JPH08122698A - Head mounted display - Google Patents

Abstract

PURPOSE: To finely adjust the interval of a video display part by providing a mechanism which freely connects and disconnects two hollow feed screws and an adjusting knob and moving two video display modules integrally or individually. CONSTITUTION: Hollow shafts 2L and 2R which have a counterclockwise male screw and a clockwise male screw are supported rotatably by one guide shaft 3. Further, a friction driving part consisting of two sleeves 5 which are pressed against the end surfaces of the hollow shafts 2L and 2R to rotate together with the guide shafts, a compression coil spring which is arranged between the sleeves 5, and the adjusting screw 4 which is fitted onto the outer peripheral part so as to rotate the sleeves 5 is provided between the hollow shafts 2L and 2R. When the adjusting knob 4 is rotated, its turning force is transmitted to the respective right and left sleeves 5, whose turning forces are transmitted to the hollow shafts 2L and 2R. The video display modules 1, therefore, move by the same distance in the mutually opposite directions through the rotations of the counterclockwise and clockwise male screws cut in the outer peripheral parts of the hollow shafts 2L and 2R.

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 (hereinafter referred to as an HMD) which can be worn on the head to view video information, and the like, and which is used for both eyes of a user who mounts the HMD on the head. The present invention relates to a mechanism for adjusting the position of the image display unit, which makes the interval of the image display unit (image display module) of the HMD correspond to the interval.

[0002]

2. Description of the Related Art In recent years, with the development of image display devices such as liquid crystal panels, various types of image display devices have been developed. One of them is a head mounted display (HMD), and various types have been commercialized.
For example, JP-A-5-268547 and JP-A-5-3
Japanese Patent No. 44451, Japanese Patent Application Laid-Open No. 5-328256, Japanese Patent Application Laid-Open No. 5-328408, and the like have been proposed, but these do not have an interpupillary adjustment mechanism.

[0003]

Most of the conventional HMDs do not have an effective adjusting mechanism for finely adjusting the pupil distance, and the adjustment is made with respect to the human pupil distance, which is very different. It had a problem that it was difficult to do.

The present invention has been made in order to solve such a problem and is capable of fine adjustment of the interval of the image display portion in accordance with the eye width of a human who is not symmetrical and has various variations.
The purpose is to provide D.

[0005]

In order to solve the above-mentioned problems, the present invention provides a liquid crystal panel and a lens by providing a mechanism for freely connecting and disconnecting two hollow feed screws and an adjusting knob. Two video display modules for displaying a video configured by the above or the like can be integrally or individually movable.

[0006]

With the above structure, the distance between the two image display modules can be freely changed, so that it is possible to make various adjustments and make fine adjustments corresponding to the pupil distances of humans who are not symmetrical.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An eye width adjusting device for an HMD according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an essential part of the HMD, showing a state in which the interpupillary distance can be adjusted integrally on the left and right sides.

FIG. 2 is also a sectional view of the main part of the HMD, showing a state in which only one side of the image display module can be adjusted by pushing the end face of the guide shaft 3.

In FIGS. 1 and 2, a video display module 1 is composed of optical system parts such as a liquid crystal panel and a lens, and enlarges and displays a video. Further, the image display modules 1 are used as a set of two corresponding to both eyes. A hollow shaft 2L having a left male screw and a hollow shaft 2R having a right male screw for individually moving the image display module 1.
And are rotatably supported by one guide shaft 3. Further, the present apparatus is provided with the two hollow shafts 2L,
Two sleeves 5 that press the respective end surfaces of the hollow shafts 2L and 2R between the 2Rs and rotate integrally with the guide shaft.
And a compression coil spring 6 arranged between the sleeves 5,
A friction drive unit is provided which comprises an adjusting knob 4 fitted to the outer periphery of the two sleeves 5 as they rotate.

In FIG. 1, when the adjusting knob 4 is rotated, its rotational force is transmitted to each of the left and right sleeves 5, and the transmitted rotational force is transmitted to the hollow shafts 2L and 2R pressed by the respective left and right sleeves 5. To be done. As a result, 2
By rotating the left and right male screws cut on the outer peripheral portions of the hollow shafts 2L and 2R, the left and right image display modules 1 move in opposite directions by the same distance.

With the above configuration, it is possible to adjust the interpupillary distance by changing the distance between the two video display modules 1. However, it is desirable that the two image display modules 1 can be individually moved in order to make finer adjustments to the pupil distance of a human who is not necessarily a left-right object.

In FIG. 2, by pushing the end portion of the guide shaft 3, the pushed sleeve 5 moves together with the guide shaft 3. The hollow shaft 2R on the pushed side is released from the pressing of the sleeve 5. As a result, the rotational force from the adjusting knob 4 is transmitted to only one hollow shaft 2L via the sleeve 5, and only one (left side in FIG. 3) image display module 1 is moved.
With the above operation, it is possible to adjust only one of the video display modules 1.

By utilizing the above function, the left and right image display modules 1 can be finely adjusted individually.

[0015]

As described above, according to the present invention, the image display module can be integrally moved to the left or right or separately to the left and right by the feed screw driven by frictional force. As a result, it is possible to easily perform fine adjustment corresponding to each human eye width that is not symmetrical and has a wide range of variations.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an HMD according to an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of an HMD according to an embodiment of the present invention.

FIG. 3 is a sectional view of an HMD according to an embodiment of the present invention.

[Explanation of symbols]

 1 Image Display Module 2 Hollow Shaft 3 Guide Shaft 4 Adjustment Knob 5 Sleeve 6 Compression Coil Spring

Claims (3)

[Claims] 1. A hollow shaft having a left male screw and a hollow shaft having a right male screw are rotatably supported by one guide shaft, and a friction drive member is arranged between the two hollow shafts. A head mounted display characterized in that a space between two image display modules screwed into the hollow shaft is made wide and narrow by making the hollow shaft rotatable by frictional force. 2. The head mounted display according to claim 1, wherein the image display module comprises a liquid crystal panel and a lens optical system. 3. The friction drive unit comprises two sleeves for pressing the end surface of the hollow shaft, a compression coil spring arranged between the sleeves, and an adjusting knob fitted to an outer peripheral portion so as to rotate the sleeves. The head mounted display according to claim 2, wherein