JP2003250080A - Imaging apparatus and imaging system - Google Patents

Imaging apparatus and imaging system

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Publication number
JP2003250080A
JP2003250080A JP2002045556A JP2002045556A JP2003250080A JP 2003250080 A JP2003250080 A JP 2003250080A JP 2002045556 A JP2002045556 A JP 2002045556A JP 2002045556 A JP2002045556 A JP 2002045556A JP 2003250080 A JP2003250080 A JP 2003250080A
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JP
Japan
Prior art keywords
pixel
image
imaging
optical
image pickup
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002045556A
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Japanese (ja)
Inventor
Shingo Hayakawa
慎吾 早川
Original Assignee
Canon Inc
キヤノン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc, キヤノン株式会社 filed Critical Canon Inc
Priority to JP2002045556A priority Critical patent/JP2003250080A/en
Publication of JP2003250080A publication Critical patent/JP2003250080A/en
Pending legal-status Critical Current

Links

Abstract

(57) [Problem] There is a demand for a small and inexpensive imaging device capable of performing viewfinder observation and automatic focus detection using an electronic viewfinder. SOLUTION: A reflecting member 2 which can advance and retreat with respect to an imaging optical path.
And an image sensor 7 that photoelectrically converts an optical image formed by light reflected by a reflection member positioned in a photographing optical path,
A finder image is generated using the output from the first pixel group among all the pixels constituting the image sensor, and the second finder image is generated.
And a signal processing means 8 for detecting the focus adjustment state of the photographing optical system 1 using the output from the pixel group described above. In addition, a condensing optical system 4 is arranged near a predetermined image forming plane of light reflected by a reflecting member located in a photographing optical path, and a re-imaging optical system for re-imaging light passing through the condensing optical system. 6 is provided, and the image pickup device is arranged on the re-imaging plane by the re-imaging optical system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographing apparatus such as a single-lens reflex type digital still camera and a film camera.

[0002]

2. Description of the Related Art A typical single-lens reflex camera has a reflecting mirror (main mirror or quick return mirror) that can move forward and backward with respect to a photographing optical path formed behind a replaceable photographing lens (inside the camera body). When observing with the viewfinder, the subject light flux reflected by the reflecting mirror located in the shooting optical path is focused on the focal plane of the focusing screen to form an erect normal image through an optical member for erect image formation such as a pentaprism. Magnify and observe.

The focal plane of the focusing screen is arranged at a position equivalent to the planned image forming plane of the photographing lens when the reflecting mirror is retracted out of the photographing optical path, and the composition (object image) of the photographing screen is optically determined. It is configured to observe.

Further, recent general single-lens reflex cameras often have an automatic focusing function (AF function). In this case, the reflecting mirror that guides the subject light flux to the optical system for finder observation is a half mirror, and another reflecting mirror (sub-mirror) is placed behind this half mirror to extract the light flux for focus detection. A focus detection device for detecting the focus adjustment state of the photographing lens using a signal obtained by photoelectrically converting the light flux by the image sensor is provided.

In such a focus detection device, a condenser lens disposed near the planned image forming plane of the subject light flux reflected by the sub-mirror and a subject light flux emitted from the exit pupil of the photographing lens by this condenser lens are respectively collected. It has a re-imaging optical system in which a pair of apertures are arranged at a position where it is illuminated, and a pair of image pickup elements arranged in an imaging plane of the re-imaging optical system. Then, the focus adjustment state is detected by comparing the output signals from the pair of image pickup devices.

On the other hand, in a camera such as a video camera in which an image pickup element is arranged on the planned focal plane of a taking lens and outputs an image pickup signal, the image pickup signal is also used for confirming the shooting state (viewfinder observation). The most common is to That is, in many cases, a so-called electronic viewfinder is provided for inputting an image pickup signal to an image display device such as a liquid crystal and magnifying and observing with an eyepiece lens or the like for confirmation and determination of a photographing composition.

Also for the focus detection, a method of extracting a component of a specific frequency from the image pickup signal and calculating a contrast signal thereof is also often adopted.

[0008]

In the above-described single-lens reflex camera, since the two reflecting mirrors (main mirror and sub-mirror) are arranged behind the taking lens, the back focus of the taking lens must be maintained sufficiently long. is necessary. Also, in the viewfinder optical system, it is efficient to configure an optical viewfinder using a pentaprism or the like due to the restrictions on the arrangement of the focusing screen and the viewer's pupil position, but this is a major obstacle to the miniaturization of the entire camera. It is a factor.

Further, in the focus detection device, since the sub-mirror smaller than the main mirror is used, only the light flux in a partial area of the photographing screen can be received, and the focus detection corresponding to almost the entire area of the photographing screen is performed. The problem is that it is practically difficult.

Further, when a so-called electronic viewfinder suitable for mounting various display functions as a finder is mounted, there is a problem in that it is difficult to arrange a photographing image pickup device for picking up a subject image. .

Here, it is considered that the viewfinder and the focus detection device of the video camera described above are directly applied to a single-lens reflex camera.

First, since a camera using a silver salt film does not use an image pickup element, it cannot be realized in principle.

On the other hand, with a single-lens reflex digital camera using an image pickup device, a structure similar to that of a video camera can be realized, but it is difficult to take measures against smear that tends to occur when photographing a high-luminance subject.

Therefore, in a single-lens reflex camera, for example, a reflecting mirror may be arranged behind the photographing optical system, and further, an image pickup element may be arranged at a position where the focusing screen is arranged in the conventional single-lens reflex camera. To be

However, an image pickup device having a large area, which is so large that it is arranged in place of the focusing screen, is expensive, so that it is difficult to use it only for the finder observation function.

Further, in a focus detection method used in a video camera or the like for calculating a contrast signal of a specific frequency of a subject image using an output signal of an image pickup device, focus adjustment is performed in a non-focused state. Since it is difficult to determine how to drive the focus adjustment of the shooting lens,
There is a problem that it takes a long time to reach the focused state. Therefore, it is originally not suitable for a still camera that uses a long-focus lens having a large lens drive amount for focus adjustment as a photographing lens.

Therefore, an object of the present invention is to provide a photographing apparatus which is small and inexpensive, but which is capable of finder observation and automatic focus detection by a so-called electronic viewfinder.

[0018]

In order to achieve the above object, the image pickup device of the present invention uses a reflecting member that can move forward and backward with respect to a photographing optical path and light reflected by a reflecting member located in the photographing optical path. An image sensor for photoelectrically converting the formed optical image, and a viewfinder image is generated using the output from the first pixel group of all the pixels forming the image sensor, and the image from the second pixel group is generated. Signal processing means for detecting the focus adjustment state of the photographing optical system using the output.

In this way, a viewfinder image is generated by using the output from a part of the pixel group (first pixel group) of the single image pickup device that receives the light reflected by the reflecting member, and the other image is generated. By detecting the focus adjustment state of the photographic optical system using the output from the pixel group (second pixel group), it is small and inexpensive, but the viewfinder observation function and automatic focus detection (adjustment) function by the electronic viewfinder are also available. It is possible to realize a photographing device that has both of the following.

Further, a condensing optical system is arranged in the vicinity of the planned image forming surface of the light reflected by the reflecting member located in the photographing optical path, and re-imaging is performed to re-image the light passing through this condensing optical system. By providing an optical system and arranging the image sensor on the re-imaging surface of the re-imaging optical system, a small image sensor is used to provide a wide range of the photographic screen (for example, almost the exit pupil of the re-imaging optical system). If the image pickup device receives the light flux from the whole, it is possible to form a finder image and to detect the focus for almost the entire photographing screen).

The first pixel group and the second pixel group are discrete (for example, alternate) in the image sensor.
Can be placed at.

Further, in each pixel forming the second pixel group,
A micro optical member such as a micro lens may be provided for each pixel so that a light beam from a part of the exit pupil of the re-imaging optical system is selectively received.

In addition to the above-mentioned image pickup device, the present invention has a photographic image pickup device for photoelectrically converting an optical image formed by light passing through the photographic optical path in a state where the reflecting member is retracted from the photographic optical path. The present invention can be applied to both a digital camera and a film camera that records an optical image formed by light passing through the photographing optical path on a film in a state where the reflecting member is retracted from the photographing optical path.

[0024]

1 shows the configuration of a single-lens reflex camera system (imaging system) according to an embodiment of the present invention.

In the figure, 1 is an interchangeable photographing lens (photographing optical system), and 20 is a single-lens reflex camera.

In the single-lens reflex camera 20, 2
Is a quick return mirror (reflecting member) that can be rotated in the vertical direction. The quick return mirror is located in the shooting optical path when observing the viewfinder and retracts outside the shooting optical path when shooting.

Reference numeral 3 denotes a planned image forming surface of the photographing lens 1, on which an image pickup device for photographing or a silver salt film is arranged.

Reference numeral 4 denotes a condenser lens arranged near the planned image forming plane of the light which is incident from the photographing lens 1 and reflected by the quick return mirror, and 5 deflects the light which has passed through the condenser lens 4 and is compact as a whole. It is a plurality of mirrors that constitute a viewfinder imaging system.

Reference numeral 6 is a re-imaging optical system for reducing and re-imaging a subject image in the viewfinder imaging system, and 7 is a CC
It is an image pickup device (image pickup device referred to in the claims) for finder image pickup which is composed of D, CMOS and the like.

Reference numeral 8 is a microcomputer (signal processing means) for processing the image pickup signal output from the image pickup device 7.

Reference numeral 10 is a display driver for displaying the finder image (image picked up by the image pickup device 7) generated by the microcomputer 8 on the liquid crystal device 11. Reference numeral 12 is an eyepiece for magnifying and observing the image displayed on the liquid crystal element 11, and 13 is the position of the observer's pupil.

Further, in the taking lens 1, 9 is a focus driving unit for driving a focus adjusting lens (not shown) in the taking lens 1, a focus motor and a motor driver for driving this motor (neither is shown). ) And.

In the camera system constructed as described above, upon observing the viewfinder, the subject light flux incident from the photographing lens 1 is reflected upward by the quick return mirror 2 to form a subject image in the vicinity of the condenser lens 4. Further, the subject light flux is condensed by the condenser lens 4, deflected by the plurality of mirrors 5, and then reduced by the re-imaging optical system 6 onto the image pickup device 7 and re-imaged.

An output signal output from the image pickup device 7 that receives the object image is processed by a microcomputer 8, and the microcomputer 8 outputs an image signal for finder observation and focus detection indicating a focus adjustment state of the taking lens 1. The signals and are output.

The image signal is transmitted to the display driver 10,
The display driver 10 drives the liquid crystal element 11 according to the image signal. As a result, the finder image displayed on the liquid crystal element 11 is enlarged through the eyepiece lens 12 and emitted to the observer's pupil position 13.

Further, the focus detection signal is transmitted to the motor driver in the focus drive unit in the photographing lens 1, and the motor driver drives the focus motor based on the focus detection signal to adjust the focus.

FIG. 2 shows a pixel array on the light receiving surface of the image pickup device 7. FIG. 2A shows the overall configuration of the image pickup device 7, and in FIG.
Reference numerals 1, 202, 203, ... Represent pixels, respectively.
A predetermined function is assigned to each of these pixels in advance.

FIG. 2B is a viewfinder image forming pixel group (first pixel group) to which a function for forming a viewfinder image is assigned among all the pixels shown in FIG. 2A.
Is shown. In this figure, pixels marked with R, G, and B are pixels having transmittance characteristics corresponding to visual red, green, and blue, respectively.

In this pixel group, one pixel for R, two pixels for G, and one pixel for B make up a total of four pixels, and this group is further arranged in the image sensor 7. It is arranged discretely (but with a certain regularity).

In addition, in FIGS. 2C and 2D, the pixels to which HAF1, HAF2, HAF3, HAF4 are attached are focus points to which a function for detecting the image shift amount in the horizontal direction is assigned. It is a pixel group for detection (second pixel group). In this pixel group, pixels HAF1, H
The AF2 and the pixels HAF3 and HAF4 form one aggregate for forming one image, and these aggregates are discretely (with a certain regularity) arranged in the image sensor 7. Has been done.

In FIGS. 2 (e) and 2 (f), the pixels to which VAF1, VAF2, VAF3 and VAF4 are added respectively have focus points to which a function for detecting the image shift amount in the vertical direction is assigned. It is a pixel group for detection (second pixel group). In this pixel group, pixels VAF1, V
The AF2 and the pixels VAF3 and VAF4 each form one aggregate for forming one image, and these aggregates are arranged discretely (but with a certain regularity) in the image sensor 7. Has been done.

The pixel group (R, G, B) for forming the finder image and the pixel group (HAF1, HAF for focus detection).
AF2, HAF3, HAF4, VAF1, VAF2, V
AF3 and VAF4) are arranged alternately in the horizontal and vertical directions within the image sensor 7.

FIG. 3A is an enlarged view of the AA portion of the image pickup device 7 shown in FIG. 2A, and FIG. 3B is a sectional view of the AA portion. Are enlarged and shown. Also,
FIG. 3C shows B- of the image pickup device 7 shown in FIG.
The B part is shown in an enlarged manner.
The cross section of B part is expanded and shown.

In these drawings, reference numeral 31 is a microlens provided for each pixel of the image pickup device 7 and exerting a condensing effect on the incident light flux. Reference numeral 32 is a color filter for appropriately correcting the spectral transmittance characteristic. Reference numeral 33 represents a light receiving portion for each pixel.

The microlens 31 is formed so as to form an image of the exit pupil of the re-imaging optical system 6 at the position of the light receiving portion 33 for each pixel.

FIG. 4 shows a projected image when the light receiving portion 33 for each pixel shown in FIG. 3 is projected on the exit pupil of the re-imaging optical system 6 shown in FIG. FIG. 4 (a) is the same as FIG.
The image group (R,
The projected images of G and B) are shown. This figure shows that when the shape of the exit pupil of the re-imaging optical system 6 is 50, FIG.
It is shown that the light receiving unit 33 shown in (b) is projected onto the exit pupil 50 as an image 41.

FIG. 4B is a projected image of a focus detection pixel group (VAF1, VAF2, VAF3, VAF4) for detecting the vertical shift amount shown in FIGS. 2E and 2F. Is shown. This figure shows that when the shape of the exit pupil of the re-imaging optical system 6 is 50, the light receiving unit 33 shown in FIGS.
It is shown that it is projected like 45.

FIG. 4C is a projected image of a focus detection pixel group (HAF1, HAF2, HAF3, HAF4) for detecting the horizontal shift amount shown in FIGS. 2C and 2D. Is shown. In this figure, assuming that the shape of the exit pupil of the re-imaging optical system 6 is 50, the light receiving section corresponding to the light receiving section 33 shown in FIGS. 3 (c) and 3 (d) is rotated by 90 degrees. It is shown that images are projected on the pupil 50 as images 46, 47, 48, and 49.

As described above, in the present embodiment, the image pickup device 7
With respect to the exit pupil of the re-imaging optical system 6 and only a part of the exit pupil of the re-imaging optical system 6 and a group of pixels R, G and B which receive a light beam passing through almost the entire surface thereof. Pixels HAF1, HAF2, HAF3, which selectively receive only the light flux
HAF4 aggregate and images VAF1, VAF2, VA
An assembly of F3 and VAF4 is integrally formed on one image sensor 7.

Pixels R, G, B for forming a finder image
Since the aggregates of are aggregated in a discrete manner as described above, if only the output signals of these aggregates are taken out, a thinned out finder image is formed as a whole. Further, since each of these pixels is provided with the color filter 32 shown in FIG. 3B, each pixel for forming a finder image has a luminous efficiency R,
Luminance signals corresponding to G and B are output.

These signal outputs are processed into image signals by the microcomputer 8 and then sent to the display driver 10. The display driver 10 drives the liquid crystal element 11 according to the image signals. Thereby, the observer can observe the finder image through the eyepiece lens 11.

At this time, in this embodiment, the ratio of the number of horizontal samplings to the number of vertical samplings of the image obtained from the aggregate of pixels is different from that of the original image, but the liquid crystal for outputting the image signal is The ratio of the number of pixels of the element 11 in both the horizontal and vertical directions is set in accordance therewith, or the output image is further interpolated or thinned to match the ratio of the number of pixels of the original image in both the horizontal and vertical directions to obtain an appropriate value. It is possible to observe the viewfinder image.

Further, each pixel VAF for focus detection
When the signal outputs from the two aggregates 1 and VAF2 are individually taken out to form two images, these images are respectively re-imaging optical system 6 shown in FIG.
Image formed by the light flux that has passed through the lower area (46) of the exit pupil 50 of the image, and the image formed by the light flux that has passed through the upper area (47) of the exit pupil 50 of the re-imaging optical system 6. Therefore, by calculating the vertical displacement amount of these two images, the vertical defocus amount of the observed object can be calculated.

Further, each pixel VAF for focus detection
When the signal outputs from the two assemblies 3 and VAF 4 are individually taken out to form two images, these images are respectively re-imaging optical system 6 shown in FIG.
Image formed by the light flux that has passed through the lower region (48) of the exit pupil 50 and the image formed by the light flux that has passed through the upper region (49) of the exit pupil 50 of the re-imaging optical system 6. Therefore, by calculating the vertical displacement amount of these two images, the vertical defocus amount of the observed object can be calculated.

The exit pupil of the re-imaging optical system 6 is arranged so that its entrance pupil has an imaging relationship with the exit pupil of the photographing lens 1 by the condenser lens 4, respectively.
The luminous flux passage area at the exit pupil position of the re-imaging optical system 6 shown in (1) has a positional relationship obtained by rotating the luminous flux passage area at the exit pupil position of the photographing lens 1 by approximately 180 °.

Further, the pixel aggregate for extracting two images for focus detection corresponds to the focus detection area in the photographing screen selected by the user of the camera or automatically selected by the microcomputer 8. , The microcomputer 8 selects.

The defocus amount calculated using the output signal of the aggregate of the pixels VAF1 and VAF2 is the pixel V
Compared to the defocus amount calculated using the output signal of the aggregate of AF3 and VAF4, the light flux that has passed through the peripheral portion of the exit pupil of the re-imaging optical system 6 is used, and therefore the detection accuracy is improved. Can be a high signal.

However, the output signal of the aggregate of the pixels VAF1 and VAF2 has a harmful effect that partial eclipse is likely to occur due to the image formation relationship between the exit pupil of the photographing lens 1 and the entrance pupil of the re-imaging optical system 6. ing. Therefore, in order to perform focus detection using the aggregate of these pixels, the exit pupil position of the photographing lens 1 or Fno. In some cases, it may be necessary to limit the number of times, or to limit the range of image formation for performing focus detection using this image.

On the other hand, each pixel HAF for focus detection
When the signal outputs from the two aggregates of 1 and HAF2 are individually taken out to form two images, these images are respectively re-imaging optical system 6 shown in FIG. 3 (b).
An image formed by the light flux that has passed through the area (42) on the right side of the exit pupil 50 of the image, and an image formed by the light flux that has passed through the area (43) on the left side of the exit pupil 50 of the re-imaging optical system 6. By calculating the lateral displacement amount of these two images, the horizontal defocus amount of the observed object can be calculated.

Further, each pixel HAF for focus detection
When the signal outputs from the two aggregates 3 and HAF 4 are individually taken out to form two images, these images are respectively re-imaging optical system 6 shown in FIG. 3B.
An image formed by the light flux that has passed through the region (44) on the right side of the exit pupil 50 of the image, and an image formed by the light flux that has passed through the region (45) on the left side of the exit pupil 50 of the re-imaging optical system 6. By calculating the lateral displacement amount of these two images, the horizontal defocus amount of the observed object can be calculated.

The characteristics of the defocus amount calculated by the pixels corresponding to these horizontal defocus amounts are:
This is the same as the defocus amount calculated by the pixel corresponding to the vertical defocus amount.

In the present embodiment, no color filter that transmits only a specific wavelength is arranged in each pixel of the focus detection pixel group. This is because the light-receiving sections 33 are configured to selectively receive only the light flux that passes through a part of the exit pupil of the re-imaging optical system 6, and therefore there is a concern that the amount of received light will decrease. Is.

Of course, in the case of requesting more accurate focus detection by calculating the defocus amount information in which the color information of the image and the filter for correcting the visibility of the object are also calculated,
A filter may be arranged as appropriate.

As described above, the pixel group for forming the finder image, which is composed of the discrete pixel group that receives most of the light flux emitted from the exit pupil of the re-imaging optical system 6, is shown in FIG. ) Corresponds to the pixel groups R, G, and B shown in FIG.

Further, the focus detection pixel group composed of a discrete pixel group which selectively receives only the light flux from a part of the exit pupil of the re-imaging optical system is shown in FIG.
Pixel groups HAF1, HAF2, HAF3 shown in (f)
It corresponds to HAF4, VAF1, VAF2, VAF3, VAF4.

In the present embodiment, the finder image forming pixel group and the focus detecting pixel group are set to one.
By being integrally configured on one image pickup device 7 and used for both generation of a finder image and detection of the focus adjustment state of the taking lens 1 (focus detection), a so-called electronic viewfinder can be realized while being small and inexpensive. It is possible to realize a single-lens reflex camera that is equipped with a finder observation function having many functions and an automatic focus detection function for almost the entire shooting screen.

Further, by performing the focus detection by the so-called phase difference detection method as in the present embodiment, the focus adjustment time until the focus is obtained can be shortened as compared with the case of using the contrast method.

In the present embodiment, the case where the set of pixels used for focus detection is a pair of sets has been described, but light beams from different positions of the exit pupil of the re-imaging optical system are received. It is more preferable to form an aggregate of a plurality of sets of pixels in advance and appropriately use the output signal to be compared again for focus detection, for example, according to the characteristics of the attached photographing lens. It is possible to detect various focal points.

In the present embodiment, the case where the focus detection is performed by the phase difference detection method has been described, but in the present invention, the focus detection may be performed by the so-called contrast detection method. In this case, it is suitable when a lens with a very long focus is not assumed as a shooting lens, and by limiting the area used for focus detection to a specific position within the shooting screen, the calculation time for focus adjustment is reduced. Etc. can be shortened.

Further, in this embodiment, when the focus detection is performed, the image pickup device 7 is formed so as to selectively receive only the light beam emitted from the specific position of the exit pupil of the re-imaging optical system 6. Although the position of the light receiving portion of each pixel is individually changed, a fine optical member disposed above a specific pixel, in some cases, substantially the entire exit pupil of the re-imaging optical system 6 and the light receiving portion. It has a micro-lens shape that makes it an imaging
It is also conceivable that some of the re-imaging optical system 6 may have a microlens shape in which a specific part of the exit pupil of the re-imaging optical system 6 and the light receiving portion are in an image forming relationship with different refractive power and different optical path lengths to the light receiving portion.

Further, it may be considered that a micro prism-like fine shape is formed in place of the micro lens in the pixel which receives only the light flux that has passed through a specific partial area of the exit pupil of the re-imaging optical system 6. To be

Of course, it is conceivable that these structures are formed not only on the surface of the image pickup device but also as an in-layer lens or an in-layer prism inside a plurality of layers forming the image pickup device.

[0073]

As described above, according to the present invention,
A viewfinder image is generated by using the output from a part of the pixel group (first pixel group) of the single image pickup device that receives the light reflected by the reflecting member, and another finder image (second pixel group) is generated. group)
Since the focus adjustment state of the photographic optical system is detected using the output from the camera, it is possible to realize a photographic device that has both a viewfinder observation function with an electronic viewfinder and an automatic focus detection (adjustment) function, while being small and inexpensive. You can

Further, a condensing optical system is arranged in the vicinity of the planned image forming surface of the light reflected by the reflecting member located in the photographing optical path, and re-imaging is performed to re-image the light passing through this condensing optical system. By providing an optical system and arranging the image sensor on the re-imaging surface of the re-imaging optical system, a small image sensor is used to cover a wide range of the photographing screen (for example, almost the entire exit pupil of the re-imaging optical system). If the image pickup device receives the light flux from, the formation of the finder image and the focus detection can be performed for almost the entire photographing screen).

[Brief description of drawings]

FIG. 1 is a sectional view showing the configuration of a single-lens reflex camera system that is an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an image sensor for finder observation in the single-lens reflex camera.

FIG. 3 is a partially enlarged view and a sectional view of the image pickup device.

FIG. 4 is an explanatory diagram of a light ray passing region in an exit pupil of the re-imaging optical system in the single-lens reflex camera.

[Explanation of symbols]

1 Shooting lens 2 quick return mirror 3 Planned image plane of the taking lens 1 4 condenser lens 5 mirror 6 Re-imaging optical system 7 Image sensor 8 microcomputer 9 Focus drive unit 10 Display driver 11 Liquid crystal element 12 eyepiece 13 Observer's pupil position

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) G03B 19/12 H04N 101: 00 5C024 H04N 5/225 G02B 7/11 N 5/335 C // H04N 101: 00 G03B 3/00 A F-term (reference) 2H011 AA03 BA21 BB01 BB02 2H051 AA00 AA06 BA06 BA14 CA04 CB09 CB11 CB22 CB29 2H054 CA15 CC00 CD01 CD03 2H101 EE08 5C022 AB26 AC03 AC12 AC42 AC54 AC69 AC77 AC78 5C024 AX01 BX01 CY17 DX04 EX04 EX41 EX42 EX43 JX09

Claims (11)

[Claims]
1. An image pickup device comprising: a reflecting member capable of moving forward and backward with respect to a photographing optical path; and an image pickup device for photoelectrically converting an optical image formed by light reflected by the reflecting member located in the photographing light path. A finder image is generated using the output from the first pixel group of all the pixels that form the element, and
An image pickup apparatus comprising: a signal processing unit that detects a focus adjustment state of an image pickup optical system by using an output from the second pixel group.
2. A condensing optical system disposed in the vicinity of a planned image forming plane of light reflected by the reflecting member located in the photographing optical path, and a re-imaging system for re-imaging the light passing through the condensing optical system. The imaging device according to claim 1, further comprising an imaging optical system, wherein the image pickup device is arranged on a re-imaging surface formed by the re-imaging optical system.
3. The image pickup apparatus according to claim 1, wherein the first pixel group is composed of a plurality of pixel aggregates discretely arranged in the image sensor.
4. The second pixel group according to claim 1, wherein the second pixel group is composed of a plurality of pixel aggregates discretely arranged in the image sensor. Imaging device.
5. The first pixel group and the second pixel group each include a plurality of pixel aggregates that are discretely arranged in the image sensor, and the first pixel group. 3. The image pickup apparatus according to claim 1, wherein the pixel aggregates that form the pixel group and the pixel aggregates that form the second pixel group are alternately arranged.
6. The image pickup apparatus according to claim 2, wherein all the pixels of the image pickup device receive a light beam from substantially the entire exit pupil of the re-imaging optical system.
7. Each pixel forming the second pixel group comprises:
The imaging device according to claim 1, wherein each pixel is provided with a fine optical member.
8. The signal processing unit according to claim 1, wherein the focus adjustment state is detected by a phase difference detection method using the output from the second pixel group. Shooting device.
9. In addition to the image pickup device, an image pickup device for photographing which photoelectrically converts an optical image formed by light passing through the photographing light path in a state where the reflecting member is retracted outside the photographing light path is provided. The imaging device according to any one of claims 1 to 8, which is characterized.
10. The optical image formed by the light passing through the photographing optical path in the state where the reflecting member is retracted from the photographing optical path, and the film is recorded on a film. The imaging device described.
11. An imaging system, comprising: the imaging device according to claim 1; and an imaging optical system that can be attached to and detached from the imaging device.
JP2002045556A 2002-02-22 2002-02-22 Imaging apparatus and imaging system Pending JP2003250080A (en)

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Cited By (23)

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