Lens Meter Frame Support Cutout for Progressive Lens Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lens meters struggle to accurately measure the near vision zone of progressive lenses set in half-eye frames with narrow vertical widths, as the frame support member often interferes with the lens table, leading to unstable measurements and displacement of the cylinder axis angle and incorrect determination of the progressive zone length.
Innovation Solution
A lens meter with a frame support member featuring a cutout portion and a pad mechanism that allows the lens table to move backward, preventing interference and enabling stable contact with the frame rims, while a pad moving mechanism ensures the rim does not enter the cutout portion during measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the frame support member is moved forward to measure the near vision zone close to the lens edge, then the measurement position can be extended, but the frame support member contacts and interferes with the lens table, causing unstable measurements
Solution Approach 1:
The frame support member is divided into a contact surface portion and a cutout portion. The cutout portion creates a gap that allows the lens table to pass through without contacting the frame support member, thereby eliminating interference while maintaining measurement stability.
Solution Approach 2:
The lens table is extracted from the measurement area during forward movement of the frame support member. The cutout portion allows the lens table to be temporarily removed from the contact path, enabling the frame support member to move forward without interference.
2Ease of operation
If the frame is placed apart from the frame support member to avoid interference, then the frame can be moved freely, but the frame cannot be stably held causing displacement and measurement errors
Solution Approach 1:
The frame support member is segmented into a contact surface for stable holding and a cutout portion for interference-free movement. This segmentation allows the frame to be stably held during measurement while enabling forward movement without contact interference.
Solution Approach 2:
The cutout portion acts as an intermediary element that mediates between the frame support member and the lens table. It allows the lens table to pass through without direct contact, preventing interference while maintaining stable frame holding.
3Adaptability or versatility
If a hollow is provided in the frame support member to receive the lens table, then the lens table can be received, but the frame gets caught in the hollow when brought into contact, causing unstable holding
Solution Approach 1:
The frame support member is segmented into a contact surface and a cutout portion. The cutout portion is designed to allow the lens table to pass through without creating a hollow that could trap the frame, thereby maintaining holding stability while enabling lens table reception.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A lens meter for measuring optical characteristics of a spectacle lens, the lens meter comprises: a measurement optical system (10) including a light source (11), a measurement target plate (14), and a light receiving sensor (15); a lens table (4) to place a lens to be measured, the lens table having an opening (4a) through which a measurement optical axis of the measurement optical system passes; a frame support member (5) including a frame support plate (51) having a contact surface with which a left rim and a right rim of a spectacle frame will contact, the frame support plate being to be moved in a direction toward the lens table by a guide mechanism (55), this direction being referred to as a forward direction while an opposite direction is referred to as a backward direction. The frame support member includes: a cutout portion (54, S) provided in the frame support plate and configured to allow the lens table to come in backward than the contact surface of the frame support plate when the lens is placed on the lens table to measure a point close to an edge of the lens, the edge being located on the frame support plate side, while the rims of the spectacle frame are in contact with the frame support plate; a pad (61) with which the rim will contact to prevent the rim from coming in the cutout portion, the pad being provided in at least a part of the cutout portion; and a pad moving mechanism (62, 63, 64, 65, 67a, 67b, 68, 69) to move the pad so that a surface of the pad is moved in the backward direction from the contact surface.