JPS63295457A - Formation of optical lens - Google Patents

Abstract

PURPOSE:To enable production of an optical lens having an arbitrary refractive index without executing mechanical polishing by implanting the ions of a specific element by an ion implanting machine to a glass plate having both parallel faces, and changing the concn. of the implanted ions continuously radially from the center of the glass plate. CONSTITUTION:After the surface of the glass plate 1 having both the parallel faces is smoothed by sufficient polishing, the glass plate is set to the ion implanting machine and the boron ions 2 are implanted thereto. The implanted ions are continuously changed from the central part to the circumferential edge part of the glass late 1 and are so controlled that the rate of injection is uniform on the circle-radial circle from the center. The transparency of the glass plate which is decreased by the ion implantation is restored to the initial transparency by annealing the glass plate for 2hr at 200 deg.C after the ion implantation. The optical lens of an arbitrary focal length is easily produced by the adjustment of the rate of the ion implantation without mechanically polishing the glass.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing an optical lens used in optical equipment and the like.

[Conventional technology]

2. Description of the Related Art Optical lenses are commonly used as optical instruments, and are extremely common and used in a variety of fields.

An example of a conventional optical lens manufacturing method will now be described with reference to FIG. 3. Cut the optical glass (1) to the desired size (Fig. IK3) and polish one side to have the desired radius of curvature (Fig. 3).

Next, the glass is polished so that the remaining one side has the same radius of curvature tri, and a convex lens as shown in Figure 3 (re) is finally formed. Conventional lenses are created using the method described above.

Polishing technology required a high degree of skill and skill.

Further, when a desired focal length f is required, the focal length f is assumed to be the refractive index of the glass and the space, respectively, as n and ~.

It is expressed as

[Problem to be solved by the invention 1 As mentioned above, the focal length f of a lens depends on the radius of curvature r, but it is extremely difficult to process the glass surface to the desired radius of curvature, and requires advanced technology. Therefore, it is necessary to prepare various polishing jigs.

It was not suitable for mass production. Therefore, it has been extremely difficult to create an optical lens of any desired shape. Furthermore, when installing optical lenses in optical equipment, etc., it is necessary to design the optical system using lenses with different shapes.
There were problems such as the design being complicated.

This invention was made to solve the above-mentioned problems and does not use mechanical polishing.

The purpose of the present invention is to obtain a method for easily creating an optical lens of any focal length.

[Means for solving problems]

In the method for producing an optical lens according to the present invention, atoms or molecular ions of an optical glass are implanted in a desired pattern.

[Effect]

Ion implantation in this invention has the effect of changing the optical refractive index of optical glass, so an optical lens can be formed by implanting ions in a desired pattern.

〔Example〕

FIG. 1 is a diagram for explaining the invention in detail.

3 is a graph showing the relationship between the amount of ion implantation into optical glass and the change in light refraction In. As the amount of ion implantation increases, the refractive index n of light changes almost proportionally. An optical lens is formed using this relationship between the amount of ion implantation and the refractive index. An example is shown in FIG. 2 below. Optical glass (1) (
(approximately 3cm thick) is cut out so that both surfaces are parallel and thoroughly polished.

This optical glass (1) is set in an ion implanter and ions are implanted. The ions (2) to be implanted are boron ions (CB+), and the center of the optical glass (1) is 10III.
ONS/(- injection amount and 0 peripheral area is 106 l0N8
The injection amount is %. During this period, the injection amount is varied in a linear manner, and the injection amount is controlled to be uniform on the same radius circle from the center. Typically, implanting ions into glass reduces the transparency of the glass.

This is because the implanted ions form a color center in the glass, and the glass itself becomes colored.

Therefore, after ion implantation, annealing is performed at a temperature of 200° C. for about 2 hours to diffuse the color center and restore transparency. As a result of this gradual twisting, the refractive index gradually changes from the center of the glass to the periphery of the glass, forming an optical lens.

Next, other embodiments will be described. Technological advances in ion implantation equipment have been remarkable, and it has become easier to control the amount of ion implantation. - 10,000, recently focused ion beam (F
IB) With the advent of exposure equipment, ion beam phosphorography has become relatively easy to perform. As in the previous example, a glass plate is polished and sequentially irradiated with gas9m ions (Ga'') using this FIB exposure device.In addition to the ion beam exposure device, exposure using a liquid ion source is also possible. This makes it easy to control the ion beam.

In this case as well, of course, the ion irradiation amount is varied linearly from the center to the periphery. At an accelerating voltage of 25 kaV, the irradiation amount is 700 pA at the center and 350 pA at the periphery. Thereafter, as in the previous embodiment, annealing is performed at a temperature of 200° C. for about 2 hours in order to eliminate the color center.

In the above embodiment, the method 1c of increasing the amount of ions implanted in the central region -ζ has been described, but the reverse method may also be used.

In addition, the same effect can be achieved by implanting only an arbitrary portion, as long as a change in the refractive index can be obtained. Further, although the B" ion has been described, other ions may be used as long as the refractive index can be expected to change (the same effect can be achieved).

〔Effect of the invention〕

As explained above, in this invention, an optical lens is created by ion implantation without using mechanical polishing of glass, so any refractive index can be obtained by simply controlling the amount of ion implantation, and any focal length can be obtained. It is easy to obtain an optical lens with Furthermore, micro optical lenses, which have been difficult to produce in the past, can be easily formed using the method of the present invention. Furthermore, the removal of lens aberrations, which conventionally required sophisticated optical polishing techniques, can also be achieved by performing ion implantation into conventional optical lenses.

As described above, according to the method IC of the present invention, a flat optical lens can be realized, the thickness and shape of the lens can be greatly improved, and the optical machine can be designed compactly.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the invention in detail. FIG. 2 is a side view showing the implementation status of one embodiment of the present invention;
FIG. 83 is a side view showing an example of a conventional optical lens manufacturing method. In the figure, (1) is an optical glass, and (2) is an ion. Note that the same reference numerals in the table indicate the same or equivalent parts.

Claims (1)

[Claims] (1) An optical lens characterized in that an optical lens is obtained by injecting ions into a glass plate in a required implantation amount pattern and changing the optical refractive index of each portion according to the amount of ions implanted into each portion. How to make.