公开(公告)号：JPH1152899A

公开(公告)日：1999-02-26

申请号：JP20347897

申请日：1997-07-29

Applicant: SONY CORP

Inventor： HATANAKA MASATO ,  TAGAWA YUSAKU ,  KATSURAGAWA HIDEKI

IPC: G02B5/30 ,  G02B19/00 ,  G02B27/28 ,  G02F1/13 ,  G09F19/16 ,  G09F19/18 ,  H04N5/74 ,  H04N9/31

Abstract: PROBLEM TO BE SOLVED: To reduce the cost and the size of the device by arranging the plate type polarized light separating mirrors, whose surfaces are set so that it is tilted to the optical axis of light beams, between picture displaying elements and a light source. SOLUTION: A PS converting unit 15 is used to take out only desired S wave, for example, from parallel light beams LP obtained from a reflection mirror 55 of a light source. When the beams LP are made incident on two polarized light separating mirrors 63, P wave pass the mirrors 63. However, S wave are reflected by the mirrors 63 and reach λ/4 plate mirrors 65. Then, the mirrors 65 reflect the S wave and send the S wave in parallel with an optical axis OP. On the other hand, the P wave passed the mirrors 63 are polarization converted to S wave by a λ/2 plate 67 and send out in parallel with the axis OP. Thus, only S wave are polarization separated from the beams LP and send to the first fly array lens side of a next stage.

公开(公告)号：JPH1164978A

公开(公告)日：1999-03-05

申请号：JP22358897

申请日：1997-08-20

Applicant: SONY CORP

Inventor： HATANAKA MASATO ,  TAGAWA YUSAKU ,  KATSURAGAWA HIDEKI

IPC: G03B33/12 ,  G02F1/13 ,  G03B21/28 ,  H04N5/74 ,  H04N9/31

Abstract: PROBLEM TO BE SOLVED: To provide a projection display device which can be reduced in size. SOLUTION: In the projection display device for projecting video displayed on a video display element 53 on a screen with the light of a light source 3, the light of the light source 3 is guided as illuminating light along a first optical axis OP1 through an optical element and returned by a first reflection mirror 47, to be reflected. Then, the illuminating light reflected by a second reflection mirror 48 is guided to the side of the video display element 53, along a second optical axis OP2 and the first and second optical axes OPI and OP2 are arranged in different positions and in parallel.

公开(公告)号：JPH06347899A

公开(公告)日：1994-12-22

申请号：JP14043193

申请日：1993-06-11

Applicant: SONY CORP

Inventor： HATANAKA MASATO ,  KOTAKE RYOTA ,  TAGAWA YUSAKU

IPC: G02F1/1335 ,  G02F1/13357 ,  G03B21/14 ,  G03B21/20

Abstract: PURPOSE:To correct the lowering of light quantity even when a devitrification phenomenon occurs. CONSTITUTION:By moving the positions of a reflector 3 or a metal halide lamp 2 on an optical axis, the reflection angle of light reflected by the reflector 3 is changed, and the light which does not pass through a condenser lens 4 because of devitrification also passes through the lens 4, so that condensed light quantity is increased. As a result, the condensed light quantity is not decreased so much even when the devitrification phenomenon caused by the increase of the use time of the lamp 2 occurs.

公开(公告)号：JPH1164972A

公开(公告)日：1999-03-05

申请号：JP22358997

申请日：1997-08-20

Applicant: SONY CORP

Inventor： HATANAKA MASATO ,  TAGAWA YUSAKU ,  KATSURAGAWA HIDEKI

IPC: G03B33/12 ,  G02F1/13 ,  G03B21/00 ,  H04N5/74 ,  H04N9/31

Abstract: PROBLEM TO BE SOLVED: To provide a projection display device capable of being miniaturized and clearly projecting a video. SOLUTION: In this projection display device for projecting the video displayed on a video display element 53 on a screen by using light of a light source 3, the light of the light source 3 is guided along a first optical axis OP1 through an optical element as illumination light, and is turned back by a first reflection mirror 47 and reflected, and the illumination light reflected by a second reflection mirror 48 is guided to the video display element 53 side along a second optical axis OP2, and the first optical axis OP1 and the second optical axis OP2 are arranged on different positions to be parallel to each other, and the optical element for uniformizing the intensity distribution of the illumination light is arranged on the first optical axis OP1, and the optical element is constituted so as to flatly arrange plural unit lenses, and a ratio d/D between the size (d) of the unit lens and the size D of the video display element 53 is set within the range of 1/16

公开(公告)号：JPH06265816A

公开(公告)日：1994-09-22

申请号：JP5212693

申请日：1993-03-12

Applicant: SONY CORP

Inventor： MURAKAMI KYOICHI ,  HORIUCHI HIROSHI ,  TAGAWA YUSAKU ,  HAMADA TAKESHI

IPC: G02B27/18 ,  G02F1/1335 ,  G02F1/13357 ,  G03B21/14

Abstract: PURPOSE:To obtain a light source preventing the decrease of an illumination efficiency while maintaining uniformity good by providing a light emitting hole and a condenser lens arranged in the vicinity of the hole and condensing a luminous flux emitted from the light emitting hole on the entrance pupil of a projection lens. CONSTITUTION:A condenser lens L1 is arranged in the vicinity of the light emitting hole 4 while being confronted with the light emitting hole 4. In this projector light source, a luminous flux emitted from a metal-haloid lamp 1 is reflected at a reflection plane 3 inside a spherical member 2 and emitted outside the spherical member 2 through the light emitting hole 4. Then, the luminous flux made to be a converged light by the condenser lens L1 passes through an image displaying plate 8 and condensed on the entrance pupil of a projection lens L2. In the projector light source, when the reflection plane 3 is made to be an uniform diffussion reflecting plane, the luminous flux emitted from the light emitting hole 4 maintains a good uniformity even in a case that the metal-haloid lamp 1 is not positioned in the center of the spherical member 2.

公开(公告)号：JPH0993598A

公开(公告)日：1997-04-04

申请号：JP26895695

申请日：1995-09-25

Applicant: SONY CORP

Inventor： NEGISHI FUMIAKI ,  HORIUCHI HIROSHI ,  TAGAWA YUSAKU ,  KATSURAGAWA HIDEKI

IPC: G02B5/00 ,  G03B21/00 ,  G09F9/00 ,  H04N9/31

Abstract: PROBLEM TO BE SOLVED: To reduce uneven color caused by a reflecting characteristic of a screen. SOLUTION: The projector is provided with optical modulation means 9, 17, 26 applying optical modulation to luminous flux of a light source 1 led by optical means 3, 4 for each of red, blue, green colors to generate an image signal, a polarization means 19 applying 1/2 polarization to a polarized component of the luminous flux of any color subject to optical modulation, an optical synthesis means 11 synthesizing the luminous flux of each color of optical modulation to form a color image and a screen on which a color image is projected, and a light shield means 12 limiting a prescribed optical path of the luminous flux polarized by the polarization means 19.

公开(公告)号：JPH0990510A

公开(公告)日：1997-04-04

申请号：JP26614995

申请日：1995-09-21

Applicant: SONY CORP

Inventor： NEGISHI FUMIAKI ,  HORIUCHI HIROSHI ,  TAGAWA YUSAKU ,  KATSURAGAWA HIDEKI

IPC: G03B21/14 ,  G09F9/00 ,  H04N5/74 ,  H04N9/31

Abstract: PROBLEM TO BE SOLVED: To make the shade on picture caused by the defect of cross dichroic prism inconspicuous. SOLUTION: A light source 4, a multilens array 1 where plural rectangular projecting lenses 1a and 1b are arranged in a zigzag grid shape, the multilens array 2 where plural projecting lenses 2a and 2b are arranged in the zigzag grid shape corresponding to the projecting lenses 1a and 1b, liquid crystal panels 9, 15 and 23 optically modulating the luminous flux of the light source 4 guided by the multilens arrays 1 and 2 for every red, blue and green and generating a picture signal, and the cross dichroic prism 11 synthesizing the luminous flux of each color optically modulated by respective liquid crystal panels 9, 15 and 23 and forming a color picture are provided.