Invention Grant
- Patent Title: Light-emitting device
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Application No.: US16331509Application Date: 2017-09-12
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Publication No.: US10551669B2Publication Date: 2020-02-04
- Inventor: Toshinobu Katsumata , Takuma Horiuchi
- Applicant: CITIZEN WATCH CO., LTD. , CITIZEN ELECTRONICS CO., LTD.
- Applicant Address: JP Nishitokyo-Shi, Tokyo JP Fujiyoshida-Shi, Yamanashi
- Assignee: CITIZEN WATCH CO., LTD.,CITIZEN ELECTRONICS CO., LTD.
- Current Assignee: CITIZEN WATCH CO., LTD.,CITIZEN ELECTRONICS CO., LTD.
- Current Assignee Address: JP Nishitokyo-Shi, Tokyo JP Fujiyoshida-Shi, Yamanashi
- Agency: Procopio, Cory, Hargreaves & Savitch LLP
- Priority: JP2016-177612 20160912
- International Application: PCT/JP2017/032900 WO 20170912
- International Announcement: WO2018/047975 WO 20180315
- Main IPC: G02F1/1335
- IPC: G02F1/1335

Abstract:
A light-emitting device comprises a first optical element covering an LED and covered by a second optical element. The first optical element has: a first incident surface on which light emitted from the LED is incident; a recessed first reflecting surface, above the first incident surface, and reflecting to the side the light is incident via the first incident surface from the LED; and a first emitting surface across the periphery of the first reflecting surface, which emits the light from the first reflecting surface. The second optical element has: an incident-reflecting surface formed by, concentric second incident surfaces on which light emitted from the first emitting surface is incident, and second reflecting surfaces alternately with the second incident surfaces, that reflect upward the light incident on the second incident surfaces; and a second emitting surface above the incident-reflecting surface, that emit light reflected by the second light reflecting surfaces.
Public/Granted literature
- US10585308B2 Light-emitting device Public/Granted day:2020-03-10
Information query
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