Cemented lens

Abstract

The invention discloses a cemented lens, which contributes to avoiding optical performance deterioration and the like caused by stripping of an adhesive. The cemented lens comprises a first lens and asecond lens, which are made of plastic and are cemented by using the adhesive, wherein the refractive indexes of the first lens, the second lens and the adhesive are greater than or equal to 1.4 andsmaller than or equal to 1.7; the area, cemented with the second lens, of the first lens comprises a concave lens plane and a first lens side periphery region; the area, cemented with the first lens,of the second lens comprises a convex lens plane and a second lens side periphery region; and a single transparent material layer formed by the materials selected from SiO2, BaF2, S4F, S5F, YF3, LaF3,CeF3, NdF3, Al2O3 and OM<-4> is deposited in the area, cemented with the second lens, of the first lens and the area, cemented with the first lens, of the second lens.

Description

technical field [0001] The present invention relates to a cemented lens, and more particularly to a cemented lens having a plastic first lens and a plastic second lens bonded with an adhesive. Background technique [0002] In the past, there was a cemented lens such as Figure 4 As shown, it has a plastic first lens 14X and a plastic second lens 15X bonded by an adhesive PTX. [0003] Specifically, as Figure 4 As shown, the area of ​​the first lens 14X that is bonded to the second lens 15X includes a concave lens surface 141X and a first lens side peripheral area 142X that surrounds the concave lens surface 141X on the outer peripheral side. The second lens 15X is connected to the first lens 14X. The bonded region includes a convex lens surface 151X facing the concave lens surface 141X and a second lens side peripheral region 152X surrounding the convex lens surface 151X on the peripheral side, and in order to avoid the first lens 14X and the second lens 15X The distance b...

AI Technical Summary

Problems solved by technology

[0005] However, in the manufacturing process of the above-mentioned cemented lens, when the adhesive is cured by ultraviolet light passing through the lens, contraction force will be generated in the adhesive, and when the adhesive is bonded to the first lens and the second lens, When the bonding strength between the surfaces of the first lens and the second lens is not enough to resist the above-mentioned contraction force, the adhesive will peel off from the surfaces that need to be bonded to each other of the first lens and the second lens. Surfaces that need to be bonded to each other create a thin air layer that can cause problems such as lens failure or poor optical performance

[0006] In particular, since the adhesive strength between the adhesive and plastic is weaker than the adhesive strength between the adhesive and metal or glass, the above-mentioned cemented lens is prone to problems such as lens failure or poor optical performance.

[0007] In addition, in practice, due to factors such as storage conditions, the surfaces of the first lens and the second lens before bonding may sometimes have problems such as oxidation or deterioration of weather resistance, resulting in the uncured adhesive bonding with the first lens, the second lens, etc. The affinity between the surfaces of the second lens becomes poor, and the adhesive is not easy to adhere to the surfaces of the first lens and the second lens. In this case, lens failure or optical performance may also occur when the above-mentioned cemented lens is manufactured. Variation and other issues

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