Abstract:
PROBLEM TO BE SOLVED: To provide a chamfering method and a chamfering device capable of eliminating the inaccurateness in chamfering caused by the unavoidable deformation of a normal spectacle lens, and the unavoidable inaccurateness of the software and the hardware of an effective grinding machine effectively relating to a supporting shaft. SOLUTION: In this method of improving the accuracy in the chamfering motion applied to the spectacle lens, compensating means 22, 22', 18, 18' having the elastic deformation absorbing capacity, are inserted between a peripheral part of a member composed of a chamfering tool 14 to be used or the spectacle lens 10 to be worked as one member, and a supporting shaft of the member as the other member.
Abstract:
PROBLEM TO BE SOLVED: To prevent position error generation between a lens optical axis and the line-of-sight axis of a human by positioning the centroid of a specified number of hinge-connected image formation units below a peal part axis. SOLUTION: In this image formation device 10, two of the image formation unit B1 and an observation unit B2 are integrally hinge-connected and provided in the form of a pendulum around the horizontal axis A3 of a peak part. The image formation unit B1 is provided with an image acquisition device 11 and restrains the direction of a corresponding image formation axis A1 and the observation unit B2 is provided with an observation screen 12 and restrains a corresponding optical axis A2. In such a constitution, the centroid of the image formation unit B1 is positioned below the axis A3 of the peak part of the device 10. They are housed in a casing 13. In such a manner, the deviation of the lens optical axis and the line-of-sight axis is the human is eliminated and visual quality is prevented from being damaged.
Abstract:
PROBLEM TO BE SOLVED: To obtain the clamping device which improves the machining speed, shape fidelity, size trackability, and characteristics regarding the axis of a lens by providing a coaxial clamping jaw part for clamping surfaces of a blank and allowing respective parts of the machine cooperate with one surface of the blank. SOLUTION: The clamping device includes the clamping jaw part 10 in which a plate 11 and a main body 12 are incorporated. The plate 11 has a bearing member 13 which is so applied as to cooperate a concave surface 2 of the blank 1 to be trimmed. As well as the clamping jaw part 10, another fixed jaw part which has its center aligned with the axis of the bank 1 cooperates with a projection convex surface of the blank 1. The main body 12 is hollow and a blank cylindrical housing 15 is incorporated, and by the housing 15, the clamping jaw part 10 is mounted on the tip 6 of a spindle 5 of a trimming machine. The plate 11 and main body 12 are bound so as to rotate together through the cooperation between a facet and the surfaces.
Abstract:
The invention relates to a method for trimming ophthalmic lenses in which an optical reference frame of the lens concerned and/or a trimming instruction is determined by means of a centration and/or trimming characteristic relating to the lens or to a related frame. According to the invention, the method comprises: a step in which a processing unit of a workshop (1) reads out from a remote register (200) in which each record is associated with a frame type and/or lens type, and comprises at least one centration and/or trimming characteristic of this type, with a search for a record corresponding to the type to which the frame and/or the lens concerned belongs, then, if no corresponding record is found in the register, a step of determining said at least one centration and/or trimming characteristic of the frame and/or of the lens in question, and a step of storing, in a new record of the register, said at least one centration and/or trimming characteristic.
Abstract:
The invention relates to a machine that comprises: a means for holding and rotatingly driving (12, 13) the lens (100) about a first rotation axis (A3), the rotation of the lens being controlled by a first control means (14); a tool carrier (20) mounted for rotation about a second rotation axis (A20), the rotation of the tool carrier (20) being controlled by a second control means; a plurality of working tools (21, 22, 23) mounted on the tool carrier (20) and capable of rotation about tool axes (A21, A22, A23), wherein at least two tools (21, 22) for shaping the periphery of the lens to be trimmed have different tool axes (A21, A22); a third control means for controlling the relative spacing mobility between the first rotation axis (A3) and the second rotation axis (A20); an inclination means (30, 31, 32) for the relative pivoting of the tool carrier (20) relative to the first rotation axis (A3) about a third rotation axis (AO) substantially transverse to the first rotation axis (A3).
Abstract:
The invention relates to a method for auto-calibrating a device for trimming ophthalmic lenses. The inventive method comprises the following steps which are performed after an ophthalmic lens (L1) has been trimmed using the trimming device, namely: a measurement is taken of the length (RHO) of at least one radius of the lens; the aforementioned length measurement is compared to the expected length (RHOo) of said radius; the result of the comparison is stored in a history containing the results of each comparison for lenses trimmed successively by the trimming device; and at least one set function is calculated for the subsequent trimming of another lens, said calculation taking account of the comparison results associated with several lenses in the history.
Abstract:
The invention relates to a machine that comprises: a means for holding and rotatingly driving (12, 13) the lens (100) about a first rotation axis (A3), the rotation of the lens being controlled by a first control means (14); a tool carrier (20) mounted for rotation about a second rotation axis (A20), the rotation of the tool carrier (20) being controlled by a second control means; a plurality of working tools (21, 22, 23) mounted on the tool carrier (20) and capable of rotation about tool axes (A21, A22, A23), wherein at least two tools (21, 22) for shaping the periphery of the lens to be trimmed have different tool axes (A21, A22); a third control means for controlling the relative spacing mobility between the first rotation axis (A3) and the second rotation axis (A20); an inclination means (30, 31, 32) for the relative pivoting of the tool carrier (20) relative to the first rotation axis (A3) about a third rotation axis (AO) substantially transverse to the first rotation axis (A3).
Abstract:
The device comprises pivoting means enabling the drilling axis (A6) of the drilling tool (35) to be pivoted (PIV) about the axis of orientation, and means for adjusting the angular position of the drilling tool (35) about said axis of orientation. It also comprises first mobility means enabling relative mobility of the drilling tool (35) in relation to the lens to be drilled (L), or vice-versa, according to a first degree of mobility (ESC) which is distinct from the pivoting (PIV) of the drilling axis (A6) of the drilling tool (35) about the axis of orientation, and in that said means for adjustment are configured in such a way as to control the pivoting (PIV) of the drilling axis (A6) of the drilling tool (35) about the axis of orientation, in favour of the first degree of relative mobility of the drilling tool (35) in relation to the lens (L) that is to be drilled.
Abstract:
The invention relates to an automatic pupilometer that comprises a light source (3) capable of generating a corneal reflection on at least one of the eyes of an individual each placed in front of a first and a second window (4), a collimation lens (6) for at least positioning the light source so as to correspond to the distance vision of the individual, a detection receptor (7) for automatically locating the reflection, and a calculator for calculating the pupil deviation of said individual. According to the invention, the pupilometer further includes a third window (12) in which the eye of an observer responsible for the measurement is to be placed in the vicinity of the focus of said lens (6) in order to display and check the measurement conditions.