JPH06167652A - Focus detecting device and automatic focus type photographing device - Google Patents

Abstract

PURPOSE:To obtain a TTL-phase difference AF system which is suitable to a camera, etc., used in common for both normal size and panoramic size. CONSTITUTION:The device consists of a condenser lens 3 which is arranged nearby the expected image formation plane 2 of a photographic lens 1, a brightness stop 6 which has a couple of opening parts arranged behind the lens 3, a couple of separator lenses 7 which are arranged behind the brightness stop 6 respectively, a photodetecting element array 8 which is arranged nearby the image formation position of luminous flux projected by the separator lens 7, and a couple of conversion lenses 9 which are put in and out of a focus detection system and has positive power; and the conversion lenses 9 are inserted into the focus detection system in a normal size state and retracted in a panoramic size state, and the absolute value of the projection magnifications of a focus detection optical system is larger than that in the normal size state, thereby improving the focusing precision.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focus detecting device and an automatic focusing type photographing device, and more particularly to a focus detecting device and an automatic focusing type photographing device for improving focusing accuracy or narrowing a range for trimming in a photographing device capable of trimming. The present invention relates to a focus type photographing device.

[0002]

2. Description of the Related Art Autofocus type photographing apparatuses which can obtain an in-focus image even if the photographer does not perform so-called focusing have been highly evaluated for their convenience and have been commercialized.
Various focus detection devices mounted on such an autofocus imaging device as an autofocus camera have been proposed. Among them, the focus detection using the light flux passing through the photographing optical system or a part of the photographing optical system does not have parallax depending on the photographing distance, and at the time of focusing, the manufacturing error of the photographing lens etc. It is possible to check and correct the driving error of the shooting lens to make it possible, and even if the lens is exchanged, if the light flux incident on the focus detection device is secured, there is an advantage that the focusing accuracy does not change. Widely used mainly for reflex cameras. As described above, as a typical focus detection using the light flux that has passed through the photographing optical system or a part of the photographing optical system, the light flux that has passed through different pupils of the photographing lens is re-imaged by a pair of lenses, and The so-called phase correlation method, which detects the focus by utilizing the fact that the inter-image distance between the two images changed according to the defocus, detects the contrast of the image formed by the photographing optical system,
There is a so-called contrast method in which the focus is detected by searching for a position where the contrast becomes maximum.

The principle of the phase difference method will be described with reference to the optical path diagram of FIG. The one shown in FIG. 18 is a condenser lens 3 arranged in the vicinity of a planned image formation plane (planned focal plane, film equivalent plane) 2 and an interval arranged behind the condenser lens 3 for ensuring focusing accuracy. It is composed of a pair of separator lenses 7 arranged in parallel with each other, and a photoelectric conversion element array 8 arranged at an image forming position of a light beam emitted from the separator lens 7.

When the taking lens 1 is focused, an object image I is formed on the planned image forming surface 2. The object image I is re-imaged by the condenser lens 3 and the compound-eye re-imaging lens 7 on a secondary imaging surface (photoelectric conversion element array 8) perpendicular to the optical axis of the taking lens 1. It becomes the first image I ₀₁ and the second image I ₀₂ . When the object lens F is formed on the front focus of the taking lens 1, that is, on the front side of the planned image forming surface 2, the object images F are reproduced perpendicularly to the optical axis of the taking lens 1 so that they are close to each other. The images are formed into a first image F ₀₁ and a second image F ₀₂ . Also,
If the object image B is formed on the rear focus of the taking lens 1, that is, on the rear side of the planned image forming surface 2, the object images B are re-imaged perpendicularly to the optical axis while being separated from each other. Has been
It becomes the first image B ₀₁ and the second image B ₀₂ . The first image and the second image are oriented in the same direction, and by detecting the distance between the two images, it is possible to detect the focus state of the taking lens 1 including the front focusing amount and the rear focusing amount. is there. Specifically, this first
Detecting the intensity distribution of light on the light receiving element array 8 of the image and the second image,
The interval between both images is obtained by performing arithmetic processing or the like. Many focus detection optical systems having the above-mentioned structure have been proposed so far, for example, Japanese Patent Laid-Open Nos. 55-118019, 58-106511 and 60-.
There is one described in Japanese Patent No. 32012.

The principle of the contrast method will be described with reference to the optical path diagrams of FIGS. 19 and 20, the condenser lens 3 arranged near the planned image forming plane (planned focal plane, film equivalent plane) 2 and the re-imaging lens 2 arranged behind the condenser lens 3.
1 and a photoelectric conversion element array 22 arranged at a position conjugate with the planned image formation plane 2. FIG. 19 shows a state in which the light flux passing through the taking lens system 1 is imaged on the planned image forming surface 2, and FIG.
The state where the image is formed on the front side (the front focus state) is shown.
In the state of FIG. 19, blurring on the photoelectric conversion element array 22 is small, that is, the contrast is high. In the state of FIG. 20,
The blur on the photoelectric conversion element array 22 is large, that is, the contrast is low. If the taking lens system 1 is always moved in the direction in which the contrast increases, the taking lens system 1 can be moved to the in-focus position and focusing can be performed. Further, as described in Japanese Patent Laid-Open No. 63-127217, the contrast of an image formed by a photographing optical system is detected at two positions in the vicinity of a planned image forming plane, and the focus is detected based on this. You can also It is also known that the focus position can be detected by moving the re-imaging lens. In a photographing apparatus using an electronic image pickup device such as a so-called video camera, the contrast may be directly evaluated from the output from the electronic image pickup device to perform focusing.

On the other hand, this is a type of trimming photography, and recently, a 35 mm Leica format film is used, and one frame on the film is exposed with a size of about 36 mm × 12 mm (usually about 36 mm × 24 mm), which is about 7 mm. The image is doubled in size (usually, most people enlarge it by about 3.5 times (so-called service size) in many cases), and often enjoy powerful photographs. Such pictures are called panoramic pictures. Many cameras that can shoot in panoramic size have also been commercialized, and further,
Cameras that can easily switch between normal size and panoramic size have been commercialized, and the demand for them is increasing.

[0007]

However, no TTL-phase difference AF (automatic focus detection) system optimal for a camera capable of trimming photographing such as a camera for both normal size and panoramic size has been proposed.

The following is a description of an autofocus type image pickup apparatus in which the reproduction range of a photographed image is variable. Here, for simplification, a switching camera between the normal size and the panorama size is taken as an example. Many of the main subjects of ordinary camera users are people. For example, consider a case where a person-centered commemorative photo is taken against a beautiful mountain range as shown in FIG.
Figure 2 shows the shooting range when shooting a person-centered image in normal size
FIG. 23 shows a shooting range when shooting a person in a panorama size with a mountain background. The composition in FIG. 23 is
The film is exposed as shown in FIG. At this time, when shooting a panorama size as compared to the normal size, it is necessary to shorten the shooting focal length or move away from the subject. The range shown by the dotted line in FIGS. 22, 23, and 24 is the range. Although the distance measuring range is the same on the film, the size of the subject reflected in it is very different. If the subject that enters the range is too large, it becomes difficult for the focus detection system to capture the features (contrast) of the subject, and the focusing accuracy becomes low. Also, as shown in FIG. 24, when the subject becomes small and objects near and far in the distance measuring range enter, a phenomenon called so-called perspective mixing occurs, and focusing accuracy or focusing accuracy (focusing is possible). Probability) deteriorates.

Further, as described above, in general, the panorama size has a stretching magnification of about 2 times the normal size, so that it becomes necessary to make the focusing accuracy higher than the normal size. On the other hand, the panorama size often uses a lens that is far from the normal size or uses a lens with a short focal length, so the defocus detection range required for the focus detection system is not required to be wider than the normal size. weak.

Further, even if a focus detection system suitable for the set image range to be reproduced is prepared, unless the image is reproduced on the photographic paper according to the setting, it is not possible to obtain an image which is easy to photograph and has a high image quality.

The present invention has been made in view of such a situation, and an object thereof is to take a photograph suitable for a system such as a camera for both a normal size and a panoramic size that changes the reproduction range of the photographed image. An object of the present invention is to provide a focus detection device and an auto-focusing type photographing device which can easily obtain an image of high quality.

[0012]

A focus detection device according to the present invention which achieves the above object is installed in a photographing device capable of trimming photographing such as a camera for both normal size and panoramic size. It is characterized in that the absolute value of the re-projection magnification by the condenser lens and the re-imaging lens is increased in conjunction with the trimming operation such as switching to.

In the case of so-called phase-difference AF, in the photoelectric conversion element array, each light receiving element is usually arranged at equal intervals.
When each of the intervals is 1 pitch, the focusing accuracy is usually expressed as a relative scale for 1 pitch. Assuming that the focusing accuracy is 1 / M of one pitch (M is a constant), and the defocus amount on the image surface per pitch is α, the focusing accuracy Δ on the image surface is Δ = ± ( 1 / M) .alpha .... (1)

Here, the larger Δ is, the poorer the focusing accuracy is,
It can be said that the smaller Δ is, the better the focusing accuracy is. α is calculated as follows. α = (F _W / β) · P (2) where P is the pitch of the light receiving element array, β is the absolute value of the projection magnification of the focus detection optical system, and F _W is the detection center of gravity of the focus detection optical system. It is the F number of the luminous flux.

Further, the phase difference type AF system captures image features (contrast) from a certain number of elements in each photoelectric conversion element array, compares them (correlates), and based on that, from the in-focus position. The defocus amount and the defocus direction of are calculated. The number of elements required for comparison at this time determines the width of the minimum distance measuring range on the image plane. Assuming that the number of elements necessary for obtaining the correlation is N and the size of the minimum distance measurement range on the image plane in the element row direction is W, then W = 1 / β · N · P (3) Become.

That is, when the absolute value of the projection magnification of the focus detection optical system is increased, the focusing accuracy is improved and the distance measuring range is reduced, which meets the conditions of the focus detection system in the panorama size state relative to the normal size state. Further, from the formula (2), the focusing accuracy is improved even if the pitch of the light receiving element rows is reduced. Further, in this case, from the formula (3), the distance measuring range becomes small, which matches the condition of the focus detection system in the panorama size state with respect to the normal size state. Further, from the equation (2), the focusing accuracy is improved even if F _W is reduced.

This is applicable not only to the so-called panoramic size and normal size relationship, but also when taking an exposure size on a film different from the normal size. This size determination method may be a method of determining the exposure size by a light-shielding plate, a method of storing the exposure size on the film or a printing area on the film by an optical or magnetic method, or a method for printing on a printing paper or an electronic printer. At the time of printing, the size may be determined by an order slip or the like.

In the case of the so-called contrast system, when the contrast of the photoelectric conversion element group having an area of S and the frequency of f is evaluated and the magnification of the focus detection re-imaging optical system is β, on the film surface, Area is S / β and frequency is f ×
This means that the β contrast is being evaluated. That is,
When the absolute value of β becomes large, the distance measuring range becomes small and a high frequency cotrust is detected. The higher the frequency, the larger the amount of change in contrast with respect to the same defocus amount, and the focusing accuracy can be improved.

If the absolute value of the projection magnification of the focus detection optical system is increased or the area of the photoelectric conversion element is decreased,
Since the amount of light incident on each photoelectric conversion element is small, (a) the conditions for operating auxiliary means such as lighting of auxiliary light are changed from the normal size, (b) the projection magnification is usually set when the subject brightness is dark. The size may be the same as the size, and the deterioration of the focusing accuracy due to darkness may be prevented.

Further, the autofocus type photographing apparatus according to the present invention has an input means for inputting information relating to a reproduction range of a picked-up image, and a focusing precision setting for setting the focusing precision to a different state according to the information from the input means. Means or a focus detection device having distance measuring range setting means for setting different ranges for distance measurement, and information on a reproduction range of a photographed image based on information from the input means. Is stored in an image storage medium.

That is, the information regarding the reproduction range of the photographed image, which is the trimming information at the time of photographing or the trimming information at the time of reproducing the image, is transmitted to the photographing device by the input means of this information. Next, the photographing apparatus sets the focus detection accuracy or the distance measurement range based on the information of the input range of the image to be reproduced. At this time, if the range of the captured image or the range of the image to be reproduced is narrow, it is considered that the enlargement magnification increases, so the focus detection accuracy is set to be high. Further, when the range of the image is narrow, the range-finding range on the imaging surface is set to be narrow in order to prevent deterioration of the focusing accuracy due to the mixed perspective. If the image range is wide, the enlargement magnification is likely to be small, so good image quality can be obtained even if focus detection accuracy is not high. And focus time are prioritized. In addition, if the range of the image is wide, the focusing accuracy deterioration due to the mixed perspective becomes difficult to occur. Therefore, the range-finding range on the imaging surface is set wide in order to make it easy for the photographer to match the object to be detected. The captured image information is stored in an image recording medium such as a silver salt film, a magnetic tape, or a floppy disk. Further, information regarding the range of the image intended to be captured is stored in such an image storage medium. This storage method will be described in detail in Examples described later. The image information stored in the image storage medium is
Only the part to be trimmed may be used, or the entire part may be used. Then, in accordance with the stored information about the range of the image, the image information is reproduced by a printing paper, a printer, or the like. In this case, ON-LINE or OFF-LINE may be used as a method of transmitting information about the range of the image to the image reproducing means.

The focus detection accuracy and the focus detection range are set by re-projecting the imaged image of the light flux that has passed through the taking lens by the condenser lens and the re-imaging lens, and when detecting the focus from the information, the re-projection magnification factor. May be changed. That is, when the focusing accuracy is increased and the focus detection range on the imaging surface is narrowed, the absolute value of the reprojection magnification by the condenser lens and the reimaging lens is increased. Therefore, it is desirable to adopt the focus detection method as described above.

The detailed structure and operation described above will be described in the description of the embodiments below. In addition, a first embodiment described later,
The second and third embodiments assume a so-called phase-difference AF system by changing the magnification, and the fourth embodiment assumes a so-called contrast-type AF system by changing the magnification. The fifth embodiment assumes a so-called phase-difference AF system that changes the F number of the detected centroid light beam, and the sixth embodiment assumes a so-called phase-difference AF system that changes the pitch of the light-receiving element array. . Furthermore, the seventh and eighth examples assume imaging apparatuses that employ these AF systems.

As is apparent from the above description, the first focus detection device of the present invention is provided in a photographing device having a trimming means that enables trimming photographing, and includes the photographing optical system and the photographing optical system. In a focus detection device having a photoelectric conversion means composed of an array of photoelectric conversion elements for receiving the passed light flux, and a re-imaging optical system for guiding the light flux to the photoelectric conversion means and performing focus detection, a photographing surface by the trimming means Has a focusing precision setting means for setting the focusing precision to a different state when changing the exposure range from one state to the other state and setting the focusing precision to a state where the focusing precision is increased when the exposure range of the photographing surface is narrow. It is characterized by that.

The second focus detection device of the present invention is provided in a photographing device having a trimming means for enabling trimming photographing, and the photoelectric conversion device receives a photographing optical system and a light flux passing through the photographing optical system. In a focus detection device having a photoelectric conversion unit composed of an element array and a re-imaging optical system for guiding the light beam to the photoelectric conversion unit to perform focus detection, the exposure range of the photographing surface is set to one state by the trimming unit. To another state, the range measurement range is set to a different state, and when the exposure range of the photographing surface is narrow, the range measurement range setting means is set to narrow the range measurement range. It is a feature.

In these cases, specifically, the absolute value of the magnification of the re-imaging optical system is increased with the setting of the trimming means for narrowing the exposure range of the photographing surface.

Further, in the autofocus type photographing apparatus of the present invention, the focusing precision setting for setting the focusing precision to a different state according to the inputting means for the information about the reproduction range of the photographed image and the information from the inputting means. Means or a focus detection device having distance measuring range setting means for setting different ranges for distance measurement, and information on a reproduction range of a photographed image based on information from the input means. Is stored in an image storage medium.

[0028]

In the focus detecting apparatus of the present invention, when the trimming photographing such as the panorama size is set, the focusing accuracy is enhanced and the distance measuring range is narrowed. Therefore, the focusing accuracy is better than that in the normal size photographing. Yes, the range can be reduced,
It is possible to configure the TTL-phase difference AF system that is most suitable for a photographing device capable of trimming photographing such as a camera for both normal size and panoramic size.

Further, in the automatic focusing type photographing apparatus of the present invention, when the range of the image to be reproduced is set, the appropriate focus detection accuracy and the range-finding range on the image are set in view of the image quality and the ease of photographing. However, by storing the range of the image to be reproduced in the image storage medium, it is possible to reproduce a good quality image regardless of the range of the image to be reproduced.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The focus detecting device and the autofocus type photographing device of the present invention will be described below based on some embodiments. The present invention relates to a focus detection device of a photographing device capable of trimming photographing and such a photographing device. In the following embodiments, an example in which the camera is used for both a normal size and a panorama size will be shown.

(First Embodiment) FIG. 1 is a sectional view showing a state in which the focus detection device of the first embodiment is arranged at the bottom of a single-lens reflex camera body, and FIG. 2 is a panorama size in the first embodiment. FIG. 3 is an optical path diagram showing the focus detection system of FIG.
It is an optical path diagram showing a focus detection system of a normal size in the first embodiment. This focus detection device includes a condenser lens 3 arranged in the vicinity of a planned image forming surface 2 of a photographing lens 1,
A mirror 5 arranged behind the condenser lens 3,
A diaphragm 6 having a pair of openings arranged behind the mirror 5 and arranged at intervals that can ensure focusing accuracy (arranged in a direction perpendicular to the paper surface in FIG. 1), and the rear of each of the diaphragms 6. , A pair of separator lenses 7, a light-receiving element array 8 arranged near the image forming position of the light flux emitted from the separator lens 7, and a pair of positive-conversion conversion lenses that can be inserted into and retracted from the focus detection system. 9 and 9.

In the normal size state, as shown in FIG.
A pair of conversion lenses 9 are inserted in the focus detection system, and the light flux emitted from the taking lens 1 and passing through the planned image forming surface 2 of the taking lens 1 passes through the condenser lens 3 and the separator lens 7 and the conversion lens 9
And a pair of secondary images I _N1 and I _N2 are formed on the light receiving element array 8. In the panoramic size state, as shown in FIG. 2, the pair of converter lenses 9 are in a state of being retracted from the focus detection system, and the light flux emitted from the taking lens 1 and transmitted through the planned image forming surface 2 of the taking lens 1 is transmitted. After passing through the condenser lens 3 and the separator lens 7, a pair of secondary images I _P1 and I _P2 are formed on the light receiving element array 8.

In the panorama size state, since the conversion lens 9 having a positive refractive power is retracted from the focus detection system, the absolute value of the projection magnification of the focus detection optical system becomes larger than that in the normal size state.

In this embodiment, since the condenser lens 3 and the pair of aperture stops 6 are in the same state in the normal size state and the panoramic size state, the entrance pupil of the focus detection optical system and F _W do not change.

A ray of light passing through the center of the focus detection range on the planned image plane 2 and the center of gravity of each aperture stop 6 (centroid ray I).
It is desirable that the positions where ₁ , 1 ₂ ) enter the photoelectric conversion element array 8 are substantially the same in the normal size state and the panoramic size state. In order to satisfy this, the distance between the lens vertices of the pair of conversion lenses 9 is determined.

Further, it is desirable that the conjugate plane of the focus detection optical system with respect to the planned image formation plane 2 is substantially the same in the normal size state and the panoramic size state. The insertion position and the lens thickness of the conversion lens 9 are determined so as to satisfy this. That is, it is possible to control the combined principal point position of the re-imaging lens 7 and the conversion lens 9 by the insertion position of the conversion lens 9, and the air conversion length by the lens thickness.

Lens data of the first embodiment are shown in Tables 1 and 2 below. No. Is the surface number counted from the planned image formation surface 2, R is the curvature radius of the lens, D is the lens thickness or the air gap, Nd is the refractive index of the d line of the lens, β _N is the image magnification in the normal size state, β _P is the image magnification in the panorama size state, F
_w is the F number of the detected centroid light flux. In the normal size state and the panoramic size state, the same condenser lens 3 and separator lens 7 are used in the same layout, so in Tables 1 and 2, D _N1 and D _P1 , R _N2 and R _P2 , R
_N3 and R _P3 , D _N2 and D _P2 , D _N3 and D _P3 , D _N4 and D _P4 , R _N5
And R _P5 , R _N6 and R _P6 , and D _N5 and D _P5 have the same value. The lens composed of R _N7 , R _N8 , D _N7 and N _N3 serves as the conversion lens 9.

Table 1 (normal size state) No. R D Nd 1 Planned image plane = ∞ D _N1 = 1.8 2 R _N2 = 10.85 D _N2 = 3.0 N _N1 = 1.4926 3 R _N3 = -21.70 D _N3 = 15.0
4 diaphragm Ri _{= ∞ D N4 = 0.1 5 R} N5 = 2.82 D N5 = 1.0 N N2 = 1.4926 6 R N6 = ∞ D N6 = 0.0 7 R N7 = ∞ D N7 = 6.0 N N3 = 1.4926 8 R N8 = -1.69 β _N = -0.25 _FW = 10 Decentering amount of optical axis of separator lens with respect to optical axis of condenser lens: 0.83 Decentering amount of optical axis of conversion lens with respect to optical axis of condenser lens: 1.18 Standard 2 image interval: 2.35 Table 2 ( Panorama size condition) No. R D Nd 1 Planned image plane = ∞ D _P1 = 1.8 2 R _P2 = 10.85 D _P2 = 3.0 N _P1 = 1.4926 3 R _P3 = -21.70 D _P3 = 15.0 4 Aperture = ∞ D _P4 = 0.1 6 R _P5 = 2.82 D _P5 = 1.0 N _P2 = 1.4926 7 R _P6 = ∞ β _P = -0.50 F _W = 10 Decentering amount of separator lens optical axis with respect to condenser lens optical axis: 0.83 Standard 2 image spacing: 2.35 (second embodiment) ) FIG. 4 is an optical path diagram showing a panoramic size focus detection system in the second embodiment, and FIG.
FIG. 6 is an optical path diagram showing a normal size focus detection system in an example. This focus detection device includes a condenser lens 3 arranged in the vicinity of the planned image forming surface 2 of the photographing lens 1 and a mirror 5 arranged behind the condenser lens 3 (FIG. 1).
And the aperture stop 6 arranged behind the mirror 5 and having a pair of openings arranged at intervals with which focusing accuracy can be ensured.
And a pair of separator lenses 10 or 11 arranged behind the aperture stop 6 and a light receiving element array 8 arranged near the image forming position of the light flux emitted from the separator lenses 10 or 11. . The separator lenses 10 and 11 are switched between the panorama size state and the normal size state, and in the panorama size state, the absolute value of the projection magnification of the focus detection optical system is larger than that in the normal size state. In the normal size state, the light flux emitted from the taking lens 1 and passing through the planned imaging surface 2 of the taking lens 1 is
After passing through the condenser lens 3 and the normal-size separator lens 10, a pair of 2's are formed on the light-receiving element array 8.
Subsequent images I _N1 and I _N2 are formed.

In the panoramic size state, the light flux emitted from the taking lens 1 and transmitted through the planned image forming surface 2 of the taking lens 1 passes through the condenser lens 3, the panoramic size separator lens 11, and the light receiving element. A pair of secondary images I _P1 and I _P2 are formed on the row 8. Since the focal length of each of the separator lenses 11 in the panoramic size state is longer than that of each of the separator lenses 10 in the normal size state, the absolute value of the projection magnification of the focus detection optical system becomes larger than that in the normal size state. .

In this embodiment, since the condenser lens 3 and the pair of aperture diaphragms 6 are the same in the normal size state and the panorama size state, the entrance pupil of the focus detection optical system and the F
_W does not change.

A ray of light passing through the center of the focus detection range on the planned image plane 2 and the center of gravity of each aperture stop 6 (the center of gravity ray I).
It is desirable that the positions where ₁ , 1 ₂ ) enter the photoelectric conversion element array 8 are substantially the same in the normal size state and the panoramic size state. In order to satisfy this, the distance between the lens vertices of the pair of conversion lenses 9 is determined.

Further, it is desirable that the conjugate plane of the focus detection optical system with respect to the planned image formation plane 2 is substantially the same in the normal size state and the panoramic size state. The thicknesses of the separator lenses 10 and 11 are determined so as to satisfy this. Specifically, the thickness of the separator lens 11 in the panoramic size state is the same as the thickness of the separator lens 1 in the normal size state.
It is made thinner than 0. That is, the air conversion length can be controlled by the lens thickness.

Tables 3 and 4 below show lens data of the second embodiment. No. Is the surface number counted from the planned image formation surface 2, R is the curvature radius of the lens, D is the lens thickness or the air gap, Nd is the refractive index of the d line of the lens, β _N is the image magnification in the normal size state, β _P is the image magnification in the panorama size state, F _w
Is the F-number of the detected centroid light flux. In the normal size state and the panoramic size state, since the same condenser lens 3 and the pair of apertures 6 are used in the same layout, Table 3,
In Table 4, D _N1 and D _P1 , R _N2 and R _P2 , R _N3 and R _P3 ,
D _N2 and D _P2 and D _N3 and D _P3 have the same value.

Table 3 (normal size state) No. R D Nd 1 Planned image plane = ∞ D _N1 = 1.8 2 R _N2 = 10.85 D _N2 = 3.0 N _N1 = 1.4926 3 R _N3 = -21.70 D _N3 = 15.0 4 Aperture = ∞ D _N4 = 0.1 5 R _N5 = _{2.26 D N5 = 6.4 N N2 =} 1.4926 6 R N6 = amount of eccentricity of the optical axis of _{∞ β N = -0.37 F W =} 10 separator lens with respect to the optical axis of the condenser lens: 0.9 reference image-to-image gap: 2.35 table 4 (panorama size Condition) No. R D Nd 1 Planned image plane = ∞ D _P1 = 1.8 2 R _P2 = 10.85 D _P2 = 3.0 N _P1 = 1.4926 3 R _P3 = -21.70 D _P3 = 15.0
4 Aperture = ∞ D _P4 = 0.1 6 R _P5 = 2.82 D _P5 = 1.0 N _P2 = 1.4926 7 R _P6 = ∞ β _P = -0.50 F _W = 10 Decentering of the optical axis of the separator lens with respect to the optical axis of the condenser lens : 0.83 Reference Two-Image Interval: 2.35 In this embodiment, the exit surfaces of the separator lenses 10 and 11 are flat surfaces, but may have curvature.

(Third Embodiment) FIG. 6 is an optical path diagram showing a panoramic size focus detection system in the third embodiment.
FIG. 7 is an optical path diagram showing a normal size focus detection system in the third embodiment. This focus detection device is provided with a condenser lens 3 arranged in the vicinity of the planned image forming surface 2 of the photographing lens 1, a mirror 5 (FIG. 1) arranged behind the condenser lens 3, and a mirror 5 arranged behind the mirror 5. From the separator lenses 12 or 13, the aperture stop 6 having a pair of apertures arranged at intervals that can secure the focusing accuracy, the pair of separator lenses 12 or 13 arranged at the rear of the aperture stop 6, respectively. The light receiving element array 8 is arranged near the image forming position of the emitted light beam. The separator lenses 12 and 13 are switched between the normal size state and the panorama size state, and in the panorama size state, the absolute value of the projection magnification of the focus detection optical system is larger than that in the normal size state. In the normal size state, the light flux emitted from the taking lens 1 and passing through the planned image forming surface 2 of the taking lens 1 passes through the condenser lens 3, the normal size separator lens 12, and the light receiving element array 8. A pair of 2
Subsequent images I _N1 and I _N2 are formed.

In the panorama size state, the light passes through the condenser lens 3 and the panorama size state separator lens 13 to form a pair of secondary images I _P1 on the light receiving element array 8.
I _P2 is imaged. Since the focal length of each of the separator lenses 13 in the panoramic size state is longer than the focal length of each of the separator lenses 12 in the normal size state,
The absolute value of the projection magnification of the focus detection optical system becomes larger than that in the normal size state.

In this embodiment, since the condenser lens 3 and the pair of aperture stops 6 are the same in the normal size state and the panoramic size state, the entrance pupil of the focus detection optical system and the F
_W does not change.

Further, a ray of light passing through the center of the focus detection range on the planned image plane 2 and the center of gravity of each aperture stop 6 (the center of gravity ray I).
It is desirable that the positions where ₁ , 1 ₂ ) enter the photoelectric conversion element array 8 are substantially the same in the normal size state and the panoramic size state. In order to satisfy this, each exit surface of the separator lens 12 is inclined from the plane perpendicular to the optical axis of the condenser lens.

Further, it is desirable that the conjugate plane of the focus detection optical system with respect to the planned image formation plane 2 is substantially the same in the normal size state and the panoramic size state. The thicknesses of the separator lenses 12 and 13 are determined so as to satisfy this. Specifically, the thickness of the separator lens 13 in the panoramic size is the same as that of the separator lens 1 in the normal size.
It is made thinner than the wall thickness of 2. That is, the air conversion length can be controlled by the lens thickness.

Tables 5 and 6 below show lens data of the third embodiment. No. Is the surface number counted from the planned image formation surface 2, R is the curvature radius of the lens, D is the lens thickness or the air gap, Nd is the refractive index of the d line of the lens, β _N is the image magnification in the normal size state, β _P is the image magnification in the panorama size state, F _w
Is the F-number of the detected centroid light flux. Since the same condenser lens 3 and the pair of apertures 6 are used in the same layout in the normal size state and the panoramic size state, Table 5,
In Table 6, D _N1 and D _P1 , R _N2 and R _P2 , R _N3 and R _P3 ,
D _N2 and D _P2 and D _N3 and D _P3 have the same value.

Table 5 (normal size state) No. R D Nd 1 Planned image plane = ∞ D _N1 = 1.8 2 R _N2 = 10.85 D _N2 = 3.0 N _N1 = 1.4926 3 R _N3 = -21.70 D _N3 = 15.0 4 Aperture = ∞ D _N4 = 0.1 5 R _N5 = _{2.82 D N5 = 6.4 N N2 =} 1.4926 6 R N6 = amount of eccentricity of the optical axis of _{∞ β N = -0.37 F W =} 10 separator lens with respect to the optical axis of the condenser lens: 0.83 exit surface of the separator lens with respect to the optical axis of the condenser lens Angle: 82.8 ° Reference 2 image interval: 2.35 Table 6 (Panorama size state) No. R D Nd 1 Planned image plane = ∞ D _P1 = 1.8 2 R _P2 = 10.85 D _P2 = 3.0 N _P1 = 1.4926 3 R _P3 = -21.70 D _P3 = 15.0 4 Aperture = ∞ D _P4 = 0.1 6 R _P5 2.82 D _P5 = 1.0 N _P2 = 1.4926 7 R _P6 = ∞ β _P = -0.50 _FW = 10 Decentering amount of separator lens optical axis with respect to condenser lens optical axis: 0.83 Separator lens exit surface with respect to condenser lens optical axis Angle: 90 ° Reference 2 image spacing: 2.35 In this embodiment, the exit surfaces of the separator lenses 12 and 13 are flat, but the separator lens 1 has a curvature.
The optical axes of 2 and 13 may be tilted with respect to the optical axis of the condenser lens 3.

In the first, second, and third embodiments described above, the condenser lens and the aperture stop are switched, and the condenser lens, the aperture stop, and the separator lens are used in the optical axis direction and the optical axis direction. The magnification of the focus detection optical system may be changed by moving the focus detection optical system. At this time, if there is no problem in the camera specifications, F _W
Alternatively, the imaging relationship between the planned imaging surface and the photoelectric conversion element array may change.

(Fourth Embodiment) FIG. 8 is an optical path diagram showing a panoramic size focus detection system in the fourth embodiment.
FIG. 9 is an optical path diagram showing a normal size focus detection system in the fourth embodiment. This focus detection device is provided with a condenser lens 3 arranged in the vicinity of the planned image forming surface 2 of the photographing lens 1, a mirror 5 (FIG. 1) arranged behind the condenser lens 3, and a mirror 5 arranged behind the mirror 5. Reimaging lens 14 or 15, a half mirror 16 located behind this reimaging lens 14 or 15, and a half mirror 16
The photoelectric conversion element group 17 located at a position closer to the planned image forming surface 2 than the image forming position of the light beam reflected by, and the photoelectric conversion element group located at a position farther from the planned image forming surface 2 than the image forming position of the light beam transmitted through the half mirror 16. And a conversion element group 18. The re-imaging lenses 14 and 15 are switched between the normal size state and the panorama size state, and in the panorama size state, the absolute value of the projection magnification of the focus detection optical system is larger than that in the normal size state. In the normal size state, the light flux emitted from the taking lens 1 and passing through the planned imaging surface 2 of the taking lens 1 is
After passing through the condenser lens 3 and the re-imaging lens 14 for the normal size state, the photoelectric conversion element groups 17 and 18 are separated into two.
Subsequent images I _NF and I _NR are formed.

In the panorama size state, the light flux emitted from the taking lens 1 and transmitted through the planned image forming surface 2 of the taking lens 1 passes through the condenser lens 3 and the re-imaging lens 15 for the panoramic size state, Photoelectric conversion element group 1
Secondary images I _PF and I _PR are formed on the images 7 and 18, respectively. Since the focal length of the re-imaging lens 15 in the panoramic size state is longer than the focal length of the re-imaging lens 14 in the normal size state, the absolute value of the projection magnification of the focus detection optical system becomes larger than that in the normal size state. .

Further, it is desirable that the conjugate plane of the focus detection optical system with respect to the planned image formation plane 2 is substantially the same in the normal size state and the panoramic size state. The thickness of the re-imaging lenses 14 and 15 is determined so as to satisfy this. Specifically, the thickness of the re-imaging lens 15 in the panoramic size state is set to be smaller than the thickness of the re-imaging lens 14 in the normal size state. That is, the air conversion length can be controlled by the lens thickness.

Tables 7 and 8 below show lens data of the fourth embodiment. No. Is the surface number counted from the planned image formation surface 2, R is the curvature radius of the lens, D is the lens thickness or the air gap, Nd is the refractive index of the d line of the lens, β _N is the image magnification in the normal size state, β _P is the image magnification in the panorama size state, F _w
Is the F-number of the detected centroid light flux. Since the same condenser lens 3 is used in the normal size state and the panoramic size state, D _N1 and D _P1 , R _N2 in Tables 7 and 8 are used.
And R _P2 , R _N3 and R _P3 , and D _N2 and D _P2 have the same value.

Table 7 (normal size state) No. R D Nd 1 Planned image plane = ∞ D _N1 = 1.8 2 R _N2 = 10.85 D _N2 = 3.0 N _N1 = 1.4926 3 R _N3 = -21.70 D _N3 = 15.0 4 Aperture = ∞ D _N4 = 0.1 5 R _N5 = _{2.82 D N5 = 7.0 N N2 =} 1.4926 6 R N6 = -1.69 β N = -0.25 table 8 (panoramic size state) No. R D Nd 1 Planned image plane = ∞ D _N1 = 1.8 2 R _P2 = 10.85 D _P2 = 3.0 N _P1 = 1.4926 3 R _P3 = -21.70 D _P3 = 15.0 4 Aperture − ∞ D _P4 = 0.1 6 R _P5 = 2.82 D _P5 = 1.0 N _P2 = 1.4926 7 R _P6 = ∞β _P = -0.50 In this embodiment, the photoelectric conversion element groups 17 and 18 were used, but this may be a one-dimensional sensor or a two-dimensional sensor.

In this embodiment, the two photoelectric conversion element arrays 17 and 18 are used. However, one photoelectric conversion element array is arranged near the conjugate point of the planned image formation plane 2 to focus the photographing lens 1. It may be a system for finding the focal point while driving the lens.

Further, in this embodiment, the re-imaging lens 1
Although 4 and 15 are switched, the condenser lens or the re-imaging lens may be moved to form a so-called zoom lens, and the magnification of the focus detection optical system may be changed.

(Fifth Embodiment) FIG. 10 is an optical path diagram showing a panoramic size focus detection system in the fifth embodiment, and FIG. 11 shows a normal size focus detection system in the fifth embodiment. FIG. This focus detection device is provided with a condenser lens 3 arranged in the vicinity of the planned image forming surface 2 of the photographing lens 1, a mirror 5 (FIG. 1) arranged behind the condenser lens 3, and a mirror 5 arranged behind the mirror 5. The aperture stop A1 (FIG. 10) having a pair of apertures for normal size photography arranged at intervals that can secure the focusing accuracy, and the pair of apertures for panoramic size photography that can be switched with the aperture stop A1. The aperture stop A2 has a pair of separator lenses 7 disposed behind the aperture stop A1 or A2, and the light-receiving element array 8 disposed near the image forming position of the light flux emitted from the separator lens 7. To be done. FIG. 12A shows the aperture shape of the aperture stop A1 having a pair of apertures for normal size photography, and FIG.
The aperture shape of the aperture stop A2 having a pair of apertures for panoramic size photography is shown. As shown in the figure, since the aperture size of A2 is smaller than the aperture size of A1, the focusing accuracy is improved by switching the aperture stop from A1 to A2 during panorama size photography. In this embodiment, the opening-shaped circumscribed circle A3 has the same size in FIGS. 12 (a) and 12 (b). The circumscribed circle A3 is determined from the size of the exit pupil of the taking lens 1.

(Sixth Embodiment) In the expressions (2) and (3), when the pitch P of the light receiving element rows is reduced, the focusing accuracy is improved and the distance measuring range is reduced, so that the panorama for the normal size state is obtained. It meets the conditions of the focus detection system in the size state.

A sixth embodiment will be described below in which the pitch P of the light receiving element array is reduced during panoramic photography. Figure 13
FIG. 14 is a cross-sectional view showing a state in which the focus detection device of the sixth embodiment is arranged at the bottom of a single-lens reflex camera body, and FIG. 14 shows an optical system in which two photoelectric conversion elements made up of photoelectric conversion element rows having different pitches are provided together. It is an optical path diagram shown. This focus detection device includes a condenser lens 3 arranged near the planned image forming surface 2 of the photographing lens 1, a mirror 28 arranged behind the condenser lens 3 and retractable from the optical path, and reflection of the mirror 28. An aperture stop 30 having a pair of apertures arranged on the optical path and arranged in a direction perpendicular to the plane of the paper with an interval that can ensure focusing accuracy, and behind the aperture stop 30 having a pair of apertures. A focus detection system I including a pair of re-imaging lenses 32 that are respectively arranged and arranged in a direction perpendicular to the paper surface, and a light receiving element 34 that is arranged at an image forming position of a light beam emitted from the re-imaging lens 32. The aperture stop is arranged on the optical path when the mirror 28 is retracted, behind the mirror 29, and has a pair of apertures arranged in a direction perpendicular to the plane of the drawing with an interval that can ensure focusing accuracy. Three
1 and a pair of re-imaging lenses 33, which are respectively arranged behind the aperture stop 31 having a pair of apertures and are arranged in a direction perpendicular to the paper surface, and a bundle of light beams emitted from the re-imaging lens 33. And a focus detection system II including a light receiving element 35 arranged at the image position. Re-imaging lens 32
The re-imaging lens 33 has the same magnification, but the pitch of the element rows of the light receiving elements 34 is smaller than the pitch of the light receiving elements 35.

According to this embodiment, during panoramic photography,
The mirror 28 is inserted in the optical path, and in the focus detection system I, among the light fluxes emitted from the taking lens 1, passing through the planned image forming surface 2 of the taking lens 1, passing through the condenser lens 3, the mirror 2
The light flux reflected at 8 passes through the re-imaging lens 32 and is focused on the light receiving element 34 as secondary images I _P1 and I _P2 .
Further, during normal shooting, the mirror 28 is retracted from the optical path, and the focus detection system II when the mirror 28 is retracted is
Of the light flux emitted from the photographing lens 1, transmitted through the planned image forming surface 2 of the photographing lens 1, and passed through the condenser lens 3, the light flux reflected by the mirror 29 passes through the re-imaging lens 33,
Secondary images I _N1 and I _N2 are formed on the light receiving element 35.

As described above, by interlocking with the switching from the normal size to the panoramic size and reducing the bite of the light receiving element array, the focusing accuracy can be increased and the distance measuring range can be narrowed.

Although the phase correlation method is used in this embodiment, the contrast method can also be used. Further, instead of the mirror retractable from the optical path, an optical system for bending the optical axis may be used, and the position may be brought after the re-imaging lens. Further, the light receiving element itself may be moved and switched. Also,
By providing three or more light receiving elements, panorama switching and other trimming photography can be supported. Further, instead of the retractable mirror, an optical path splitting member such as a half mirror is used, and at the time of normal photographing, from the light receiving element 35,
You may make it read from the light receiving element 34 at the time of panoramic photography. Of course, it is also possible to enhance the effect by sharing it with a re-imaging lens having a different magnification.

(Seventh Embodiment) In the seventh embodiment, the focus detection accuracy is improved and the distance measuring range on the image pickup surface is narrowed by the input means of the information about the image range and the information about the image range. With a focus detection device capable of magnetism, light, or
An image capturing apparatus is composed of a silver salt film, a magnetic tape, or an image storage medium such as a floppy disk capable of storing trimming information by mechanical means.

When the photographer wants to perform trimming at the time of photographing or to perform trimming at the time of reproducing an image, information regarding the range of the image to be reproduced is transmitted to the photographing apparatus from the input means of this information. Next, the photographing apparatus sets the focus detection accuracy and the distance measurement range based on the input information regarding the range of the image to be reproduced, and performs photographing. As the focus detection device used at this time, for example, the so-called phase difference focus detection device of the first embodiment is used.

The photographed image information is stored in the image storage medium, and the trimming information is stored in the image storage medium. The image information stored in the image storage medium is
Only the part to be trimmed or all the parts may be trimmed. Figure 1
As shown in FIG. 5, for example, when the image storage medium is the silver salt film 40, the image information 41 is stored by exposure,
A method of storing trimming information 42 by an exposure pattern or the like between this stored image information and the next image information, or as shown in FIG. 16, expose one or both outside the exposure range of the image information 41. There is a method of storing the trimming information 42 by mechanically making a hole in the film or the like, and a method of magnetically storing the trimming information using a film having a magnetic material applied to the entire surface or a part thereof. Also,
When the image storage medium is a magnetic tape or a floppy disk, the trimming information may be stored as magnetic information between the image information and the image information, or may be mixed in the image information. Then, according to the stored trimming information,
Image information is reproduced by printing paper or printer. In this case, the method of transmitting the trimming information to the image reproducing means is as follows.
It may be ON-LINE or OFF-LINE.

Further, in the case of a photographing device capable of designating a plurality of trimming sizes, the focus detecting device is switched
The switching may be performed with a certain trimming size as a boundary, or the re-imaging optical system may be a zoom type and the magnification may be continuously changed.

Further, the focus detecting device to be used is not limited to the phase difference type focus detecting device, and a contrast type or an infrared active type may be used.

(Eighth Embodiment) An eighth embodiment is an input means for inputting information on the range of an image to be reproduced, and a focus detecting device for setting the focus detection accuracy and the range-finding range based on the information on the range of the image to be reproduced. , A silver salt film, a magnetic tape, or an image storage medium such as a floppy disk capable of storing information of the range of an image reproduced by magnetic, optical, or mechanical means.

The photographer transmits the information of the range of the image to be reproduced to the photographing device by the input means. Next, the shooting device
A predetermined setting is made in the image storage medium based on the inputted information of the range of the image to be reproduced, the focus detection accuracy and the distance measuring range are set, and photographing is performed. The predetermined setting on the image storage medium will be described by taking a silver salt film as an example. When using so-called Leica film, the range of images that can be reproduced is
In the vertical direction, the length can be set only up to 24 mm, but in the horizontal direction, the length that can be set is determined by the restrictions of the photographing apparatus itself. For example, when setting a range of an image to be reproduced shorter than usual in the horizontal direction, light is shielded so that only the length thereof is exposed, and the film winding amount is also adjusted to the range of the image to be reproduced. Further, when setting a range of an image to be reproduced longer than usual in the horizontal direction, the exposure is divided into two.
That is, as shown in FIGS. 17A and 17B, the taking lens 43 is shifted in the direction opposite to the winding direction of the film 40 to perform the first exposure, and then is shifted in the winding direction of the film 40. Then, the second exposure is performed. The focus detection device used at this time may be any of the above embodiments.

The photographed image information is stored in the image storage medium, and the information of the range of the image to be reproduced is further stored in the image storage medium. This storage method may be the method shown in the seventh embodiment. Then, in accordance with the stored information of the range of the image to be reproduced, the image information is reproduced by a photographic printing paper, a printer or the like. In this case, the method of transmitting the trimming information to the image reproducing means is ON-LINE or OFF-LINE.
However, in the case of ON-LINE, for example, in the case of a Leica-format film, the feed amount of the film can be automatically set.

As shown in FIG. 17, when the photographing lens 43 is shifted, the photographing lens 43 may be tilted based on the focus detection result. Alternatively, the imaging device itself may be shifted in association with the platform or the like. In this case, it is desirable that the absolute position of the taking lens does not change.

Although the focus detection device and the autofocus type photographing device of the present invention have been described above based on some embodiments, the present invention is not limited to these embodiments and various modifications can be made.

[0076]

As is apparent from the above description, according to the focus detecting apparatus of the present invention, the focusing accuracy is increased and the distance measuring range is narrowed when the trimming photographing such as the panorama size is set. Focusing accuracy can be made better than in normal size shooting, the range can be reduced, and a TTL-phase-difference AF system optimal for a camera capable of trimming shooting such as a camera for both normal size and panorama size can be configured. .

Further, according to the automatic focusing type photographing apparatus of the present invention, when the range of the image to be reproduced is set, the appropriate focus detection accuracy and the range-finding range on the image are set in view of the image quality and the ease of photographing. However, by storing the range of the image to be reproduced in the image storage medium, it is possible to reproduce a good quality image regardless of the range of the image to be reproduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a focus detection device according to a first embodiment of the present invention is arranged on the bottom of a single-lens reflex camera body.

FIG. 2 is an optical path diagram showing a panoramic size focus detection system in the first embodiment.

FIG. 3 is an optical path diagram showing a normal size focus detection system in the first embodiment.

FIG. 4 is an optical path diagram showing a panoramic size focus detection system in a second embodiment.

FIG. 5 is an optical path diagram showing a normal size focus detection system in a second embodiment.

FIG. 6 is an optical path diagram showing a panoramic size focus detection system in a third embodiment.

FIG. 7 is an optical path diagram showing a normal size focus detection system in a third embodiment.

FIG. 8 is an optical path diagram showing a panoramic size focus detection system in a fourth embodiment.

FIG. 9 is an optical path diagram showing a normal size focus detection system in a fourth embodiment.

FIG. 10 is an optical path diagram showing a panoramic size focus detection system in a fifth embodiment.

FIG. 11 is an optical path diagram showing a normal size focus detection system in a fifth embodiment.

FIG. 12 is a diagram showing the aperture shape of the aperture stop in the fifth embodiment.

FIG. 13 is a sectional view similar to FIG. 1 in a sixth embodiment.

FIG. 14 is an optical path diagram showing an optical system of a sixth example.

FIG. 15 is a diagram showing a positional relationship between image information and trimming information stored in a seventh embodiment.

FIG. 16 is a diagram showing another positional relationship between stored image information and trimming information.

FIG. 17 is a diagram showing a state of double exposure in the eighth embodiment.

FIG. 18 is an optical path diagram for explaining the principle of the phase difference method.

FIG. 19 is an optical path diagram in a state in which an image is formed on a planned image forming surface for explaining the principle of the contrast method.

FIG. 20 is an optical path diagram in a front focus state in the contrast method.

FIG. 21 is a diagram showing a landscape when a person-centered commemorative photo is taken against a background of mountains.

[Fig. 22] Fig. 22 is a diagram showing a shooting range in the case of shooting a person in a normal size with a focus on a person.

FIG. 23 is a diagram showing a shooting range when shooting a person in a panoramic size.

FIG. 24 is a diagram showing a range exposed on a film during panorama size photography.

[Explanation of symbols]

 1 ... Photographing lens 2 ... Planned image forming surface 3 ... Condenser lens 5, 28, 29 ... Mirror 6, A1, A2, 30, 31 ... Brightness diaphragm 7, 10, 11, 12, 13 ... Separator lens 8 ... Light receiving element Row 9 ... Conversion lens 14, 15, 32, 33 ... Re-imaging lens 16 ... Half mirror 17, 18 ... Photoelectric conversion element group 34, 35 ... Light receiving element 40 ... Silver salt film 41 ... Image information 42 ... Trimming information 43 ... Shooting lens A3 ... circumscribed circle

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location 7316-2K G03B 3/00 A

Claims (4)

[Claims] 1. A photographing optical system, a photoelectric conversion unit including a photoelectric conversion element array that receives a light flux that has passed through the photographing optical system, and a light flux, the photographing optical system being provided in a photographing apparatus having a trimming unit that enables trimming photographing. In the focus detection device having a re-imaging optical system for guiding focus to the photoelectric conversion means and performing focus detection, when the exposure range of the photographing surface is changed from one state to another state by the trimming means, focusing accuracy is improved. Is set to a different state, and when the exposure range of the photographing surface is narrow, the focus detection apparatus is provided with a focus accuracy setting unit that sets the focus accuracy to a higher state. 2. A photographic optical system, a photoelectric conversion means comprising a photoelectric conversion element array for receiving a light flux that has passed through the photographic optical system, and a light flux, the photographic optical system being provided in a photographic device having a trimming means for enabling trimming photography. In the focus detecting device having a re-imaging optical system for guiding focus to the photoelectric conversion means and performing focus detection, when the exposure range of the photographing surface is changed from one state to another state by the trimming means, distance measurement is performed. A focus detection apparatus comprising distance measuring range setting means for setting the range to be set to a different state and setting the range for distance measurement to be narrow when the exposure range of the photographing surface is narrow. 3. The absolute value of the magnification of the re-imaging optical system is increased according to the setting of the trimming means for narrowing the exposure range of the photographing surface. 2. The focus detection device described in 2. 4. An input unit for inputting information relating to a range of reproduction of a photographed image, a focusing precision setting unit for setting the focusing precision to a different state according to the information from the input unit, or a range for distance measurement. A focus detection device having distance measuring range setting means for setting different states, and means for storing information regarding a reproduction range of an image captured on the basis of information from the input means in an image storage medium An auto-focusing type imaging device characterized in that.