Title:
OPTICAL MEMBER, DISPLAY DEVICE, AND LIGHTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/198483
Kind Code:
A1
Abstract:
Provided is an optical member with which desired light distribution characteristic can be obtained, while having a simple configuration. The optical member widens along a first surface and has a thickness in a first direction orthogonal to the first surface, and has n inclined surfaces, first through n-th inclined surfaces, that are located in regions outside of regions mutually overlapping in the first direction and that are inclined so as to each form an angle Am of less than 90° relative to the first surface and each transmit incident light. The optical member satisfies the following conditional expression (1) and conditional expression (2). WA ≥ Am-Am-1 (1), An > An-1･･･ > Am > Am-1 > ･･･A2 > A1 (2), where: WA is an angle equivalent to no more than the half-value width of the light distribution of incident light; Am is the angle formed by the m-th inclined surface relative to the first surface; Am-1 is the angle formed by the m-1-th inclined surface relative to the first surface; and n is a natural number 2 or greater, and m is any natural number not greater than n.
Inventors:
FURUKAWA NORIMASA (JP)
NAKAKI KENICHI (JP)
NAKAKI KENICHI (JP)
Application Number:
PCT/JP2018/004796
Publication Date:
November 01, 2018
Filing Date:
February 13, 2018
Export Citation:
Assignee:
SONY CORP (JP)
International Classes:
G02B5/02; F21S2/00; F21V5/00; F21V5/02; G02F1/1335; F21Y115/10
Foreign References:
| JP2006032172A | 2006-02-02 | |||
| JP2007114587A | 2007-05-10 | |||
| JP2017088598A | 2017-05-25 |
Other References:
See also references of EP 3617755A4
Attorney, Agent or Firm:
TSUBASA PATENT PROFESSIONAL CORPORATION (JP)
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