JPH10288959A - Head mounted type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head mounted type display device capable of making mounting feeling excellent by improving the weight balance of the whole device and being prevented from being damaged by the interference with peripheral obstacles and the like. SOLUTION: A reflection surface 10 arranged between a display part 2 emitting light for displaying a picture at the side part of the head of the observer 5 and the eyes of an observer 5 and a diffraction surface 11 arranged in front of the eyes of the observer 5 are formed at an optical path changing surface forming part 3 bent along the outside circumference of the head of the observer 5 between the side parts of the head and the front part of the eyes of the observer 5 so that the light for displaying a picture can be guided to the eyes of the observer 5 by being diffracted after being reflected. Then, a holding part 4 holding the display part 2 and the forming part 3 is mounted on the head part of the observer 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head-mounted display device having a display section for emitting image display light on the side of the observer's head.

[0002]

2. Description of the Related Art In recent years, display devices mounted on an observer's head have begun to be used in various fields. In a conventional head-mounted display device, a display unit and a complicated optical system are arranged in front of an observer's eyes in order to secure a wide field of view for visually recognizing a display image, and image display light is transmitted through a complicated optical path. After being guided to the observer's eyes. As a result, the display unit and the optical system protrude greatly from the head of the observer, and the weight balance of the entire apparatus is poor and the wearing feeling is poor. In addition, when work is performed while the head-mounted display device is mounted, there is a high possibility that the protruding portion interferes with surrounding obstacles or the like and is damaged.

An object of the present invention is to provide a head-mounted display device that can solve the above-mentioned problems.

[0004]

According to the present invention, there is provided a head-mounted display device comprising: a display section for emitting image display light on a side of a head of an observer; An optical path changing surface forming portion bent along the outer periphery of the head between the
A holding unit that holds the display unit and the optical path changing surface forming unit and is attached to the observer's head, and is disposed between the display unit and the observer's eyes on the optical path changing surface forming unit. Reflection surface and the diffraction surface arranged in front of the observer's eyes,
The image display light is formed so that it can be guided to the observer's eyes by diffracting after reflecting the image display light.

According to the structure of the present invention, the image display light emitted from the display section on the side of the observer's head is reflected by the reflecting surface disposed between the display section and the observer's eyes. After that, the image can be visually recognized by the observer by diffracting the light by the diffraction surface arranged in front of the observer's eyes. Thus, the display unit having a large weight can be arranged beside the head of the observer. Further, the optical path changing surface forming portion on which the reflection surface and the diffraction surface are formed is bent along the outer periphery of the head between the side of the observer's head and the front of the eyes, so that the observer's head is The amount of protrusion forward from the part can be reduced.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

A head mounted display 1 shown in FIGS. 1 and 2
Is a display unit 2, a visor (optical path changing surface forming unit) 3,
And a holding unit 4.

In the present embodiment, the holder 4 is provided with an observer 5.
And a band shape to be worn by being fitted to the outer periphery of the head. The display unit 2 and the visor 3 are held by the holding unit 4. The form of the holding portion 4 is not limited as long as it can be mounted on the head of the observer 5, and may be, for example, a helmet or a hat, or is limited to a device directly mounted on the head. Instead, it may be worn via a hat or a helmet. In the present invention, the head refers to a portion above the neck including the face.

The display unit 2 is arranged on one side of the head of the observer 5 and connected to an image signal source (not shown) constituted by a computer or the like via a signal cable 2a.
Based on the image signal, the image display light L is emitted forward as indicated by the dashed line in the figure. The display unit 2 can be configured by, for example, a liquid crystal display with a backlight, a CRT display, or the like. Note that a lens system may be built in the display unit 2 and the image display light L may be emitted through the lens system.

The visor 3 is bent along the outer periphery of the head between both sides of the head of the observer 5 and in front of both eyes. The other end is supported by the holding portion 4 on the other side of the head. This visor 3
Can be configured by, for example, bending a flat acrylic substrate along a peripheral surface of an elliptical cylinder having a major axis radius of 130 mm and a minor axis radius of 100 mm in plan view.

On the visor 3, a reflecting surface 10 arranged between the display unit 2 and the eyes of the observer 5 and a diffraction surface 11 arranged in front of one eye of the observer 5 are formed. ing. The image display light L emitted from the display section 2 is reflected by the reflection surface 10 and then diffracted by the diffraction surface 11 to be guided to one eye of the observer 5. Thereby, the observer 5 can visually recognize the display virtual image formed by the image display light L, and also can visually recognize the real entity ahead by the light transmitted through the diffraction surface 11.

The diffraction surface 11 is, for example, as shown in FIG. 3A, a photosensitive material such as a photoresist is coated on a flat acrylic substrate 3 'which is a constituent material of the visor 3, and the photosensitive material is exposed. It is obtained by exposing the material by a two-beam interference method using a laser beam of a certain wavelength (for example, 488 nm), and developing interference fringes for diffracting the image display light L to generate a hologram as described above. The reflection surface 10 can be obtained by forming a metal reflection film such as aluminum on the acrylic substrate. Furthermore, the diffraction surface 1
A silicon oxide film or the like is formed as a protective film 12 on the hologram constituting the reflective surface 1 and the reflective film constituting the reflective surface 10. Thereafter, the visor 3 is obtained by bending the acrylic substrate as shown in FIG. 3 (2). In addition, 2
When the hologram is generated by the light beam interference method to form the diffraction surface 11, it is preferable that the laser beam for exposure is spread by an optical system designed so that aberration is reduced as much as possible. .

According to the above configuration, the image display light L emitted from the display unit 2 on the side of the head of the observer 5 is transmitted to the display unit 2.
After being reflected by the reflecting surface 10 disposed between the observer 5 and the eyes of the observer 5, the image is visually recognized by the observer 5 by being diffracted by the diffractive surface 11 disposed in front of the eyes of the observer 5. be able to. Thereby, the display unit 2 having a large weight can be arranged on the side of the head of the observer 5. Further, the visor 3 on which the reflection surface 10 and the diffraction surface 11 are formed is bent along the outer periphery of the head between the side of the head of the observer 5 and the front of the eyes. The amount of projection from the head forward can be reduced. Therefore, the head-mounted display device 1
Is improved in the overall weight balance to provide a good feeling of wearing, and is prevented from being damaged by interference with surrounding obstacles and the like. In addition, the visor 3 has a reflection surface 10 and a diffraction surface 11.
By also using the forming part, the number of parts can be reduced and the weight can be reduced.

Note that the present invention is not limited to the above embodiment. For example, it may be constituted by a computer generated hologram obtained by calculating interference fringes on a diffraction surface and performing printing or mechanical processing. Further, the reflection surface may be constituted by a dielectric multilayer film. Further, the head-mounted display device of the above-described embodiment is for one eye, but may be for two eyes in which the display unit, the reflection surface, and the diffraction surface are provided at symmetrical positions about the body axis. Good. Further, the visor of the above embodiment is curved along the outer periphery of the head between the sides of the observer's head and the front of both eyes, but between the side of the observer's head and the front of one eye. It is enough if it is bent along the circumference of the head. In addition, the visor of the above embodiment is curved along the peripheral surface of the elliptical cylinder in plan view, but may be bent along the outer periphery of the head, for example, a spherical surface, a cylindrical surface, an aspheric surface, a prism. It may be bent along. The material of the visor is not particularly limited, and transparent plastic or glass may be used.

[0015]

According to the present invention, the head-mounted display can improve the weight balance of the entire body and improve the feeling of wearing, and can prevent damage due to interference with surrounding obstacles and the like. Equipment can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a head-mounted display device according to an embodiment of the present invention.

FIG. 2 is a plan view of the head-mounted display device according to the embodiment of the present invention.

FIGS. 3A and 3B are explanatory diagrams of a main part of a head-mounted display device according to an embodiment of the present invention; FIGS.

[Explanation of symbols]

 Reference Signs List 2 display unit 3 visor (optical path changing surface forming unit) 4 holding unit 5 observer 10 reflecting surface 11 diffraction surface

Claims (1)

[Claims] 1. A display section for emitting image display light on the side of the observer's head, and an optical path changing surface formed along the outer periphery of the head between the observer's head side and the front of the eyes. And a holding unit that holds the display unit and the optical path changing surface forming unit and is mounted on the observer's head. The optical path changing surface forming unit includes a display unit and an observer's eye. The reflection surface disposed between the light source and the diffraction surface disposed in front of the observer's eye is formed so that the image display light can be guided after being reflected and then diffracted. A head-mounted display device comprising: