Image pickup system
AssigneeOlympus Corporation
InventorsYuji Miyauchi, Hirohiko Kimata
Life of this patent
Estimating the term…
Abstract
The invention relates to an image pickup system comprising an electronic view finder suitable for achieving compactness and having a sufficient viewing angle of field and satisfactory optical performance. The image pickup system comprises an image pickup device, an image display device for displaying an image, a controller for converting image formation obtained from the image pickup device into a signal that enables the image information to be formed on the image display device, and a viewing optical system for guiding an image displayed on the display device to a viewer's eye. The viewing optical system comprises at least three lenses.
Claims33
An image pickup system, comprising an image pickup device, an image display device including a display screen for displaying an image, a controller for converting image information obtained from said image pickup device into a signal that enables said image information to be formed on said image display device, and a viewing optical system for guiding an image displayed on said display device to a viewer's eye, wherein said viewing optical system comprising, in order from said image display device, a bi-convex positive lens element, a positive lens element and a negative lens element, wherein the second-mentioned positive lens element and said negative lens element are cemented together.
An image pickup system, comprising an image pickup device, an image display device including a display screen for displaying an image, a controller for converting image information obtained from said image pickup device into a signal that enables said image information to be formed on said image display device, and a viewing optical system for guiding an image displayed on said display device to a viewer's eye, wherein said viewing optical system comprises at least three lens elements, at least two of which are cemented together to form a doublet component, wherein the doublet component has, in order from the image display device side, a positive lens having a concave surface to the viewer's eye side and a negative lens having a concave surface to the image display device side, and wherein the image pickup system satisfies the following condition (2):
- 1.0<a/c (2)
- where a is a distance from the display screen of said image display device to the surface, nearest to the image display device side, of said viewing optical system, and c is a length of a short side of the display screen of said image display device.
An image pickup system comprising an image pickup device, an image display device including a display screen for displaying an image, a controller for converting image information obtained from said image pickup device into a signal that enables said image information to be formed on said image display device, and a viewing optical system for guiding an image displayed on said display device to a viewer's eye, wherein:
- said viewing optical system, comprises, in order from said image display device side, a positive lens element, a positive lens element and a negative lens element, wherein the second-mentioned positive lens element and said negative lens element are cemented together, and the following conditions (1) and (3) are satisfied:
- 1.0<b/a (1)
- 1.4<fe/a<2.4 (3)
- where a is a distance from the display screen of said image display device to the surface, nearest to the image display device side, of said viewing optical system, b is a total length from the surface, axially nearest to the image display device side, of said viewing optical system to the surface thereof nearest to the viewer side, and fe is a focal length of said viewing optical system.
An image pickup system comprising an image pickup device, an image display device including a display screen for displaying an image, a controller for converting image information obtained from said image pickup device into a signal that enables said image information to be formed on said image display device, and a viewing optical system for guiding an image displayed on said display device to a viewer's eye, wherein said viewing optical system comprises a plurality of at least three lens components in which all surfaces thereof;
- in contact with air, are convex on an air side, and wherein the following conditions (1) and (3) are satisfied:
- 1.0<b/a (1)
- 1.4<fe/a<2.4 (3)
- where a is a distance from the display screen of said image display device to the surface, nearest to the image display device side, of said viewing optical system, b is a total length from the surface, axially nearest to the image display device side, of said viewing optical system to the surface thereof nearest to the viewer side, and fe is a focal length of said viewing optical system.
An image pickup system comprising an image pickup device, an image display device including a display screen for displaying an image, a controller for converting image information obtained from said image pickup device into a signal that enables said image information to be formed on said image display device, and a viewing optical system for guiding an image displayed on said display device to a viewer's eye, wherein:
- said viewing optical system comprises, in order from the image display device side, a double-convex positive lens element, a negative meniscus lens element concave on said image display device side and a positive lens element, wherein the number of lens elements having positive or negative refracting power in said viewing optical system is 3, and
- the following conditions (1) and (3) are satisfied:
- 1.0<b/a (1)
- 1.4<fe/a<2.4 (3)
- where a is a distance from the display screen of said image display device to the surface, nearest to the image display device side, of said viewing optical system, b is a total length from the surface, axially nearest to the image display device side, of said viewing optical system to the surface thereof nearest to the viewer side, and fe is a focal length of said viewing optical system.
An image pickup system comprising an image pickup device, an image display device including a display screen for displaying an image, a controller for converting image information obtained from said image pickup device into a signal that enables said image information to be formed on said image display device, and a viewing optical system for guiding an image displayed on said display device to a viewer's eye, wherein:
- said viewing optical system comprises, in order from the image display device side, a double-convex positive lens element, a negative meniscus lens element, wherein the number of lens elements having positive or negative refracting power in said viewing optical system is 3, and
- the following conditions (1) and (3) are satisfied:
- 1.0<b/a (1)
- 1.4<fe/a<2.4 (3)
- where a is a distance from the display screen of said image display device to the surface, nearest to the image display device side, of said viewing optical system, b is a total length from the surface, axially nearest to the image display device side, of said viewing optical system to the surface thereof nearest to the viewer side, and fe is a focal length of said viewing optical system;
- and
- wherein said double-convex positive element has an absolute value of a radius of curvature smaller at a surface opposite to said image display device than at a surface opposite to a viewer side.
An image pickup system, comprising an image pickup device, an image display device including a display screen for displaying an image, a controller for converting image information obtained from said image pickup device into a signal that enables said image information to be formed on said image display device, and a viewing optical system for guiding an image displayed on said display device to a viewers eye, wherein said viewing optical system comprises at least three lens elements, at least two of which are cemented together to form a doublet component, wherein the image pickup system satisfies the following condition (2):
- 1.0<a/c (2)
- where a is a distance from the display screen of said image display device to the surface, nearest to the image display device side, of said viewing optical system, and c is a length of a short side of the display screen of said image display, and wherein said viewing optical system consists of two lens components or a doublet component composed of one negative lens element and one positive lens element and one single-lens component whose absolute value for refracting power is smaller than either one of the absolute value for refracting power of said positive lens element and the absolute value for refracting power of said negative lens element.
An image pickup system, comprising an image pickup device, an image display device including a display screen for displaying an image, a controller for converting image information obtained from said image pickup device into a signal that enables said image information to be formed on said image display device, and a viewing optical system for guiding an image displayed on said display device to a viewers eye, wherein said viewing optical system comprises at least three lens elements, at least two of which are cemented together to form a doublet component, wherein the image pickup system satisfies the following condition (2):
- 1.0<a/c (2)
- where a is a distance from the display screen of said image display device to the surface, nearest to the image display device side, of said viewing optical system, and c is a length of a short side of the display screen of said image display device, and wherein said viewing optical system consists of three lens elements or, in order from said image display device side, a positive lens element, a negative lens element and a positive lens element, while the first-mentioned positive lens element is cemented together with said negative lens element.
An image pickup system, comprising an image pickup device, an image display device including a display screen for displaying an image, a controller for converting image information obtained from said image pickup device into a signal that enables said image information to be formed on said image display device, and a viewing optical system for guiding an image displayed on said display device to a viewer's eye, wherein said viewing optical system comprising, in order from said image display device side, a positive lens element, a positive lens element and a negative lens element, wherein the second-mentioned positive lens element and said negative lens element are cemented together, and wherein said image pickup system satisfies the following condition (1):
- 1.0<b/a (1)
- where a is a distance from the display screen of said image display device to the surface, nearest to the image display device side, of said viewing optical system, and b is a total length from the surface, axially nearest to the image display device side, of said viewing optical system to the surface thereof nearest to the viewer side.
An image pickup system, comprising an image pickup device, an image display device including a display screen for displaying an image, a controller for converting image information obtained from said image pickup device into a signal that enables said image information to be formed on said image display device, and a viewing optical system for guiding an image displayed on said display device to a viewer's eye, wherein said viewing optical system comprising, in order from said image display device side, a positive lens element, a positive lens element and a negative lens element, wherein the second-mentioned positive lens element and said negative lens element are cemented together, and wherein said image pickup system satisfies the following condition (3):
- 1.4<fe/a<2.4 (3)
- where a is a distance from the display screen of said image display device to the surface, nearest to the image display device side, of said viewing optical system, and fe is a focal length of said viewing optical system.
An image pickup system, comprising an image pickup device, an image display device including a display screen for displaying an image, a controller for converting image information obtained from said image pickup device into a signal that enables said image information to be formed on said image display device, and a viewing optical system for guiding an image displayed on said display device to a viewer's eye, wherein said viewing optical system comprises at least three lens elements, at least two of which are cemented together to form a doublet component, wherein the image pickup system satisfies the following condition (2):
- 1.0<a/c (2)
- where a is a distance from the display screen of said image display device to the surface, nearest to the image display device side, of said viewing optical system, and c is a length of a short side of the display screen of said image display device, and wherein said image pickup system satisfies the following condition (3):
- 1.4<fe/a<2.4 (3)
- where a is a distance from the display screen of said image display device to the surface, nearest to the image display device side, of said viewing optical system, and fe is a focal length of said viewing optical system.
An image pickup system, comprising an image pickup device, an image display device including a display screen for displaying an image, a controller for converting image information obtained from said image pickup device into a signal that enables said image information to be formed on said image display device, and a viewing optical system for guiding an image displayed on said display device to a viewer's eye, wherein said viewing optical system comprises at least three lens elements, at least two of which are cemented together to form a doublet component, wherein the image pickup system satisfies the following condition (2):
- 1.0<a/c (2)
- where a is a distance from the display screen of said image display device to the surface, nearest to the image display device side, of said viewing optical system, and c is a length of a short side of the display screen of said image display device and wherein said image display device is a reflection type image display device for displaying an image by illumination from a display screen side thereof, and comprises an illumination member for illuminating the display screen of said reflection type image display device.
Dependencies are inferred from the claim text.