US 10,649,200 B2Granted

Production method for binocular loupe

AssigneesShoichi Nakamura, Acp Japan Co., Ltd.

InventorShoichi Nakamura

Life of this patent

Estimating the term…

Loading patent…

Abstract

In a binocular loupe production method capable of attaching a loupe to a carrier lens at a correct downward attachment angle by measuring a forward tilting angle of a worker accurately, a square marker is attached to a frame having the carrier lens, and the face of a user wearing the frame and looking at a working operation point P located below while assuming a working posture taken when he or she uses the binocular loupe is photographed from the working operation point P. A forward tilting angle α of the carrier lens is calculated on the basis of the degree of change from the square shape to a trapezoidal shape of the marker in an oblique image of the face photographed from below, and a downward attachment angle r at which a loupe is attached to the carrier lens is determined according to the forward tilting angle α.

Claims33

Dependent claims

A binocular loupe production method that produces a binocular loupe by attaching a loupe to a carrier lens fitted to a frame while a user wears the binocular loupe, the method comprising:

(a) a step of attaching a square marker to the frame;
(b) a step of photographing, from a working operation point (P) located below, a face of a frame wearer who looks at the working operation point (P) while assuming a working posture taken when he or she is using the binocular loupe;
(c) a step of detecting a face photographed image from the photographed image, and a trapezoidal shape of the marker by converting the face photographed image into polylines and extracting, from objects each having four corners, an object in which an angle of each of the four corners is nearly 90°;
(d) a step of calculating a forward tilting angle (α) of the carrier lens according to a degree of change from a square shape to the trapezoidal shape of the marker detected in the step (c) and determining, based on the forward tilting angle (α), a downward attachment angle (r) based on which the loupe is attached to the carrier lens.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 15/598,989Filed 18 May 2017
Published: US 2018/0335617 A122 Nov 2018
Granted: 12 May 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G02B 23/125
With means for image conversion or intensification: head-mounted
G02B 25/004
Magnifying glasses: having binocular arrangement
G02C 7/088
Auxiliary lenses; Arrangements for varying focal length: lens systems mounted to spectacles
A61B 2090/3616
Image-producing devices, e.g. surgical cameras: magnifying glass