and a screen and passes through the projection lens, from an image display element.
2. The display device according to claim 1, further comprising an optical path deflecting unit that deflects and scans on a screen to form an image. 3. A display device in which an optical mechanism for forming an image and observing the image with the naked eye is disposed in front of an observer's eyes, wherein the optical mechanism projects an image display element and an image. A screen, a projection lens for projecting the image on the image display element onto the screen, and at least a magnifying lens for viewing an enlarged image of the image projected on the screen with the naked eye, wherein the magnifying lens is And a display device disposed on an optical path from the projection lens to a screen. 4. The optical mechanism is provided with an optical path separating means for separating a first optical path from the image display element to the screen and a second optical path from the screen to the eyes of the observer. The display device according to claim 3, wherein 5. The display device according to claim 4, wherein a polarizing element is used for said optical path separating means. 6. An optical path deflecting means disposed between the projection lens and the magnifying lens, for deflecting light from an image display element via the projection lens and scanning on a screen to form an image. 5. The method according to claim 3, wherein
Or the display device according to 5. 7. A projection surface of the screen is formed in a mirror shape, and incident light of a first optical path from an image display element to the screen is formed on the projection surface of the screen.
The said 1st and 2nd optical path is set so that the reflected light of the 2nd optical path from a screen to an observer's eye may satisfy Snell's law of reflection, The said 3rd, 4th, The characterized by the above-mentioned. 7. The display device according to 5 or 6. 8. A two-dimensional negative lens array in which the main surfaces of a plurality of negative lenses are arranged on the same plane, and a two-dimensional array in which the main surfaces of a plurality of positive lenses are arranged on the same plane. The positive lens array uses a compound lens array arranged to face each other so as to form a compound lens with the respective negative lens and positive lens.
The display device according to any one of claims 7 to 10. 9. The compound lens array according to claim 1, wherein the principal point interval between the lenses closest to the observer's eye is less than half the diameter of a light beam from one point on the image display element to the compound lens array. 9. The display device according to claim 8, wherein the display device is set.