JPS59212225A - Manufacture of concave lens - Google Patents

Abstract

PURPOSE:To stably supply small-diameter concave lenses having a desired curvature radius by a method in which a fluid is injected into a molten lens material to form a concaved face to be the surface of lens. CONSTITUTION:A molten lens material 2 housed in a melting container 1 is dripped from a discharge nozzle 3 at a fixed rate, whereupon a fluid 5 is injected into the molten lens material 2 at a given interval from a fluid discharge nozzle 4 set coaxially with the nozzle 3 in the container 1. The molten lens material 2 having the fluid 5 inside is drawn out downwards in the direction of arrow A to form an uniform diameter rod 7 or the material 2 is cut by a cutter 6 operating in the direction of arrow B to form a cut piece 8. Also, according to the curvature radius of the lens, the fluid is injected into the lens material while controlling the amount of the fluid to be injected according to the viscosity and temperature of the lens material and the curvature radius of the lens to obtain a concave lens of a given curvature radius.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a concave spherical lens with a minute diameter used as an objective lens of a microscope, an acoustic lens, or the like.

It is considered difficult to manufacture a concave spherical lens close to a hemisphere with high precision regardless of the radius of curvature.

Furthermore, it is impossible to polish a concave spherical surface with a radius of curvature of Q, 5MTR or less with high precision (it was close to the second level).
No. 8 discloses a means for intentionally producing fine bubbles in a molten lens material by taking advantage of the high sphericity of the bubbles in the molten material. However, in this disclosed prior art, in order to obtain a concave spherical lens having any desired radius of curvature, it is necessary to search for bubbles having the desired radius of curvature by measurement, which is extremely troublesome. Another method is to install many air holes of the same size so that air bubbles of a certain size are formed, but in order to obtain holes of any desired size, it is difficult to It was a hassle to have to change the size. Therefore, in the prior art, there was a problem in that it was difficult to stably supply a concave spherical lens with a minute diameter that did not have a desired radius of curvature.

An object of the present invention is to provide a method for manufacturing a concave spherical lens that can solve the above-mentioned problems of the prior art and stably supply a concave spherical lens with a minute diameter and an arbitrary desired radius of curvature.

Hereinafter, the details of this invention will be explained according to examples.

FIG. 1 shows a first embodiment of the present invention, in which a lens material 2 melted at a constant temperature necessary for discharging is stored in a melting container 1, and this melted lens, Id.
The material drips down from the monthly discharge nozzle: 3 at a constant speed. At this time, a fluid 5 necessary to obtain a desired radius of curvature is injected into the melted lens material 2 at regular intervals from a fluid discharge nozzle 4 installed coaxially with the material discharge nozzle 3 in the melting container 1. be done. The molten lens material 2 containing the fluid 5 inside is drawn downward in the direction of the arrow at the same speed as the discharge speed, and as shown in FIG.
7 or as a gob 8 as shown in FIG. 3 which is divided into pieces by material cutting scissors 6 moving in the direction of arrow B. In this way, according to the present invention, fluid is injected into the molten lens material according to the radius of curvature of the lens required, and the injection amount is adjusted according to the viscosity and temperature of the lens material or the size of the radius of curvature. For example, by controlling the volume of the fluid 5 injected into the molten lens material 2, it is possible to stably supply a concave spherical lens having a minute diameter with any desired radius of curvature.

In this first implementation, the fluid 5 is Ar, HeX
It may be H2 gas, or Sn, Zn, A6
It may be a molten metal such as. Also rod 7 or gob 8
For machining after cooling, a very common cutting method may be used, or in the case of rod 7, a notch of an appropriate depth is made in the cutting part and heated with a torch to cut it by thermal stress. It's okay. In particular, when cutting Lot 7 due to thermal stress, two concave spherical lenses can be obtained by controlling the cutting position to iEl'6.

In particular, when a concave spherical surface with high A'1 degree is required, the first
As shown in FIG. 1, it is also possible to reheat and melt the once cut lump 8 in molten SnQ stored in a container to make the sphericity like clay. In particular, when the fluid 5 is a gas,
It is also possible to adjust the radius of curvature of the sphere by adjusting the external pressure while the lens material is melted, for example by applying external pressure to the gob 8 before remelting. That is, the volume of gob 8 melted in the melt m1Henq differs depending on the specific gravity of Sn and the gob month, and the volume of gob lumber -1 or lighter increases by 8'j, and the volume increases as a whole. Although the shape of the bubbles 5 becomes flat, the shape of the bubbles 5 in the gob 8 can be maintained as a perfect sphere by sufficiently melting 1τ1 until the shape becomes stable.

FIG. 5 shows a second embodiment of the invention, in which a fluid ejecting nozzle is inserted into the lens material I2 being melted in the melting vessel 10, which is being heated by a heating device (not shown). 11, and the fluid ejection device and the nozzle moving device (none of which are shown) move the fluid ejection nozzle 11 in the directions of arrows C and D and in the direction of arrow E, so that the melted lens is removed. The fluid 13 is discharged and injected into the material 12 at a constant depth and interval so as to cover the entire lens material 12, and the fluid discharge nozzle 11 is fully extended to complete the discharge. The fluid discharge nozzle 11 can be moved downward or upward during fluid discharge in order to improve the cutting of the fluid I3 from the nozzle tip during fluid discharge.

In FIG. 5, the fluid discharge nozzle 11 faces upward, but when the fluid 13 has a higher specific gravity than the lens material 12, it faces downward. In this way, the direction of the fluid discharge nozzle 11 is determined depending on the specific gravity of the fluid 13 and the lens material 12, and in order to improve the cutting of the fluid 13, the nozzle 11 is rotated in the opposite direction to the fluid discharge direction. move back in the direction. In this way the fluid 13 is melted throughout the month 12
After dispensing / ζ, wait until it becomes a perfect sphere (1.0"11"). After slowly cooling it to avoid distortion, take it out from the melting container 10, take it out and put it on the lens. The middle part is cut out and processed into the required fIc shape.The fluid 13 is the same as in the first embodiment.

FIG. 6 shows a third embodiment of the present invention, in which a power Il heating device (shown C and I) is connected to an I4
Inside, there is a J plate 10 that divides the surface of the metal 18 in half, and on one side of the divided part there is a lens 4 knee 1.
．． J 7 is floating in a molten state, and it is already 6;
τ, the body discharge nozzle 15 is turned on. The fluid discharge nozzle 15 is inserted into the melted lens paulownia material 170111 through the partition plate 16 in the directions of arrows C and D and the arrow E by a nozzle moving device (also not shown) in the fluid discharge nozzle hole. While moving in the direction, a fixed amount of fluid 19 is discharged and injected at fixed intervals so as to cover the entire lens paulownia material 17. Fluid 19 is molten metal 1
8 and lens material 17
Use one with a specific gravity smaller than that of Fluid discharge nozzle 15
is θ at the time of discharge; mouth weight 9 can be moved 10 degrees or less to improve sharpness. The fluid] 9 discharged in this manner floats through the molten metal 18 and eventually enters the molten lens 17 as well. Fluid] 9 or Lens interest $
- When the lens material 117 is sufficiently penetrated, the accuracy of the melting container 11 is lowered and the lens material 17 is slowly cooled to prevent the lens material 17 from forming. After cooling, remove the lens from the molten metal bath.''17
, and add T in the same manner as in the second embodiment.

As explained above, the present invention uses a concave spherical surface formed by melting the lens (2 fluids) as the lens surface, so by controlling the pattern of the injected fluid. It is possible to easily obtain a concave spherical surface with any desired radius of curvature, and this has the effect of stably supplying a concave spherical lens having any desired radius of curvature.

In addition, in the case of the first embodiment of the present invention, by forming the second injection material into a lot shape, it is easy to process the spherical part into a desired shape, and the spherical part has a different radius of curvature. Suitable as a base for continuously producing concave spherical surfaces.

If the fluid still contains gas, it is also possible to adjust the radius of curvature of J3JS by melting the lens material with the fluid inside and applying external pressure.

Further, in the case of the second embodiment of the present invention, the same effect as described above is obtained, and since the device is still simple, it is possible to
Suitable for producing mouths and throats of food products.

In addition, in the case of the third embodiment of this invention, a uniform concave spherical lens can be obtained by utilizing the buoyancy that acts on the fluid during the chaotic lens insertion. . Also, or
Since the concave spherical surface formed by the lens body is located near the other surface of the lens, it is easy to process it after forming the IJ'y shape.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an apparatus for carrying out the manufacturing method according to the first embodiment of the present invention, FIG. 2 is a side view showing a rondo made with the apparatus shown in FIG. 1, and FIG. FIG. 1 is a plan view showing a gob made with the device shown in FIG. 1, FIG. 4 is a sectional view showing a device for reheating and melting the gob to improve its sphericity, and FIG. 5 is an 8<2 embodiment of the present invention. FIG. 6 is a sectional view showing an apparatus for carrying out the manufacturing method, which is a third embodiment of the present invention. 1.10.1/l...Melting container, 2, J2.17-Melting lens material, 11.11.15...Fluid discharge nozzle, 5.13.19
··fluid. Agent Patent Attorney Akira Watanabe 2 holes 7 recesses 2 wards Izumi 3 Diagram 2i > 44 Circular holes 5 recesses ∆ Procedural amendment July 1982 58i1:/Tera Kegan No. 8501553
Relationship with the case of the person making the amendment Name of the person making the amendment (Name: Ell-) (Q37) Olympus Optical Engineering Co., Ltd.
L Taishikikai jq-Representative Shigeru Kita 4, Agent 〒227, j-Uran
045-971-1370 Address: Ij7i7, Kanayo Prefecture
Hyoichi Midori-ku Ichikejani-cho '11.651/Mother J-2 Name (6708) fpJ! +! ±71. Y side 11f] 25 Date of amendment order Self Shu 11 Kuchisho Naitani (1);,;r; 61 N1 is corrected as shown in the attached correction drawing. Added the boundary line between 6th grade, lens material 17 and bath finance YA18. Koi 1 Sun-#”: 'J's eye view (1) Revised city map 1 [11 letters

Claims (1)

[Scope of Claims] 1. A method for manufacturing a concave spherical lens, characterized in that the lens surface is a concave spherical surface formed by injecting a fluid into a molten lens material. 2. The method for manufacturing a concave spherical lens according to claim 1, wherein a concave spherical lens having any desired radius of curvature is obtained by adjusting the volume of fluid injected into the molten lens material. 3. Claim 1, in which the fluid is injected by ejecting iJj L without moving the fluid ejecting nozzle in the molten lens material.
>The method for manufacturing a concave spherical lens described in 3H. 4 Flow f4 for discharging fluid and injecting it into the molten lens material
- The method of manufacturing a concave spherical lens described in 44, Fluid 1 Fist, in which the direction of the discharge nozzle is determined by the magnitude of the specific gravity of the fluid and the lens phase. 5. For the lens material melting on the molten metal bath,
2. The method of manufacturing a concave spherical lens according to claim 1, wherein the fluid is injected by making use of buoyancy acting on the fluid with low specific gravity.