Our website is made possible by displaying online advertisements to our visitors.
Please consider supporting us by disabling your ad blocker.
Canon patent application: New type of lens element bonding | Canon News
× Search


Canon patent application: New type of lens element bonding
/ Categories: Canon Patents
This post may contain affiliate links(s). An affiliate link means I may earn advertising/referral fees if you make a purchase through my link, without any additional cost to you. It helps to keep this site afloat. Thank you in advance for your support. If you like what we do here, maybe buy me a coffee.

Canon patent application: New type of lens element bonding

There is a lot of things that go into building a lens that you never will see, but cause the designers no end in worry and effort.

An example is this patent, one in which we'll never know if it gets implemented, but is a problem that Canon wants to resolve.

The problem specified here is that when two elements are bonded together, they may deform, and change their optical characteristics depending on temperature, also over time the elements may peel, or crack the along the joint. So they use a flexible adhesive, but then during thermal expansion, the shape of the element may occur, and change the optical properties, so that's not perfect either.  In this patent application, the adhesive allows for the thermal contraction/expansion to occur without changing the overall shape of the element.

As Canon states;

If the optical element using a significantly different optical element linear expansion coefficient, even align the linear expansion coefficient of the optical elements sandwiching as specified in Patent Document 2, deformation of the optical element, the optical Peeling easily occurs at the interface between elements.

In order to solve the peeling at this interface, for example, after molding a thermosetting or photo-curing resin material into an optical element, it is known that the adhesive layer formed with an adhesive is bonded to the other optical element to suppress deformation. It has been. The adhesive layer whose elastic modulus is greatly lowered when the temperature is increased can satisfactorily prevent peeling at the interface between two different optical elements. However, an optical element using such an adhesive layer may have a large change in surface shape when the temperature is raised and then returned to the original temperature, which may reduce optical performance. 

Japan Patent Application 2019-133138

Previous Article G7X Mark III sample pictures
Next Article Canon Patent Application: Expanded Sensor Dynamic Range using DPAF sensors
blog comments powered by Disqus

Theme picker

Keep In Touch


Our Preferred Sponsors

Want to buy me a coffee?

Free Shipping to the USA and Canada*

Use CANONNEWS for $10 off AuroraHDR

Use CANONNEWS for $10 off Luminar

*Conditions may apply
Terms Of UsePrivacy Statement© 2019 by CanonNews. This site is not affiliated with Canon Inc. or it's subsidiaries.
Back To Top