Limited-area reflection type optical sensor and electronic device

摘要

There is provided a limited-area reflection type optical sensor having an emitted light lens and a reflected light lens. An opposite-light-receiver-side portion opposite to a light receiver side constitutes a first curvature surface having a first curvature while a light-receiver-side portion on the light receiver side with respect to the opposite-light-receiver-side portion constitutes a second curvature surface having a second curvature smaller than the first curvature in the emitted light lens provided in an optical path of the emitted light. An opposite-light-emitter-side portion opposite to a light emitter side constitutes a fourth curvature surface having a fourth curvature while a light-emitter-side portion on the light emitter side with respect to the opposite-light-emitter-side portion constitutes a fifth curvature surface having a fifth curvature smaller than the fourth curvature in the reflected light lens provided in an optical path of the reflected light.

主权项

1. A limited-area reflection type optical sensor configured to irradiate an object sensing limited area with emitted light from a light emitter and receive reflected light from an object existing in the object sensing limited area, the optical sensor comprising:
an emitted light lens or a reflected light lens; wherein the emitted light lens comprises: an opposite-light-receiver-side portion opposite to a light receiver side constituting a first curvature surface comprising a first curvature while a light-receiver-side portion on the light receiver side with respect to the opposite-light-receiver-side portion constitutes a second curvature surface comprising a second curvature smaller than the first curvature in the emitted light lens provided in an optical path of the emitted light; wherein the reflected light lens comprises: an opposite-light-emitter-side portion opposite to a light emitter side constituting a fourth curvature surface comprising a fourth curvature while a light-emitter-side portion on the light emitter side with respect to the opposite-light-emitter-side portion constitutes a fifth curvature surface comprising a fifth curvature smaller than the fourth curvature in the reflected light lens provided in an optical path of the reflected light wherein the light emitter comprises a light emitting element configured to emit the emit light, the light emitting element is arranged such that an optical axis of the emitted light emitted from the light emitting element is located on the opposite-light-receiver side with respect to a center axis of the emitted light lens, the light receiver comprises a light receiving element configured to receive the reflected light, and the light receiving element is arranged such that an optical axis of the reflected light in the light receiving element is located on the opposite-light-emitter side with respect to a center axis of the reflected light lens.