JPH0359634A - 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 a subject image on one image formation plane through the 1st photography system and a subject image on the other image formation plane through both the 1st and 2nd photography systems selectively. 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 movable reflecting member 15. Further, the system is equipped with a 2nd image pickup means which puts the reflecting member 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; and the mirror M1.5 is put on the optical path of photography, the reflecting member 15 is mounted on the optical path, and the 1st image pickup means is used in a 2nd zoom range to the telephoto end. 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 cameras.
When forming subject images on the two photosensitive surfaces (imaging surfaces) of D using a photographing system having a variable magnification section, the images are formed on the two image forming surfaces in accordance with the focal length range of the photographing system. The present invention relates to a camera system suitable for photographic cameras, video cameras, still video cameras, etc., in which a subject image can be 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 exposed to a developing process, the image information is reproduced on the printed surface and observed.

The other method is to form a subject image using a photographing system on the surface of a light weight conversion means such as a CCD, convert the image information into an electrical signal, and then
This is an electrical recording method that performs predetermined electrical processing and reproduces and observes images on a display means such as a CRT or television.

In the former film recording reproduction method, the shooting system used is small and portable; Since it can be constructed with good IF performance and the resolution of the film is good, it has good reproducibility of image information and is suitable for recording as a snapshot.

In the latter electrical recording reproduction method, the reproduced image information is a moving image, and the effective area of the charge conversion means is smaller than that in the film recording reproduction method, so the entire photographing system is relatively compact, and the electric image It has the characteristics that processing can be performed arbitrarily, and 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, there is a problem in that the enlargement magnification is limited.

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 first lens system and two zoom lenses are arranged side by side, the problem arises that the entire camera system becomes complicated and large.

The present invention provides a first imaging system and a second imaging system independently,
The subject image captured by the first imaging system is displayed on one imaging plane (for example, the film plane), and the object image captured by the first imaging system is displayed on the other imaging plane (for example, the CCD plane).
By selectively forming a subject image by both the photographing system and the second photographing system according to the purpose (for example, depending on the focal length of the photographing system), the overall camera system can be made compact and portable. The purpose of the present invention is to provide a camera system that can arbitrarily select and use images +/i-information related to a subject image formed on two imaging planes (for example, a film plane and a CCD plane) while maintaining .

(Means for Solving the Problems) The camera system of the present invention collects the light flux that has passed through the first Ji shadow system via a rotatable mirror M1 to form a subject image on a first imaging plane. 5. A movable reflecting member M that moves the subject image on the first imaging plane by a secondary imaging system and interlocks with the mirror M1.
a first imaging means for re-imaging on a second imaging plane via 2;
and a second imaging means configured to retract the reflecting member M2 out of the optical path by a second imaging system provided independently of the first imaging system to form a subject image on the second imaging plane. However, the first photographing system has, in order from the object side, at least an A1 group with a negative refractive power and an A2 group with a positive refractive power, and a variable magnification section that has a longer back focus at the telephoto end than at the wide-angle end. The second imaging system has, in order from the object side, at least an 81st group with a negative refractive power and an 82nd group with a positive refractive power, and the second imaging system has at least an 81st group with a negative refractive power and an 82nd group with a positive refractive power. In the first zoom range up to the zoom position, the mirror M1 is retracted out of the photographing optical path, and at this time, the second photographing means is used, and from the predetermined zoom position of the first photographing system to the telephoto end. In the second zoom range up to, the mirror M1 is installed in the photographing optical path, and the reflecting member M2 is installed in the optical path, so that the first imaging means is used at this time. .

(Embodiment) FIGS. 1A and 1B are schematic diagrams 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 (wide-angle end), and the figure (B) shows the case where the first photographing system 101 is composed of a zoom lens with a long focal length fi. (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. Further, the second photographing system 102 has a variable magnification section, and collects a light beam 20 from an object (not shown) onto a second image forming surface 17 such as a CCD, which has an effective surface IJ''t smaller than that of the film. The image of the subject is formed.

FIG. 2B shows light rays forming an object image on a first image forming body 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. This facilitates widening the angle of view. As shown in Figures (A) and (B), the lens is constructed so that the back focus is longer at the telephoto end than at the wide-angle end. In numerical examples described later, the first imaging system 101 has a focal length 11if=40.64 to 15
1.91 mm, and the angle of view is 56.1° to 16°2°.

SP and SQ are aperture stops.

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, and the first imaging plane 1 near it is
03, a subject image is formed by the photographing system 101.

10.16 are lens groups, and these lens groups 1
0.16 constitutes a secondary imaging system 104, and the subject image formed on the first imaging surface 103 is transferred to a fixed mirror 11 (
M2) and a movable reflecting member 15 are used to re-image the image at a predetermined magnification onto a second image forming unit 17 consisting of a CCD.

Reference numeral 15 is a reflective member that can slide, and slopes 15a, I
It consists of a prism body with Sb as a reflective surface, and the arrow 15c corresponds to switching between the first imaging means and the second imaging means.
It moves like this and is attached and detached in the optical path.

102 is a second imaging system, which is provided independently from the first imaging system 101, and includes an 81st group 18 with negative refractive power, an 82nd group with positive refractive power, and a 82nd group with negative refractive power. 83 group 13
A variable magnification unit consisting of a variable magnification unit, an aperture SQ, and a relay unit 1
6.

Note that 22 is a filter-related member.

In FIG. 1(A), the second shooting f8toz is the same as the first shooting f8toz. A case on the wide-angle side corresponding to the zoom position of the 1-3 system 101 is shown.

In numerical examples described later, the second imaging system 102 has a focal length f
=7.58~14.4mm, angle of view ω=56.6°~31
It is Q.

In the figure (A), a first photographing system 101 forms an object image on the photosensitive surface 4 through an optical path, and a second photographing system 102 forms a second image forming object image on a second imaging device 17. The optical path is shown as follows.

In the same figure (B), a subject image is formed on a first image plane 103 via a mirror 5 by a photographing system 101, and a subject image is formed on a first image plane 103.
The subject image on 3 is transferred to a field lens 9 and a secondary imaging system 10.
4 shows the optical path between the first image pickup means and the second image pickup means 17, which is re-imaged on the secondary image forming apparatus 17.

In this embodiment, when the camera system is used as a short focal length photographing system as shown in FIG. 2A, the mirror 5 and the reflecting member 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 Ill shadow 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=40°63 to 66.53 mm in a numerical example to be described later. Incidentally, at this time, the mirror 7 is retracted out of the photographing optical path.

At this time, the second imaging means uses the second imaging system 102 to form a subject image on a second imaging plane 17 made of a CCD. 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, the first photographing system 101 has a long focal length 11
1iT! , # of the second zoom range from standard to telephoto! When used as a shadow system, each lens group of the m-shadow system 101 in FIG.
), a mirror 5 is attached.

Also, in conjunction with the zooming operation of the first imaging system 101 from the wide-angle end to the intermediate zoom position, the zooming section of the 281st shadow system 102 is moved to change the zoom, and the reflecting member 15 is placed in the space created at this time. is inserted.

At this time, the first photographing system 101 is used in the second zoom range of the focal path 71166.53 to 151 degrees and 91 mm in the numerical examples described later. As shown in FIG.
It is arranged in the optical path as shown in B).

As shown in the figure, a subject image is formed by the first imaging system 101 via the mirror 5 on the first imaging plane 103. The object image formed on the first imaging plane 103 is re-imaged on the second imaging plane 17 via the field lens 9 and the secondary imaging system 104. At this time, the second imaging means is not used. Note that at this time, a part of the reflecting member 15 also functions to block the incident light flux from the second imaging 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 first imaging plane and the first imaging plane is maintained so that the angle of view of the first imaging plane is satisfied.

In this embodiment, the secondary imaging system 104 maintains the magnification relationship of the imaging magnification β. Therefore, by inserting the mirror 5 and the reflecting member 15 into the optical path, the first imaging means can be moved to the second imaging plane 17.
Focal path II! 1f=7.58~28.08mm
range (angle of view) can be used continuously.

Here, the angle of view range of the first imaging system in Fig. 1(A) is 56.1
Since it is 0 to 16.2 degrees, it is within the range of the second imaging system.

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.

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 (9) 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 second imaging system 102 can be configured to be about 2 times. Therefore, the second imaging system 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.

Note that the first imaging system and the second t! The lens configuration of the shadow system is not limited to the types shown in FIGS. 1A and 1B, but may be any type of zoom lens.

2 and 3 show the second imaging system 102 of the present invention. FIG. 3 is a schematic diagram of an optical system of a third embodiment. In the second embodiment shown in Fig. 2, three lenses 18, 19, and 13 constitute a variable power section, and these lens groups are moved as shown by the arrows to change the power from the wide-angle end to the telephoto end. . In the third embodiment shown in FIG. 3, a lens group 18 having a negative refractive power and a lens group 1 having a positive refractive power
The two lens groups 9 are moved as shown by the arrows to change the magnification from the wide-angle end to the telephoto end.

Next, numerical examples of the first and second systems according to the present invention 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.

4l imaging system F-40,64FNo-1:3 ~+51.91 1t I--80,11 1+ 2- 29.54 11 3-:Jo, 97n 4th 257.00 11 5-]933. 61 1t 6- -4B, 78 R7-37,29 178 prisoners -43,+4 R9・-319,0:l R10・14.7! l 111! = 58.58 Old 2- Aperture old 3-166.77 1114- 14.41 1115- 26.49 Old 6--37.73 1117--52.47 +118--18.10 1119--17.55 01 ~1.50 D 21I 1.00 D 3- 4.00 D4- Variable D 5-2.73 06-0.16 07-3.21 D 8-1.07 D9 Wealth 0.16 DIO-3,78 D11~2.63 012-0.72 Di3-1.98 DI4= 1.25 015-2.73 Di6・Variable 017-3.00 Di8-2.44 019-1.20 ~9 2ω- 10~16 .2' 1-1.88300 1-40.8 2-1.75604 2-25.0 3-1.49700 3-81.6 4-1.5]742 5-1.84666 4-52.4 5-23.9 6-1.61700 6-62.8 7-1°83400 7-37.2 N 8-1.62045 8-38.1 9-1.59270 9-35.3 N10-1. 72916 C10-54.7 R2O- -61,72 D2〇- 26 21- -15,45 21- 1,2O N11-1.48749 v 11=70.2 22- 1:15.11 2nd imaging system F-7,58 ~14.4 RI--45,00 12-69,73 83-80,00 R4--70,0O R5-55,00 85--71,21 R7--35,00 88- 46,41 1st Example FNoJ: 2 l- 2- 03= D 4 5- 6- 7- 8- 1.80 Variable 3.00 0.20 3.00 Variable l, 80 Variable 2ω- 55,6゜l・1.69680 2・1.6!168Q 3・1.69680 4-1.516:13 Glaze 310 -55 2-55.5 3-55.5 4-64.1 1 (9- It I O- 1111 calculation 1112 ~ 1 (13・I4- 1115- RI fi 1+ 1117- Aperture 7, 5 fi -12,96 80 836 -9,28 09 calculation D1〇- 〇ll- 12- 013・DI4 book 15- 16- 1.00 1.92 1.08 1.08 0.54 2.16 1.08 6.48 5-1.77250 1i-1,805111 7-1,83400 8-1,5]5:13 5-49.5 6-25.4 -37 8/64.1 Swamp 2 Photography System 2nd Example F" 7.50 FNo-1: 2~15 II l--45,00D I-1,801+ 2 −
69.73 D 2- Variable 2ω~ 56.10 ~ 29.86' 1-1.69680 1=55.5 3- 14- 5- 6-7 - 9- RIO- 11- 12- R I 3- 14 - 15- 16- 17- 120, 00 -60.00 50, OQ 72, 47 -35.00 46, 41 Aperture 7, 48 12, 8:1 10, 69 18, 17 -9.19 3- 4- 5- 6- 7- D 8-0 9= D1〇- 〇 Low 12- 13- 14- 15- 16- 3, 00 0, 20 3, 00 Variable 1, 80 0, 8 0, 99 1, 90 1 , 0? 1,07 0,53 2, Mouth 1,07 6,42 2・1, 6'168Q 3-1.69680 4-1.5163:1 5-1.7725O N 6-1.80518 7・1.83400 8-1.51633 2-55.5 'l-55.5 4.64.1 5-49.5 6-25.4 7-37.2 8-64, 1 2nd fertilization system 3rd example F-7.52 FNoal: 2-12.
15 It lj -45.00 D I-R 2
- 91.13 0 2- R: 1- 80.00 0 3.1 (4 months -7
0.00 0 4-R 5= 55.0
0 0 5”11 6・-71.21
0 6・It 7- -35.00 D
7-+1 8- 46.41 D 8-R9-
D9・RIO- 6.110 010- 1111- co Dll- 1112--11.55 DI2- 111:l- 9.72 013-fl14-
16.52 014-1115・-fl. 36
015=1(16~■016-1(17~c.

l,80 1 exactly 3,00 0,20 3,00 variable l,80 1J change 0,90 1,72 0,97 0,97 0,49 1,94 0,! 17 5, 83 2ω- 1-1.69680 2-1.69680 3-1.69680 4・1.51633 5-1.77250 6~1.80518 7-1.83400 8-1.5163:1~36 .4' 1-55.5 2-55.5 3-55.5 4-64.1 -49 6-25.4 7-37.2 8-64.1 (Effect of the invention) According to the present invention Two imaging planes: film plane and CCD
A single zoom lens with a high zoom ratio can be used on both sides to selectively form a subject image, and one zoom lens is smaller than a camera system with two independent zoom lenses. As a result, the entire system can be miniaturized, and a camera system that can selectively utilize image information from two independent imaging planes can be achieved.

As a result, for example, video shooting is normally performed using the CCD on the second imaging plane, and 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]

1A and 1B are schematic diagrams of essential parts of an optical system according to an embodiment of the present invention, and FIGS.
The second part of the photography system. FIG. 3 is a schematic diagram of a lens system according to a third 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 the mirror M1.7 is the mirror 8 is the autofocus section,
9 is a field lens, 15 is a reflecting member, 17 is a second image forming surface, and 11 is a mirror M2.

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 surface onto a second imaging surface via a movable reflecting member M2 interlocked with the mirror M1 by a secondary imaging system; a second imaging means configured to retract the reflecting member M2 out of the optical path by a second imaging system provided independently of the first imaging system to form a subject image on the second imaging plane; The first imaging system includes, in order from the object side, at least an A1 group with a negative refractive power and an A2 group with a positive refractive power.
The second imaging system has a variable magnification unit with a longer back focus at the telephoto end than at the wide-angle end, and the second imaging system includes, in order from the object side, at least a B1 group having a negative refractive power and a B1 group having a positive refractive power. In the first zoom range from the wide-angle end of the first imaging system to a predetermined zoom position, the mirror M1 is retracted out of the imaging optical path; 2 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
A camera system characterized in that the reflecting member M2 is mounted in the photographing optical path and the reflecting member M2 is mounted in the optical path, so that the first imaging means is used at this time. (2) The second photographing system includes a variable magnification unit consisting of three lens groups, the B1 group, the B2 group, and the B3 group with negative refractive power arranged behind the B2 group, an aperture diaphragm, and a relay. The first imaging system and the second imaging system have substantially the same angle of view at the wide-angle end, and the focal length at that time is shorter than the effective screen of each imaging system. The camera system according to claim 1, characterized in that: