JPH0317530A - Lens meter for spectacle lens - Google Patents

Abstract

PURPOSE:To combine the centering and alignment of a lens organically and to enable execution of operations in a short time and without causing an error, by holding and fixing the machining center of a spectacle lens by a suction cup holder at the time of lens-polishing machining of the spectacle lens. CONSTITUTION:A suction cup holder 14 is supported axially by a slide shaft 13 so that it can slide and rotate. A suction cup 15 is fitted on the axis of rotation of a lens to be machined in a machining process by a lens-polishing machine. One part of a grip 16 for fitting the suction cup 15 to the lens to be inspected is fixed to the suction cup holder 14 and the other part thereof to a device on the opposite side of the lens 6 to be inspected. With the grip 16 grasped by an inspector, the suction cup 15 is moved onto the lens 6 side and fixed thereon by suction. In order to prevent an entire load applied to the lens 6 from being applied to a nose piece 7 on the occasion, a spring 17 contracts when the load more than a certain force is applied to the nose piece 7. Thereby the lens 6 to be inspected is brought into contact with a cushion 18, the load applied when the suction cup 15 is pressed on is accepted thereby, and thus deformation of the nose piece 7 is prevented.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a lens meter that measures the refractive properties of eyeglass lenses, and more specifically, the present invention relates to a lens meter that measures the refractive properties of eyeglass lenses. Use a lens meter with a striking function.

[Prior art 'f: I] The pre-process work of the rim process (grinding of the peripheral edge) of eyeglass lenses is generally performed according to the following procedure.

First, measure the power and axial angle of the unadded lenses using a lens meter for eyeglasses, match the axial angles, and place a mark at the optical center position.

Next, a molding machine is used to perform a template cutting operation that follows the lens frame shape of the eyeglass frame to obtain a template having the lens frame shape.

Then, align the unprocessed lens with the marked dots and the template with the lens frame shape of the eyeglass frame using the scale plate on the centering tool, and align the geometric center of the eyeglass frame with the optical center of the unprocessed lens. Perform eccentric positioning with the machine and attach the suction cup for machining to the unfinished lens (spindle work).

[Problems with the Prior Art and Issues to be Solved 1 As described above, according to the conventional method, each operation was performed separately and independently, which caused the following problems.

Namely, ■ Lens meters for eyeglasses as pre-process work equipment;
Each shaft driver was required, and each required installation space.

■Despite the progress in automation and speeding up of the beading machine itself, the work in the pre-process is still old-fashioned and largely depends on the experience and skill of the processor, and the errors caused by each work overlap, making it difficult to make nests in the pre-process. It has not been possible to improve the accuracy and, furthermore, the overall optical precision of a lens with a rough finish.

■It was not possible to speed up the pre-process work.

The purpose of the present invention is to organically combine the work of placing a mark on the optical center using an eyeglass lens meter and the work of placing a mark on an unprocessed lens using a centering tool, thereby reducing errors in a short period of time. The object of the present invention is to provide a device that does not cause such problems.

[Configuration of the Invention] In order to achieve the above object, a lens meter according to the present invention has the following configuration.

That is, a lens meter for measuring the refractive power of a spectacle lens is characterized in that it is provided with a pivoting means for a suction cup holder that grips and fixes the processing center of the spectacle lens during beading processing of the spectacle lens.

The processing center of the eyeglass lens gripped and fixed by the suction cup holder is the optical center of the eyeglass lens.

The spectacle lens rain lens meter of the first invention is characterized in that the nose piece for measuring refractive power is movable.

Further, the nose piece is characterized in that when it receives a force exceeding a predetermined pressure, it can be moved to a position where the pressure is avoided.

The clamping means of the suction cup holder according to the first aspect of the invention is characterized in that grips are placed opposite to each other with the lens to be examined interposed therebetween, and the clamping means is operated by gripping the grips.

The lens meter for eyeglass lenses according to the first invention is characterized in that a means for mounting a layout plate for eyeglasses is provided.

[Effects of the Invention] Since the present invention has the above-described structure, two pieces of equipment, a lens meter and a centering tool, are required in the pre-process work of conventional milling machine processing, and the work is performed separately. By integrating these into one device, the installation space in the store can be reduced, and by directly suctioning the suction cup instead of marking the eyeglass lenses, the work can be simplified, speeded up, and Errors in pre-process work can be reduced.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

This embodiment is a conventional lens meter for eyeglasses with a pivoting function, and is composed of a lens meter section and a pivoting section.

FIG. 1 is a cross-sectional view of the device.

Lensmeter Section The lensmeter section of this embodiment is a standard telescopic lensmeter. Since such devices are widely known,
Keep the explanation simple. It should be noted that the present invention can be easily implemented using lens meters other than this method, and it is not intended to exclude these from the scope of the rights.

1 is an eyepiece lens, 2 is a crosshair/angle scale, 3 is an objective lens, and 4 is a mark marker for marking marks. The dot marker 4 is shaped so as not to interfere with a suction cup holder 14, which will be described later.

5 G, t lens holder, 6 a lens to be tested, 7 a movable nosepiece. , 8 is a collimator lens, 9 is a target, 10 is a diffuser plate, 11 is a target rotating ring,
12 is a lamp that illuminates the target 9.

Place the lens 6 to be tested on the lens meter section in such a configuration with the lens holder 5 pushed up so that its center is approximately at the center of the movable nose piece 7, and then lower the lens holder 5. , holds the lens to be tested.

A target image, a crosshair, and an angle scale 2 are created by the eyepiece lens 1 and objective lens 3, which have the focus of the optical system at the illumination limit.
Observe. The target 9 is moved in the optical axis direction so that the target image illuminated by the lamp 12 by the collimator lens 8 and the test lens 6 becomes an infinite aerial image, that is, the target image can be clearly seen. The target image is located at the center of the crosshairs, and the diopter scale graduation (not shown) is read at a position where the target image is clearly visible.

In the case of an astigmatic lens, the target 9 is rotated by rotating the target rotation 1 nong, and the astigmatic power and the astigmatic axis are determined based on the imaging state of the target image.

The shaft striking portion 13 is a slide shaft, and a suction cup holder 14 is slidably and rotatably supported on the slide shaft 13. Reference numeral 15 denotes a suction cup, which is attached to the rotating shaft of the lens to be processed during the processing process using the beading machine.

16 is a grip for attaching the suction cup 15 to the lens to be examined; one side is the suction cup holder 14;
The other is fixed to the device on the opposite side of the lens to be examined.

When the suction cup 15 is installed, the suction cup holder 14 is in the position shown by the dashed line in FIG. 2, and after installation, it is rotated to the position shown by the solid line. There is a click (not shown) at the position where the center of the suction knob coincides with the optical axis, and the suction knob is fixed there.

When the examiner grasps the grip 16, the suction cup 15 is moved and pressed toward the lens to be examined and is fixed by suction.

At this time, in order to prevent the entire load applied to the test lens from being applied to the nosepiece 7, when a load exceeding a certain force is applied to the nosepiece 7, the spring 17 is compressed, and the test lens is brought into contact with the cushion 18. , receives the load when pressing the suction cup. Thereby, deformation of the nose piece 7 can be prevented.

The certain force mentioned here is a force that does not move the nose piece 7 when the apparatus is used to measure the refractive power of a lens to be tested.

With this configuration, when the optical center of the lens is found, the suction cup can be immediately placed there.

The above is an explanation of axis alignment when the tested lens is a spherical lens or an astigmatic lens.Next, unlike bifocal lenses or progressive multifocal lenses, the center of the layout is determined based on the appearance (markings, etc.) instead of determining the optical center. Let us explain how to find it.

First, the nose piece 7 is pushed in until it is placed, and the layout plate 19 is attached to the device. FIG. 4 is a front view of the layout plate 19.

Pins are used to position the product in the rotational direction to prevent rotational misalignment during installation. The center of the marking on the surface of the layout plate 19 naturally coincides with the center of the suction cup.

Furthermore, the eyepiece lens 1, the crosshair/angle scale 2, and the objective lens 3 are removed, a magnifying glass 20 is attached in their place, and the markings on the layout plate 19 and the markings on the lens or the position of the small beads are observed through the magnifying glass 20. Layout is done by Thereafter, shafting is performed using the method described above.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main parts of the device according to the embodiment of the present invention, FIG. The figure is a front view of the layout plate. 7...No-beam 13...Slide shaft 14...Suction cup honorada 15...
...Suction cup 16...Grip 1
7... Spring 18... Cushion 19... Layout plate 20... Magnifying glass

Claims (1)

[Scope of Claims] 1) A lens meter for measuring the refractive power of a spectacle lens, characterized by being provided with a pivoting means for a suction cup holder that grips and fixes the processing center of the spectacle lens during beading processing of the spectacle lens. A lens meter for eyeglass lenses. 2) The lens meter for eyeglass lenses according to claim 1, wherein the processing center of the eyeglass lens gripped and fixed by the suction cup holder is the optical center of the eyeglass lens. 3) The lensmeter for eyeglass lenses according to item 1, wherein the nose piece for measuring refractive power is movable. 4) A lens meter for eyeglass lenses, characterized in that the nose piece according to item 3 is movable to a position where pressure is avoided when a force exceeding a predetermined pressure is applied. 5) A lens meter for eyeglass lenses, characterized in that the pivoting means of the suction cup holder according to item 1 is characterized in that grips are placed opposite to each other with the lens to be tested interposed therebetween, and pivoting is performed by gripping the grips. 6) The lensmeter for eyeglass lenses according to item 1, further comprising a means for attaching a layout plate for eyeglasses.