JPH0756143Y2 - Plastic lens marking device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel plastic lens marking device. Specifically, regarding a plastic lens marking device for marking the manufacturer's name or the type of lens on a plastic lens used for spectacles, etc., a laser beam is used to accurately irradiate the laser beam on the planned marking position on the lens surface. It is intended to provide a novel plastic lens marking device that can be used.

[0002]

2. Description of the Related Art A plastic lens used for spectacles or the like is provided with a marking for identifying the manufacturer's name or the type of lens.

Such engraving has been manually performed by an operator for each lens by an engraving jig having a diamond tip with an extremely fine tip.

[0004]

Therefore, the work of marking the lens is inferior in workability, and the marking process takes the longest time in the manufacturing process of the plastic lens.

It is also conceivable to carry out such marking work with a laser beam.

However, the plastic lens used for spectacles has a curved surface,
Because the curvature of the lens surface differs for each lens and the lens thickness at the marking position differs for each lens, the laser beam can be accurately applied to the planned marking position on the lens surface, and the accuracy of the lens surface can be improved. Since it is difficult to irradiate vertically well, it has been impossible to achieve marking with a laser beam on a plastic lens.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the plastic lens marking device of the present invention has an irradiation hole formed in a reference table, the irradiation hole of which the axis is orthogonal to the reference plane, The center of the inner surface of the plastic lens is pressed from below by the roller member of the pressing member and pressed against the reference surface of the reference table, and from this state, the lens pressing member is approximately in the direction in which the irradiation hole is formed along the reference surface. The marking position of the plastic lens is moved in parallel to the irradiation hole, and a laser beam is irradiated through the irradiation hole to mark the marking position of the plastic lens.

[0008]

Therefore, according to the plastic lens marking device of the present invention, if the distance between the predetermined position (reference point) on the reference surface and the irradiation hole is defined, the distance from the center of the plastic lens to the planned marking position is increased. The distance can be defined with high accuracy, and therefore the laser beam can be applied to the planned marking position with high accuracy.

Further, since the plastic lens is pressed against the peripheral edge of the irradiation hole on the reference plane side, the normal line of the irradiation hole corresponds to the normal line of the irradiation hole. Therefore, the laser beam that is coincident with the axis and passes through the axis of the irradiation hole can be accurately applied to the lens surface at a right angle.

From the above, it is possible to perform the marking work of the plastic lens by the laser beam, and therefore the workability can be improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The plastic lens marking device of the present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings.

The embodiment shown in the drawings is an application of the present invention to a plastic lens marking device for marking a plastic lens of spectacles.

Further, the plastic lens stamped by the plastic lens marking device in this embodiment is in a state before being processed into a shape corresponding to the frame of the spectacles, and its front shape is circular. There is.

Reference numeral 1 in the drawing is a marking device, which comprises a reference table 2, a laser beam oscillator 3, a lens table 4, a lens pressing member 5, and the like.

The reference table 2 is used to accurately position the engraved plastic lens 6 with respect to the laser beam L, and its lower surface is a smooth reference surface 2a.

An irradiation hole 7 having an axis 7a orthogonal to the reference surface 2a is formed at a position separated from the reference surface 2a at a predetermined position (hereinafter referred to as "reference point") O by a predetermined distance. There is.

The irradiation hole 7 has a circular cross section, and therefore the axis 7a passes through the center of the circle.

Reference numeral 8 is a friction sheet adhered to the reference surface 2a, the surface of which has a high friction coefficient and is made of a relatively hard material such as hard urethane. This is for preventing stumbling between the plastic lens 6 and the reference surface when the lens pressing member is moved after being pressed against the reference surface 2a.

Further, a small hole 8a having the same size as the irradiation hole 7 is formed in a portion of the elastic sheet 8 corresponding to the irradiation hole 7.

The laser beam oscillator 3 irradiates a laser beam L for marking on the plastic lens 6, and the laser beam L to be irradiated is the reference table 2 described above.
Is arranged above the reference table 2 so as to be orthogonal to the reference plane 2a and to coincide with the axis 7a of the irradiation hole 7.

The lens base 4 is for mounting the plastic lens 6 and transferring it to a predetermined position. The lens base 4 is located below the reference base 2 and its upper surface is substantially parallel to the reference surface 2a. As seen, it has a long rectangle in the direction connecting the reference point O of the reference surface 2a and the axis 7a of the irradiation hole 7.

The lens base 4 is arranged so that its approximate center as viewed from above coincides with the reference point O of the reference surface 2a. And a lowered position spaced downward from the raised position.

The raised position of the lens base 4 is a position where the upper end surface of the plastic lens 6 is lightly contacted with or slightly separated from the reference surface 2a when the plastic lens 6 is placed thereon. .

Reference numeral 9 denotes a U-shaped notch which is opened at a substantially central portion of a shorter side edge of the lens base 4 on the side corresponding to the irradiation hole 7. The U-shaped notch 9 extends in the longitudinal direction. The rear end portion is formed so as to be located on the side opposite to the opening side with respect to the center of the lens base 4, and therefore, when viewed from above, the reference point O of the reference surface 2a is formed.
The irradiation hole 7 is formed so as to be located in the U-shaped notch 9.

The lens pressing member 5 is for pressing the plastic lens 6 against the reference surface 2a of the reference table 2 and is rotatably supported by the two arms 10 and 10 and the tips of the arms 10 and 10. Roller member 11 and the like.

The arm 10 has a substantially horizontal L-shape when viewed from the side, and is substantially horizontal and extends long arm 10a extending in the longitudinal direction of the lens base 4 and extends upward from one end of the long arm 10a. The two arms 10 and 10 are arranged parallel to each other so that their L-shaped side surfaces face each other when viewed from above and the roller member 11 is provided. Is rotatably supported between the upper ends of the short arms 10b and 10b of the arms 10 and 10 with its axis extending horizontally and in the short direction of the lens base 4.

The roller member 11 is made of a hard rubber material, and its roller surface 11a is formed in a rounded shape so that the central portion thereof projects outward.

The width of the lens pressing member 5 supporting the roller member 11 by the two arms 10 and 10 is smaller than the width of the U-shaped notch 9 of the lens base 4, and the U-shaped notch 9 is relatively formed. It is designed so that it can be passed vertically.

The lens pressing member 5 is provided with elastic contact means (not shown) so as to elastically contact the roller member 11 when the roller member 11 contacts the plastic lens 6.

The lens pressing member 5 is moved to a standby position (see FIG. 2) below the U-shaped notch 9 when viewed from above and below the raised position of the lens base 4 by a moving means (not shown), and the standby position. Move horizontally from the position and see from above U
The upper end point of the roller member 11 located in the character notch 9 is the reference surface 2
The pre-press position that matches the reference point O of a when viewed from above (see FIG. 3).
Reference) and the first vertically moved upward from the pre-pressing position.
Lens pressing position (see FIG. 4) and the second lens pressing position in which the upper end point of the roller member 11 is moved horizontally from the first lens pressing position to coincide with the axis 7a of the irradiation hole 7 of the reference table 2. It is adapted to be moved to and from the position (see FIG. 5).

Numeral 12 is a lens alignment tool for aligning the plastic lens 6 at a predetermined position on the lens base 4, and two blocks whose opposing surfaces are flat V-shaped when viewed from above. 13 and 13.

The blocks 13, 13 are arranged so that the line connecting the valleys of the opposing V-shaped surfaces 13a, 13a is parallel to the lateral direction of the lens base 4 and passes through the center of the lens base 4 when viewed from above. In the state where the lens base 4 is in the lowered position, it is moved by a moving means (not shown) so that the V-shaped surfaces 13a and 13a of the lens base 4 are moved to a position slightly above the upper surface of the lens base 4 and along the same. .

The plastic lens 6 is then engraved by the engraving device 1 for the plastic lens in the following manner.

First, the lens base 4 is located at the lowered position, and the lens pressing member 5 is located at the standby position.

In this state, the plastic lens 6 is carried by the carrying means (not shown) and placed on the lens base 4 (see FIG. 2).

When the plastic lens 6 is placed on the lens base 4, the lens alignment tool 12 is actuated and the blocks 13 and 13 thereof are moved toward each other, and V
The plastic lens 6 is sandwiched between the character faces 13a and 13a.

In this state, the plastic lens 6
The center of the lens is the center of the lens base 4 and the reference surface 2a when viewed from above.
Is coincident with the reference point O.

Plastic lens 6 on lens base 4
When the alignment is performed, the lens alignment tool 12 is moved to a position where the V-shaped surfaces 13a and 13a are separated from each other and the lens base 4 and the blocks 13 and 13 do not overlap each other when viewed from above.

When the plastic lens 6 is placed at a predetermined position on the lens base 4, the lens base 4 is raised and the plastic lens 6 is lightly contacted from below with the elastic sheet 8 attached to the reference surface 2a of the reference base 2. At that time, the raising operation of the lens base 4 is stopped.

Elastic sheet 8 of this plastic lens 6
Contact with the center of the outer surface of the plastic lens 6 and the portion of the elastic sheet corresponding to the reference point O of the reference surface 2a.

The lens pressing member 5 is moved to the pre-pressing position at the same time as the raising operation of the lens base 4 or after a slight delay (see FIG. 3).

In this state, the upper end point of the roller surface 11a of the roller member 11 is aligned with the center of the lens base 4 and the reference point O of the reference surface 2a when viewed from above.

Next, when the roller member 11 is lifted and moved to the first pressing position, the upper end point of the roller surface 11a comes into contact with the center position of the plastic lens 6 from the inner side surface side thereof, The elastic sheet 8 attached to the reference table 2 is pressed.

At this time, the roller surface 11 of the roller member 11
Since a is elastically contacted with the inner surface of the plastic lens 6 and the roller surface 11a is formed to have a rounded shape, it is substantially point-contacted with the inner surface of the plastic lens 6.

The plastic lens 6 is the lens pressing member 5
The lens base 4 is lowered by being pressed against the reference base 2 via the elastic sheet 8 by the above, and the state in which the plastic lens 6 is pressed against the reference base 2 only by the lens pressing member 5 is held (see FIG. 4).

When the lens pressing member 5 is moved to the second pressing position from this state, the roller member 11 rolls while elastically contacting the inner surface of the plastic lens 6, and the plastic lens 6 also rolls. Since the pressing position by moves, it inclines accordingly.

At this time, the outer surface of the plastic lens 6 is brought into contact with the reference base 2 via the elastic sheet 8, and the inner surface of the plastic lens 6 is elastically contacted with the roller member 11 made of hard rubber. No stumbling occurs between them, so the reference point O of the reference surface 2a and the irradiation hole 7
By pre-matching the distance between the center of the plastic lens 6 and the outer surface distance between the center of the plastic lens 6 and the planned engraving position, the positional relationship between the two does not occur.

Although the thickness of the plastic lens 6 is not always constant, a large pressing force is applied to the plastic lens 6 due to the elastic contact of the roller member 11, or conversely,
The pressing force does not decrease and the plastic lens 6 does not separate from the reference base 2.

When the roller member 11 moves to the second pressing position, the outer surface of the plastic lens 6 is pressed against the lower surface side peripheral edge of the irradiation hole 7 of the reference base 2 through the peripheral edge of the small hole 8a of the elastic sheet 8. The axis 7a of the irradiation hole 7 is normal to the portion of the outer surface of the plastic lens 6 located in the irradiation hole 7.

Next, irradiation of the laser beam L by the laser beam oscillator 3 is performed on the plastic lens to mark the planned marking position.

At this time, the portion of the outer surface of the plastic lens 6 located in the irradiation hole 7 is the axis 7a of the irradiation hole 7.
The laser beam L is applied to the planned engraving position of the plastic lens 6 at an accurate angle.

[0052]

As is apparent from the above description, the plastic lens marking device of the present invention has the lower surface formed on the smooth reference surface and the irradiation hole whose axis is perpendicular to the reference surface. And the laser beam oscillator arranged above the reference table so that the laser beam passes through the axis of the irradiation hole, and below the reference table and away from the reference surface of the reference table. A lens base disposed so as to be freely contactable, and a lens pressing member in which a roller member is attached to the pressing portion, and the plastic lens mounted on the lens base is pressed from below by the roller member to press the reference surface of the reference base. the equipped, in a state pressed against the plastic lens on the reference surface, characterized in that the so that substantially moved parallel to the reference plane of the lens pressing member in a direction irradiation holes along the reference plane is formed.

Therefore, according to the plastic lens marking device of the present invention, if the distance between the predetermined position (reference point) on the reference surface and the irradiation hole is defined, the distance from the center of the plastic lens to the planned marking position is increased. The distance can be defined with high accuracy, and therefore the laser beam can be applied to the planned marking position with high accuracy.

Further, since the plastic lens is pressed against the peripheral edge of the irradiation hole on the reference plane side, the normal line to the irradiation hole corresponds to the normal line of the irradiation hole. Therefore, the laser beam that is coincident with the axis and passes through the axis of the irradiation hole can be accurately applied to the lens surface at a right angle.

From the above, it is possible to carry out the marking work of the plastic lens by the laser beam, and therefore the workability can be improved.

In the above-mentioned embodiment, the irradiation hole is circular, but the irradiation hole is not limited to this and may be a triangle, a quadrangle, other polygons or an ellipse.

Further, the irradiation hole is elongated in the moving direction along the reference surface of the roller member, and the lens pressing member can be moved along the reference surface from a position corresponding to the reference point of the roller member. The laser oscillator is provided so as to be moved in synchronism with the roller member so that the laser oscillator is always located above the upper end point of the roller member, so that an arbitrary position on the lens surface is marked. be able to.

Furthermore, the specific shapes and structures shown in the above embodiments are merely examples for implementing the marking device for plastic lenses of the present invention,
The technical scope of the present invention should not be limitedly interpreted by these.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing an example of an embodiment of a marking device for a plastic lens according to the present invention.

FIG. 2 is a view showing a state in which a plastic lens is placed on a lens base and a lens pressing member is in a standby position, II- in FIG.
It is sectional drawing which follows the II line.

FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1, showing a state in which the lens base is in the raised position and the lens pressing member is in the pre-pressing position.

4 is a IV of FIG. 1 showing a state in which a plastic lens is pressed by a lens pressing member so as to come into contact with a reference surface.
It is a sectional view taken along the line IV.

FIG. 5: The lens pressing member is moved to the second pressing position,
It is sectional drawing which follows the VV line of FIG. 1 which shows the state which made the marking position of the plastic lens locate in the irradiation hole of a reference stand.

[Explanation of symbols]

 1 Plastic Lens Marking Device 2 Reference Stand 2a Reference Surface 3 Laser Beam Oscillator 4 Lens Stand 5 Lens Pressing Member 6 Plastic Lens 7 Irradiation Hole 7a Shaft Center 11 Roller Member L Laser Beam

Claims (1)

[Scope of utility model registration request] 1. A reference table having a lower surface formed as a smooth reference surface and an irradiation hole whose axis is orthogonal to the reference surface, and a reference for allowing a laser beam to pass through the axis of the irradiation hole. A laser beam oscillator arranged above the table, a lens table below the reference table, which is arranged so as to be separable with respect to the reference surface of the reference table, and a roller member is attached to the pressing portion, and a lens pressing member for pressing to press the placed plastic lens in the lens mount from below the reference platform of the reference surface by the roller members, in a state pressed against the plastic lens <br/> reference plane, the lens pressing marking apparatus of a plastic lens, characterized in that the so that substantially moved parallel to the reference surface member in a direction irradiation holes along the reference plane is formed.