Camera having image pick-up device
AssigneeOlympus Optical Co., Ltd.
InventorYuji Imai
Life of this patent
Estimating the term…
Abstract
A camera includes a finder for enabling an image which is shot on a film to be monitor-displayed by branching a portion of a light beam (image) imaged by a picture-taking lens system, by an up/down movable pellicle mirror comprised of a half mirror, to let the image be received on a image pick-up device. In this camera, a pupil-dividing LCD is arranged in front of the image pick-up device to impart a phase difference to the light beam imaged by the picture-taking lens system to obtain corresponding image data. By doing so, phase difference AF control is carried out. The image pick-up device has both the function of monitoring a pick-up image and the function of detecting a just-in-focus state.
Claims24
A camera capable of forming a subject image onto a film with a light exposure and having an image pick-up device for picking up the subject image, said camera comprising:
- a picture-taking optical system for forming the subject image onto a film surface;
- a reflection mirror for reflecting at least a portion of a light beam passing through the picture-taking optical system;
- a re-imaging optical system for allowing the light beam which is reflected on the reflection mirror to be re-imaged on a light receiving area of the image pick-up device;
- a liquid crystal shutter provided between the re-imaging optical system and the image pick-up device to allow the light beam which passes through the re-imaging optical system to be pupil-divided, the liquid crystal shutter having a first transmission state in which a light beam of a first area of the re-imaging optical system is transmitted and a second transmission state in which a light beam of a second area of the re-imaging optical system different from the first area is transmitted;
- a liquid crystal control circuit for setting the liquid crystal shutter to the first transmission state and the second transmission state at different timings;
- and
- an electric circuit for outputting a signal relating to a focus state of the picture-taking optical system by a phase difference system based on an output of the image pick-up device in the first transmission state and an output of the image pick-up device in the second transmission state.
A camera capable of forming a subject image onto a film with a light exposure and having an image pick-up device for picking up the subject image, said camera comprising:
- a picture-taking optical system for forming the subject image onto a film surface;
- a reflection mirror for reflecting at least a portion of a subject light beam passing through the picture-taking optical system;
- a re-imaging optical system for allowing the subject light beam portion which is reflected on the reflection mirror to be re-imaged onto a light receiving area of the image pick-up device;
- a liquid crystal shutter provided between the re-imaging optical system and the image pick-up device to allow the subject light beam which passes through the re-imaging optical system to be pupil-divided;
- and
- an electric circuit for outputting a signal relating to a focus state of the picture-taking optical system by a phase difference system based on an output of a light receiving area of the image pick-up device at which the subject light beam divided by the liquid crystal shutter is re-imaged.
A camera comprising:
- a picture-taking optical system for forming a subject image on a film surface;
- image pick-up means having a light receiving element area provided for obtaining image data corresponding to the subject image;
- an-image pick-up optical system for guiding a portion of a light beam of the picture-taking optical system to the image pick-up means;
- pupil-dividing means provided in the image pick-up optical system;
- just-in-focus state detecting means for detecting a just-in-focus state of the picture-taking optical system based on an output of the image pick-up means at a time when a light beam divided by the pupil-dividing means is received on the light receiving element area;
- and
- display means for displaying the subject image based on the image data obtained from the image pick-up means.
A camera comprising:
- a picture-taking optical system for forming a subject image on a film surface;
- image pick-up means having a light receiving element area provided for obtaining image data corresponding to the subject image;
- an image pick-up optical system for guiding a portion of a light beam of the picture-taking optical system to the image pick-up means;
- pupil-dividing means provided in the image pick-up optical system;
- and
- just-in-focus state detecting means for detecting a just-in-focus state of the picture-taking optical system based on an output of the image pick-up means at a time when a light beam divided by the pupil-dividing means is received on the light receiving element area;
- wherein the pupil-dividing means comprises mask means for selectively setting a portion of a light beam of the image pick-up optical system to a light transmissive state or a light shielding state.
A camera having a picture-taking mechanism for forming a subject image which is imaged by a picture-taking optical system onto a film surface with a light exposure and display means for receiving the subject image on an image pick-up means and for sequentially displaying subject images on an image monitor based on outputs of the image pick-up means, wherein just-in-focus detection means is provided for detecting a just-in-focus state of the image pick-up optical state based on the outputs of the image pick-up means, and wherein the display means inhibits the subject images from being sequentially displayed on the image monitor during an operation of the just-in focus state detecting means and displays the subject image based on image data obtained before the operation of the just-in-focus detecting means.
A camera comprising:
- a picture-taking optical system forming a subject image onto a film surface;
- image pick-up means having a light receiving element area provided for receiving the subject image so as to obtain image data corresponding to the subject image;
- memory means for sequentially storing the image data;
- an image monitor for sequentially displaying subject images based on the image data stored in the memory means;
- an image pick-up optical system for guiding a portion of a light beam of the picture-taking optical system to the image pick-up means;
- pupil-dividing means provided in the image pick-up optical system;
- just-in-focus state detection means for detecting a just-in-focus state of the picture-taking optical system based on an output of the image pick-up means at a time when the light beam divided by the pupil-dividing means is received on the light receiving element area;
- and
- image monitor display latch means for inhibiting the subject images from being sequentially displayed on the image monitor during an operation of the just-in-focus state detection means and displaying the subject image based on the image data obtained from the operation of the just-in-focus state detection means.
A camera having a picture-taking optical system for forming a subject image onto a film surface and an electronic view finder device for monitoring the subject image with the use of a portion of a picture-taking light beam of the picture-taking optical system, said camera comprising:
- pupil-dividing means provided within the electronic view finder device;
- and
- an image pick-up device provided within the electronic view finder and arranged behind the pupil-dividing means,
- wherein the image pick-up device has both a function of monitoring the subject image and a function of detecting a just in-focus state of the image-taking optical system.
A camera comprising:
- an image-taking optical system for forming a subject image onto a film surface;
- an image pick-up means having a light receiving element area provided for obtaining image data corresponding to the subject image;
- an image pick-up optical system for guiding a portion of a light beam of the image-taking optical system to the image pick-up means;
- pupil-dividing means provided in the image-taking optical system;
- and
- just-in-focus state detecting means for detecting a just-in-focus state of the image-taking optical system based on an output of the image pick-up means at a time when a light beam divided by the pupil-dividing means is received by the light receiving element area;
- wherein the pupil-dividing means comprises mask means for setting a portion of a light beam of the image pick-up optical system selectively to a light transmissive state or a light shielding state.
A camera comprising:
- an image-taking optical system for forming a subject image onto a film surface;
- an image pick-up means having a light receiving element area provided for obtaining image data corresponding to the subject image;
- an image pick-up optical system for guiding a portion of a light beam of the image-taking optical system to the image pick-up means;
- pupil-dividing means provided in the image-taking optical system;
- and
- just-in-focus state detecting means for detecting a just-in-focus state of the image-taking optical system based on an output of the image pick-up means at a time when a light beam divided by the pupil-dividing means is received by the light receiving element area;
- wherein the pupil-dividing means comprises a fly eye lens.
A camera comprising:
- a picture-taking optical system for forming a subject image onto a film surface;
- image pick-up means having a light receiving element area provided for receiving the subject image so as to obtain image data corresponding to the subject image;
- memory means for sequentially storing the image data;
- an image monitor for sequentially displaying subject images based on the image data stored in the memory means;
- an image pick-up optical system for guiding a portion of a light beam of the picture-taking optical system to the image pick-up means;
- pupil-dividing means provided in the image pick-up optical system;
- just-in-focus state detection means for detecting a just-in-focus state of the picture-taking optical system based on an output of the image pick-up means at a time when the light beam divided by the pupil-divided means is received on the light receiving element area;
- and
- image monitor display latch means for inhibiting the subject images from being sequentially displayed on the image monitor during an operation of the just-in-focus state detection means.
A camera comprising:
- a picture-taking optical system for forming a subject image on a film surface;
- image pick-up means having a light receiving element area provided for receiving the subject image so as to obtain image data corresponding to the subject image;
- memory means for storing the image data;
- an image monitor for displaying the subject image based on the image data stored in the memory means;
- display repetition performing means for repetitively performing display of the subject image on the image monitor;
- image pick-up optical system for guiding a portion of a light beam of the picture-taking optical system to the image pick-up means;
- pupil-dividing means provided in the image pick-up optical system;
- just-in-focus state detection means for detecting a just-in-focus state of the picture-taking optical system based on an output of the image pick-up means at a time when a light beam divided by the pupil-dividing means is received on the light receiving element area;
- and
- image monitor display latch means for displaying the subject image based on the image data obtained during operation of the display repetition performing means at a time when the just-in-focus state detection means is operated during the operation of the display repetition performing means.
Dependencies are inferred from the claim text.