| 摘要 |
A device for measuring a characteristic reading distance of an individual, includes a measurement support carrying at least one ultrasound emitter member and at least one ultrasound receiver member, at least one of these members, referred to as a main measurement member, possessing a measurement axis on which emission or reception by the main measurement member is privileged, and being suitable for emitting or receiving ultrasound propagating in a measurement cone centered on its measurement axis. The device further includes an electronic processor unit adapted, as a function of the ultrasound signal received by the receiver member, to deliver a signal representative of the distance between the measurement support and an eyeglass frame worn by the individual's head, and to deduce therefrom the characteristic reading distance, and elements to verify that the eyeglass frame is situated at least in part in the measurement cone of the main measurement member. |
| 主权项 |
1. A device (500, 600) for measuring a characteristic reading distance of an individual, the device comprising:
a measurement support (510, 610) that includes a box (511, 611) carrying at least one ultrasound emitter member (520, 620) and at least one ultrasound receiver member (520, 620), at least one of these members, referred to as a main measurement member (520, 620) having a measurement element (522) in a cavity (521) in the box and possessing a measurement axis (AM5) on which emission or reception by the main measurement member (520, 620) has a maximum intensity, and being suitable for emitting or receiving ultrasound propagating in a measurement cone (CM5) centered on its measurement axis (AM5), an electronic processor unit adapted, as a function of the ultrasound signal received by the receiver member (520, 620), to deliver a signal that is representative of the distance (D) between the measurement support (510) and an eyeglass frame (30) worn by the individual's head (10), and to deduce therefrom said characteristic reading distance, means to verify that said eyeglass frame is situated at least in part in the measurement cone of said main measurement member, a reading medium (530) presenting a plane display portion suitable for displaying signs, and means (540) for releasably mounting the reading medium (530) on the measurement support (510, 610), wherein said measurement support (510, 610) forms a docking station for the reading medium (530), the docking station including both a base (511, 640) suitable for standing in stable manner on a plane, and releasable mechanical connection means (540) suitable for co-operating with complementary connection means of the reading medium. |
