JPH05257111A - Video display device - Google Patents

Abstract

PURPOSE:To provide a glass type video display device capable of further enlarging the video of a color liquid crystal panel without enlarging the magnification of an eyepiece. CONSTITUTION:An inverting V-shaped reflecting mirror 4 is attached on a bridge part in a device main body 2. A fluorescent tube 5 is arranged on the upper part of the reflecting mirror 4. The pair of color liquid crystal panels 6 and 6 is respectively set in a standing state on both sides of the reflecting mirror 4. A condenser lens 7 is nearly integrally arranged on the each liquid crystal panel 6. A pair of parabolic mirrors 10 and 10 is arranged between the pair of condensers 7 and 7 and the pair of eyepieces 9 and 9 in the device main body 2. Thus, the video of each color liquid crystal panel 6 is reflected and enlarged by each parabolic mirror 10, and also is enlarged by each eyepiece 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle-type image display device capable of magnifying an image such as a video image using a color liquid crystal panel (LCD).

[0002]

2. Description of the Related Art For example, the applicant has disclosed Japanese Patent Application No. 3-239120, which is an eyeglass-type image display device capable of viewing video images using an LCD. This similar structure will be briefly described with reference to FIGS. The pair of side frame portions 3 and 3 attached to the pair forms an eyeglass type. An inverted V-shaped reflecting mirror 4 is attached on the inverted V-shaped nose pad 2a in the center of the lower part of the apparatus body 2. A fluorescent tube (light source) 5 is provided above the reflecting mirror 4.
And a pair of color liquid crystal panels (image display means) 6, 6 are provided upright on both sides of the reflecting mirror 4 so as to straddle the nose pad 2a. A convex condenser lens (objective lens) is provided on each of the liquid crystal panels 6 via a deflection plate 8.
The liquid crystal display panel 7 and the liquid crystal panel 6 are arranged substantially integrally. Further, a pair of convex eyepieces 9 and 9 are arranged on the left and right eyeballs A and A in the apparatus body 2, respectively, and a pair of condenser lenses 7 and 7 in the apparatus body 2 are provided. A pair of rectangular plate-shaped plane mirrors (reflecting mirrors) are provided between the pair of eyepieces 9 and 9.
10 'and 10' are arranged respectively. Incidentally, 3 in FIG.
Reference numeral a is a headphone attached to each side frame portion 3.

Then, as shown in FIG. 6, the eyeglass-type image display device 1 is mounted on the face and a pair of eyepieces 9 and
Looking at 9, the image projected on the pair of liquid crystal panels 6, 6 from a small portable VTR (not shown) is illuminated by the fluorescent tube 5, and the pair of condenser lenses 7, 7 to the pair of reflecting mirrors 10 '. , 10 'and a pair of eyepieces 9 and 9 to project on the retinas a of the left and right eyeballs A and A. As a result, as shown in FIG. 6, the enlarged virtual image (image) S'can be seen.

[0004]

However, in the above-mentioned conventional image display apparatus 1, since the eyepiece lens 9 mainly controls the enlargement of the image produced by the color liquid crystal panel 6, the eyepiece is used for enlarging the image. If the magnification of the lens 9 is increased, the aberration becomes large, which may cause fatigue of the eyeball A and deterioration of the visual acuity during long-time use, which makes it impossible to endure long-time use. The magnification of the eyepiece lens 9 is limited due to the clear visual distance, and if the eyepiece lens 9 is composed of a plurality of lenses in order to eliminate aberration, it becomes difficult in terms of space. Further, the video display device 1 is considered to be mainly used for leisure such as outdoors or in a vehicle, and unless it has a powerful screen, it lacks impact and there is nothing appealing to the user as a product.

Therefore, the present invention provides an image display device capable of enlarging and viewing an image without increasing the magnification of the eyepiece and without causing aberration or distortion.

[0006]

[MEANS FOR SOLVING THE PROBLEMS] A light source,
An image display device comprising: a transmissive image display means illuminated by the light source, wherein an image of the image display means is projected onto a retina of an eyeball through a reflecting mirror and an eyepiece lens. It is composed of an object mirror. Also,
According to a second aspect of the invention, the image display means is composed of a liquid crystal panel.

[0007]

The image on the image display means is reflected and expanded by the parabolic mirror and also expanded by the eyepiece. This allows
The image is enlarged without increasing the magnification of the eyepiece. As a result, the magnification of the image is generally higher than that of the conventional one, and a further enlarged image can be seen without eye strain.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. The same parts as those of the conventional structure are designated by the same reference numerals, and detailed description thereof will be omitted. Further, FIG. 6 is incorporated.

In FIG. 1, reference numeral 1 denotes a spectacle-type image display device, in which an inverted V-shaped reflecting mirror 4 is mounted on a nose pad 2a in a device body 2, above the reflecting mirror 4. In which a fluorescent tube (light source) 5 is arranged, and a pair of color liquid crystal panels (image display means) 6, 6 are provided upright on both sides of the reflecting mirror 4 so as to straddle the nose pad 2a. The convex condenser lens (objective lens) 7 is arranged substantially integrally with each liquid crystal panel 6 as in the conventional configuration.

A pair of parabolic mirrors (reflecting mirrors) 10 are arranged between the pair of condenser lenses 7 and 7 and the pair of eyepieces 9 and 9 in the apparatus main body 2, respectively. There is. Each of the parabolic mirrors 10 is a kind of concave mirror which is curved inward in a circular arc shape. Further, on the front side of each parabolic mirror 10, as shown in FIGS.
It is arranged almost integrally with 0. In addition to the role of changing the optical path C, each of the parabolic mirrors 10 also has a role of enlarging an image formed by each color liquid crystal panel 6, so that a large angle of view can be obtained. This angle of view is the focal length of the lens that is most often used in snapshots, 40 mm to 60 m.
The angle of view of m is set to be 50 ± 10 ° and is set to be larger (the angle of view of the virtual image magnified by the conventional eyepiece lens 9 is limited to 60 °).

Each of the condenser lenses 7 serves to correct the curvature of the image, that is, distortion aberration, to condense the backlight (fluorescent tube 5) and to make the image uniform. Further, each of the eyepieces 9 controls the enlargement of the image and the correction of the curvature of the image in a pair with the condenser lens 7. Furthermore, each of the above parabolic mirrors 10
The image to be magnified, that is, the image of each color liquid crystal panel 6 is set on the optical axis of each parabolic mirror 10 and the optical axis of each eyepiece 9 as much as possible (the image is from the optical axis of the parabolic mirror 10). If away, use an axial parabolic mirror).

Further, in FIG. 3, L is a clear vision distance (50
0 mm), M is a virtual image plane, and S is a parabolic mirror 10 as a reflecting mirror.
Shows the horizontal size of the image when S is used, and S'denotes the horizontal size of the image when the plane mirror 10 'is used as the reflecting mirror. Further, in FIG. 4, S ₀ is the vertical size of the image on the color liquid crystal panel 6, S is the vertical size of the image when the parabolic mirror 10 is used as the reflecting mirror,
S'denotes the vertical size of the image when the plane mirror 10 'is used as the reflecting mirror, F _M denotes the focus of the parabolic mirror 10, and F _S denotes the focus of the eyepiece 9.

According to the eyeglass-type image display device 1 of the above embodiment, the image S formed by the pair of color liquid crystal panels 6 and 6 is displayed.
₀ is reflected and magnified by a pair of parabolic mirrors 10 and 10, and
The pair of eyepieces 9 and 9 are also enlarged. The virtual image S of the image magnified by the pair of eyepieces 9 and 9 comes to the position of the virtual image plane M at the clear visual distance L. As a result, an image S ₀ of each color liquid crystal panel 6 is shown in FIGS. 3 and 4 without increasing the magnification of each eyepiece lens 9 (the magnification of the eyepiece lens 9 is limited due to the clear viewing distance L). In addition, the conventional plane mirror 10 '
The image can be further enlarged in the left-right and up-down directions than the image S'when using. Therefore, the image S ₀ of each color liquid crystal panel 6 can be enlarged as a whole as compared with the conventional one, and the image S enlarged in the vertical and horizontal directions can be enlarged by the retinas a of the left and right eyes A, A. It can be projected and viewed.

As described above, since the image display device 1 can widen the angle of view to view a wide screen,
As shown in, when the image display device 1 is mounted on the head, a powerful screen that is the same as when watching a movie in a movie theater is provided, and a magnified image S with a sense of reality can be enjoyed. In addition, the image was magnified optically (eyepiece lens 9
The magnification S of the image is not so large) that the enlarged image S has little aberration and distortion, and there is no problem from a medical point of view. Furthermore, since the magnification of the eyepiece lens 9 is suppressed, even if the position of the eyeball A deviates from the optical axis of the eyepiece lens 9, vignetting is less likely to occur and the optical system is easy to see. Furthermore,
Since the clear viewing distance L is protected, it can be worn and used for a relatively long time, and the eyeball A is not fatigued.

Although the eyeglass-type image display device has been described in the above embodiment, it goes without saying that the image display device can be applied to a viewfinder of a camera-integrated VTR. Further, although the fluorescent tube is used as the light source, a miniature electric bulb may be used. Further, the image display means is not limited to the color liquid crystal panel.

[0016]

As described above, according to the present invention, the apparatus main body is provided with the light source and the transmission type image display means illuminated by the light source, and the image of the image display means is used as the reflecting mirror. In the image display device for projecting on the retina of the eyeball through the eyepiece lens, since the reflecting mirror is composed of a parabolic mirror, the image of the image display means can be reflected / enlarged by the parabolic mirror. It can be enlarged with an eyepiece as well. As a result, the image on the image display means can be viewed further enlarged than the conventional one without increasing the magnification of the eyepiece.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a video display device showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a main part of the video display device.

FIG. 3 is a comparative explanatory diagram of the horizontal size of a virtual image of the optical system of the image display device.

FIG. 4 is a comparative explanatory diagram of the vertical size of a virtual image of the optical system.

FIG. 5 is a schematic configuration diagram of a conventional video display device.

FIG. 6 is a perspective view showing a usage state of a conventional image display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Image display device 2 ... Device body 6 ... Liquid crystal panel (image display means) 9 ... Eyepiece lens 10 ... Parabolic mirror (reflection mirror) A ... Eyeball a ... Retina

Claims (2)

[Claims] 1. A light source and a transmissive image display means illuminated by the light source are provided in the main body of the apparatus, and an image of the image display means is projected on a retina of an eyeball through a reflecting mirror and an eyepiece. In the image display device as described above, the reflection mirror is configured by a parabolic mirror. 2. The image display device according to claim 1, wherein the image display means is a liquid crystal panel.