Variable-magnification observation optical system
US-9869850-B2 · Jan 16, 2018 · US
Observation optical system
US10514536B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10514536-B2 |
| Application number | US-201715617664-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 8, 2017 |
| Priority date | Jun 8, 2016 |
| Publication date | Dec 24, 2019 |
| Grant date | Dec 24, 2019 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
An observation optical system of a real-image type includes, in order from the object side, an objective system, a reverse-erecting system that erects an inverted image formed by the objective system, and an eyepiece system that allows a pupil to observe an erect image formed by the reverse-erecting system. The objective system includes, in order from the object side, a first lens having a negative power and a second lens having a positive power. The eyepiece system includes, in the order from the object side, a third lens having a positive power, a fourth lens having a negative power, a fifth lens having a positive power, and a sixth lens having a positive power.
First claim
Opening claim text (preview).
The invention claimed is: 1. An observation optical system of a real-image type, comprising, in order from an object side: an objective system; a reverse-erecting system that erects an inverted image formed by the objective system; and an eyepiece system that allows a pupil to observe an erect image formed by the reverse-erecting system, wherein the objective system has exactly two lenses, a first lens having a negative refractive power and a second lens having a positive refractive power, disposed in that order from the object side, wherein the eyepiece system comprises, in order from the object side, a third lens having a positive refractive power, a fourth lens having a negative refractive power, a fifth lens having a positive refractive power, and a sixth lens having a positive refractive power, and wherein each of the third and fourth lenses adjacent to each other in the eyepiece system has a concave surface at the object side. 2. The observation optical system according to claim 1 , wherein the objective system is a cemented lens having the first lens and the second lens joined together. 3. The observation optical system according to claim 1 , wherein the eyepiece system has a lens at least one side of which is aspherical. 4. The observation optical system according to claim 1 , wherein the observation optical system further comprises a parallel flat plate disposed between the eyepiece system and the pupil, the parallel flat plate comprising two flat surfaces parallel to one another.
Assignees
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Classifications
having a beam-folding prism or mirror · CPC title
Objectives · CPC title
Image-producing devices, e.g. surgical cameras · CPC title
- G02B25/007Primary
comprising other optical elements than lenses (G02B25/004, G02B25/005 take precedence) · CPC title
comprising two or more lenses (G02B25/004 - G02B25/007 take precedence) · CPC title
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- What does patent US10514536B2 cover?
- An observation optical system of a real-image type includes, in order from the object side, an objective system, a reverse-erecting system that erects an inverted image formed by the objective system, and an eyepiece system that allows a pupil to observe an erect image formed by the reverse-erecting system. The objective system includes, in order from the object side, a first lens having a nega…
- Who is the assignee on this patent?
- Konica Minolta Inc
- What technology area does this patent fall under?
- Primary CPC classification G02B25/007. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Dec 24 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).