JP2523455Y2 - Lens suction jig - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a lens suction jig for sucking and holding the lens to be processed and mounting it on the ball mill in order to process the lens to be processed by the ball mill. It is about tools.

[Prior Art] As shown in FIG. 4, a conventional lens suction jig 1 includes a metal base 2 formed in a disk shape and a rubber cup-shaped suction portion formed in a trumpet shape. 3, and the base 2 and the suction part 3 are formed integrally.

Then, while the lens L to be processed is sucked by the suction unit 3, the base 2 is attached to one of a pair of lens rotating shafts of a ball-sliding machine (not shown), and the surface opposite to the suction surface of the lens L to be processed is By pressing at the end of the other lens rotation axis,
The lens L to be processed is held between the lens rotation axes. The lens L to be processed held between the lens rotation axes is
In order to frame the lens frame of the spectacle frame (not shown), the periphery is ground with a grinding wheel for the right eye or the left eye corresponding to the spectacle frame.

By the way, the lens L to be processed whose peripheral portion is ground
Is selected according to the required optical characteristics (S: spherical power, C: cylindrical power, A: cylindrical axis angle) based on a prescription based on the optometry data.

[Problem to be Solved by the Invention] However, since the optical characteristics of the lens L to be processed are measured by passing light through the optical center of the lens L to be processed, the lens suction jig 1 is attached to the surface of the lens L to be processed. There is a problem that the optical characteristics cannot be measured in the state of being adsorbed on the substrate.

In this regard, as an example in which a through hole is provided at the center of a lens suction jig, there is a suction block disclosed in Japanese Patent Application Laid-Open No. 53-120450. The suction block has a through hole in the center thereof through which the fiber for centering the lens to be processed is inserted, and an adhesive coating layer for bonding and fixing the lens to be processed is provided on the surface thereof.

However, after the peripheral edge of the lens to be processed is ground, when the suction block is removed from the lens to be processed, a part of the adhesive of the adhesive coating layer remains on the lens to be processed, so it is necessary to remove the adhesive. Yes, it was troublesome.

In the above publication, the adhesive is used to fix the mounting block to the lens to be processed. Therefore, after the mounting block is once attracted to the lens to be processed, the mounting block is attached to the lens to be processed. If the mounting block is once removed from the lens to be processed to change the mounting position, the adhesive force of the adhesive is lost, which is not preferable.

The present invention has been made in view of the above-mentioned problems, and its purpose is to measure the optical characteristics of a lens to be processed even when a lens suction jig is mounted on the lens to be processed, and to perform the measurement. An object of the present invention is to provide a lens attraction jig which does not require an adhesive for holding a processed lens and does not reduce the attraction force even if it is reattached many times.

Means for Solving the Problems According to the present invention, in order to achieve the above object, a columnar base for positioning and attaching to a lens rotation shaft of a rubbing machine and one end surface of the base are fixed. In a lens suction jig including an adsorbent, a through hole for measuring a refractive index is formed in the center of the base and the adsorbent, and a suction cup-shaped suction concave portion is positioned around the through hole to allow the adsorbent to pass through. It is characterized by having been provided.

[Operation] With the lens suction jig having the above configuration, the optical characteristics of the processed lens can be measured through the lens suction jig even after the lens to be processed is mounted on the lens suction jig. In addition, the lens to be processed is pressed and held on the adsorbent by the pressure difference between the inside of the suction concave and the atmosphere by pressing the adsorbent against the lens to be depressurized. Therefore,
If the position of attachment of the adsorbent to the lens to be processed is shifted, it can be re-adsorbed as many times as necessary, and even if the adsorbent is removed from the lens to be processed, an extra thing that needs to be removed from the lens to be processed remains. There is no such thing.

[Embodiment] Hereinafter, a lens suction jig according to the present invention will be described with reference to the drawings.

A ball mill (not shown) as a lens peripheral processing apparatus generally includes an apparatus main body, a carriage mounted on the apparatus main body so as to be vertically rotatable around a rear edge portion and to be movable left and right, and a free end of the carriage. The left and right protrusions provided on the portion, the pair of lens rotation shafts coaxially and rotatably held by the pair of protrusions, and the carriage in contact with a template or a circular portion provided on one of the lens rotation shafts. And a grinding wheel mounted on the apparatus body below the lens to be processed, which is held by the pair of lens rotating shafts. In addition, a mounting hole for mounting a lens suction jig is opened at one end of one of the opposite ends of the lens rotating shaft.

In this configuration, the lens to be processed is fitted between the pair of lens rotation axes by fitting the lens suction jig holding the lens to be processed into the mounting hole, so that the lens to be processed is held between the lens rotation axes. Is to be retained. Moreover, in this state, while rotating the grinding wheel at high speed and rotating the lens rotating shaft, the vertical movement of the carriage is adjusted by the elevating mechanism, whereby the peripheral edge of the lens to be processed held between the lens rotating shafts is adjusted. Is ground into a spectacle lens shape with a grinding wheel.

FIG. 1 and FIG. 2 show an embodiment of a lens suction jig attached to a lens rotation shaft of such a ball mill.
Two types are prepared for the left eye and the right eye. That is, the right eye lens suction jig shown in FIGS. 1 (a) and 2 (a).
10A and a left eye suction jig 10B shown in FIGS. 1 (b) and 2 (b) are prepared.

<Lens Attachment Jig for Left Eye 10A> The lens attraction jig 10A for the left eye is composed of a metal cylindrical base 20 and a rubber annular adsorber 30 integrally fixed to the cylindrical base 20. Having. The base 20 is fitted into the above-described mounting hole of the lens rotating shaft, and the suction body 30 is used to hold the lens L to be processed by suction.

Moreover, a circular concave portion 20a is provided in the cylindrical base portion 20, and a central hole 20c is formed in a bottom wall 20b forming the concave portion 20a. A center hole 30a is formed in the center of the adsorbent 30, and the recess 20a and the center holes 20c, 30a form a series of through holes 11. The through-hole 11 extends in a direction perpendicular to the suction surface of the lens suction jig 10A on the lens L to be processed. For this reason, as shown in FIGS. 2 (a) and 2 (b), a cylindrical base 20 is provided at the center of the lens suction jig 10A.
A space penetrating the inner surface of the outer surface adsorber 30 is formed, and even when the lens suction jig 10 is attached to the lens L to be processed, the optical characteristics of the lens L to be processed through the through hole 11 are formed. Can be measured.

Further, the cylindrical base 20 is provided with a vertical position hole 22 for judging the vertical direction, and a position deviation preventing groove 23 for preventing a deviation of the suction position. The vertical positioning groove 22 and the positional deviation preventing groove 23 are open at one end surface of the cylindrical base 20 at 20d.

Further, the adsorbent 30 has a cylindrical base, as is apparent from the drawing.
An annular thick base 30a fixed to the other end surface 20e of the 20, a thin part 30b provided on the outer peripheral side of the thick base 30a, and a thin part 30c provided on the inner peripheral side of the thick base 30b Have. Moreover, the space between the thin portions 30b and 30c is expanded toward the front end, and a suction concave portion 31 formed in a sucker shape is provided between the thin portions 30b and 30c.

Accordingly, by pressing the thin portions 30b, 30c of the adsorbent 30 against the lens L to be processed, the thin portions 30b, 30c are bent, and the air in the suction concave portion 31 is discharged to the outside. Since the thin portions 30b and 30c are in close contact with the lens L to be processed in an airtight manner, by removing the pressing force from the adsorbent 30, the thin portions 30b and 30c are removed.
When 30c tries to return to its original state with its own elastic force,
The pressure in the suction concave portion 31 decreases, and the lens L to be processed is suction-held by the suction concave portion due to the difference between the pressure in the suction concave portion 31 and the atmospheric pressure.

<Lens suction jig for right eye 10B> This lens suction jig for right eye 10B is a lens suction jig for left eye 10A only at the point where a metal cylindrical base 20 'is provided.
And different. That is, the cylindrical base 20 'is not provided with the above-described recess 20a, but is simply provided with a center hole 20f.
Thus, the center holes 20f and 30a form a series of through holes 11 '. This through hole 11 ′ has the same function as the through hole 11.

Next, an example of the operation of the lens suction jig having the above configuration will be described.

First, of the two processed lenses L1 and L2, one of the processed lenses L1 is attached to the lens suction jig 10A and the other of the processed lenses L2.
Then, the lens suction jig 10B is sucked, and the optical characteristics of the lenses L1 and L2 to be processed are measured by a lens meter (not shown).

According to this measurement, the processed lens for the right eye or the left eye based on the data of the prescription, for example, the lens suction jig 10A is suctioned to the processed lens L1 for the right eye, This means that the lens suction jig 10B is suctioned to the lens L2 to be processed. Therefore, the attached lens suction jig 10A,
By 10B, it is possible to easily and reliably identify whether the attracted lens to be processed is for the right eye or the left eye.

Further, in the above embodiment, the lens suction jig 10A or the lens suction jig 10B is identified based on the presence or absence of the concave portion 20a of the cylindrical base 20, but as shown in FIG. Two holes 24 are formed, and depending on the presence or absence of the holes 24, a right-eye lens suction jig 10C (see FIG. 3A) and a left-eye lens suction jig 10D (see FIG. 3B). May be identified. The number of holes 24 is not limited to two, but may be one, three or more, and a projection may be provided instead of the hole 24.

[Effects] As described above, the lens suction jig according to the present invention includes a cylindrical base for mounting the lens on the lens rotating shaft of the ball mill and a suction recess fixed to one end surface of the base. By providing an adsorbent provided, the adsorbent is pressed against the lens to be processed to depressurize the inside of the adsorption concave portion, whereby the lens to be processed is adsorbed and held on the adsorbent by a pressure difference between the inside of the adsorption concave portion and the atmosphere. In the lens suction jig configured as described above, a through hole for refractive index measurement that penetrates in a direction orthogonal to a suction surface that suctions the lens to be processed is formed in the center of the base and the shape suction body, Since the suction concave portion is provided around the through hole in the suction body, the optical characteristics of the lens to be processed can be measured even when the lens suction jig is mounted on the lens to be processed.

In addition, when the position of attachment of the suction body to the lens to be processed is shifted, suction can be performed again and again, and in this case, the suction force does not decrease.

Furthermore, since the adsorbent uses the principle of a suction disk utilizing reduced pressure, even if the adsorbent is removed from the lens to be processed, an extra material such as an adhesive that needs to be removed from the lens to be processed remains. Therefore, handling of the lens to be processed after removing the adsorbent is easy. Moreover, conventionally, when the adhesive is rubbed off with a cloth or the like, the coating layer such as the anti-reflection code on the surface of the lens to be processed may be damaged or peeled off, which is not desirable. However, in the present invention, no adhesive is required, so that the coating layer such as the anti-reflection coating on the surface of the lens to be processed is not damaged or peeled off unlike the conventional case.

Further, a pair of lens rotating shafts are formed in a cylindrical shape, and a lens peripheral processing device such as a ball-slider in which a measuring optical system for measuring the refractive index of the lens is disposed within the lens rotating shaft is provided. When the lens to be processed is mounted together with the lens suction jig, the refraction of the mounted lens can be measured through the through hole. It is also possible to judge whether or not the degree is right before processing.

In addition, since the base of the lens suction jig is formed in a cylindrical shape, even if a deformation force acts on the suction body due to the holding force between the lens rotation axes, this deformation force does not act on the base. In the case where the measurement optical system for measuring the refractive power as described above is provided on the lens rotation axis of the ball mill, the lens suction jig is mounted on the lens rotation axis even if the lens suction jig is mounted on the lens rotation axis. It is possible to reliably measure whether the lens to be processed has a target refractive index to be processed (as prescribed) or not immediately before processing. In this case, it is also possible to know beforehand whether the lens to be processed is a right lens or a left lens before processing, and it is possible to prevent the processing lens from being ground with wrong data. .

Furthermore, when the refractive index of the lens to be processed mounted on the lens rotation axis can be measured in the ball-sliding machine, the amount of prism of the lens to be processed can be determined by using the lens suction jig of the present invention. It is also possible to know the amount of deviation of the optical center of the lens to be processed from the rotation center of the lens rotation axis. By knowing the amount of deviation, it becomes possible to correct data for grinding before peripheral grinding of the lens to be processed.

[Brief description of the drawings]

1 (a) and 1 (b) are perspective views of a lens suction jig according to the present invention, FIGS. 2 (a) and 2 (b) are cross-sectional views taken along the line II-II of FIG. 1, and FIG. (A) and (b) are perspective views showing another embodiment, and FIG. 4 is a perspective view showing a conventional lens suction jig. 10A, 10B ... Lens suction jig 11,11 '... Through-hole L1, L2 ... Worked lens

Claims (1)

(57) [Scope of request for utility model registration] 1. A lens suction jig having a cylindrical base for positioning and attaching to a lens rotation axis of a ball-slider, and a suction body fixed to one end surface of the base. A through-hole is formed at the center of the base and the attraction body, and a suction cup-shaped attraction concave portion is provided around the at least one through-hole in the attraction body.