JPS5926429B2 - Positioning device for unshaped spectacle lenses - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positioning device for unshaped spectacle lenses necessary for obtaining spectacles in which the optical center of the spectacle lenses coincides with the pupil center of the person wearing the glasses.

Needless to say, it is preferable for the optical center of the eyeglass lenses to coincide with the pupil center of the person wearing the glasses.

However, if you fit a lens by aligning the optical center of the lens with the geometric center of the eyeglass frame, unless the center of the eyeglass frame coincides with the center of the pupil of the person wearing it, the pupil of the person wearing it will be affected. The center and the optical center of the lens do not coincide.

The present invention is a device for aligning the optical center of the lens with respect to the eyeglass frame at a desired position.It has a relatively simple structure and is extremely easy to operate, especially when setting the astigmatic axis. The object is to obtain a device that can be used accurately without requiring any skill.

To explain one embodiment of the present invention with reference to the drawings, reference numeral 1 in the figure
1 is a box-shaped machine stand with an open front, 1a is its upper plate, Ib is an opening provided in the upper plate 1a, and lc are both side plates.

In the present invention, the pivot shaft 3 is provided protrudingly on both sides of the base plate 2, and the pivot shaft 3 is connected to the both side plates Ic of the machine base 1 via bearings 4 at 180 mm.
Rotatably supported within a range of 0.

5 is a rotating handle fixed to the shaft 3, and 5a is its grip.

Reference numeral 6 in FIG. 4 indicates a positioning pin, and reference numeral T indicates a stopper, which allows the base plate 2 to be rotated within a range of 1800 degrees by operating the handle 5. In addition to the 1800 rotations as in this embodiment, the device for switching between the two different sides of the base plate 2 may be used in other ways, such as by sliding in the lateral direction. A transparent plate 10 is fixed on one surface 2a of the base plate 2 with a spacer 9 leaving a gap S in which a photograph 8 can be inserted between it and the upper surface 2a of the base plate, and on the other surface 2b of the base plate 2. A cylindrical support 12 for the unshaped lens 11 is fixed to the holder. On the other hand, a cylinder 13 is installed on the upper plate 1a of the machine base 1, surrounding the opening Ib, and a box 14 whose side surface is approximately triangular is provided on the upper part of the cylinder 13. An optical system is provided that allows you to look into the photograph 8 or the unshaped lens 11 to be placed.

That is, in FIGS. 2 and 5, Ll, L2, and L3 are objective lens groups, P is a prism, and L4 and L5 are eyepiece lens groups. Also, a center hole 15a indicating the geometric center of the eyeglass lens.
A lens reference shape 15 made of a transparent plate and having two small holes 15b for positioning is placed on the transparent plate 10 so that its geometric center coincides with the optical center F of the optical systems L1 to L5. be set to .

That is, two pins 16 that fit into the small holes 15b are provided protrudingly on the transparent plate 10. In addition, as shown in FIG. 6, a target T with a center position c and an angular scale n centered at this position c on a transparent plate is placed vertically and horizontally between the prism P and lens L4 of the optical system. Provided to be movable and adjustable. That is, as shown in FIGS. 2 and 3, a large frame plate 1
7 is provided vertically movably by a flanged guide roller 18 provided on the swash plate 14a of the box 14, and this frame plate 17
A pin 20 protruding from the upper part of the bell crank 22 via a bracket 19 is supported by a groove 22a provided at one end of a bell crank 22 pivoted by a shaft 21.
The adjusting screw 23 screwed into the side wall of the box 14 is placed opposite to the position b. Further, a small frame plate 25 is provided so as to be movable in the lateral direction by means of a flanged guide roller 24 protruding from the frame plate 17.
An adjustment screw 27 screwed into the side wall of the box 14 is attached to the rising piece 26a of the angle plate 26 fixed to one side of the frame plate 25.
to face each other.

In addition, in FIG. 3, 28 is the return spring of the frame plate 17, and 29 is the frame plate 2.
5 return spring. Further, the target T is fitted into the frame plate 25 and fixed with flanged screws 30. On the other hand, a rear bracket 32 is installed at the lower rear of the inside of the machine base 1 via a leaf spring 31 so as to be slightly tiltable in the front and back direction, and a shaft 33 is attached to a boss portion 32a provided at the upper end of the bracket 32 and is directed forward. A lateral protruding arm 34 curved in a substantially U-shape is fixed to the front end of this shaft 33, and a shaft 35 concentric with the shaft 33 is fixed to the other end of this arm 34. When a front bracket 36 having a hole 36a for holding the arm 35 horizontally is suspended from the front edge of the upper plate 1a of the machine base 1, and a vertical groove 36b is provided directly below the hole 36a, so that the arm 34 faces directly below. The shaft 35 is formed flat so that the shaft 35 can fit into the groove 36b, and the bracket 36 of the shaft 35 is formed flat.
A handle 37 is fixed to the protruding end of the twist. In addition, a holder 39 into which a lens suction tool 38 made of an elastic material such as rubber is fitted is fixed to the outside of the curved part of the arm 34, and when the arm 34 is directed directly downward, the lens fitted into the holder 39 is fixed. Suction tool 3
8 coincides with the optical center F of the optical systems L1 to L5. The above members 31 to 39 are the suction part 3
A suction device for suctioning 8 to an unshaped spectacle lens is constructed. Next, a method of using the apparatus of the present invention constructed as described above will be explained.

First, the person who wants to wear glasses selects a glasses frame 40 that does not have lenses in it yet, and then correctly places the glasses frame 40 on his/her face.
Using a special machine, take a photo 8 of the wearing condition at the same size as the actual item. Next, operate the handle 37 to rotate the arm 34 in the direction of arrow D from the state shown in the solid line diagram in FIG. In this state, the lens reference shape 15 is placed on the transparent plate 10 through the pin 16 and the small hole 15b as shown in FIG. Board 1
0, and observing it using the optical systems L1 to L5, as shown in FIG. 8, the lens reference form 15 and the eyeglass frame 40 shown in Photo 8 are perfectly aligned.

In this case, as shown in FIG. 11, the image of the target T is also visible in the actual visual field image seen through the optical systems L1 to L5, so the target T can be adjusted optically by operating the adjusting screws 23 and 27. The target T is moved horizontally and vertically by a and b with respect to the center F, and the center point c of the target T is aligned with the hole center as shown in the figure. Next, photograph 8 is removed, and the base plate 2 is turned over as shown in FIG. 9 by rotating the handle 5 18' in the direction of arrow E in FIG. Put on.

As shown in FIG. 9 or 13, this lens 11 is marked with a center point 11a indicating the center of the lens and, in the case of an astigmatism correction lens, a point 11b indicating the axial direction. If the lens manufacturer has already marked the lens, you can use it as is, but if the lens does not have a mark, mark it with a lens meter in advance. As mentioned above, the support 1
When the lens 11 placed on the lens 2 is observed using the optical systems L1 to L5, as shown in FIG.
Since images of 1a, 11b and the target T can be seen, the position of the lens 11 can be adjusted to align the center point 11a of the lens 11 with the center c of the target T.

Note that the points 11b on both the left and right sides of the astigmatism correction lens are as follows:
For example, if the astigmatism axis is 10 degrees, it is sufficient to align it with the 10 degree angle scale line of the target T, as shown in FIG.

In this case, when using the device of the present invention, since the center point c of the target T coincides with the center point 11a of the lens 11, the inclination angle of the axis can be directly adjusted by the angle scale n of the target T, so that it is accurate. Moreover, it has the advantage of being easy to operate. On the other hand, in the conventional method, there was only an angular scale centered on the optical center F as shown in Fig. 14, so for example, if the center 11a of the lens was set at the position shown in the figure and the astigmatic axis was set at 1', Since it is necessary to assume two parallel lines X and y as shown in the figure, it is not accurate and the work is difficult.

After the lens 11 has been set in the predetermined position as described above, the lens suction tool 38 is fitted to the holder 39 as shown in FIG. 2, and the arm 34 is moved as shown in FIG. 1 by operating the handle 37. Then, as shown in FIG. 2, if the handle 37 is pushed down in this state, the shaft 35 will descend in the groove 36b, and the arm 34 will also descend, as shown in FIG. is pressed onto the lens 11.

Therefore, the unshaped lens 11 is fixed to the lens suction tool 38. In this case, the center of the suction tool 38 is the optical system L1~
Since it is aligned with the optical center of L5, the suction tool 38 is correctly attracted to a position on the lens 11 that coincides with the geometric center of the eyeglass frame. Therefore, if the unshaped lens 11 is applied to the lens peripheral processing machine via this suction tool 38, the unshaped lens 11 will be properly shaped, and if you wear glasses fitted with this lens, the optical center of the lens and the pupil center will always be aligned. will match correctly. As mentioned above, the device of the present invention has 1
It has the advantage of being easy to manufacture because it uses only one set of optical systems and has a relatively simple structure.

In addition, since the target can be moved and adjusted, the overall work can be done easily and accurately, and the astigmatism axis can be set accurately without requiring any skill.

[Brief explanation of drawings]

Figure 1 is a front view of the device of the present invention, Figure 2 is A-A in Figure 1.
Cross-sectional view, Figure 3 is a BB cross-sectional view of Figure 2, Figure 4 is a cross-sectional view of Figure 1.
5 is an explanatory diagram of the optical system of the device of the present invention, FIG. 6 is a front view of the target, FIG. 7 is an explanatory perspective view of the base plate, and FIG. 8 is a photograph. FIG. 9 is a plan view showing the relationship between the transparent plate and the standard shape of the lens; FIG. 9 is a perspective view for explaining the turned-over base plate portion; FIG. 11 and 12 are diagrams showing visual field images of the device of the present invention, FIG. 13 is a plan view of an unshaped lens, and FIG. 14 is an explanatory diagram showing a method of setting an astigmatic axis using a flattening device. 1... Machine base, 2... Base plate, 3...
... Pivot of base plate 2, 5 ... Handle, 8 ...
...Photograph, 10...Transparent plate, 11...
・Unshaped lens, 12... Lens support, 1
3... Cylinder for optical system, 14... Box for attaching optical system, Ll, L2, L3...
Objective lens group, P... Prism, L4, L,...
...Objective lens group, 15... Lens reference form, 15a... Geometric center of reference form 15,
15b...Positioning hole, F...Optical center, 16...Pin on transparent plate 10, T...
...Target, C...Target center position, n...Angle scale, 17...Large frame plate, 18...Guide roller with flange , 22...
... Bell crank, 23 ... Adjustment screw, 24
...Guide roller with flange, 25...Temporary small frame, 27...Adjustment screw, 31...Plate spring, 32...Rear Bracket, 33...
...Axis, 34... Laterally protruding arm, 35...
...Flat shaft, 36...Front bracket, 36
a...hole, 36b...vertical groove, 37...
...Handle, 38...--Lens suction tool, 3
9... Holder, 40... Glasses frame.

Claims (1)

[Claims] 1. Two different surfaces 2a and 2b can be set alternately at the same position using a switching device, an optical system is provided that allows viewing of the set surfaces, and a spectacle frame 40 is placed over one surface 2a to take pictures. A transparent plate 10 is fixed with a gap S that allows the insertion of the photo 8, and a standard shape 1 of a transparent lens is molded on the transparent plate 10 in the shape of the eyeglass frame 40.
5 is provided so that it coincides with the center of the optical system, and a support 12 for the unshaped lens 11 is fixed on the other surface 2b, and a suction device whose center coincides with the optical center of the optical system is provided. A suction device for suctioning the unshaped lens 11 placed on the support 12 by means of a tool 38 is provided, and a target T having a reference mark representing the center position C and an angle scale n on a transparent plate is attached to the optical system. A positioning device for an unshaped lens, characterized in that the system is configured to be movable and adjustable vertically and horizontally within a plane perpendicular to the optical axis of an optical system.