JPH03260601A - Method for changing focal point of lens - Google Patents

Abstract

PURPOSE:To obtain a focal point variable lens by simple constitution by arranging two ring-like rod bodies and two annular bodies on the periphery of a deformable double plate lens, and rotating these bodies to extend/contract the lenses. CONSTITUTION:The peripheral edge of two transparent and deformable single plate lenses are made airtight to form a freely extensible double plate lens 2. The rod bodies 3, 4 having prescribed extensible structure are arranged on respective peripheries of the single plate lenses constituting the double plate lense 2 and two annular bodies 5, 6 having a diameter larger than the outer diameter of the double plate lens are arranged on the periphery of the double plate lens. The bodies 5, 6 can be rotated mutually in the reverse directions and the periphery of the double plate lens 2 is extended/contracted through the rod bodies 3, 4 by rotating the bodies 5, 6 respectively in the clockwide and counterclockwise directions to change the thickness of the main part of the lens 2, so that the focal point of the lens 2 can be optionally changed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a single lens, such as a concave lens or a convex lens, whose focal point can be freely changed.

(Conventional technology) Until now, there was no lens that could change its focus.

(Problem to be solved by the invention) Traditionally, optical lenses have been molded from glass.

This focus is always constant, and we need to change it.

I had no choice but to change the fulcrum distance.

(Means for solving the problem) Instead of solid glass, a device that can freely compress and expand the outer periphery of this lens is connected to the outer periphery of a free-form lens with appropriate hardness, and the thickness of the main part of the lens is reduced. By changing the angle, the refraction of light was changed and the focal point was set at a free position.

(Function) The lens becomes a concave-convex lens due to the rotation of the lens outer annular body, and its focal point becomes free.

(Example) Several examples of implementation of this invention will be described below based on the drawings.

1, 2, and 3 are standard structural diagrams of a variable focus lens according to the present invention, and are approximately A.

is a plan view, and B is a central sectional view thereof.

In the figure, the outer periphery of a free-form lens (1) has a desired cross-sectional shape of at least two rings (two rows), and a rod (3) that has strength and length and is not expandable or difficult to contract (
4) is attached in one direction toward the surface of the lens in each ring shape so that the direction with respect to the lens can be freely adjusted. , annular bodies (5), (6) having a diameter larger than the lens (1) by a predetermined size.
A rod (3) attached to each annular body and connected to the inner surface of
The annular body (6) whose directions are the same as those of
), and the annular body (5) in which the direction of the rod attached to each annular body is opposite to the front is not rotated in the opposite direction (7) to the front, and each annular body By rotating left and right, the rods (3) and (4) move through the annular bodies (5 and 6),
The focus of the lens is changed by uniformly expanding and contracting the outer periphery of the variable lens (10), (13).

The eleventh invention is shown in FIG. 4, and includes a rotating annular body (14)
(15) (16) is 3 or more, and the left and right rotating annular bodies are alternately geared (19) (20) (21) (22)
The outer periphery of the lens (1) is expanded and contracted by rotating the shaft (25) of the lens (25) or by alternately rotating a predetermined annular body using a suitable lever or the like, thereby changing the focal point of the lens. be.

A third invention is shown in FIG. 5, in which two or more rotating annular bodies (23) (22), among the left and right rotating annular bodies,
Either (22) is fixed, and the rotation method is similar to that described above.

The fourth invention is shown in FIG. 10, and is transparent;
Or a synthetic lens (37) molded from a transparent material with a desired light color.
This is because a suitable liquid (36) is inserted into a container (35) whose front outer surface is approximately lens-shaped, and the effect is the same as described above.

The lens according to the present invention has a feature that it can be widely used in things with the name oO mirror, such as magnifying glasses, ordinary glasses, and telescopes.

[Brief explanation of drawings]

Figure 1. Fig. 2 Fig. 2 Fig. 3, Fig. 4. Figure 5. Figure 6. Figure 10. are the constituent countries of this invention, and each A is a front view. Each B is a central sectional view. Figure 8. Figure 9. is a front single-piece view. Figure 7. is a structural cross-sectional view of the outer periphery of the synthetic lens.

Claims (1)

[Claims] 1. At least two ring-shaped (
Rods having a desired cross-sectional shape, strength and length in two rows, and which are not expandable or difficult to contract, are connected in one direction toward the surface of the lens in each ring shape so that the rods can be freely oriented with respect to the lens, Each tip of this rod is connected to the inner surface of an annular body having a predetermined width and a diameter larger than the lens by a predetermined dimension so that each ring shape can be freely oriented, and the rods connected to each annular body are connected in the same direction. An annular body with a rod connected to each annular body is rotated in a predetermined direction, and an annular body whose rod connected to each annular body is in the opposite direction to the front is rotated in the opposite direction. A method for changing the focal point of a lens, characterized in that by rotating the body left and right, the rod uniformly expands and contracts the outer periphery of the variable lens through the annular body, thereby changing the focal point of the lens. 2. The number of rotating annular bodies in the first invention is three or more,
The first invention is characterized in that left and right rotating annular bodies are arranged alternately. 3. The first invention characterized in that in the two or more rotating annular bodies according to the first invention, one of the left and right rotating annular bodies is fixed. 4. The lens used in the first invention, characterized in that a suitable liquid is inserted into a lens-shaped container of suitable hardness, which is molded from a transparent material or a transparent material of a desired light color. 5. The fourth aspect of the invention is characterized in that the hardness or thickness of the lens surface of the lens-shaped container is set to a predetermined value at the lens surface position so that a desired lens shape is obtained with respect to expansion and contraction of the outer periphery. Fourth invention. 6. The above invention is characterized in that a ring body made of a stretchable material is formed around the outer periphery of the variable lens. 7. The first invention is made by bonding the surfaces of a plurality of single lenses each having one annular body having the above-mentioned rod on the outer periphery of a lens 1 having a suitably thin opening.