JP2003048143A - Lens sucking tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens sucking tool which can separate a work lens from an adhesive surface without damaging any refracting interface, and reliably hold the work lens during cutting. SOLUTION: In the lens sucking tool comprising a fitting base part 11 fitted to a lens rotating shaft 4a of a lens grinding device 1 and an adhesive surface 12 which is integrated with the fitting base part 11, abutted on the refracting interface 2a of the work lens 2 and adhered to the refracting interface, the adhesive surface 12 comprises at least two kinds of surfaces of the adhesive force different from each other (a first adhesive surface 13 of weak adhesive force and a second adhesive surface 14 of adhesive force stronger than that of the first adhesive surface 13).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens suction jig which is attached to a grinding device for grinding a lens to be processed and holds the lens to be processed.

[0002]

2. Description of the Related Art Conventionally, there is known a lens grinding apparatus which grinds a peripheral edge of a circular unprocessed lens (textile lens) into a lens shape (lens shape) of eyeglasses. In this lens grinding apparatus, a lens to be processed is held between a pair of lens rotation shafts, and the lens to be processed is ground into a lens shape of eyeglasses with a grinding wheel while rotating the lens rotation shaft.

As a jig for holding the lens to be processed on the lens rotation shaft, a shaft-shaped mounting base for mounting on the lens rotation shaft and a rubber suction cup (suction plate) mounted on the shaft-shaped mounting base. There is known a lens suction jig including a. In order to hold the lens to be processed between the lens rotation axes using this lens suction jig, first the suction surface of the lens to be processed is sucked by the suction cup of the lens suction jig.
The shaft-shaped mounting base of this lens suction jig is fitted into the shaft mounting holes provided on the end faces of the pair of lens rotation shafts. Then, a lens holding member made of rubber provided on the other of the pair of lens rotation shafts is pressed against the lens to be processed, so that the lens to be processed is held (sandwiched) between the pair of lens rotation shafts.

However, when this lens suction jig is used, the lens to be processed is held only by the sandwiching force between the pair of lens rotation shafts, so that the lens to be processed (spectacle lens) may be damaged. there were.

Therefore, there has been considered a lens suction jig including a shaft-shaped mounting base for mounting on the lens rotation shaft, and a lens suction plate integrally provided on the shaft-shaped mounting base.
With this lens suction jig, a double-sided tape is adhered to the adhesive surface of the lens suction plate that contacts the refracting surface of the lens to be processed, and the adhesive force of this adhesive surface holds the lens to be processed between the lens rotation axes. ing.

[0006]

However, when the refracting surface and the adhering surface of the lens to be processed are fixed by the adhering force of the adhering surface, the adhering force is too strong to prevent the adhesive surface from peeling off from the refracting surface. It was Therefore, there is a case where the lens to be processed has to be forcibly peeled off from the adhesive surface by using a nail or a driver, and at that time, the refracting surface of the lens to be processed may be damaged.

Further, when a double-sided tape having a weak adhesive force is adhered to the adhesive surface so that the adhesive surface can be easily separated from the lens to be processed, the adhesive force for holding the lens to be processed is too weak and the lens to be processed is cut. The lens to be processed was likely to come off between the lens rotation axes during processing.

[0008] Therefore, the present invention provides a lens suction jig which can remove the lens to be processed from the adhesive surface without damaging the refracting surface of the lens to be processed and can surely hold the lens to be processed during cutting. Has an aim.

[0009]

In order to achieve the above object, the invention according to claim 1 provides an attachment base portion which is attached to a lens rotation shaft of a lens grinding apparatus, and is integrally provided on the attachment base portion. Further, in a lens suction jig having a bonding surface that is brought into contact with the refracting surface of the lens to be processed and adheres to the refracting surface, the bonding surface is composed of at least two types of surfaces having different adhesive forces. Is characterized by.

According to the first aspect of the present invention, the adhesive surface of the lens suction jig has at least two different adhesive forces.
Since it is composed of different types of surfaces, at least two types of adhesive surfaces having different adhesive forces can be bonded to the refracting surface of the lens to be processed. Therefore, the lens to be processed can be separated from the lens suction jig without damaging the refracting surface on the adhesive surface with weak adhesive force, and the lens to be processed can be surely removed during cutting with the adhesive surface with strong adhesive force. It can be held between rotating shafts.

According to a second aspect of the present invention, in the lens suction jig according to the first aspect, at least two kinds of bonding surfaces are evenly arranged on the circumference.

According to the invention of claim 2, in addition to the effect of claim 1, since at least two kinds of adhesive surfaces are evenly arranged on the circumference, respectively, a circle is formed on the refractive surface of the lens to be processed. The adhesive strength of the adhesive surface is adjusted uniformly in a ring shape, and it is possible to maintain an appropriate balance between the ease of peeling from the refractive surface and the adhesive strength to the refractive surface.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example in which the lens suction jig 10 of the present invention is attached to a lens grinding apparatus 1. The lens grinding processing apparatus 1 grinds a peripheral edge of a circular unprocessed lens (texture lens) 2 into a lens shape (eyeglass shape) of eyeglasses. However, since this lens grinding apparatus 1 has a well-known structure as described in the conventional example, detailed description of the entire lens grinding apparatus 1 will be omitted. Further, for convenience of explanation of the lens suction jig 10 of the present invention, first, the carriage 3 for holding the lens 2 to be processed and the lens rotation shaft 4a,
4b and the like will be described.

The lens grinding apparatus 1 includes a carriage 3
And a pair of lens rotation shafts 4a and 4b that are rotatably attached to the carriage 3 and sandwich the refracting surfaces 2a and 2b of the lens 2 to be processed from both sides, and a rotatable grindstone 5. A fitting hole 6a is formed at an end of one of the lens rotation shafts 4a and opens at an end surface of the lens rotation shaft 4a facing the lens rotation shaft 4b. Further, the lens suction jig 10 is fitted in the fitting hole 6a.
The lens rotation shaft 4b is also attached to the end of the other lens rotation shaft 4b.
Fitting hole 6 opened at the end face facing the lens rotation shaft 4a of
c is formed. A lens pressing jig 7 provided with a rubber lens pressing member 7a is fitted in the fitting hole 6c. Further, a protrusion 6b is formed at the bottom of the fitting hole 6a formed in the lens rotation shaft 4a.

Therefore, the front refracting surface 2a of the lens 2 to be processed is held by the lens suction jig 10, and the rear refracting surface 2b of the lens 2 to be processed is pressed by the lens pressing jig 7. In this way, the lens 2 to be processed is held (sandwiched) between the pair of lens rotation shafts 4a and 4b.

The pair of lens rotation shafts 4a and 4b are controlled to rotate around a predetermined angle by a driving means such as a pulse motor (not shown). This allows
Workpiece lens 2 held between lens rotation shafts 4a and 4b
Is controlled to rotate about the axis with a predetermined angle along with the rotation of the lens rotation shafts 4a and 4b. At this time, the carriage 3 moves up and down based on the target lens shape data,
The peripheral edge of the lens 2 to be processed is brought into contact with the rotating grindstone 5, and the peripheral edge of the lens 2 to be processed is ground into a target lens shape.

Next, the lens suction jig 1 according to the present invention.
0 will be described in detail.

As shown in FIG. 2, this lens suction jig 10 has a fitting hole 6 formed in one lens rotation shaft 4a.
It is provided with a mounting base 11 fitted to a and a lens suction plate 12 provided integrally with the mounting base 11.

The mounting base 11 is provided with a groove 11a into which the protrusion 6b formed at the bottom of the fitting hole 6a is inserted. By fitting the groove 11a and the protrusion 6b, the lens suction jig is rotated along with the rotation of the lens rotation shaft 4a.

Further, the lens suction plate 12 has an annular disc shape with an opening at the center. This lens suction board 1
2 is provided with an adhesive surface 12a to which the double-sided tape is adhered. The adhesive surface 12a is used to hold the lens 2 to be processed.

The adhesive surface 12a is weaker in adhesiveness to the refracting surface 2a of the lens 2 to be processed, and to the refracting surface 2a of the lens 2 to be processed than the first adhesive surface 13. The second adhesive surface 14 having a strong adhesive force. Here, the adhesive surface 12a is divided into eight equal parts along the circumferential direction, and the first adhesive surface 13 and the second adhesive surface 14 are alternately formed to make their areas even.

The first adhesive surface 13 is blasted (sanded) so as to weaken the adhesive force with respect to the refracting surface 2a of the lens 2 to be processed, and becomes a rough surface. As shown in FIG.
The entire surface of the double-sided adhesive tape adhered to the adhesive surface 13 does not strongly adhere to the first adhesive surface 13, and a gap is formed between the double-sided tape and the first adhesive surface 13.

The second adhesive surface 14 is not blasted so as to have a weaker adhesive force than the first adhesive surface 13 with respect to the refracting surface 2a of the lens 2 to be processed, and is left smooth.
The entire surface of the double-sided tape adhered to the adhesive surface 14 is the refraction surface 2a.
Is in close contact with.

In the above embodiment, the lens suction surface 12
The first itself is partially blasted in advance, and the double-sided tape is adhered to form the first adhesive surface 13 so that the unevenness is not crushed. However, after the double-sided tape is adhered, the surface of the double-sided tape is partially blasted. Then, the first adhesive surface 1 with weak adhesive force
3 and the second adhesive surface 14 having a strong adhesive force may be formed.

The size and shape of the first adhesive surface 13 and the second adhesive surface 14 are not limited to those in the above-described embodiment formed by equally dividing the adhesive surface 12a in the circumferential direction. For example, as shown in FIG. 4A, the first adhesive surface 13 and the second adhesive surface 14, which are circular, may be formed concentrically and alternately with the annular lens suction disk 12. Alternatively, as shown in FIG. 4B, the first adhesive surface 1 is formed in a spiral band shape from the vicinity of the central opening of the annular lens suction plate 12 toward the outer peripheral edge of the suction plate 12.
3 may be formed, and the second adhesive surface 14 may be formed in a spiral band shape along the first adhesive surface 13.

Further, as shown in FIG. 5 (a), the adhesive surface 12a may be partially formed by providing a gap or a step in the annular lens suction plate 12 according to the adhesive force of the double-sided tape. .

When a double-sided tape is adhered to the lens suction plate 12 with a gap, as shown in FIG. 5B, only the adhesive surface 12a is adhered to the refracting surface 2a of the lens 2 to be processed, and the double-sided tape is adhered. The surface 1 of the non-bonded lens suction surface 12
2b does not adhere to the lens 2 to be processed, and a slight gap is created.

When the lens suction plate 12 is provided with a step, as shown in FIG. 5C, the double-sided tape in the stepped portion does not adhere strongly to the lens 2 to be processed and the adhesive force is weakened. .

As described above, the adhesive surface 12a has a weak adhesive force to the refracting surface 2a of the lens 2 to be processed.
The following is an operation by providing the second adhesive surface 14 having a stronger adhesive force than the first adhesive surface 13.

In order to remove the lens 2 to be processed from the lens suction jig 10, first, a nail or the like is hooked on the first adhesive surface 13 of the lens suction plate 12 to separate the adhesive surface 12a from the refracting surface 2a of the lens 2 to be processed. To do. Here, since the first adhesive surface 12a has a weak adhesive force and can be easily separated from the refractive surface 2a, when the first adhesive surface 13 is separated from the refractive surface 2a of the lens 2 to be processed, the refractive surface 2a may be damaged. Absent.

As described above, when the first adhesive surface 13 is peeled off, the second adhesive surface 14 which is connected by the momentum of the peeling can be peeled off from the refracting surface 2a of the lens 2 to be processed. At this time, the second adhesive surface 14 has a stronger adhesive force to the refracting surface 2a of the lens 2 to be processed than the first adhesive 13, but since the first adhesive surface 13 has already been peeled off, a nail or a driver Even if it is not forcibly peeled off from the refracting surface 2a by the above or the like, it can be easily peeled off from the refracting surface 2a.

On the other hand, when the lens 2 to be processed is cut,
Since sufficient adhesive force acts between the second adhesive surface 14 and the refracting surface 2a of the lens to be processed, the lens 2 to be processed can be held without coming off.

[0034]

As described above, according to the first aspect of the invention, since the adhesive surface of the lens suction jig is composed of at least two types of surfaces having different adhesive forces, At least two types of adhesive surfaces having different adhesive strengths can be attached to the refracting surface of the lens. Therefore,
On the adhesive surface with weak adhesive force, the lens to be processed can be separated from the lens suction jig without damaging the refracting surface, and on the adhesive surface with strong adhesive force, the lens to be processed can be securely attached to the lens rotation axis during cutting. Can be held between.

Therefore, the lens to be processed can be separated from the lens suction jig without damaging the refracting surface at the end of the cutting process, and the lens to be processed can be reliably held between the lens rotation shafts during the cutting process.

According to the second aspect of the invention, in addition to the effect of the first aspect, it becomes easy to uniformly adjust the adhesive force of the adhesive surface, and the peeling from the refractive surface and the adhesive strength to the refractive surface are made easier. Balance and moderate can be maintained.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a main part of a lens grinding apparatus equipped with a lens suction jig of the present invention.

FIG. 2 is a perspective view of a lens suction jig according to the present invention.

FIG. 3 is an enlarged cross-sectional view of a main part of a lens suction jig according to the present invention.

FIG. 4 (a) is a front view showing a modified example of the bonding surface of the lens suction jig according to the present invention. (B) It is a front view showing the modification of the adhesion side of the lens adsorption jig concerning the present invention.

FIG. 5 (a) is a front view of the lens suction jig according to the present invention in which the bonding surface is partially formed. FIG. 6B is an enlarged cross-sectional view of an essential part when a gap is provided on the refracting surface to form an adhesive surface in FIG. FIG. 6C is an enlarged cross-sectional view of an essential part when a step is provided on the refracting surface to form an adhesive surface in FIG. 5A.

[Explanation of symbols]

1 Lens grinding machine 2 Processed lens 2a Refractive surface 4a Lens rotation axis 10 Lens suction jig 11 Mounting base 12 Lens suction surface 12a Adhesive surface 13 First adhesive surface 14 Second adhesive surface

Claims (2)

[Claims] 1. A mounting base which is mounted on a lens rotation shaft of a lens grinding apparatus, and an adhesive surface which is integrally provided on the mounting base and is brought into contact with a refracting surface of a lens to be processed and adhered to the refracting surface. A lens suction jig comprising: a lens suction jig, wherein the adhesive surface is composed of at least two types of surfaces having different adhesive forces. 2. The lens suction jig according to claim 1, wherein each of the at least two kinds of adhesive surfaces is evenly arranged on the circumference.