LTM 和 M mount 的专利问题？

lc7535

有看过一些零碎的文章说 L39 mount 二战后德国战败， 他们的专利被取消了，所以大家都可以生产。
二00几年M mount 也过了五十年，所以也专利期满，大家都可以不用付授权费就可以生产了。

有無师兄可以确定这个呢？

M3fans

If you really want to be sure, the best way is to ask a lawyer. The expense should be nothing for a business.
If just chatting, I guess that is yes.

頭文字L

Still not yet see a 6-bit coded third party M-mount lens in the market ?

borismach

LTM 同 M mount 早就没有专利啦。。你唔见Voigtlander 同 Hassel 都已经有不断0甘生产紧LTM 同 M mount 镜头。。仲有Ricoh呢。。。

kievnut

6 bit code個專利可能係由M8開始。咁製造M mount嘅Body cap又有冇抵觸專利？

lc7535

borismach 發表於 2014-2-15 20:09
LTM 同 M mount 早就没有专利啦。。你唔见Voigtlander 同 Hassel 都已经有不断0甘生产紧LTM 同 M mount 镜 ...

其他厂家的M mount 係200X 年先有？就係专利期满后。

lc7535

M3fans 發表於 2014-2-15 17:10
If you really want to be sure, the best way is to ask a lawyer. The expense should be nothing for a  ...

只係想揾chat 下咋

lc7535

頭文字L 發表於 2014-2-15 20:04
Still not yet see a 6-bit coded third party M-mount lens in the market ?

6 bit 应该係另外一个专利，所以只可以有M mount 但唔可以有6 bit

borismach

lc7535 發表於 2014-2-15 20:14
其他厂家的M mount 係200X 年先有？就係专利期满后。

应该系。。边年开始失效就唔记得啦。。印象中断0左V记马上就出M mount镜头、同埋果部Hexar面世咯。。。

kwanlok

IIRC, Cosina Voigtlander 開頭做機同鏡全部 LTM，就係 M Mount 個專利未過。一過左就全部做 M mount

bubu

lc7535 發表於 2014-2-15 20:16
6 bit 应该係另外一个专利，所以只可以有M mount 但唔可以有6 bit

6-bit coding is more than a copyright of production.
It's a proprietary system that enhances both ends, the lens and the camera, to work better together.

Unless Leica opens the system to other lens manufacturers and include such lenses' info and optimization in their cameras' built-in software, a code on the lens mount is meaningless.

Then the question is simple, why would Leica open it?

Correct me if I am wrong.

頭文字L

bubu 發表於 2014-2-16 00:30
6-bit coding is more than a copyright of production.
It's a proprietary system that enhances both  ...

May be some of their leNs are not the best in class, invite some third party lens makers to join the party , so as to let leica users to have more choices ..... ?

ngkh

bubu 發表於 2014-2-16 00:30
6-bit coding is more than a copyright of production.
It's a proprietary system that enhances both  ...

x2... i think 6-bit coding involves patent and provides a physical signal for a Leica camera to recognise what the lens is.  More importantly, it is the lens profile in the camera that helps the optimisation between the lens and the camera.

I guess, usage of the 6 bit coding would cost royalty fee.  In a recent batch of R-to-M adaptor for M240 from a 3rd party, we can see "Under Licence from Leica Camera AG" printed on the adaptor, together with our familiar 6 bit-coding, whereas the 6-bit code shape of its initial batch (w/o "under licence from Leica Camera A/G" prints) is not what we are familiar with.

borismach

kwanlok 發表於 2014-2-15 23:46
IIRC, Cosina Voigtlander 開頭做機同鏡全部 LTM，就係 M Mount 個專利未過。一過左就全部做 M mount ...

Canon 同 Nikon 都系。。好早期已经出LTM相机同镜头。。。