JPH03260602A - Method for changing focal point of lens - Google Patents

Abstract

PURPOSE:To make a focal point variable by arranging an elastic waveform band annular body and plural doughnutlike wedge plates on the periphery of a freely extensible double plate lens consisting of two single plate lenses and extending/contracting the double plate lens by rotating the wedge plates. CONSTITUTION:An airtight space is formed on the peripheries of two transparent and elastic single plate lenses to form a freely extensible double plate lens 1. The elastic waveform band annular body 3 consisting of an elastic material is arranged on the periphery of the lens 1 and two doughnut type wedge plates 4, 5 are rotatably arranged on the periphery of the body 3 so that the wedge directions are mutually reversed. The periphery of the lens 1 is extended/ contracted in the inner or outer direction by rotating the edge plates 4, 5 mutually in the reverse directions to change the focal point of the lens 1. When the wedge plates 4, 5 are most narrowed, a concave lens is formed, and when the plates 4, 5 are sufficiently opened, a convex lens is formed.

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.

(Problems to be Solved by the Invention) Conventionally, optical lenses have been molded from glass, and the focal point is always constant, and the only way to change this is 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) By applying pressure, including negative pressure, from the outer periphery of the free lens toward the inside of the lens, the lens becomes a concave-convex lens, and its focal point becomes free.

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

FIG. 1 is a standard structural diagram of a variable focus lens according to the present invention, in which A is a schematic plan view, B, to G,
is this central sectional view.

In the figure, a plurality of band annular bodies made of a suitable band-shaped elastic material and having the same waveform are attached directly or indirectly to the outer periphery of a free-form lens (1), and the tops of the waveforms (26) are hardened. , or a structure with low surface frictional resistance, and the outer periphery is
The same number of inner wedges (27) (28
) are provided with a plurality of donut-shaped inner wedge plates (4) that can be freely rotated by a small amount while alternating the directions of the wedges. When rotated in the direction of the wedge or in the opposite direction, each wedge pushes the corrugated peak (26) toward the center of the circle, or
Or, conversely, by moving away and compressing the outer periphery of the lens toward the center of the circle of the corrugated annular body (3) or opening it outward, the focal point of the lens at the center can be changed. be.

FIG. 1A shows a state in which the wedge position of the donut-shaped inner wedge plate (4) is at its narrowest position and the lens (1) is most enlarged, forming a concave lens.

Same, B, the wedge of the donut-shaped inner wedge plate (4),
The lens is in good condition and has no prescription.

C1 has a sufficiently wedged shape and is in the state of a convex lens.

E, F, and G each have a transparent liquid (30) inserted into a lens of a suitable transparent container (29) to produce a concave-convex lens effect.

Figure 2 shows the reduction of the compression ring (18)! Through (22), reduce and expand the arrow (23) and ring (18),
The lens (1) is contracted and expanded from its outer periphery via the rod (20), thereby generating the unevenness phenomenon of the free lens.

Figure 3 shows that the arrow (23) and the ring (18) are compressed and expanded through the compression ring (24) reduction device W (22), and the lens (1) is attached to a long tangent or a suitable circumferential ring. (25) is used to compress or expand the lens to produce a lens effect.

The lens according to the present invention has a feature that it can be widely used in things with names such as magnifying glasses, ordinary glasses, and telescopes, which have names such as oo mirrors.

[Brief explanation of drawings]

Figure 1. is a configuration diagram related to this invention, in which each A,
is a front view. B, to G, are central sectional views. Figures 2 and 3 are front unit views.

Claims (1)

[Claims] 1. Pressure, including negative pressure, is applied inward from a plurality of predetermined positions on the outer periphery of a free-form lens to change the shape of the lens, that is, change the lens focus. Featured method of changing the focus of the lens. 2. The first invention is characterized in that a free-form lens, in which a suitable liquid is inserted into a lens-shaped container having a suitable hardness and which is molded from a transparent material or a transparent material having a desired light color, is used in the first invention.
, invention of. 3. The first invention is characterized in that a suitable elastically extensible ring body is attached to the outer periphery of the free lens. 4. Directly or indirectly attach to the outer periphery of the free-form lens a plurality of band annular bodies with the same waveform made of a suitable band-shaped elastic material, and the tops of these waveforms are hardened or have a surface with low frictional resistance. On its outer periphery, a plurality of donut-shaped inner wedge plates forming the same number of inner wedges as the number of peaks of the corrugated peaks are installed so that they can be rotated by a small amount while alternating the direction of the wedges. When the plates are rotated in the wedge direction or in the opposite direction using a lever or gear,
Each wedge pushes the corrugated peak toward the center or moves away, and on the center side of the corrugated band annular body, compresses the outer circumference of the lens toward the center or opens it outward. , a method of changing the focus of a lens, characterized by changing the focus of a central lens. 5. The fourth invention according to the fourth invention, characterized in that there are three or more donut-shaped internal wedge plates, and the directions of the internal wedges are arranged alternately. 6. The fourth invention, characterized in that the two or more donut-shaped internal wedge plates according to the fourth invention are fixed in one of the left and right wedge directions. 7. The hardness or thickness of the lens surface of the lens-shaped container in the above invention is set to a predetermined value at the lens surface position so that the desired lens shape is obtained with respect to expansion and contraction of the outer periphery. 2. Invention.