EYEGLASS LENS MEASUREMENT APPARATUS

• US 20090064512A1
• Filed: 09/10/2008
• Published: 03/12/2009
• Est. Priority Date: 09/11/2007
• Status: Active Grant

• Current Assignee: Nidek Company Limited
• Original Assignee: Nidek Company Limited
• Inventors: Matsuyama, Yoshinori
• Granted Patent: US 7,631,431 B2
• Time in Patent Office: Days
• US Class Current: 33/28
• CPC Class Codes: G01B 5/0004 Supports G01B5/025 takes precedence
• CPC Class Codes: G01B 5/20 for measuring contours or curvatures

Abstract

An eyeglass lens measurement apparatus includes: a measurement unit which includes a tracing stylus to be inserted into a groove of a rim of an eyeglass frame, a moving mechanism for moving the tracing stylus along the groove of the rim, and a detector for detecting movement of the tracing stylus, and obtains three-dimensional shape of the rim based on a detected result by the detector; and a holding unit which includes upper and lower sliders for positioning the frame, left and right clamp pins for clamping the rim and left and right contact portion to be contacted with the rim which is clamped by the clamp pins, and holds the frame fixedly. The left and right clamp pins and the contact portions protrude from each of the upper and lower sliders. Each of the contact portions is formed at the periphery of each of the lamp pins.

Claims

1. An eyeglass lens measurement apparatus comprising:

a measurement unit which includes a tracing stylus to be inserted into a groove of a rim of an eyeglass frame, a moving mechanism for moving the tracing stylus along the groove of the rim, and a detector for detecting movement of the tracing stylus, and obtains three-dimensional shape of the rim based on a detected result by the detector; and

a holding unit which includes upper and lower sliders for positioning the frame, left and right clamp pins for clamping the rim and left and right contact portion to be contacted with the rim which is clamped by the clamp pins, and holds the frame fixedly,

wherein the left and right clamp pins and the contact portions protrude from each of the upper and lower sliders,

wherein each of the contact portions is formed at the periphery of each of the lamp pins.

2. The apparatus according to claim 1, wherein each of the contact portions is formed at an area within which each of the clamp pins is movable.

3. The apparatus according to claim 1, wherein each of the contact portions has a shape in which only a part thereof close to each of the clamp pins is in contact with the rim.

4. The apparatus according to claim 1, wherein each of the contact portions is formed at an outer side of each of the clamp pins.

5. The apparatus according to claim 1, wherein each of the contact portions is formed at outer and inner sides of each of the clamp pins, and the outer side contact portion protrudes further than the inner side contact portion.