公开(公告)号：GB2486000A

公开(公告)日：2012-06-06

申请号：GB201020284

申请日：2010-11-30

Applicant: ST MICROELECTRONICS RES & DEV ,  ST MICROELECTRONICS GRENOBLE 2

Inventor： FINDLAY EWAN ,  CAMPBELL COLIN ,  RAMSEY GEMMA ,  SAUGIER ERIC

IPC: H03K17/945 ,  H01L25/16 ,  H01L31/173

Abstract: Arrangements variously including baffles, grooves, slots, reflectors and blackening are provided to reduce unwanted internal light propagation from the emitter to the detector in a single-package optical proximity detector. For example, an opaque baffle 16 may be provided between the emitter 2 and detector 4, the baffle also serving as a locating feature to ensure alignment of the lens module 8 with the lens module mount 14. The baffle may have a curved surface (37, figure 7). Alternatively or additionally, one or more channels (figures 8-12) or V shaped grooves (figures 4-6 and 8-10) may be formed in the lens module 8 to reduce or further reduce unwanted light propagation from emitter to detector. A set of curved reflectors (102, figure 13) may be provided between the emitter and detector. The surface of the lens module may be selectively blackened to absorb unwanted radiation. The detector may be a SPAD and the proximity detector may be used in a mobile phone to disable the display and/or the phone controls when a user is deemed to be close and therefore making a call.