JPH01133019A - Helmet mount display - Google Patents

Abstract

PURPOSE:To enable the visual recognition of information at about 40 deg. angle of field by disposing an optical path refracting mirror between a front side lens system and rear side lens system constituting a Petzval type lens system and disposing a telescope of a low magnification between the Petzval type lens system and a half mirror. CONSTITUTION:The information displayed on a display face 2a is emitted in the form of the collimated beams of light of about 20 deg. angle of field by the Petzval type lens system 4 and is changed in the exit direction to a desired direction by the optical path refracting mirror 5 disposed between the two lens systems 4a and 4b on the front side and rear side of the Petzval type lens system 4. The collimated beams of the light emitted form the Petzval type lens system 4 is projected to the telescope 6 of the low magnification (for example, 2-3 times). The incident information on the telescope 6 is enlarged to about 40 deg.-60 deg. angle of field and is emitted from the telescope 6. The information is reflected by the half mirror 8 to enter the visual field. The information is visually recognized at the wide angle of view of about >=40 deg..

Description

Detailed Description of the Invention A8 Objective of the Invention (1) Industrial Application Field The present invention reflects information displayed on the display surface of an information display means onto a half mirror tilted in front of the field of view of a helmet wearer. The present invention relates to a helmet-mounted display equipped with an optical system for guiding the eyes of a helmet wearer, and particularly to a helmet-mounted display having features in its optical system.

The helmet-mounted display is used when an operator of a vehicle such as an aircraft or a car is operating a vehicle while looking at the scenery in front of him, and when the operator is controlling the vehicle while looking at the scenery in front of him, various information is displayed overlaid on the scenery in front of him. be done.

This method of displaying information eliminates the need for the operator to take his/her eyes away from the outside world and look at the instrument panel. It has been actively researched and developed recently.

(2) Prior Art As illustrated in FIG. 2, the helmet mount display includes a half mirror 01 tilted in front of the helmet wearer's visual field, and a CR supported by the helmet 02.
Information display means 03 like T and this information display means 03
an optical system 04 for guiding the information displayed on the display screen to the eyes of the helmet wearer via the half mirror 01;
It is equipped with

The information display means 03 needs to be installed in a position close to the constituent members of the helmet 02 so as not to interfere with the operation of the helmet wearer. Further, the half mirror 01 needs to be placed in front of the helmet wearer. The optical system 04 for guiding the information from the information display means 03 to the eyes of the helmet wearer via the half mirror 01 needs to be configured and arranged so as not to interfere with the helmet wearer. .

In consideration of the above-mentioned necessity, the information display means 03 is often disposed on the upper surface or the lower part of the left and right sides of the helmet 02. In the example shown in FIG. 2, the information display means 03 and the One set of optical systems 04 is supported at the bottom of the left and right sides of the helmet 02, respectively.

(3) Problems to be Solved by the Invention By the way, when a helmet wearer visually confirms the information on the information display means 03 through the optical system 04 and the half mirror 01, the information can be seen at a wide viewing angle of about 40 degrees or more. ,convenient.

When designing such an optical system 04, the following (a)
, (b).

(a) As can be inferred from FIG. 2, in order to guide the information displayed on the display surface by the information display means 03 to the eyes of the helmet wearer via the half mirror Ol, the optical system 04 It is difficult to configure the optical axis of the optical system 04 in a straight line, and it is usually necessary to bend the optical axis of the optical system 04 one or more times.

(b) Due to the arrangement positions of the information display means 03 and the half mirror 01, the length of the optical system 04 should normally be about ten centimeters.

The present invention was made in view of the above-mentioned circumstances, and the present invention has been made in view of the above-mentioned circumstances.
It is an object of the present invention to provide a head-mounted display that satisfies conditions a) and (b) and is easily designed to allow a helmet wearer to view the information on the information display means at a viewing angle of about 40 degrees or more. purpose.

B1 Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the helmet mounted display of the present invention includes a half mirror tilted in front of the helmet wearer's visual field, and a half mirror that is supported by the helmet. and an optical system that projects information displayed on the display surface of the information display means onto the half mirror, the optical system being disposed close to the display surface. A Petzfal-type lens system that emits the information displayed on the display surface as a parallel light beam, and an optical path refractor placed between the front lens system and the rear lens system that make up this Petzfal-type lens system. It is characterized in that it is comprised of a mirror and a low magnification telescope disposed between the Petzphal type lens system and the half mirror.

(2) Effect In the helmet-mounted display of the present invention having the above-mentioned configuration, the information displayed on the display surface is emitted as a parallel light beam with a viewing angle of about 20 degrees through the Petzfal type lens system, and The output direction is changed to a desired direction by an optical path bending mirror disposed between both the front and rear lens systems of the Petzphal lens system.

The parallel light flux emitted from the Penzphal lens system is incident on the low magnification (for example, 2 to 3 times) telescope. The information incident on this telescope is then magnified to have a viewing angle of approximately 40'' to 60 degrees, emitted from the telescope, and then reflected by the half mirror and visually recognized by the helmet wearer. At this time, the helmet wearer visually recognizes the information in a state where it overlaps with the scenery of the outside world.

(3) Example Hereinafter, an example of the helmet mount display according to the present invention will be described with reference to the drawings.

In FIG. 1, inside a case 1 having an appropriate inner diameter and fixed to a helmet (not shown) in an appropriate mounting position, there is an appropriate information display means 2 such as a CRT at its base end.
is installed. An information display signal is input to the information display means 2 via a flexible connection cable 3, and necessary information is displayed on the display surface 2a of the information display means 2.

Further, within the case 1, a Petzfal type lens system 4 is disposed on the distal end side of the case 1, close to the information display means 2. This Petzfal type lens system 4 is
It is composed of a front lens system 4a and a rear lens system 4b, and is configured to emit the information displayed on the display surface 2a of the information display means 2 as a parallel light beam with a viewing angle of about 20 degrees. Further, an optical path bending mirror 5 for bending the optical axis is disposed between the front lens system 4a and the rear lens system 4b, so that the direction of the light beam can be adjusted.

Inside the case 1 is the Petzfal type lens system 4.
A telescope 6 with low magnification is disposed on the tip side of the case 1 in the vicinity of the telescope 6. The telescope 6 is composed of an afocal optical system, which expands the parallel light flux having a viewing angle of about 20° incident from the Petzphal lens system 4 to a viewing angle of about 40° to 60°, and converts it into a half mirror. The magnification is set to 2 to 3 in order to emit light toward the target.

The optical system 7 of this embodiment is composed of the components indicated by the numerals 4 to 6.

The output side end of the telescope 6 is disposed at the tip of the case 1, and a half mirror 8 is tilted forward at a position facing the tip of the case 1 and in front of the field of view of the helmet wearer. It is arranged in a posture. This half mirror 8
is a viewing angle of 40° to 60' emitted from the telescope 6.
The helmet is configured to reflect parallel light beams toward the helmet wearer and transmit external light from the front.

Next, the operation of the embodiment of the present invention having the above-described configuration will be explained.

The information displayed on the display surface 2a of the information display means 2 is as follows:
A parallel light beam with a viewing angle of about 20° is emitted from the Petzfal type lens system 4, and an optical path refraction mirror is disposed between both the front and rear lens systems 4a and 4b of the Petzfal type lens system 4. 5 allows the emission direction to be changed to a desired direction.

The parallel light flux emitted from the Petzphal type lens system 4 is incident on the telescope 6 having a low magnification (for example, 2 to 3 times). The information incident on the telescope 6 is magnified to have a viewing angle of approximately 40 to 60 degrees, and is emitted from the telescope 6, and is then reflected by the half mirror 8 and visible to the helmet wearer. At this time, the helmet wearer visually recognizes the information in a state where it overlaps with the scenery of the outside world.

Although the embodiments of the helmet-mounted display according to the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and can be modified in various ways without departing from the scope of the present invention described in the claims. It is possible to make design changes.

For example, instead of using a CRT as the information display means, it is possible to use information display means such as a light emitting diode display, an electroluminescent display, a transmissive liquid crystal display, etc. Instead of being disposed at the bottom of both left and right sides of the helmet, it is also possible to dispose it on the top surface of the helmet.

C9 Effects of the Invention According to the helmet mount display of the present invention described above, information is displayed on the display surface of the information display means within a distance of more than ten centimeters between the information display means and the half mirror in front of the helmet wearer. An optical system that allows a helmet wearer to view information at a viewing angle of about 40° to 60° can be easily manufactured.

In addition, as mentioned above, by configuring the optical system from a PAYRAF type lens system and a low-magnification telescope, aberration correction can be performed separately, making it easy to correct aberrations as a whole. .

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of a helmet-mounted display featuring an optical system according to the present invention, and FIG. 2 is an explanatory diagram of a helmet-mounted display to which the present invention is applied. 2... Information display means, 2a... Display surface, 4... Petzfal type lens system, 4a... Front lens system, 4
b... Rear lens system, 5... Optical path refraction mirror, 6.
...Telescope, 7.Optical system, 8.Half mirror.Patent Author: Ken Ochiai, Patent Attorney, Shimadzu Corporation

Claims (1)

[Claims] The helmet includes a half mirror tilted in front of the helmet wearer's field of vision, an information display means supported by the helmet, and an optical system that projects information displayed on the display surface of the information display means onto the half mirror. In the helmet-mounted display, the optical system includes a Petzfal-type lens system that is disposed close to the display surface and emits the information displayed on the display surface as a parallel light beam, and the Petzfal-type lens system. an optical path refracting mirror disposed between the front lens system and the rear lens system, and a low magnification telescope disposed between the Petzphal type lens system and the half mirror. Helmet mounted display.