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11. 发明专利

JPH05100187A LIQUID CRYSTAL PROJECTOR 失效
公开(公告)号：JPH05100187A
公开(公告)日：1993-04-23
申请号：JP25746091
申请日：1991-10-04
申请人： HITACHI LTD
发明人： OISHI SATORU , MORI SHIGERU , JITSUKATA HIROSHI , KONUMA YOSHIHIRO , FUKUDA KYOHEI
IPC分类号： G02B27/18 , G02F1/13 , G03B33/12 , H04N9/30
摘要： PURPOSE:To eliminate the astigmatisms on a screen and to enhance the resolution of a screen by providing a cylindrical lens which generates the aberrations to negate the astigmatism into an optical path in order to correct the astigmatism generated by dichroic mirrors. CONSTITUTION:The light rays past liquid crystals 9, 10, 11 are made incident on a light synthesizing means 15 where the red, green and blue light rays are synthesized by the dichroic mirrors 16, 17 crossed in X shaped. The synthesized light is made incident on a projecting lens 18 via the cylindrical lens 19 for correcting the astigmatisms and arrives at the screen. The images on the liquid crystal panels are thus macro-projected on the screen. The astigmatisms generated by the light synthesizing means 15 are proportional to the thicknesses of the dichroic mirrors through which the light passes and, therefore, the astigmatism quantities vary with the red, blue and green. However, the images having the high resolution having no problems in practicable use are obtd. by disposing the cylindrical lens 19 of the specifications corresponding to the green which exerts the highest influence on the resolution among the color light rays of the red, blue and green.

12. 发明专利

JPH0389236A REAR PROJECTION TYPE STEREOSCOPIC VIDEO DEVICE 失效
公开(公告)号：JPH0389236A
公开(公告)日：1991-04-15
申请号：JP22438589
申请日：1989-09-01
申请人： HITACHI LTD
发明人： YOSHII MASAKI , AMANO YASUO , FUKUDA KYOHEI , KONUMA YOSHIHIRO
IPC分类号： G03B35/24 , G02B30/25 , H04N13/04
摘要： PURPOSE:To obtain a stereoscopic video device excellent in a stereoscopic effect by setting the phase difference of light caused by the double refraction of an optical device including a screen which is interposed between projected light and the projection surface of the screen within a specified range. CONSTITUTION:In the screen 1, the projected light from two projection devices 21 and 22 is condensed by a Fresnel lens 5 and the condensed light is properly diffused by a lenticular sheet 4. As to a stereoscopic image, an image for a right eye and an image for a left eye is formed by using two kinds of light which can be discriminated from each other, such as right-handed circularly- polarized light and left-handed circularly-polarized light or two linearly polarized light beams which are orthogonally crossed with each other, and both of them are viewed through polarizing spectacles 3. The phase difference delta of the light caused by the double refraction of the optical device including the screen 1 which is interposed between the projected light and th4e projection surface of the screen 1 is set a value within a radian which is expressed by a formula I. Provided that N means an integer including zero in the formula I. Thus, the device which obtains the stereoscopic video that has high contrast ratio and is excellent in stereoscopic effect is obtained.

13. 发明专利

JP2005031706A PROJECTION DISPLAY APPARATUS 审中-公开
公开(公告)号：JP2005031706A
公开(公告)日：2005-02-03
申请号：JP2004302368
申请日：2004-10-18
申请人： HITACHI LTD
发明人： KONUMA YOSHIHIRO , MATSUDA YUTAKA , DEGUCHI MASAHARU , INAGE HISAO , TSUNODA TAKASHI
IPC分类号： G02F1/13 , G03B21/00 , G03B21/16
摘要： PROBLEM TO BE SOLVED: To prevent the fluctuation of a projected image by exhaust wind and to improve cooling efficiency. SOLUTION: The projection display apparatus is arranged with an exhaust fan by tilting the fan with an optical axis of a projection lens and is constituted with a wind-directing plate so as to make the tilt angle of the wind-directing plate on the side nearer the projection lens greater than the tile angle of the one on the side further from the projection lens. COPYRIGHT: (C)2005,JPO&NCIPI

14. 发明专利

JPH11258691A PROJECTOR 失效
公开(公告)号：JPH11258691A
公开(公告)日：1999-09-24
申请号：JP5828898
申请日：1998-03-10
申请人： HITACHI LTD
发明人： KONUMA YOSHIHIRO , IKOMA JUNICHI
IPC分类号： H04N5/74 , G03B21/00
摘要： PROBLEM TO BE SOLVED: To excellently enlarge and project an image on a screen without reference to the installation position of a projector body. SOLUTION: The projector body 1 lights up a liquid crystal display panel 4 from behind by a light source 3 and an image displayed on the liquid crystal display panel 4 is enlarged and projected on the screen 7 through a zoom lens 6. This zoom lens 6 can be moved by a lens moving mechanism 5 obliquely up and down to the display surface of the liquid crystal panel 4 and the zoom lens 6 thus moves to vary the projection direction of the image and the size of the projected image. Further, the size of the projected image on the screen 7 can be varied by varying the zoom power of the zoom lens 6. Thus, the display image of desired size can be enlarged and projected on the screen 7 by a projector 1 of an arbitrary position by adjusting the lens moving mechanism 5 and zoom power.

15. 发明专利

JPH10186546A LIQUID CRYSTAL PROJECTOR 失效
公开(公告)号：JPH10186546A
公开(公告)日：1998-07-14
申请号：JP27841997
申请日：1997-10-13
申请人： HITACHI LTD
发明人： KONUMA YOSHIHIRO , MATSUDA YUTAKA , DEGUCHI MASAHARU , INAGE HISAO , TSUNODA TAKASHI
IPC分类号： G03B33/12 , G02F1/13 , G03B21/16 , H04N5/74 , H04N9/31
摘要： PROBLEM TO BE SOLVED: To prevent hot blast from adversely influencing the periphery and to display a picture without fluctuation by arranging a ventilating fan proximately to a projection lens so that the fan may be inclined to the optical axis direction of the projection lens. SOLUTION: In order to prevent heat generated from a light source from exerting an influence on component parts other than the light source, the ventilating fan for cooling the light source 38 is arranged near a metal halide lamp 1 being the light source and lamp reflectors 3 and 5 so as to discharge the hot blast 39 to the outside of the housing of the liquid crystal projector. The fan 38 is arranged adjacently to the projection lens 37 to be inclined so that exhaust air 39 from the fan 38 may go away from the projected light 36 from the lens 37. The inclination angle of the fan 38 is set to b=15 deg. with reference to the angle a=30 deg. of the projection light 36a of the projected light 36 on the exhaust air 39 side so as to prevent a situation that the hot blast 39 exhausted from the fan 38 flows into the projected light 36 from the lens 37 and the projected picture to a screen is fluctuated.

16. 发明专利

JPH10104762A POSITIONAL ADJUSTMENT MECHANISM FOR PRISM AND ITS METHOD 失效
公开(公告)号：JPH10104762A
公开(公告)日：1998-04-24
申请号：JP25698996
申请日：1996-09-27
申请人： HITACHI LTD
发明人： NISHIJIMA TATSUMI , KONUMA YOSHIHIRO , NAGAI KIYUUICHIROU
IPC分类号： G03B33/12
摘要： PROBLEM TO BE SOLVED: To make a movable prism transferable in a state of press-contact of this prism with a fixed prism and to enable positional adjustment of the movable prism with high accuracy. SOLUTION: The prism 2 of a prism part 20 is brought into press-contact with the reference surface of the fixed prism 1 by means of a spring, and when a screw 49a is turned, this screw 49a side of the prism part 20 is transferred to an arrow mark (b) side, for example, and is tilted with respect to a reference side plate 40. During this transfer, the prism 2 is brought into press-contact with the reference surface of the prism 1. Next, when a screw 49b is turned, this screw 49b side of the prism part 20 is transferred to this arrow mark (b) side so as to eliminate the inclination of this prism part 20. By operating the screws 49a, 49b in this manner, the prism 2 is transferable to a described position by being transferred in a zig-zag way while the prism is press-contact with the reference surface of the prism 1.

17. 发明专利

JPH09243990A PROJECTION TYPE LIQUID CRYSTAL DISPLAY DEVICE 失效
公开(公告)号：JPH09243990A
公开(公告)日：1997-09-19
申请号：JP5578196
申请日：1996-03-13
申请人： HITACHI LTD
发明人： ADACHI MASAYA , KONUMA YOSHIHIRO , SATO KENJI , MATSUDA YUTAKA
IPC分类号： G02F1/13 , G02F1/133
摘要： PROBLEM TO BE SOLVED: To obtain high-grade videos which have decreased unequal luminosity and colors, is light and has a good contrast by specifying the position of a lens plate which is arranged in the position near a condenser lens among the lens plates consisting of plural unit lenses. SOLUTION: The second lens plate 301 is arranged in the position where nearly the same optical distance as the optical distance of an aperture-stop 105 viewed from the liquid crystal panel on nearly the same plane as the plane of this aperture-stop 105 is attained. The size of the lens aperture of this second lens plate 301 is set smaller than the size of the aperture-stop 105 of the projecting lens. The second lens plate 301 is arranged in the position where nearly the same optical distance as the optical distance of the aperture-stop 105 is attained and, further, the size of the lens aperture is set larger than the effective diaphragm surface of the projecting lens and, therefore, the condensing position of the light made incident on the liquid crystal panel via the second lens plate 301 and reflected is within the effective diaphragm surface 601 of the projecting lens. The efficient incidence of this light on the projecting lens is made possible. The light reflected by the liquid crystal panel is thus efficiently utilized for projection without increasing the size of the projecting lens.

18. 发明专利

JPH09105898A OPTICAL ELEMENT AND PROJECTION TYPE LIQUID CRYSTAL DISPLAY DEVICE EQUIPPED WITH ELEMENT 失效
公开(公告)号：JPH09105898A
公开(公告)日：1997-04-22
申请号：JP26270495
申请日：1995-10-11
申请人： HITACHI LTD
发明人： ADACHI MASAYA , KONUMA YOSHIHIRO , SATO KENJI , TSUMURA MAKOTO
IPC分类号： G02B5/00 , G02F1/13 , G02F1/1335 , G02F1/13357
摘要： PROBLEM TO BE SOLVED: To provide an optical element which can provide uniform and lighter illumination by improving the utilization efficiency of light and peripheral light intensity rate without spoiling the parallelism of the light. SOLUTION: The optical element which receives incident luminous flux from a light source and projects the luminous flux on an object surface to be irradiated is equipped with a 1st total reflecting surface 6 and a 2nd total reflecting surface 7 in the same shape and a luminous flux splitting surface 4 which splits the incident luminous flux 11 into reflected light 13 and transmitted light 12; and the 1st and 2nd total reflecting surfaces 6 and 7 and luminous flux splitting surface 4 are parallel to each other and the 1st and 2nd total reflecting surfaces arranged opposite each other across the luminous flux splitting surface. The 1st and 2nd total reflecting surfaces 6 and 7, and luminous flux splitting surface 4 are set at an angle of 45 deg. to the optical axis of the incident luminous flux; and the 1st and 2nd total reflecting surfaces and luminous flux splitting surface form their shadows on other surfaces to the incident luminous flux which is made incident almost in parallel and none of the incident luminous flux leaks from between the respective surfaces.

19. 发明专利

JPH07261087A VIDEO DISPLAY DEVICE 失效
公开(公告)号：JPH07261087A
公开(公告)日：1995-10-13
申请号：JP5545694
申请日：1994-03-25
申请人： HITACHI LTD
发明人： TANIDE HIDEO , MURANAKA MASAYUKI , KOJIMA SUSUMU , KONUMA YOSHIHIRO , KISHIMOTO SEIJI
IPC分类号： G02B17/00 , G02B27/02 , G03B21/28 , G09F9/00
摘要： PURPOSE:To provide a video display device giving capable of perspective feeling so that a viewer feels a peripheral video as a short-range view and a center-part video as a distant view to the viewer. CONSTITUTION:A transmission screen 2A is provided with curvature and the projecting surface side thereof is opposed to a concave mirror 1. Besides, the radius of the curvature (y) thereof is larger than or equal to the radius of the curvature (x) of the mirror 1(x

20. 发明专利

JPH07218910A LIQUID CRYSTAL PROJECTOR 失效
公开(公告)号：JPH07218910A
公开(公告)日：1995-08-18
申请号：JP1237594
申请日：1994-02-04
申请人： HITACHI LTD
发明人： JITSUKATA HIROSHI , KONUMA YOSHIHIRO , KOJIMA SUSUMU
IPC分类号： G02F1/13 , G02B27/18 , G02F1/1335 , G02F1/13357 , H04N5/74
摘要： PURPOSE:To provide a high-contrast image without generating the shadow of a lamp on a screen by providing a first lamp reflector and a spare reflector out of an optical axis and providing a second reflector on the optical axis. CONSTITUTION:The liquid crystal projector is composed of a lamp 1, first lamp reflector 2 combining rotationally symmetric paraboloids equipped with different focal distances, spare reflector 9 out of the optical axis, and second reflector 8 arranged on the optical axis. In light flux 6 from the lamp 1, the light flux reflected by the paraboloid reflector nearer to the optical axis is turned to light flux 61 almost parallel to the optical axis and lights up the image display plane of a liquid crystal panel. In this case, the light flux near the optical axis is shielded by a glass tube sealing the electrode of the lamp 1, and the light flux is reduced in comparison with the other part. On the other hand, the light flux away from the optical axis is reflected by the reflector and turned to the light flux directed toward the spare reflector 9. Then, the light flux reflected by the spare reflector 9 is reflected in the direction of the second reflector 9 and turned to the light flux to be converged on the optical axis.

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