Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1996-08-08
1998-09-15
Epps, Georgia Y.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359631, 359633, G02B 2714
Patent
active
058088016
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a head mount display.
Further, the present invention relates to an optical system for observing an image obtained from an image information means and an outside image in a superimposed manner on a display such as a head mount type display or a glass type display.
BACKGROUND ART
The head mount display comprises a front housing 12 and rear housing 14 as shown in FIG. 1. When using the head mount display, the housings should be fixed to the head of an observer in such a manner that the front housing 12 is mounted in the vicinity of the eyes of the observer and the rear housing on the back of the head of the observer. An image display means is mounted in the front housing; the image information displayed on the image display means is observed by the observer in an enlarged manner. An image display/observe portion, which is represented by the numerical reference 16, is installed in the front housing 12 of the head mount display.
The image display/observe portion comprises an optical system, whose construction is depicted in FIG. 2 in an enlarged manner. In FIG. 2, the numerical reference 1 represents an image display means such as a liquid crystal display (hereinafter termed "LCD") or a cathode ray tube (hereinafter termed "CRT"), 2 a refractive type lens (so called "lupe"), 3 a semitransparent mirror which serves to combine light coming from at least two directions (hereinafter termed "combiner"), and the numerical reference 4 denotes the eyes of an observer. In such a construction of the image display/observe portion, light coming from an image displayed on the image display means 1 passes through the lens system 2 and is reflected by the combiner 3 to be directed to the eyes 4 of an observer so that image information is enlarged by the lens system 2 Ed then observed by the observer. On the other hand, light 10 coming from outside is made incident upon a front surface 15 of the front housing 12 and is transmitted through the combiner 3, so that the outside image is directly observed by the observer. That is to say, according to the conventional head mount display shown in FIG. 1, the outside image and the image on the image information means are superimposed together to be observed via the combiner.
Another optical system is known which is for use in the image display/observe portion of the head mount display. The construction is shown in FIG. 6. In FIG. 3, the numerical reference 1 represents an image information means such as an LCD or a CRT, 3 a combiner, and the numerical reference 5 also represents a combiner having a concave shape. In this conventional head mount display, light coming from an image obtained by the image information means is reflected by the combiner 3 to be directed to the concave-shaped combiner 5, which is disposed on the opposite side of the observer. The light is reflected by the combiner 5 and then directed to the observer via the combiner 3. Further light coming from outside is transmitted through the concave-shaped combiner 5 first and then through the combiner 3 to be introduced to the eyes 4 of the observer. In this manner, the image coming from the image information means and the image coming from the outside are superimposed and thus observed.
In the head mount display having the image display/observe portion as shown in FIG. 2, the image obtained on the image information means is enlarged by the lens system 2 and is then observed When observing the image which is enlarged by the lens system 2, aberrations should be corrected by the lens system 2 to obtain an optimum enlarged image. Therefore, because an optimum and highly magnified image is required, the lens system 2 should have a complex construction of optical parts using a plural number of lenses. Particularly, in the case where a colored image is observed, it is necessary to correct any chromatic aberration in the lens system well. In order to correct the chromatic aberration efficiently, many lenses including cemented lenses are necessary. Therefore, the size of the
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patent: 5546227 (1996-08-01), Yasugaki et al.
patent: 5625493 (1997-04-01), Matsumura et al.
Nakayama Shigeru
Tozaki Kenji
Enplas Corporation
Epps Georgia Y.
Mack Ricky
Sega Enterprises Ltd.
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