JPS61126501A - Combined lens - Google Patents

Abstract

PURPOSE:To obtain a combined lens which is lightweight, low in cost, has high performance and is suitable for diversified applications in the combined lens combined with an inorg. optical element and org. optical element by constituting the lens in such a manner that said optical elements are fitted and fixed by a liquid adhesive layer and by the walled edge part of the inorg. optical element and the outside projecting rim of the org. optical element. CONSTITUTION:A slight amt. of liquid 7 is dropped by a syringe onto a meniscus-like plastic concave lens 3 of which the joint surface is faced upward. A glass lens 1 is placed thereon and is tightly adhered to the plastic lens via the liquid 7. The lenses are tightly adhered to some extent in this state as the walled edge 2 of the lens 1 and the outside projecting rim 4 of the lens 3 fit to each other. The fixing is made sure by dropping an adhesive agent 8 to the part where the walled edge 2 of the lens 1 and the outside projecting rim 4 of the lens 3 contact with each other. A refined paraffin oil, silicone oil, fluorosilicone oil, etc. which do not attack the lens 1 and the lens 3 are used for the liquid 7.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a cemented lens comprising an inorganic optical element and an organic optical element.

(Prior Art) A cemented lens is generally made by bonding two glass lenses together using an adhesive, but a) the weight increases because the two glass lenses are bonded together.

b) The cost is an additional K because of the processing and bonding of the two glass lenses.

There are drawbacks such as. However, due to optical performance requirements, its use was unavoidable.

Therefore, as shown in Japanese Patent Application Laid-Open No. 59-109326, it is possible to use a cemented lens made of synthetic resin lenses, which is more convenient because it is lighter in weight and cheaper than glass processing. It is.

However, as can be seen from the above-mentioned Japanese Unexamined Patent Publication No. 59-109326, the types of synthetic resin materials for lenses made of synthetic resin are limited, and the range of material selection is narrowed. However, they are not yet abundant enough to support glass cemented lenses.

There is a problem. Therefore, by replacing one of the cemented lenses with glass, a wide range of material problems can be addressed. However, there are still unresolved problems. In other words, d) Because the synthetic resin lens is deformed by the volumetric contraction that occurs during curing, the surface precision and wall thickness of the organic optical element are inversely proportional, and the wall thickness of the organic optical element must be drastically reduced to meet high precision requirements. Otherwise, we will not be able to respond (actually imm
(to the extent below) practical constraints occur.

In addition, to prevent deformation of the optical surface during bonding,
As described in Japanese Patent No. 46525, a method has been proposed in which the effective diameter portion is made of an uncured liquid adhesive, but this method has problems when the material of the optical element is inorganic. However, if it is an organic substance, there is one problem in that it will attack it.

(Objective) In view of the above points, the present invention provides a cemented optical element that combines an inorganic optical element and an organic optical element, which is lighter and lower in cost than conventional cemented lenses made of inorganic materials. Furthermore, K can provide a cemented lens that has higher performance than conventional cemented lenses made of organic materials and is suitable for a wide variety of uses.

(Summary) A liquid is dropped onto either an inorganic optical element or an organic optical element to be bonded, and the other optical element is brought into close contact with the other optical element to which no liquid has been dropped. At this time, the edge portion of the inorganic optical element and the outer edge protrusion of the organic optical element are closely fitted at the same time.
Fixed.

(Example) Hereinafter, the present invention will be described in detail based on the drawings.

FIG. 1 shows a biconvex glass lens 1 having a green flesh portion 2 on its circumference. FIG. 2 shows a meniscus-shaped plastic lens 3, with outer edge protrusions 4 around it.
have. Now, the glass lens 1 shown in FIG.
To make a cemented lens by joining the glass lens 3 and the glass lens 3 shown in FIG. 2 above, as shown in FIG.
A small amount of liquid 7 is dropped using the syringe 6.

Next, as shown in FIG. 4, the glass lens 1 is placed on the glass lens 3 and brought into close contact with the glass lens 3 via a liquid. Even in this state, the edge portion 2 of the glass lens 10 and the outer edge protrusion 4 of the plastic lens 3 are fitted to some extent, so that they are in close contact.

In order to further improve durability, as shown in FIG. 5, adhesive 8 is dripped onto the contact area between the edge portion 2 of the glass lens 1 and the outer edge protrusion 4 of the plastic lens 3 to ensure secure fixation. .

The liquid 7 may be purified paraffin oil, silicone oil, and 70 may be silicone oil, poly-α-olefin oil, Polyper 70 low ether oil, etc., depending on the type of plastic material or glass material. None of these liquids will attack the glass or plastic lenses used.

Furthermore, the above plastic lenses are often obtained by injection molding of transparent acrylic resin, polycarbonate resin, styrene resin, or the like.

In the above embodiment, a bonded lens was formed by dropping the liquid for adhesion onto the plastic lens side, but this may be applied to either one of the lenses forming the bonded lens. In addition, although a double-convex lens made of inorganic glass and a meniscus lens made of organic material were used, the shape of the lens is not limited to this, and a plastic lens made of WFIk material may have a protruding outer edge portion formed integrally with it. It is clear to those skilled in the art that a combination of lenses having the shapes of can be accommodated.

(By replacing one side of the cemented lens with an organic optical element having an outer edge protrusion, it is possible to significantly reduce weight and reduce costs compared to conventional cemented lenses made of inorganic glass lenses.) Can be lowered.

Additionally, compared to conventional cemented lenses made of organic plastic lenses, optical performance such as refractive index and Atsube's number is more diverse, making it possible to use the cemented lens system in a variety of applications. Furthermore, compared to a cemented lens of an inorganic glass lens and an organic glass lens obtained by a similar method, the wall thickness can be varied over a wide range, and a cemented lens with high precision and rigidity can be obtained. .

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an inorganic glass lens having an edge portion forming a cemented lens, Fig. 2 is a sectional view of an organic plastic lens having an outer edge protrusion forming a cemented lens, and Fig. 3 is a sectional view of an organic glass lens having an outer edge protrusion forming a cemented lens. , a line diagram showing the step of dropping liquid for bonding the lenses shown in FIGS. 1 and 2 above, FIG. 4 is a cross-sectional view showing the state in which the lenses are bonded, and FIG. FIG. 3 is a sectional view showing a state in which adhesive is further dropped and fixed around the cemented lens in the state shown in the figure. 1...Inorganic optical element 2...Edge portion 3 of the inorganic optical element...Organic optical element 4...Outer edge protrusion 7 of the organic optical element... liquid

Claims (2)

[Claims] (1) In a cemented lens that combines an inorganic optical element and an organic optical element, the bonding layer formed between the inorganic optical element and the organic optical element is liquid, and the edge of the inorganic optical element and the organic A cemented lens characterized by being fitted and fixed by an outer edge protrusion of an optical element. (2) The liquid in the bonding layer of the cemented lens is purified paraffin oil, silicone oil, fluorosilicone oil, poly-α-
The cemented lens according to claim 1, wherein the cemented lens is an olefin oil or a polyperfluoroether oil.