EYEGLASS LENS PROCESSING APPARATUS AND EYEGLASS LENS PROCESSING PROGRAM

• US 20150004884A1
• Filed: 06/27/2014
• Published: 01/01/2015
• Est. Priority Date: 06/28/2013
• Status: Active Grant

• Current Assignee: Nidek Company Limited
• Original Assignee: Nidek Company Limited
• Inventors: OBAYASHI, Hirokatsu
• Granted Patent: US 10,377,011 B2
• Time in Patent Office: Days
• US Class Current: 451/256
• CPC Class Codes: B24B 9/148 electrically, e.g. numerically, controlled

Abstract

There is provided an eyeglass lens processing apparatus including a first rotational shaft which holds and rotates an eyeglass lens, a finishing tool, a chamfering tool which performs chamfering on an angular portion of an edge of the eyeglass lens, a second rotational shaft to which the chamfering tool is attached, an adjustment unit which adjusts a relative positional relationship between the first rotational shaft and the second rotational shaft, a chamfering angle setting portion which sets a chamfering angle formed between a rotational center axis of the first rotational shaft and a processing tool surface, an edge information acquisition portion which acquires information regarding an edge surface shape of the eyeglass lens, an angle correction portion which corrects the chamfering angle based on the information regarding the edge surface shape, and a control portion which controls the adjustment unit and performs chamfering based on the corrected chamfering angle.

Claims

1. An eyeglass lens processing apparatus comprising:

a first rotational shaft which is configured to hold and rotate an eyeglass lens;

a finishing tool which is configured to perform finishing on a rim of the eyeglass lens to have a target shape of the eyeglass lens;

a chamfering tool which is configured to perform chamfering on an angular portion of an edge of the eyeglass lens which is finished by the finishing tool;

a second rotational shaft, to which the chamfering tool is attached;

an adjustment unit which is configured to adjust a relative positional relationship between the first rotational shaft and the second rotational shaft;

a control portion which is configured to control driving of the adjustment unit;

a chamfering angle setting portion which is configured to set a chamfering angle which is an angle formed between a rotational center axis of the first rotational shaft and a processing tool surface of the chamfering tool when performing the chamfering;

an edge information acquisition portion which is configured to acquire information regarding an edge surface shape of the eyeglass lens; and

an angle correction portion which is configured to correct the chamfering angle which is set by the chamfering angle setting portion, based on the information regarding the edge surface shape which is acquired by the edge information acquisition portion,

wherein the control portion is configured to control the driving of the adjustment unit and adjust the relative positional relationship between the first rotational shaft and the second rotational shaft to perform the chamfering, based on the chamfering angle which is corrected by the angle correction portion.

2. The eyeglass lens processing apparatus according to claim 1,

wherein the edge information acquisition portion is configured to acquire information regarding a tilt angle of the edge surface with respect to the rotational center axis of the first rotational shaft, and

wherein the angle correction portion is configured to correct the chamfering angle which is set by the chamfering angle setting portion, based on the tilt angle of the edge surface which is acquired by the edge information acquisition portion.

3. The eyeglass lens processing apparatus according to claim 2,

wherein the finishing tool includes a bevel-finishing tool which is configured to form a bevel on the edge of the eyeglass lens, and

wherein the adjustment unit includes a bevel-finishing tool adjustment unit which is configured to adjust a relative positional relationship between the first rotational shaft and a third rotational shaft, to which the bevel-finishing tool is attached,

wherein the eyeglass lens processing apparatus further comprises:

a front surface curve acquisition portion which is configured to acquire curve information of a lens front surface; and

an edge surface tilt setting portion which is configured to set an edge tilt angle for beveling which is a tilt angle of the edge surface for performing bevel-finishing, for each vector angle based on the acquired curve information of the lens front surface and the target shape,

wherein the control portion is configured to control the bevel-finishing tool adjustment unit to perform beveling on the eyeglass lens, based on the target shape and the edge tilt angle for beveling which is set by the edge surface tilt setting portion, and

wherein the edge information acquisition portion is configured to acquire the edge tilt angle for beveling for each vector angle as the tilt angle of the edge surface at the chamfering.

4. The eyeglass lens processing apparatus according to claim 1,

wherein the edge information acquisition portion is configured to acquire information regarding a thickness of the edge surface, and

wherein the angle correction portion is configured to correct the chamfering angle which is set by the chamfering angle setting portion, based on the thickness of the edge surface which is acquired by the edge information acquisition portion.

5. The eyeglass lens processing apparatus according to claim 1,

wherein the edge information acquisition portion is configured to acquire a tilt angle of the edge surface for each vector angle of the target shape, and

wherein the angle correction portion is configured to correct the chamfering angle for each vector angle of the target shape, based on the tilt angle of the edge surface which is acquired for each vector angle.

6. The eyeglass lens processing apparatus according to claim 1, further comprising:

a determination unit which is configured to determine whether a bevel formed on the eyeglass lens is to come into contact with the chamfering tool.

7. The eyeglass lens processing apparatus according to claim 6,

wherein the determination unit is configured to perform comparison processing between at least a tapered angle of the chamfering tool and information regarding the bevel and determine whether the bevel is to come into contact with the chamfering tool, based on the compared result.

8. The eyeglass lens processing apparatus according to claim 6,

wherein the angle correction portion is configured to correct the chamfering angle when the determination unit determines that the bevel is to come into contact with the chamfering tool.

9. The eyeglass lens processing apparatus according to claim 6, further comprising:

a bevel angle acquisition portion which is configured to acquire an angle of a tilt surface of the bevel formed on the eyeglass lens with respect to the rotational center axis,

wherein the angle correction portion is configured to correct a relative angle of the second rotational shaft with respect to the rotational center axis so as to cause a relative angle of the processing tool surface of the chamfering tool with respect to the rotational center axis to be larger than the angle of the tile surface of the bevel when the determination unit determines that the bevel is to come into contact with the chamfering tool such that the chamfering tool is prevented from coming into contact with the bevel.

10. The eyeglass lens processing apparatus according to claim 6, further comprising:

a signal output portion which is configured to output a signal to notify an operator of a possibility that the chamfering tool is to come into contact with the bevel when the determination unit determines that the bevel is to come into contact with the chamfering tool.

11. The eyeglass lens processing apparatus according to claim 2,

wherein the edge information acquisition portion for acquiring the tilt angle of the edge surface of the eyeglass lens with respect to the rotational center axis is configured to acquire the tilt angle of the edge surface based on processing control data which is computed for processing the eyeglass lens.

12. A non-transitory storage medium having an eyeglass lens processing program stored thereon and readable by a processor of an eyeglass lens processing apparatus, the eyeglass lens processing program, when executed by the processor, causing the eyeglass lens processing apparatus to:

when performing chamfering on an angular portion of an edge of an eyeglass lens which is finished by a finishing tool, set a chamfering angle which is an angle formed between a rotational center axis of a first rotational shaft which is configured to hold and rotate the eyeglass lens and a processing tool surface of a chamfering tool which is configured to perform chamfering on the angular portion of the edge of the eyeglass lens;

acquire information regarding an edge surface shape of the eyeglass lens with respect to the first rotational shaft;

correct the chamfering angle based on the information regarding the edge surface shape which is acquired by the acquiring step; and

control driving of an adjustment unit which is configured to adjust a relative positional relationship between the first rotational shaft and a second rotational shaft to which the chamfering tool is attached so as to adjust the relative positional relationship between the first rotational shaft and the second rotational shaft based on the chamfering angle which is corrected by the correcting step.