JP2003083845A - Printing device of lens-meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens-meter having little dispersion of prints and a long service life of a printing needle. SOLUTION: In this printing device 30 of the lens-meter for forming prints on a test lens 70 held by a lens holding means 80, the printing device 30 includes at least three printing units 41a, 41b and 41c arranged in a line, and the printing units 41a, 41b and 41c have respectively bodies 42a, 42b and 42c and printing needles 44a, 44b and 44c projecting from the bodies toward the test lens 70 held by the lens holding means 80, and the tips of each printing needle are positioned roughly along a bending shape of the print formation surface of the test lens 70.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens meter for measuring the optical characteristics of a lens to be inspected, and more particularly to printing a dot indicating the optical center position or the axial direction of the cylindrical refractive power on the lens to be inspected. Of the marking device.

[0002]

2. Description of the Related Art In a lens meter for measuring the optical characteristics (spherical refractive power and cylindrical refractive power) of a lens to be inspected such as a spectacle lens, the lens to be inspected is placed on a lens pedestal and held on the lens pedestal. After measuring the optical characteristics of the tested lens, dots or marks indicating the optical center position and the axial direction of the cylindrical refractive power are formed on the lens surface by the marking device of the lens meter.

As shown in FIG. 1, a conventional marking device 102.
Is the three marking point units 108, 11 forming the marking points.
0, 112 and the marking point units 108, 110, 112
And a marking point lever 106 used when sliding the supporting portion 104 up and down. Each of the three marking point units 108, 110, and 112 configured from the same unit includes a marking point needle protruding toward the side facing the lens 114 to be inspected. In the three marking point units 108, 110, 112, the tips of the three marking point needles are arranged in a line. The marking needles arranged on a straight line are
Is urged so as to be retractable with respect to the main body of the marking point unit so as to follow the curved shape of the marking point forming surface.

The test lens 114, as shown in FIG.
Usually, it has a meniscus shape having a convex upper surface 116 and a concave lower surface 118. Then, the convex upper surface 116 and the concave lower surface 1
18 are arranged so as to face the marking device 102 side and the lens cradle (not shown) side, respectively. Since the mark forming surface is the convex upper surface 116, the central portion of the convex upper surface 116 is the most protruding.

In the marking device 102 shown in FIG. 1, since the tips of the marking needles are arranged at the same height,
The marking needle of the marking unit 110 located at the center comes closest to the central portion of the convex upper surface 116. That is, 3
The tips of two marking needles do not touch at the same time. When the marking point needle of the marking point unit 110 located at the center comes into contact with the central portion of the convex upper surface 116, the marking point needles of both lateral marking point units 108 and 112 and the side edge portion of the convex upper surface 116 are A gap G exists between them.

The left and right marking point units 1 are arranged so that three marking points are surely formed on the convex upper surface 116 of the lens 114 to be tested.
The three marking point units 108, 110, 112 are simultaneously pushed down until the marking point needles 08, 112 abut both sides of the convex upper surface 116. Left and right marking unit 108, 1
When the twelve marking needles contact both sides of the convex upper surface 116,
The marking point needle of the central marking point unit 110 is strongly pushed inside the marking point unit body, whereas the marking point needles of the left and right marking point units 108, 112 are pushed slightly inside the marking point unit body. Is. That is, when forming the marking point, the pressing force of the marking needle against the convex upper surface 116 of the lens 114 to be tested differs at the marking point location. The marking needle is made of a soft material such as felt, and when a reaction force of a strong pressing force acts on the needle tip, the thin and soft needle tip is deformed as if it was crushed. Therefore, as compared with the mark points formed on both sides, the mark point formed in the center has a large size and a high density. That is, there is a problem that the imprint points formed on the convex upper surface 116 vary.

Further, since a large pressing force is constantly applied to the marking needle of the central marking unit 110 that is pushed in greatly, if the marking formation is repeated many times, the central marking unit 110 becomes thin. The tip of the soft marking needle is crushed. That is, there is a problem that the marking needle of the central marking unit 110 is deteriorated.

SUMMARY OF THE INVENTION Therefore, a technical problem to be solved by the present invention is to provide a lens meter which has a small variation in marking points and can perform marking with high accuracy.

[0008]

In order to solve the above technical problems, the mark point unit of the lens meter according to the present invention has the following features.

That is, in a marking point device of a lens meter for forming marking points on the lens to be tested held by the lens holding means, the marking point device comprises at least three marking point units arranged in a line. Each of the marking point units has a main body and a marking point needle projecting from the main body toward the lens to be measured held by the lens holding means, and the tip of each marking point needle has a marking of the lens to be measured. It is characterized in that it is positioned so as to substantially follow the curved shape of the point forming surface.

According to the above arrangement, the tip of each marking needle of each marking unit is positioned so as to substantially follow the curved shape of the marking surface of the lens to be measured. Therefore,
When the examiner forms a marking point on the marking point forming surface of the lens to be tested held by the lens holding means, an unreasonable pressing force is not applied to each marking point needle, so there is little variation in the marking point and marking is possible. Can be performed accurately.

As the marking point unit, the marking point units having different shapes can be used so as to substantially follow the curved shape of the marking point forming surface of the lens to be inspected. However, it is preferable that the marking point units are made of the same material in view of the complexity of distinguishing the different marking point units individually and the high cost of using the different marking point units individually. Further, the respective marking point units formed of the same thing are arranged so as to substantially follow the curved shape of the marking point forming surface.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention will be described in detail below with reference to FIGS.

FIG. 2 is an explanatory view showing how the marking point device 30 of the lens meter 1 according to the present invention forms a marking point on the lens 70 to be inspected. FIG. 3 is a perspective view showing the lens meter 1 including the marking device 30 according to the present invention. Figure 4
FIG. 3 is an enlarged view of a main part showing a marking device 30 according to the present invention. FIG. 5 is an enlarged view of an essential part showing a method of operating the marking device 30 in the lens meter 1. (A) shows how the marking point unit is rotated from the horizontal retracted position to the vertical marking point position. (B) shows how the marking point unit is pushed down.
(C) shows how a marking point is formed on the lens 70 to be inspected by the marking point unit.

The lens meter 1 shown in FIG. 3 has a lens receiver 50 on which the lens 70 to be inspected is mounted, a lens holding portion 80 for holding the lens 70 to be inspected, and marking points for forming marking points on the lens 70 to be inspected. An optical unit 2 for measuring the optical characteristics of the device 30 and the lens 70 to be inspected mounted on the lens receiver 50.
0, a display / operation unit 60 that displays the optical characteristics of the lens 70 to be measured measured by the optical unit 20 and inputs a measurement operation, and a printer 12 that prints out the measurement result. A control unit (not shown) that controls the entire lens meter 1 is built in the housing 10.

The substantially cylindrical lens receiver 50 includes an optical unit 20.
It incorporates a light receiving optical system (not shown) for receiving the passing light after passing the measurement light beam emitted from the test lens 70. Therefore, the optical unit 20 and the lens receiver 50
With the above, a measurement optical system for measuring the optical characteristics of the lens 70 to be inspected is configured.

As shown in FIG. 2, the lens 70 to be inspected has a convex upper surface 72 curved in a convex shape and a concave lower surface 74 curved in a concave shape.
It has a meniscus shape with and. Test lens 70
The lens 70 to be inspected is placed on the lens receiver 50 so that the convex upper surface 72 of the lens faces upward, that is, in the direction of the marking device 30.

Display / operation unit 6 provided on the front side of the examiner
0 includes a display 62 and operation buttons 64.

On the side surface on the front side of the pillar 16 of the housing 10,
Two slits 18 extending in the vertical direction are provided.

A marking point device support arm 32 is inserted through one of the slits 18 and slidably arranged in the vertical direction. At the front end of the marking device support arm 32,
The marking point unit support member 34 is fixed. The marking point unit support member 34 includes a rotation shaft 40 that rotates around the marking point unit support arm 38. The marking point unit support arm 38 has three marking point units 41 on the front side.
a, 41b, 41c, and a marking lever 36 on the back side. Three marking point units 41a, 41b, 41c
Are arranged side by side.

A lens holding part support arm (not shown) is inserted through the other slit 18 and is arranged so as to be slidable in the vertical direction. A holding pin support member 86 is fixed to the front end of the lens holding unit support arm. Abbreviation U
The V-shaped holding pin support member 86 includes a lens holding pin 82 that projects toward the lens 70 to be measured, and a lens holding lever 84 that extends from the lens holding portion support arm.

When the marking point device 30 is moved to a predetermined marking point position,
The center marking point body 42b is arranged in the U-shape of the holding pin support member 86, and the left and right marking point bodies 42a, 42c are arranged on both sides of the U-shape.
The central marking point body 42b is used to print a dot indicating the optical center position. In addition, the left and right marking point bodies 42a,
42c is used to print dots indicating the axial direction of the cylindrical refractive power.

Three marking point units 41a, 41b, 41
The same structure is used for all c. These are the marking point bodies 42a, 42b, 42c, an ink tank (not shown) provided inside the marking point bodies 42a, 42b, 42c, and a thin felt soft marking connected to the ink tank. Point hands 44a, 44b, 44
with c and. Felt marking needles 44a, 44b, 4
4c, so that the protrusion length of the needle tip from the marking point bodies 42a, 42b, 42c is about 0.5 mm,
It is biased from behind by elastic members such as rubber and springs.
Therefore, due to the elastic member such as rubber and spring, the pressing force of each of the marking needles 44a, 44b, 44c against the convex upper surface 72 of the lens 70 to be measured is generated when the marking point is formed.

As shown in FIG. 2, the tip of the central marking point body 42b is positioned higher than the tips of the left and right marking point bodies 42a and 42c, that is, the convex upper surface 7 of the lens 70 to be tested.
A central marking point body 42b is disposed in the center of the marking point unit support arm 38 so as to follow the curved shape of 2. It depends on the radius of curvature of the lens 70 to be inspected. For example, the needle point of the central marking point body 42b is set to a position higher by approximately 3 mm than the needle points of the left and right marking point bodies 42a and 42c.

Each marking point unit 41a, 41b, 41c
Is in the horizontal retracted position shown in FIG. 3 when no marking point is formed. In this state, when the marking point lever 36 is pushed down so as to rotate toward the back side, the marking point unit support arm 38 rotates about the rotation shaft 40.
As a result, the marking point needles 44a, 44b, 44c of the marking point units 41a, 41b, 41c face the lens 70 to be inspected, and the vertical marking point position shown in FIG. 4 is obtained.

Next, with reference to FIG.
A method of forming a mark point on 0 will be described.

As shown in FIG. 5A, the lens holding portion 8
The lens holding pin 82 of 0 is in contact with the lens 70 to be inspected. With the lens 70 held lightly by the lens holding pin 82, the examiner gently puts his or her hand on the edge of the lens 70 to be inspected. Then, the examiner looks at the image of the subject lens 70 displayed on the display 62 of the operation / display unit 60,
The lens 70 to be inspected is moved so that the mark indicating the optical axis of the lens 70 to be inspected is aligned with the center mark previously displayed on the display 62. That is, the optical center position of the lens 70 to be tested is aligned with the optical measurement system. At the same time, by the measurement light emitted from the optical unit 20,
The optical characteristics of the lens 70 to be tested are measured. As a result, various optical characteristic values such as the refractive power S of the spherical lens, the refractive power C of the cylindrical lens, and the axial direction A of the cylindrical lens are measured.
After that, when the marking point lever 36 of the marking point device 30 is pushed down so as to rotate toward the back side, the marking point units 41a, 41b, 41c, which were in the horizontal retracted positions, become the vertical marking point positions.

As shown in FIG. 5B, when the marking lever 36 of the marking device 30 is pushed down in the direction of the arrow, all the marking units 41a, 41b, 41c slide vertically downward.

All the marking point units 41a, 41b, 41
When c is simultaneously slid vertically downward, FIG.
As shown in FIG. 5, all of the marking point needles 44a, 44b, 44c of the marking point units 41a, 41b, 41c,
It contacts the convex upper surface 72 of 0. At this time, the marking needle 44a,
The tip ends of 44b and 44c are the convex upper surface 7 of the lens 70 to be measured in advance
The marking point units 41a, 41 so as to follow the curved shape of FIG.
Since the marking point needles 44a, 44b, 44c of b and 41c are arranged, an excessive pressing force does not act on the central marking point needle 44b of the central marking point body 42b. As a result, on the convex upper surface 72 of the lens 70 to be inspected, three mark points having no variation in dot size or density are formed.

In the above embodiment, the three marking point units 41a, 41b, 41c do not necessarily have to be the same. For example, all the marking units 4
1a, 41b, 41c marking needles 44a, 44b, 44
The protrusion length of c is approximately 0.5 mm, and the central marking point body 42b
Of the left and right marking point bodies 42a, c by approximately 3 mm, and other marking point units 41a, 41b, 41c having the same configuration are prepared. The upper end positions of 42b and 42c can be aligned. With this configuration,
The tip of each of the marking needles 44a, 44b, 44c can roughly follow the curved shape of the marking surface of the lens under test. In addition, the marking point device usually includes three marking point units 41a and 4a.
1b and 41c can sufficiently exert the marking function of printing dots indicating the optical center position and the axial direction of the cylindrical refractive power on the lens to be inspected, but use four or more marking units. It may be one.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing how a conventional marking device for a lens meter forms a marking point on a lens to be tested.

FIG. 2 shows a marking device for a lens meter according to the present invention,
It is explanatory drawing which shows a mode that a mark point is formed on a to-be-tested lens.

FIG. 3 is a perspective view showing a lens meter including a marking device according to the present invention.

4 is an enlarged view of an essential part showing a marking device in the lens meter of FIG.

5 is an enlarged view of an essential part showing a method of operating a marking device in the lens meter of FIG. (A) shows how the marking point unit is rotated from the horizontal retracted position to the vertical marking point position.
(B) shows how the marking point unit is pushed down. (C)
Shows how a marking point is formed on the lens to be inspected by the marking point unit.

[Explanation of symbols]

1 lens meter 10 housing 12 Printer 16 props 18 slits 20 Optics 30 marking device 32 Marking device support arm 34 Mark unit support member 36 Marking lever 38 Mark Unit Support Arm 40 rotation axis 41a Right marking unit 41b Central marking unit 41c Left marking unit 42a Right side marking body 42b Central marking point body 42c Left marking point body 44a Right hand marking needle 44b Central marking needle 44c Left hand marking needle 50 lens receiver 60 Operation / display 62 display 64 operation buttons 70 Test lens 72 convex upper surface 74 concave bottom 80 Lens holder 82 Lens holding pin 84 Lens holding lever 86 Holding pin support member

Claims (2)

[Claims] 1. A marking device for a lens meter, which forms markings on a lens to be tested held by a lens holding means, wherein the marking devices are at least three marking units arranged side by side in a line. Each of the marking point units has a main body and a marking point needle protruding from the main body toward the lens to be measured held by the lens holding means, and the tip of each marking point needle has a lens to be measured. The lens meter is positioned so as to substantially follow the curved shape of the mark forming surface. 2. The marking point units are made of the same material, and the marking point units are arranged so as to substantially follow the curved shape of the marking point forming surface. The described lens meter.