US 11,656,473 B2
Lightguide lighting system for display system
Kazumasa Takata, Osaka (JP); Masaru Fujita, Osaka (JP); Wahei Agemizu, Osaka (JP); Yosuke Araki, Osaka (JP); and Tomohisa Sakaguchi, Kyoto (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Apr. 20, 2021, as Appl. No. 17/235,088.
Claims priority of application No. JP2020-084813 (JP), filed on May 13, 2020.
Prior Publication US 2021/0356752 A1, Nov. 18, 2021
Int. Cl. G02B 6/00 (2006.01); G02B 27/09 (2006.01); B60K 37/02 (2006.01); G02B 27/01 (2006.01)
CPC G02B 27/0972 (2013.01) [B60K 37/02 (2013.01); G02B 27/0101 (2013.01); B60K 2370/1529 (2019.05); B60K 2370/347 (2019.05)] 15 Claims
OG exemplary drawing
 
1. An optical system comprising:
a light guide member having a light-incident surface, a first surface, a light-emitting surface facing the first surface, a first end surface, and a second end surface facing the first end surface;
a plurality of collimating lenses disposed on the light-incident surface and being arranged along a first direction, the first direction extending from the first end surface to the second end surface; and
a plurality of prism pieces provided on the first surface, the plurality of prism pieces being configured to reflect, toward the light-emitting surface, light passing through an inside of the light guide member, each of the prism pieces having a longitudinal axis,
wherein
the plurality of prism pieces include two or more prism pieces having different inclination angles with respect to the light-incident surface depending on positions of the prism pieces in at least the first direction, and each of the inclination angles of the two or more prism pieces is an angle formed between the first direction and the longitudinal axis of a corresponding prism piece,
each of the inclination angles of the two or more prism pieces increases as the corresponding prism piece is positioned closer to any of the first end surface or the second end surface,
the plurality of collimating lenses and the light guide member are integrally molded,
the plurality of prism pieces are disposed on a virtual arc on the first surface,
the plurality of prism pieces include a first set consisting of two prism pieces adjacent to each other on the virtual arc, and a second set consisting of two prism pieces positioned farther from a center of the first surface in the first direction than the first set and are adjacent to each other on the virtual arc, and
in the first set and the second set, the second set has a wider distance between adjacent prism pieces along the virtual arc.