JPH0359633A - Camera system - Google Patents

Abstract

PURPOSE:To reduce the size of the camera system by providing a 1st and a 2nd photography system independently and forming selectively a subject image on one image formation plane through the 1st photography system and a subject image on the other image formation plane through the 1st and 2nd photography systems. CONSTITUTION:The camera system is equipped with a 1st image pickup means which forms the subject image on the 1st image formation plane 103 by converting luminous flux passed through the 1st photography system 101 through a rotatable mirror M1.5 and reforms the image on the 2nd image formation plane 17 by a secondary image formation system 104 through a mirror M2.15. Further, the system is equipped with a 2nd image pickup means which puts the mirror M2.15 off the optical path and forms the subject image on the 2nd image formation plane 17 by the 2nd photography system 102 independent of the 1st photography system 101. Then the mirror M1.5 is put off the optical system of photography in a 1st zoom range from the wide-angle end of the 1st photography system 101 to a specific zoom position and the 2nd photography means is used. In a 2nd zoom range to the telephoto end, the mirror M1.5 is put on the optical path of photography and some lens groups of the 2nd photography system 102 are moved on the optical axis, the mirror M2.15 is mounted, and the 1st image pickup means is used. Consequently, the system is reduced in size on the whole.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a camera system, for example, film and CC.
When forming a subject image on each of the two photosensitive surfaces (imaging surfaces) of D using a photographing system having a variable magnification section, the two image forming surfaces are The present invention relates to a camera system suitable for photographic cameras, video cameras, still video cameras, etc., in which a formed subject image is arbitrarily selected and used.

(Prior art) Conventional methods in which image information related to a subject image formed by a photographing system is recorded in a recording means and then reproduced and the image information is observed are subject to significant differences due to differences in the image information recording means. It is classified into two types.

One of these uses silver halide film as a recording means,
This is a film recording and reproducing method in which a subject image is formed by a photographing system on the surface of the silver halide film, and after the film is subjected to a development process, the image information is reproduced on the printed surface and observed.

The other method is to form an image of the subject using a photographing system on the surface of a charging conversion means such as a COD, convert the image information into an electrical signal, and then
This is an electrical recording method in which predetermined electrical processing is performed and images are reproduced and observed on a display means such as a CRT or television.

The former film recording reproduction method has the characteristics that the photographing system used can be configured to be compact and portable, and because the film has good resolution, the reproducibility of image information is good and it is suitable for recording as snapshots. be.

In the latter electric recording reproduction method, the reproduced image information is a moving image, and the effective surface of the photoelectric conversion means is smaller than that in the film recording reproduction method, so the entire photographing system is relatively compact, and the electric image Since processing can be performed arbitrarily, desired image information can be easily displayed on the surface of the display means.

(Problems to be Solved by the Invention) The film recording reproduction method has the problem that the reproduced image is a still image, and also requires a development process and lacks immediacy.

On the other hand, in the electrical recording reproduction method, the number of pixels in the charge conversion means is small, and the quality of the image information obtained is not necessarily sufficient.For example, when enlarging one screen of image information as a still image, the magnification rate is limited. There is a problem with this.

On the other hand, a camera system can be considered that integrates a photo camera using film and a video camera using CCD etc. and selectively uses both, but simply integrating both would result in a large camera system as a whole. The problem arises that portability deteriorates.

In particular, if a zoom lens is used as the photographing system and two zoom lenses are arranged side by side, the problem arises that the entire camera system becomes complicated and large.

In the present invention, a first J11 shadow system and a second imaging system are provided independently, and a subject image by the first imaging system is transferred to one imaging plane (for example, a film plane) to another imaging plane (for example, a CCD plane). In this method, the object image is formed selectively by both the first and second photographing systems depending on the purpose (for example, depending on the focal length of the photographing system), thereby making the entire camera system more compact and portable. The purpose of the present invention is to provide a camera system that can arbitrarily select and use image information regarding a subject image formed on two imaging surfaces (for example, a film surface and a CCD surface) while maintaining good image quality. .

(Means for Solving the Problems) The camera system of the present invention is the first I! The light flux that has passed through the shadow system is focused through a rotatable mirror M1 to form a subject image on a first imaging plane, and the subject image on the first imaging plane is focused by a secondary imaging system. A first means for re-imaging on a second imaging plane via a mirror M2 interlocking with the mirror M1, and a second photographing system provided independently of the first imaging system directing the mirror M2 as an optical path. a second imaging means retracted from inside and configured to form a subject image on the second imaging plane;
The photographing system has a variable magnification section in which the back focus is longer at the telephoto end than at the wide-angle end, and in the first zoom range from the wide-angle end of the first photographing system to a predetermined zoom position, the mirror M1 is At this time, the second photographing means is used, and in the second zoom range from the predetermined zoom position of the first photographing system to the telephoto end, the mirror M1 is moved out of the photographing optical path. The first imaging means is used by attaching the mirror M2 to the mirror M2 and moving a part of the lens group of the second imaging system above the optical frame, and attaching the mirror M2 to the space created at that time. There is.

(Embodiment) FIGS. 1(^) and 1(B) are schematic views of the main parts of the optical system of the first embodiment of the camera system of the present invention. The figure (A) shows the case where the first photographing system 101 is composed of a zoom lens and its focal length is at the short focal length S (wide-angle end), and the figure (B) shows the case where the first photographing system 101 is composed of a zoom lens and has a long focal length. (telephoto end) zoom position is shown.

In FIG. 2A, a first photographing system 101 collects a light beam 21 from an object (not shown) to form an image of the object on a photosensitive surface 4 such as a film. The second photographing system 102 has a variable magnification section, which collects a light beam 20 from an object (not shown) and forms the object image on an M2 imaging surface 17 such as a CCD, which has a smaller effective area than a film. is forming.

FIG. 2B shows light rays forming a subject image on a first imaging surface 103 optically equivalent to the photosensitive surface 4 via the mirror 5.

In this embodiment, the first imaging system 101 includes an A1 group 1 having a negative refractive power, an A2 group 2 having a positive refractive power, and an A1 group 2 having a negative refractive power.
It has three lens groups, 3 groups, and each of the three lens groups is moved toward the object side as shown by the arrow when changing the power from the wide-angle end to the telephoto end. As shown in FIGS. 1A and 1B, the lens is configured such that the back focus is longer at the telephoto end than at the wide-angle end. In the numerical examples described later, the focal path 111f=35.78 to 107
mm, and the angle of view is 62.3° to 22.86°. SP, S
Q is an aperture stop.

Reference numeral 7 denotes a mirror, which guides the light flux from the photographing system 101 to the autofocus section 8. The autofocus unit 8 includes, for example, a focus detection device using a known image shift method.

Reference numeral 5 denotes a rotatable mirror (Ml), which is rotated about a rotation fulcrum 6 in the direction of an arrow 6a.

9 is a field lens, which forms the first image in its vicinity;
03, a subject image is formed by the photographing system 101.

to, ts are lens groups, and these lens groups 10.
16 constitutes a secondary image formation f-104, and the subject image formed on the first image formation surface 103 is transferred to a fixed mirror 11.
12 and a movable mirror 15, the image is re-imaged at a predetermined magnification onto a second imaging surface 17 made of a CCD.

Reference numeral 15 denotes a rotatable or slidable mirror, which is rotated in the direction of arrow 15b about a rotation fulcrum 15a.

102 is a second wL shadow system, which is provided independently of the first imaging system 101, and includes lens groups 18°, 19.13.
14, an aperture stop SQ, and a relay section 1.
It consists of 6. FIG. 2A shows a case where the second photographing system 102 is on the wide-angle side corresponding to the zoom position of the first Jli shadow system 101.

In the same figure (A), the optical path forms an object image on the photosensitive surface 4 by the first imaging system 101, and the second imaging means forms the object image on the second imaging surface 17 by the second imaging system 102. The optical path is shown as follows.

In the same figure (B), a subject image is formed on the first image forming body 103 via the mirror 5 by the photographing system 101, and '! The object image on the J1 imaging plane 103 is formed into a secondary image with the field lens 9,
%104 is used to show the optical path as the first imaging means re-imaged on the secondary imaging plane 17-[.

In the present embodiment, when the camera system is used as a short focal length photographing system as shown in FIG. 2A, mirror 5 and mirror 15 are retracted out of the photographing optical path as shown in the same figure.

The first imaging system 101 and the second imaging system 102 are each configured independently.

That is, in FIG. 2A, the light beam passing through the first photographing system 101 is condensed to form a subject image on the photosensitive surface 4. At this time, the first photographing system 101 is within the first zoom range of focal length f=35.78 to 55 mm in numerical examples described later. Incidentally, at this time, the mirror 7 is retracted out of the #11 shadow optical path.

At this time, at the 24th hj, the imaging means uses the second photographing system 102 to form an image of the subject on a second imaging device 17 made of a CCD. The focal length 111f of the second photographing system 102 is COD
If the effective diameter of is 8 mm, then f is in the range of 6.61 to 10.17. Then, the image information is converted into an electrical signal, and the image is reversed vertically, horizontally, etc., and is used, for example, in an electronic viewfinder.

In this embodiment, when the first imaging system 101 is on the short focal length side,
In other words, when the first zoom range is from the wide-angle end to the standard
The camera system is configured such that a subject image is formed on both the film surface of the imaging surface and the CCD surface of the second imaging surface.

Next, in this embodiment, when the first photographing system 101 is used as a photographing system for a long focal length range, that is, a second zoom range from standard to telephoto, each lens group of the photographing system 101 shown in FIG. The A3 lens group 3 is extended toward the object side, and a mirror 5 is mounted in the space created at that time, as shown in FIG. 5(B).

Further, in conjunction with the zooming operation of the first imaging system 101 from the wide-angle end to the intermediate zoom position, the zooming unit of the second imaging system 102 is moved toward the object side to change the magnification, and the zooming unit lens at that time is moved toward the object side. group and open
A mirror 15 interlocking with the mirror 5 is rotatably mounted in the space created between the first aperture SQ and the second aperture SQ.

At this time, the first photographing system 101 is used in a second zoom range with a focal length of 11155 to 107 mm in numerical examples described later. A rotatable mirror 5 is mounted in the optical path, and a mirror 15 is rotated and arranged as shown by the solid line.

Then, as shown in FIG. 1(B), a subject image is formed by the first photographing system 101 on the first imaging plane 103 via the mirror 5. The object image formed on the first image forming system 103 is re-imaged on the second image forming system 17- via the field lens 9 and the secondary imaging system 104. At this time, the second imaging means is not used. Incidentally, at this time, the mirror 15 also functions to block the incident light flux from the second photographing system 102.

When the object image by the first photographing system 101 is exposed onto the photosensitive surface 4, the mirror 5 is retracted from the optical path and a shutter means (not shown) is opened and closed.

In this embodiment, when the first photographing system 101 is in the second zoom range with a long focal length, the camera is capable of selectively focusing the object image on the film surface or one of the CCD surfaces. configuring the system.

In addition, in this embodiment, a secondary imaging system is used to separate the first imaging plane and the second imaging plane.
The magnification relationship between the image forming surface and the first image forming surface is made to satisfy the angle of view of the first image forming surface, thereby maintaining the relationship between both angles of view.

In this embodiment, the central part of the mirror 5 is a half mirror.
The light beam may be guided to the autofocus section 8 via the mirror 7.

Also, in this embodiment, instead of the mirror 12 and the mirror 15, a slope 105a is used as shown in FIG.

Consisting of a prism body 105 with 105b as a reflective surface,
The first H&imaging means (first zoom range) and the second imaging means (second zoom range) may be attached to and removed from the optical path by sliding as shown by arrow 106. If such a prism body 105 is used, assembly and adjustment can be facilitated, and focus adjustment of the second imaging plane can also be performed. or,
It is preferable to use the refractive surface 107 as the exit surface of the prism body 105 because adjustment becomes easier.

As described above, in this embodiment, even if the first photographing system 101 is composed of a zoom lens with a high zoom ratio, the back focus may be short in the first zoom range, and the entire lens system can be easily miniaturized. It has the advantage of being able to

In addition, the second photographing system 102 does not require as much zoom ratio as the first photographing system 101, and can perform the first photographing in the first zoom range when the mirror 5 shown in FIG. 1(A) is retracted from the optical path. The zoom ratio may be approximately the same as the zoom ratio of the system 101.

For example, if the zoom ratio of the first imaging system 101 is 4 to 5 times and the first zoom range is 2 times, the zoom ratio of the 21st shadow system 102 can be configured to be about 2 times. This “Ib, 2nd
The imaging system 102 can be configured to be extremely compact.

In addition, by appropriately setting the secondary imaging system 104, the subject image formed on the first imaging plane 103 can be re-imaged on the second imaging plane 17 at an arbitrary magnification.

In particular, if the secondary imaging system 104 is composed of a zoom lens, it is possible to continuously re-image at any magnification. Also second
The zoom magnification on the imaging plane can be made larger than the zoom magnification on the first imaging plane.

Next, a numerical example of the first imaging system of this embodiment will be shown. In the numerical examples, Ri is the radius of curvature of the i-th lens surface from the object side, Di is the thickness and air gap of the i-th lens from the object side, and Ni and νi are the curvature radius of the i-th lens from the object side, respectively. These are the refractive index and Atsube number of glass. bf is back focus.

The aspherical shape has an X-axis in the tip direction and a HIl in the direction perpendicular to the optical axis.
ith, the traveling direction of the light is positive, R is the paraxial radius of curvature, A,
When B, C, D, and E are each aspherical coefficients, 10 DH8+ EH” 10...+ A'H
+ B'H3+ C'H'10 D'H'+
It is expressed by the formula: E'119+...

Further, for example, the display "rD-x" means No-J.

Numerical Example F-35,78 ~107 ++ +・-105,! i0 12- 12.25 113- 22.77 1(4. ++ 9, 83 II 5- 41.72 It 6--58.47 117- 17.08 1+ 8- 86.35 It 9= -54,28 Old 0・20.02 Old】-:]7.6+ 1112・-27,42 1(13-Aperture old 4--30.00 1t15=-16,25 1(16・-70,84 1117--71 , 15 FNo-1: 2.8 ~ 6.5 DI-1,97 D 2- 0.56 D 3- 3.11 D4・Variable D 5= 3.20 D 6- 0.20 D 7- 3 .29 D 8- 1.93 D 9- 3.14 DIo・ 0.79 D11~4.32 012- 1.64 D13- Variable Di4- 4.81 Di5・ 3.26 Di6 174 N 2ω-62, 30 ~22.860 1-1.72000 ν 1-50.22-1.88
893 2-31.1 3-1.57135 3-53.0 4-1.57135 4-53.0 5-1.84666 5-23.9 8893 6-31.1 7-1.6889: ] 7 -31.1 8-1.66672 8-48.3 2.978D-5 -6,9430-6 -2,6610-8 4,975D-11 -2,9050-13 A' -5,4:14D -8 B゛8.9880-8 C゛-5,2980-10 D゛2.2490-12 116 -1.497D-2 -5,9380-5 -1,3560-8 -5,547D-10 4 , 7710-12A.

2.1580-5 B' 7.6970-7 C.

-2,059D-8 D.

1.5510-1゜3.289D-1:1 1.8700-15 1 8.2910-19 (Effect of the invention) According to the present invention, there are two imaging planes, namely the film plane and the CCD.
It is possible to selectively focus the subject image using one zoom lens on both sides, and since one zoom lens is smaller compared to a camera system with two independent zoom lenses, the overall system size is reduced. It is possible to achieve a camera system that can be miniaturized and that can selectively use image information from two independent imaging planes.

As a result, for example, when video shooting is normally performed using the COD on the second imaging plane, image information that you want to leave as a print can be acquired by rotating the mirror when using the first imaging means, or by rotating the mirror when using the second imaging means. When in use, a camera system with a simple configuration that can easily form an image on the film surface of the first imaging surface can be achieved.

[Brief explanation of drawings]

1(A) and 1(B) are schematic diagrams of essential parts of an optical system according to one embodiment of the present invention, and FIG. 2 is a schematic diagram of a portion of FIG. 1(A) of another embodiment. In the figure, 101 is the first imaging system, 102 is the second imaging system, and 10
3 is a first imaging surface, 104 is a secondary imaging system, 4 is a photosensitive surface, 5
is a mirror M1.7 is a mirror, 8 is an autofocus section,
9 is the field lens, 15 is the mirror M2. 17 is the second
Image plane, 11°! 2 is a mirror.

Claims (2)

[Claims] (1) Mirror M that can rotate the light flux that has passed through the first imaging system
1 to form a subject image on a first imaging plane;
a first imaging means for re-imaging a subject image on the first imaging plane onto a second imaging plane via a mirror M2 interlocking with the mirror M1 by a secondary imaging system; and the first imaging system. The mirror M2 is removed from the optical path by a second imaging system provided independently from the mirror M2,
and a second imaging means configured to form a subject image on the second imaging plane, and the first imaging system has a variable magnification unit that has a longer back focus at the telephoto end than at the wide-angle end. In the first zoom range from the wide-angle end of the first photographing system to a predetermined zoom position, the mirror M1 is retracted out of the photographing optical path, and at this time, the second photographing means is used or The first
In a second zoom range from a predetermined zoom position of the photographing system to the telephoto end, the mirror M1 is mounted in the photographing optical path, and a part of the lens group of the second photographing system is moved on the optical axis;
The mirror M2 is mounted in the space created at that time, and the first
A camera system characterized by using an imaging means. (2) The second photographing system has a variable magnification section, an aperture diaphragm, and a relay section in order from the object side, and when at least a part of the lens group of the variable magnification section is moved toward the object side on the optical axis, 2. The camera system according to claim 1, wherein the mirror M2 is mounted in a space created between a lens group and an aperture stop.