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公开(公告)号：US10534231B2
公开(公告)日：2020-01-14
申请号：US16226325
申请日：2018-12-19
发明人： Yasuo Toko , Yoshifumi Takao
IPC分类号： G09G3/36 , G02F1/13 , F21S41/63 , G02F1/1345 , F21S41/663 , F21S41/657 , B60Q1/04 , B60Q1/14 , H05B37/02 , F21S41/64
摘要： A lighting device includes: a liquid crystal element having electrode pattern including a first portion and a second portion; drive circuit connected to the electrode pattern; polarizer disposed in front of the liquid crystal element and separated from the liquid crystal element in optical axis direction; analyzer disposed at rear of the liquid crystal element, and separated from the liquid crystal element in optical axis direction, wherein the polarizer and the analyzer constitute crossed Nicol polarizers; light source for supplying lights to the liquid crystal element within a predetermined incident angle range; and projection optical system projecting lights transmitted through the liquid crystal element forwardly; wherein the polarizer and the analyzer locally overlap with the liquid crystal element in projection normal to the liquid crystal element, and when the light source is turned on, the drive circuit supplies drive signal to the first portion of the electrode pattern which applies or releases voltages in compliance with circumstances, and supplies drive signal to the second portion of the electrode pattern which continuously applies voltage, lights transmitting through the first portion of the electrode pattern and projecting forward transmit both the polarizer and the analyzer, and lights transmitting through the second portion of the electrode pattern and projecting forward include components which do not transmit at least one of the polarizer and the analyzer.
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公开(公告)号：US20190187503A1
公开(公告)日：2019-06-20
申请号：US16226325
申请日：2018-12-19
发明人： Yasuo Toko , Yoshifumi Takao
IPC分类号： G02F1/1345 , G09G3/36 , B60Q1/04 , F21S41/63 , F21S41/657 , F21S41/663
摘要： A lighting device includes: a liquid crystal element having electrode pattern including a first portion and a second portion; drive circuit connected to the electrode pattern; polarizer disposed in front of the liquid crystal element and separated from the liquid crystal element in optical axis direction; analyzer disposed at rear of the liquid crystal element, and separated from the liquid crystal element in optical axis direction, wherein the polarizer and the analyzer constitute crossed Nicol polarizers; light source for supplying lights to the liquid crystal element within a predetermined incident angle range; and projection optical system projecting lights transmitted through the liquid crystal element forwardly; wherein the polarizer and the analyzer locally overlap with the liquid crystal element in projection normal to the liquid crystal element, and when the light source is turned on, the drive circuit supplies drive signal to the first portion of the electrode pattern which applies or releases voltages in compliance with circumstances, and supplies drive signal to the second portion of the electrode pattern which continuously applies voltage, lights transmitting through the first portion of the electrode pattern and projecting forward transmit both the polarizer and the analyzer, and lights transmitting through the second portion of the electrode pattern and projecting forward include components which do not transmit at least one of the polarizer and the analyzer.
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公开(公告)号：US20190078749A1
公开(公告)日：2019-03-14
申请号：US16125676
申请日：2018-09-08
发明人： Yasuo Toko , Ryotaro Owada , Yoshifumi Takao
CPC分类号： F21S41/645 , F21S41/285 , F21S41/30 , G02B27/283
摘要： An automotive headlight includes: a light source for emitting light; a polarization beam splitter for receiving a light flux from the light source, and dividing the light flux into a first polarization and a second polarization; a liquid crystal element disposed to receive the first polarization and the second polarization, divided by the polarization beam splitter; a phase shifter disposed on optical axis of one of the first polarization and the second polarization, and aligning polarization axis directions of the first polarization and the second polarization; and an output side polarizer disposed on output side of the liquid crystal element, wherein illumination regions corresponding to respective control electrodes in the liquid crystal element can be controlled to shield light.
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公开(公告)号：US10738958B2
公开(公告)日：2020-08-11
申请号：US16231350
申请日：2018-12-21
发明人： Yasuo Toko , Yoshifumi Takao , Takashi Sugiyama
IPC分类号： F21S41/64 , F21S41/135 , F21S41/25 , F21S41/141 , F21S41/176 , B60Q1/14 , H05B47/105 , F21Y115/10
摘要： A lighting device comprising: a light source for emitting lights along optic axis toward field of view; a liquid crystal element disposed on the optic axis, having electrode pattern in far field FF corresponding region and having no electrode pattern in near field corresponding region; a pair of polarizers including input side and output side polarizers sandwiching the liquid crystal element, constituting crossed Nicol polarizers; driver circuit for forming voltages applied to the electrode pattern; and phase shift forming element disposed between the pair of polarizers in the near field corresponding region of the liquid crystal element; wherein the far field corresponding region constitutes normally black optic system together with the pair of polarizers, and the near field corresponding region constitutes normally-on optic system together with the phase shift forming element and the pair of polarizers.
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公开(公告)号：US20190195457A1
公开(公告)日：2019-06-27
申请号：US16231350
申请日：2018-12-21
发明人： Yasuo Toko , Yoshifumi Takao , Takashi Sugiyama
IPC分类号： F21S41/64 , F21S41/135 , F21S41/25 , F21S41/141 , B60Q1/14 , F21S41/176
摘要： A lighting device comprising: a light source for emitting lights along optic axis toward field of view; a liquid crystal element disposed on the optic axis, having electrode pattern in far field FF corresponding region and having no electrode pattern in near field corresponding region; a pair of polarizers including input side and output side polarizers sandwiching the liquid crystal element, constituting crossed Nicol polarizers; driver circuit for forming voltages applied to the electrode pattern; and phase shift forming element disposed between the pair of polarizers in the near field corresponding region of the liquid crystal element; wherein the far field corresponding region constitutes normally black optic system together with the pair of polarizers, and the near field corresponding region constitutes normally-on optic system together with the phase shift forming element and the pair of polarizers.
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公开(公告)号：US10914444B2
公开(公告)日：2021-02-09
申请号：US16604945
申请日：2018-04-19
发明人： Yasuo Toko , Yoshifumi Takao , Masafumi Ohno , Yoshihisa Iwamoto
摘要： To increase the light utilization efficiency when selective light irradiation is performed using a liquid crystal element (a liquid crystal device). A lamp unit including: a light source; a reflective polarizing plate disposed at a position where light from the light source is incident; a reflecting mirror configured to reflect a reflected light generated by the reflective polarizing plate and re-enters the reflected light to the reflective polarizing plate; a liquid crystal device disposed on the light emitting surface side of the reflective polarizing plate; a polarizing plate disposed on the light emitting surface side of the liquid crystal device; and a lens disposed on the light emitting surface side of the polarizing plate.
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公开(公告)号：US20200217472A1
公开(公告)日：2020-07-09
申请号：US16604945
申请日：2018-04-19
发明人： Yasuo Toko , Yoshifumi Takao , Masafumi Ohno , Yoshihisa Iwamoto
摘要： To increase the light utilization efficiency when selective light irradiation is performed using a liquid crystal element (a liquid crystal device). A lamp unit including: (a) a light source; (b) a reflective polarizing plate disposed at a position where light from the light source is incident; (c) a reflecting mirror configured to reflect a reflected light generated by the reflective polarizing plate and re-enters the reflected light to the reflective polarizing plate; (d) a liquid crystal device disposed on the light emitting surface side of the reflective polarizing plate; (e) a polarizing plate disposed on the light emitting surface side of the liquid crystal device; and (f) a lens disposed on the light emitting surface side of the polarizing plate.
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公开(公告)号：US10571090B2
公开(公告)日：2020-02-25
申请号：US16125676
申请日：2018-09-08
发明人： Yasuo Toko , Ryotaro Owada , Yoshifumi Takao
摘要： An automotive headlight includes: a light source for emitting light; a polarization beam splitter for receiving a light flux from the light source, and dividing the light flux into a first polarization and a second polarization; a liquid crystal element disposed to receive the first polarization and the second polarization, divided by the polarization beam splitter; a phase shifter disposed on optical axis of one of the first polarization and the second polarization, and aligning polarization axis directions of the first polarization and the second polarization; and an output side polarizer disposed on output side of the liquid crystal element, wherein illumination regions corresponding to respective control electrodes in the liquid crystal element can be controlled to shield light.
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公开(公告)号：US10551018B2
公开(公告)日：2020-02-04
申请号：US16411159
申请日：2019-05-14
发明人： Yasuo Toko , Ryotaro Owada , Yoshifumi Takao
IPC分类号： F21S41/135 , F21S41/32 , F21S41/255 , F21S41/64
摘要： To reduce the optical members and the complexity of optical design. A vehicular lamp including: a light source; a light collecting member; a first polarizer advancing in a first direction a first component of the light, and advancing in a second direction a second component; a liquid crystal element disposed on one side of the first polarizer in the first direction; a second polarizer disposed on one side of the liquid crystal element in the first direction; a projection lens disposed on one side of the second polarizer in the first direction and projecting the first component to the front of an own vehicle; a reflecting member for reflecting the second component; where the first component is focused at a first focal point, the second component of the light is focused at a second focal point, and the liquid crystal element is disposed corresponding to the first focal point.
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