Interesting Fujifilm View Finder Patent Found


A reader sent me an interesting patent that I did my best to translate. It looks like Fujifilm is working on making a more compact higher magnification viewfinder that works with LCD’s.  It was filed last month so it will probably be a while until we see it in a production product, but you can read more about it below if you like to read translated patents.

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From Translated Patent:
The present invention relates to a finder optical system and an imaging apparatus.

An eyepiece optical system is mounted on a viewfinder of an optical device such as a digital camera. Traditional
As an eyepiece optical system, for example, an optical system described in Patent Document 1 below is known. Patent Literature
The eyepiece optical system according to No. 1 can be used for telescopes and binoculars, and includes a diffractive optical element.
It is configured using. In addition, an eyepiece optical system configured using a diffractive optical element and
Therefore, optical systems described in Patent Document 2 and Patent Document 3 below are known. Patent Document 2
The eyepiece optical system described in (1) can be used for binoculars, telescopes, and microscopes.

An eyepiece optical system is mounted on a viewfinder of an optical device such as a digital camera. Traditional
As an eyepiece optical system, for example, an optical system described in Patent Document 1 below is known. Patent Literature
The eyepiece optical system according to No. 1 can be used for telescopes and binoculars, and includes a diffractive optical element.
It is configured using. In addition, an eyepiece optical system configured using a diffractive optical element and
Therefore, optical systems described in Patent Document 2 and Patent Document 3 below are known. Patent Document 2
The eyepiece optical system described in (1) can be used for binoculars, telescopes, and microscopes.

In recent years, electronic viewfinders (Elect.
Rical view finder) is often used. Electronic viewfinder
Is a display element such as a liquid crystal panel for displaying an image of the subject, and an image displayed on the display element.
An eyepiece optical system is provided.

However, the degree of freedom in the configuration of the display element and the eyepiece optical system in the electronic viewfinder is extremely high.
Very low. When trying to improve the viewfinder magnification, that is, to widen the viewing angle,
The number of lenses constituting the eyepiece optical system increases, making it difficult to reduce the size of the viewfinder unit.
The If you try to improve the specifications without increasing the number of lenses,
It becomes difficult to correct various aberrations of the optical system.

In terms of correction of various aberrations, the eyepiece optical systems described in Patent Document 1 and Patent Document 2 are both
Correction of astigmatism and distortion has been achieved to the extent required in recent years
It’s hard to say. The eyepiece optical system described in Patent Document 3 also has spherical aberration, astigmatism, and distortion.
It is difficult to say that aberration correction has been sufficiently achieved to the extent required in recent years.

In view of the above circumstances, the present invention can be suitably used for an electronic viewfinder and the like.
Various aberrations are corrected satisfactorily while reducing the angle of view, and the viewfinder unit is downsized.
Finder optical system that can be used, and imaging device equipped with the finder optical system
The purpose is to do.

Patent

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