JPH0425827A - Trimming camera - Google Patents

Abstract

PURPOSE:To obtain a camera in which the distribution of a telephoto side and a wide side is well-balanced by allowing the camera which can generate trimming information for electronic zoom that only an image corresponding to the specified range of the image on a photographing medium which is formed by a photographing lens is magnified at the time of printing to satisfy a specified condition. CONSTITUTION:This camera is provided with a trimming information transmitting means 140 which generates the trimming information for electronic zoom that only the image corresponding to the specified range of the image on the photographing medium 160 which is formed by the photographing lens 150 is magnified at the time of printing. Then, the conditions expressed in inequalities are satisfied. It is assumed in the inequalities that fL: the longest focal distance of the photographing lens 150, fS: the shortest focal distance of the photographing lens 150, D: the diagonal length of the image frame of the camera equivalent to the diagonal length of film, and RfL and RfS: the longest and the shortest focal distances of synthesized focal distances corresponding to the synthetic zoom obtained by synthesizing optical zoom and the electronic zoom, RfM=(RfL+RfS)/2.

Description

DETAILED DESCRIPTION OF THE INVENTION 1.1 The present invention relates to a trimming camera, and more particularly to a trimming camera constituting a trimming system.

The trimming system uses information that specifies a predetermined range in the image forming area B of the film (50t), that is, a part of the area A including the center, as shown in FIG.
By imprinting it on a predetermined part (51t) of the emulsion surface, area A can be stretched out during printing to create the image shown in the same figure (b).
This system is capable of printing on area A' of photographic paper (52t) shown in FIG. Specifically, when shooting in trimming mode, trimming information in the form of a code signal is recorded by a code imprinting unit on a predetermined portion (51t) of the film, and when printing, this information is read by a reading device. , the printing device performs enlargement zooming according to that information. As shown in FIG. 25 (c), the trimming information is transmitted through optical fibers (53t) and (54
t) and (55t) to a predetermined portion (51t) of the film (50t), and the predetermined portion (51t) is exposed to light to be imprinted on the film (50t). Enlargement zooming using this trimming information is called "electronic zoom," and a camera compatible with such a trimming system will be called a "trimming camera."

On the other hand, when a photographic lens has a variable power function, the variable power of the photographic lens is called "optical zoom", and its focal length is f. Let's express it as 2.

Furthermore, the ratio of the image height of the area specified by electronic zoom to the image height (h) of the image formed by optical zoom is referred to as a trimming magnification (βε2).

Conventionally known trimming cameras capable of zooming using optical zoom and electronic zoom include, for example, optical zoom with a focal length of the photographing lens of 35 to 80 mm and electronic zoom with a maximum trimming magnification of 2.3x. (Refer to Japanese Patent Application Laid-Open No. 61-295534, etc.) and those capable of optical zoom with a focal length of the photographing lens of 28 to 80 mm and electronic zoom with a maximum trimming magnification of 2.5x (Japanese Patent Application Laid-Open No. 61-295534). 61-223831 etc.) are known.

By the way, the focal length of the standard photographic lens (so-called standard lens) for regular cameras is 50 mm for eye reflex (SLR) cameras, and 35 to 40 mm for lens shutter (LS) cameras, but we trimmed the focal length. In this case, it will inevitably have the same effect as shooting with a lens with a long focal length. As a result, it can be said that the above-mentioned normal photographic lens is in a state similar to that of an extremely telephoto lens, assuming that trimming is performed.

As a result, many shots are taken in telephoto mode, which results in many photos with high magnification of the main subject, making it difficult to take landscape photos or snapshots that include the surroundings other than the main subject. . As a result, there is a problem in that many of the photographs taken as described above are unnatural.

An object of the present invention is to provide a trimming camera that solves these problems.

In order to achieve the above object, the trimming camera of the present invention has an optical zoom function by zooming the photographic lens,
In addition, in a trimming camera that can generate trimming information for electronic zoom that enlarges only an image corresponding to a predetermined range of an image on a photographic medium formed by the photographic lens during printing, the following conditional expression (2) is satisfied. It is characterized by satisfying ■, ■, and ■.

fL/fS≦2 ・・・・・・■0, 5< f
s/D<0.69 --■RfL/RfS>
2.3 ・・・・・・■0゜8<Rfu/D
< 1.35...■Where, fL: The longest focal length of the photographic lens fS: The shortest focal length D of the photographic lens = Diagonal length of the camera's image frame corresponding to the diagonal length of the film RfL: The longest focal length RfS among the composite focal lengths corresponding to a composite zoom that is a composite of the optical zoom and electronic zoom: The shortest focal length among the composite focal lengths that correspond to a composite zoom that is a composite of the optical zoom and electronic zoom. Rfn=(RfL+RfS)/2.

After ensuring the minimum zoom ratio for a zoom lens using conditional formula (■) above, conditional formula (2) sets the focal length in the middle of the zoom range at the composite focal length to be equal to the standard focal length, that is, the diagonal length of the film screen. Make it close to the focal length. That is, by setting the intermediate value between the focal length RfS corresponding to the maximum angle of view and the focal length RfL corresponding to the minimum angle of view as the standard value of the lens, and bringing that value closer to the focal length of a general standard lens, Now you can use a zoom lens without feeling any discomfort compared to when you were using a 200mm lens.

Conditions (1) and (2) are necessary to make the optical zoom even closer to the short focal length and to create a zoom lens with relatively low magnification. Condition (■) A bright FNO zoom lens can be obtained with a simple lens configuration. If the lower limit of conditional expression (2) is exceeded, it becomes difficult to correct aberrations, and the number of lenses must be increased, making the configuration complicated. Furthermore, if the upper limit is exceeded, it becomes difficult to obtain a bright zoom lens with a simple configuration.

By keeping the zoom ratio within the range of conditional expression (2), the total length of the optical system can be shortened, and a compact zoom lens can be obtained. If the upper limit of conditional expression ■ is exceeded, it becomes difficult to increase the power of the lens group for aberration correction,
Additionally, the overall length of the lever optical system, which requires a large amount of zooming movement, becomes large.

Furthermore, it is preferable that the following conditional expression (0) be satisfied.

0, 5<f s/D<0.58...
- As mentioned above, the cropping camera has an optical zoom function by zooming the shooting lens,
In addition, in a trimming camera that can generate trimming information for electronic zoom that enlarges only an image corresponding to a predetermined range of an image on a photographic medium formed by the photographic lens during printing, the following conditional expression (2) is satisfied. If the configuration satisfies ■, ■, and ■,
This is a trimming camera that has a composite focal length that is well-balanced around a standard focal length on the tele side and wide side, and has a zoom lens that includes a focal length that is frequently photographed.

fc/fS≦2 ・・・・・・■0, 5< f
s/D < 0.89 − ・=■RfL/RfS
＞2.3 ・・・・・・■0.8<RfM,/
D <1.35 ...... ■Where, fL: The longest focal length of the photographic lens fS: The shortest focal length of the photographic lens D: The diagonal length of the camera's image frame corresponding to the diagonal length of the film RfL : The longest focal length RfS among the composite focal lengths corresponding to the composite zoom that combines the optical zoom and electronic zoom: The shortest focal length among the composite focal lengths that correspond to the composite zoom that combines the optical zoom and electronic zoom The distance Rf=(RfL+RfS)/2.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of an optical system in a trimming camera according to the present invention will be described below.

However, in each embodiment, r, to r+a represent the radius of curvature of the surface counted from the object side, d1 to d+s represent the axial surface spacing counted from the object side, and N1 to N7. ν1~Schiff indicates the refractive index and Atbe number of each lens for the d-line counted from the object side. Also, fO2 is the focal length of the entire photographic lens system, Flo
indicates the F number.

In the examples, a surface with a radius of curvature marked with * indicates that it is an aspherical surface, and is defined by the following equation representing the shape of the aspherical surface.

Amount of deviation from the reference plane in the optical axis direction paraxial radius of curvature Height perpendicular to optical axis i-th aspheric coefficient conic constant It is.

In addition, f L/ fS, f s/ in conditional expressions ■ to ■
D, Rfq/RfS and RfM/D values (D
~43.26. Film size: 24X 36
mm) are also shown. However, the specifications for Example 1 are f O2 = 24-48. βε2=1.7×,
For Example 2, foz”24-35.βε2=1,
7X and 2X, f for Example 3. 2=28~50
．． βε2=1.4×, foz=24 for Example 4
~48. The values for each case of β5°=1.7× are shown.

<Example 1> foz=24.7-48.5 F No =
3.7~7.039.382 Σd=34.458~25.654 弗''1【堡jL r, : ε=0.69694 A,=0.83987X 10-'As''0.43622X10'' A, =-0,45074X 1O-7r2: ε
=-0,10021X 1. OA,=0.16650X
1O-3 A,=0.41445X 1O-5 A8=0.12719X 1O-8 r5: ε=-0,49639X10A,=0.
52938X 10-' A6=0.37843X 10-1 0-6A, 54954X 10-'' D = 1..24 <Example 2> f oz" 24.0~35.0 NO 3.7~5.4 -36.262 Σd=31. ．． 4.84～25.654弗”1 [-section 1
: ε=0.68198 A,=0.81357X 1.0-'A6"0.45513X10"5 As=-0,46342X 10-7 : ε=-0,10387X 10 A42O,17167X 10" 3 A6 = 0.41534 f s = 1.46 fS/D = 0.55 RfL/RfS = 2.48 Rfh/'D = 0.97 <Example 3> fo, != 29.0 to 48.5 Sales supervisor J mouth "Ji old 1 1.46 0.55 2.92 1.09 NO Ku" L rate - 4,0 ~ 6.7 Etsue 1 number 5.400 rs -9,798 Σd = 31.822 ~ 25.5 sin ” Only 1 rl per month: ε=0.10180X 10A,=0
．． 10059X 1O-3 A,=0.31773X 1O-5 Ae=-0,31284X 1O-7 r2:ε=-0,47784 A,=0.19880x 1O-3 Ae=0.34370X 1O-5 As=0 .11355X 1O-7 r6: ε=-0,35722X 10A, =0.5
2639X 10-' As=0.42056x 1O-6 A8=0.47273X 10-8 Article 1 and fL/fs = 1.67 fL/D =0.67 Rh/RfS = 2. 34 RfM, /D = 1.12 <Example 4> f oz " 24.6 ~ 46.6 Wataru! Raw 110 Jji Ll rl 38.179 Ku" L Tei.

FNO=4.0 ヱ” Yibunshiki a27.250 r3 88.929 d.

5.300 41.500 1.000~24.179 37.241 3.560 N, 1.72000 52.14 97.799 1l1 18.684 d eye 0.940 69.691 1.340 72.835 (Aperture ) Σd=51.325~71.509 吏]11伍L r6 : e :O, 100OOX 10A4=
-0,11101X 10-' A6=-0.13166x 1O-7 As=-0,70088x 10-+l! A+[l=0
．． 21766X 10 interest 2A+2=-0,51834X
10 bow 5A+, =-0,10086X 10 bow 7A
+e: 0.26022 3 is a case where the lens back is short and is suitable for the LS type. Embodiment 4 is a case where the lens back is long, and is suitable for an SLR type or a type in which a mirror is inserted between the lens and the film.

FIGS. 1 to 4 are lens configuration diagrams corresponding to Examples 1 to 4, respectively, with FIGS. 1 to 3 showing the wide-angle state, and FIG. 4 showing the telephoto state.

FIG. 5(a) shows the focal length (f) at the wide end of Example 1.
02"24., 7), and Figures (b) and (c) show the lens arrangement and optical path at the focal length (f oz -48,5) at the telephoto end in Example 1. However, the maximum trimming magnification (β, 2
) is 1°7 in the same figure (C), so the angle of view (
Only the area y=12.7) is printed.

FIG. 6(a) shows the focal length (fo
Figures 2 and 24.0) show the lens arrangement and optical path, and Figures (b) to (d) show the lens arrangement and optical path at the focal length Cfoz 35.0) at the telephoto end in Example 2. There is. However, the maximum trimming magnification (β.2) is 1.7 in (C) and (d), respectively. 2, the angle of view is narrowed (y' = 12.7. 10.8)
Only the area is printed.

FIG. 7(a) shows the focal length (f) at the wide end of Example 3.
oz = 29.0), and Figures (b) and (c) show the lens arrangement and optical path at the focal length (foz 48.5) at the telephoto end in Example 3. There is. However, since the maximum trimming magnification (βε2) is 1.4 in the same figure (c), the narrowed angle of view (y'
=15.5) are printed.

FIG. 8(a) shows the focal length (f0) at the wide end of Example 4.
2.24.6), and Figures (b) and (c) show the lens arrangement and optical path at the focal length (f 02"46.6) at the telephoto end of Example 4. However, since the maximum trimming magnification (βEZ) is 1°7 in the same figure (C), the narrowed angle of view (y'
=12.7) is printed.

Examples 1 to 3 are all composed of lenses of a negative/positive first group and a positive/negative second group in order from the object side, and both surfaces of the first lens and the object of the third lens are The side surfaces are aspherical.

In addition, the fourth embodiment is composed of a first group of negative, negative, and positive lenses in order from the object side, and a second group of positive, positive, negative, and positive lenses, and the image side of the third lens. The surface is aspheric.

In addition, (A,) (Fig. 5), (A2) in Examples 1 to 3
(Fig. 6) and (A,) (Fig. 3, Fig. 7) represent apertures, but they are omitted in Figs. 1 and 2. (A4) and (A,) in FIGS. 4 and 8 also represent apertures.

9 to 12 are aberration diagrams corresponding to Examples 1 to 4, respectively, and the fifth
The aberrations shown in FIGS. Also, the solid line (d) is d
The dotted line (SC) represents the sine condition. Further, the dotted line (DM) and the solid line (DS) represent astigmatism on the meridional plane and the sagittal plane, respectively.

In addition, in the above embodiments 1 to 4, the electronic zoom is performed at the telephoto end of the optical zoom, whereas the electronic zoom is performed at the wide end of the optical zoom.
Alternatively, in the embodiment described below, a composite zoom is performed in which optical zoom and electronic zoom are combined at a predetermined ratio over the entire zooming range.

FIG. 13 is a block diagram of a trimming camera showing the configuration in this case. Hereinafter, the composite focal length corresponding to the composite zoom obtained by combining the optical zoom and the electronic zoom will be referred to as the resultant focal length.

After the photographer selects to shoot with the cropping system,
When the resultant focal length (focal length corresponding to the final image range obtained by combining optical zoom and electronic zoom) is set using the image range setting means (110) shown in FIG. 13, a signal corresponding to the focal length is determined. Means (1,20)
sent to. The determining means (120) uses data corresponding to the focal length (f oz) of the photographic lens and data corresponding to the trimming magnification (βε2) according to the resultant focal length through a predetermined calculation, or converts the resultant focal length into address information. signals representing each are sent to the lens drive control means (130) and the trimming information transmission means (140).

A motor (13) constituting the lens drive control means (130)
5), the photographing lens (150) is driven according to f02. Further, the trimming information transmitting means (140) transmits and records information on the trimming magnification to the film (160) according to βε2. Note that recording of the trimming information is not limited to the film (160), but can also be performed on the film cartridge (165), and can be performed not only by optical imprinting but also by methods such as magnetic recording.

The camera of this embodiment has a focal length of 24 to 48 (m++
It is equipped with a zoom lens that changes in the +) range, and the maximum zoom ratio by electronic zoom is 2x. Therefore, by combining optical zoom and electronic zoom, this camera has a resulting focal length of 24 to 96 (
Zooming is possible within a range of

FIG. 14 shows a configuration diagram of the photographic lens, the optical system of the finder, and the strobe of the trimming camera of this embodiment.

The photographic lens (1) is a zoom lens consisting of a front group and a rear group. The front group and the rear group movably engage with a linear guide (not shown) formed in the lens barrel, and are slidable in cam grooves (18a) and (18b) of a cam ring (18), respectively. engaged. A gear part (1
8c) is formed, and a rotational speed adjustment gear (21) is screwed into this gear part (18c), and a zoom lens motor (hereinafter referred to as rZL motor) (
14) gear (19) is screwed together. With the above configuration, the rotational force of the ZL motor (14) is transmitted to the cam ring (18) via the gears (19), (21) and the gear portion (18c), and the cam ring (18) is rotationally driven. The front group and the rear group are respectively formed into cam grooves (18a) by the rotational movement of the cam ring (18).
) and (18b), and move along the optical axis at different speeds along the linear guide. As the positions of the front group and the rear group change, the focal length of the photographic lens (1) changes. Note that the open F value of this lens changes depending on the optical zoom, and is F4 at an optical zoom of 35 mm.
It is 48mm and F7.5. Finder (2)
is a real image zoom finder having an objective lens group (4) consisting of a front group (41) and a rear group (42);
6) is a condenser lens, and (5) is an eyepiece lens.

Note that (7), (8), (9), and (10) constitute an image reversing mirror.

Support members (41a) and (42a) of the front group (41) and rear group (42) are slidably engaged with cam grooves (16a) and (16b) provided in the cam plate (16), respectively. At the same time, the cam plate (16) is movably engaged with a linear guide groove (not shown) of a linear guide plate (not shown) provided at the lower part of the cam plate (16). In addition, a rack part (16d) is formed at the front end of the cam plate (16), and a finder motor (hereinafter referred to as "F motor") (1
The gear (20) of 5) is screwed together. With the above configuration,
When the F motor (15) is rotationally driven, the cam plate (16) moves horizontally in a direction perpendicular to the optical axis, and this horizontal movement causes the front group (41) and the rear group (42) to move into the cam grooves (16a). ) and (16b), and move on the optical axis at different speeds along the linear guide groove. Front group (
41) and the rear group (42), the focal length of the finder (2) changes.

Note that the optical axis of the photographic lens (1) and the optical axis of the objective lens (4) are parallel. Further, the variable focal length range of the finder (2) is wider than the variable focal length range of the photographic lens (1), and is configured to cover f=24 to 96 mm.

It is also possible to omit the finder motor by interlocking the finder cam plate with the zoom lens motor through a reduction gear train. In this case, the actual focal length of the photographic lens and the focal length of the finder change at different rates.

FIG. 15 is a perspective view schematically showing the appearance of this embodiment. On the front of the camera body (200), there is a photographic lens (21
0) and a front window for a finder (220). On the top of the camera body (200), there is a release button (
230), a resultant zoom operation button (240), and an information display board (250). A desired resultant focal length can be set by pressing the telescopic (T) or wide pointer (W) of the resultant zoom operation button (240). In addition, the information display board (25
0) is the resultant focal length and the number of shots of the film.

Displays other information necessary for shooting.

Next, the circuit configuration of this trimming camera will be explained.

FIG. 16 shows an example of the circuit configuration of a trimming camera. In the figure, (50) is a microcomputer (hereinafter referred to as "microcomputer") that centrally controls the drive of each actuator, which will be described below, and also performs camera sequence and exposure calculations. (51
) is an F motor control circuit that controls the rotational direction and drive amount of the finder (F) motor (15) based on command signals from the microcomputer (50).

Reference numeral (52) is an RF encoder that detects the focal length operated and set by the photographer, that is, the resultant focal length (RF) from the state of the finder optical system. (53) is a ZL motor control circuit that controls the rotational direction and drive amount of the zoom lens ZL motor (14) of the photographic lens in accordance with the command signal from the microcomputer (5Q). (54) is a ZL encoder that detects the focal length of the photographic lens (1).

(55) is a film motor control circuit for controlling the drive of the film motor (56) for winding the film (22) (FIG. 14) one frame at a time. (57) is a memory provided in the film container (17) (Fig. 14), in which trimming information and the like are stored from the camera side. (
58) is a DX circuit that detects the film sensitivity S code displayed on the film container (17); (59) is a display circuit that displays the set focal length; (60)
is a focusing lens motor control circuit that controls the driving of a focusing lens motor (61) which is a driving source for the focusing lens of the photographic lens (1). (62)
is a shutter control circuit that controls the opening/closing operation of the shutter. The shutter used in this embodiment is an aperture shutter, and when the shutter speed is determined in accordance with the exposure value, the aperture value is automatically determined.

(65) is a photometry circuit that measures the brightness of a subject by receiving natural light reflected from the subject using a light receiving element;
6) is a distance measuring circuit that detects the distance to the subject.

Next, I will explain the switches. The switch (S+) is a photography preparation switch that is turned on when the release button is pressed halfway. When the switch (S,) is turned on,
Photometry and distance measurement for photographing are performed. Switch (S
2) is a release switch that is turned on when the release button is pressed.

When the switch (S2) is turned on, exposure is started.

The switch (S4) is turned on when the photographic lens (1) is in the initial position (the lens is retracted the most, and in this example, the focal length of the lens at that time is the minimum (24 mm)). This is the zoom reset detection switch. When photographing is completed, the photographing lens (1) is always returned to the initial position, and the above-mentioned return operation is detected by turning on the switch (S4).

The switch (SAT) and the switch (S21.I) correspond to the Norisartanto operation button (240) in FIG. 15, and are operated by the photographer to drive the objective lens group (4) of the finder (2). This is a switch that indicates the direction. Objective lens group (4) of finder (2)
When the switch (SAT) is turned on, it is driven to the telephoto side, and when the switch (Sz=) is turned on, it is driven to the wide side.

Next, an outline of the photographing operation of this trimming camera will be explained. The trimming camera of this embodiment has an optical zoom and an electronic zoom.

As mentioned above, the camera lens of this example is
It is a zoom lens whose focal length is variable in the range of 24 to 48 mm, and the zoom ratio of the electronic zoom is set to 1 to 2 times. This allows this camera to effectively use 24 to 96
Zooming can be performed within a range of mm. For example, the focal length (R
When F) is 48mm, the focal length of the photographic lens (1) is set to 34mm (optical zoom zoom ratio 21'2x) and the photograph is taken, and the electronic zoom is set to 21mm.
A trimming magnification of 2x is set, and the trimming magnification is recorded in the memory of the film container (17) or on the film (22). This trimming magnification is read out at the time of printing, and a portion of the image on the film (usually the central portion where the main subject is photographed) is enlarged to 21'2 times and printed. Therefore, in effect, the focal length of the photographic lens (1) is 48
You can obtain a print of a photo that captures the same area as the one taken with the camera set to mm.

Next, the operation of the camera will be explained using FIGS. 17 to 20. FIG. 17 shows the main flow. First, when the main power is turned on and the camera is started, it is determined whether the switch (S3) is turned on (#5). If it is in the on state, execute the "5IONJ subroutine (FIG. 18), which will be described later (1110 (#70)). If it is in the off state, switch (SZT).

Determine the moving direction (zooming direction) of the objective lens (4) of the finder (2) from the state of (82,) (#
20, #30). If the moving direction is on the wide side, the objective lens group (4) of the finder (2) is driven to the wide side, and the RF encoder (52) changes the focal length (
RF). Do the same thing even on the tele side (#4
0).

After that, the process returns to step (#5). switch(
If S2T) and (S2-) are both off, it is determined whether the F motor (15) is being driven based on the state of the flag ZFMUF (#45). Furthermore, flag Z
FMUF is set to 1 if the F motor (15) is being driven.

If the F motor (15) is stopped, step (#5)
and if the F motor (15) is driving, the F
10m5ec dark brake on motor (15) (short circuit condition)
After that, turn off the power supply and turn off the flag ZF.
The MUF is reset to 0 and the process returns to step (#5) (#50 to #60).

Next, the 'S l0NJ subroutine will be explained using FIG. 18. "S10NJ's sub-function camera measures the brightness of the subject, performs exposure calculations, and calculates the exposure control value. When the release signal is issued, the shooting lens (based on the set or calculated optical zoom magnification data) 1) The focal length is set, the focus is adjusted based on the measured object distance, and the exposure is performed based on the exposure control value.

When the switch (S,) is turned on, first, the photometry circuit (65
) and distance measuring circuit (66) are operated to detect the subject distance Du and subject brightness B (#70, #75).

Next, the “exposure calculation” subroutine (19th
Execute (Figure) to calculate the magnification data (02) related to the shooting magnification of the optical zoom, the magnification data (EZ) related to the shooting magnification of the electronic zoom, the control shutter speed, etc. #95 (#250)), and the resultant focal length in the finder. (#10) displayed on the display section (information display board (250) in Fig.
0). Coconi, magnification data (02) and (EZ) c.

A value of ~1, 02 = 0 means that the zoom ratio of the photographic lens is 1x,
That is, the focal length of the photographic lens (1) is 24 mm, and 07-1 indicates that the zoom ratio of the photographic lens is 2 times, that is, the focal length of the photographic lens (1) is 48 mm. Furthermore, magnification data EZ=O indicates that the cropping magnification is 1x (full screen print), that is, a pseudo photographing magnification by electronic zoom is not set, and EZ=1 indicates that the trimming magnification (enlargement magnification) is 2x ( 174 areas of the entire screen will be enlarged and printed by 2 times).

Next, the state of the release switch (S2) is determined, and if it is in the off state, the state of the switch (S,) is determined (#
105. #145). If the switch (St) is on, the process waits until the release switch (S2) is turned on, and if it is off, the process returns to step (#5).

If the release switch (S2) is on, the value of the magnification data (O2) is determined and the focal length of the photographic lens (1) is adjusted (optical zoom) (#115). That is,
If the magnification data (OZ) is not O, execute the "zoom lens control" subroutine described later to change the magnification data (OZ).
The focal length of the photographing lens (1) is set to the focal length corresponding to the value of Z) (#115 (#550)). If the magnification data (OZ) is ◯, skip to step (:1120). That is, the focal length of the photographic lens (1) is set to the initial state (24 m111). When the focal length of the photographic lens (1) is set (optical zoom is completed), exposure control is executed, and a predetermined exposure is performed on the film surface using the exposure control value calculated in step (#95). 120
).

When the exposure is completed, the magnification data (EZ) calculated in step (#95) is stored on the film as trimming data (or stored in the film container (1) as shown in FIG.
7)), the "zoom lens control" subroutine (Fig. 20), which will be described later, is executed.
Execute to return the photographing lens (1) to its initial state (#
125. #130 (#550)), wind the film one frame (#135). Then, the process waits until the switch (S,) is turned off and returns to step (#5).

Next, the "exposure calculation J" subroutine will be explained using FIG.
EZ) and optical zoom magnification data (02) are calculated.

First, magnification data (OZ) and (EZ) are initially set to O (#255 and #260). Next, the film sensitivity S of the loaded film (22) is determined by the DX circuit (58).
), read out the film sensitivity S, and step (#7
5), the object brightness Bu detected in (see Figure 18)
Calculate the sharp exposure value Eu (=B.-I-S,) (#
270. #275). Next, the encoder (52) detects the focal length (RF) corresponding to the focal length of the finder (2), that is, the manually set focal length (#280).

When the exposure compensation values △E and J are set, step (#27
From the exposure value Eu calculated in 5), the above exposure correction value △E,
is subtracted to correct the exposure value E, and the exposure value E after this correction is
, the shutter speed Tu is calculated from (#310).

Further, magnification data (RZ) is determined from the resultant focal length (RF). The magnification data (RZ) has the same meaning as the magnification data (OZ) and (EZ), and is 0 to 0 depending on the resultant focal length (RF).
The value of 2 is determined (#315). For example, RF=24
For mm, RZ=01RF= For 48mm, RZ=l,
When RF=96mm, RZ=2. Next, based on the determined magnification data (RZ), the magnification data (OZ) and (F, z) are each calculated as OZ= EZ= (1/2)RZ
LT calculation, U turn t 6 (#320).

Next, the "zoom lens control" subroutine will be explained using FIG. 20. The "zoom lens control" subroutine is a flow for driving the ZL motor (14) based on magnification data (OZ) and setting the focal length of the photographic lens (1) to a predetermined focal length.

First, a flag Z indicating that the photographic lens (1) has been driven
Determine whether FMF is set to 1 (#5
50). If it is reset to O, the shooting lens (1)
control to extend the lens to the target focal length (#115 in Figure 18)
(see), so the process moves to #555 to #570, and the extension control of the photographic lens (1) is performed. That is, ZL motor (
14) in the normal rotation (clockwise) to perform control to extend the photographic lens toward the telephoto side (#555). At the same time, a signal ZL indicating the focal length of the current position of the photographing lens (1) is detected from the encoder (54), and the value of this signal ZL is compared with the magnification data (O7) until ZL=OZ.
Drive the ZL motor (14) (#560. #565
). When ZL=OZ, set the flag ZFMF to 1, brake the ZL motor (14) for 10m5ec, turn off the power supply, and step (#
125) (#570, #590. #
595). If flag ZFMF is set to 1,
That is, if the photographic lens (1) has not been reset to its initial position, the control is to retract the extended photographic lens (1) (see #130 in FIG. ) performs renormalization control. That is, the flag ZFMF is reset to 0, and the ZL motor (1
4) is reversed (counterclockwise), and the photographic lens (1)
Performs control to retract to the wide side (#575. #5
80). Then, the ZL motor (14) is driven until the switch (S4) is turned on (until the initial position is detected), and when the switch (S4) is turned on, the ZL motor (14)
After applying the brakes for 10m5ec, turn off the power supply and return to step (#140).
#585 to #595).

Cocote, magnification data (EZ), (OZ), (RZ)
and the actual focal length (f oz) of the photographic lens (1)
The relationship between the trimming magnification (βε2) and the resultant focal length (RF) will be explained based on FIG. 21.

In this example, the resultant focal length (
RF). In other words, the actual focal length (f oz) of the photographic lens (1) is changed from 24 mm to 4.8 mm.
When zooming in, the trimming magnification (βε2) is also changed from 1 to 2 at a constant rate. In other words, the rate of change in the focal length (f oz) of the photographic lens (1) and the rate of change in the trimming magnification (βEZ) are configured to change at respective ratios. In addition, the trimming magnification (
The relationship between βε2) and magnification data (EZ) is EZ=βE
2 1, and the relationship between the actual focal length (f oz) of the photographic lens (1) and the magnification data (OZ) is OZ=
(f oz 24)/24, and the relationship between resultant focal length (RF) and magnification data (RZ) is expressed as RZ=(RF-24)/36. For example, the resultant focal length (RF) is 4.8mm.
is set, the actual focal length (
f oz) is adjusted to 36 mm, and data is stored on the film or film container (17) etc. so that the cropping magnification (βε2) of 1.5 times is sometimes set for printing (step (in FIG. 19)). #320) (7) OZ=
EZ= (1/2) see RZ).

As shown in FIG. 22, the resultant focal length (RF) may be changed along solid lines M and N. still,
The broken lines in this figure correspond to the straight lines in FIG. Solid line M indicates magnification data (gz
) is large, and in the solid line N, the change in magnification data (OZ) is large on the wide side of the photographic lens (1).

Resultant focal length 2 depending on each line, M, N
Since the aperture effect is different between 4mm and 96mm,
Line, M, N depending on the shooting situation of the user
You may choose one of them.

Also, the actual focal length (f oz) of the photographic lens (1)
Regarding the example where the range is 28 mm to 84 mm, the second
A graph showing the same relationship as in FIG. 1 is shown in FIG.

By associating the magnification data (RZ) with o~2 and the magnification data (OZ) and (EZ) with O~1, the actual focal length (foz) range and trimming magnification (βε2) range of the photographic lens (1) can be determined. No matter what, if magnification data (RZ) is obtained, magnification data (OZ) and (E
Z) can be obtained by very simple calculations.

In addition, the magnification data (RZ) is directly detected without detecting the resultant focal length (RF), and each magnification data (
Magnification data (OZ), (EZ) using RZ) as address
, or the focal length (f oz) of the photographic lens (1),
The trimming magnification (βε2) may be stored in the ROM.

FIG. 23 is a diagram showing the camera body (200) of FIG. 15 with the back cover opened. Inside the camera body (200) are a cartridge chamber (300) and a spool chamber (320).
and an LED (340) for imprinting trimming data. As shown in FIG. 24, an LED (3
40), the trimming data (370) is imprinted. The trimming data (370) is, for example, the trimming size.

These include the date (July 7th, 1:01am, etc.), whether or not the date is imprinted, etc. In addition, the trimming data (37
A portion (380) surrounded by a broken line on the film (360) on which 0) is imprinted indicates a range where the trimming magnification (βε2) is twice. Also, trimming data (37
For imprinting 0), a magnet or the like may be used instead of the LED (340), and the image may be imprinted magnetically on a magnetic material provided in advance on the film. The electronic zoom switching button (360) in FIG. 23 is for switching between only optical zoom and synthetic zoom.

As explained above, the trimming camera of the present invention has an optical zoom function by zooming the photographic lens,
In a trimming camera capable of generating trimming information for electronic zoom that enlarges only an image corresponding to a predetermined range of an image on a photographic medium formed by the photographic lens during printing, the conditional expressions (1) and (2) are satisfied. , (2) and (2), the trimming camera has a composite focal length that is well-balanced around the standard focal length on the tele side and wide side.

Therefore, the photographic lens used in the present invention has the effect that the photographer can continuously obtain frequently used focal length ranges, and there is no unnaturalness in the photographs taken. Since it is set on the wide side compared to the previous model, the overall lens length can be further shortened. As a result, a compact trimming camera can be realized.

Furthermore, since the F number can be made smaller (brighter), the strobe irradiation distance can be extended, and as a result, the strobe shooting distance can be expanded. Since it is also possible to use a faster shutter speed, it also has the effect of improving the limits for camera shake.

Since the minimum focus distance is set to the wider side than conventional models, the depth of field is deep, and as a result, the autofocus distance measurement accuracy does not deteriorate even when electronic zoom is used. There is.

Furthermore, since the shortest focal length is set on the wider side than conventional cameras, the trimming camera of the present invention is also suitable for panoramic photography.

[Brief explanation of drawings]

FIG. 1, FIG. 2, FIG. 3, and FIG. 4 are lens configuration diagrams corresponding to Examples 1 to 4 of the optical system of the present invention, respectively. FIG. 5, FIG. 6, FIG. 7, and FIG. 8 are optical path diagrams corresponding to Examples 1 to 4 of the optical system of the present invention, respectively. FIG. 9, FIG. 10, FIG. 11, and FIG. 12 are aberration diagrams corresponding to Examples 1 to 4 of the optical system according to the present invention, respectively. FIG. 13 is a block diagram showing one embodiment of the present invention, and FIG.
15 is a perspective view schematically showing the appearance of an embodiment of the present invention, and FIG. 16 is a block diagram showing the circuit configuration of an embodiment of the present invention. be. FIGS. 17, 18, 19, and 20 are flowcharts showing the operation of each part in the embodiment of the present invention. FIGS. 21 and 22 are graphs showing the relationship between magnification data, focal length of the photographic lens, trimming magnification, and sultan focal length in the embodiment of the present invention. FIG. 23 is a diagram showing the main part of the embodiment of the present invention, and the second
FIG. 4 is a diagram showing a film on which trimming data is imprinted according to an embodiment of the present invention. FIG. 25 is a diagram for explaining the trimming system adopted by the present invention. FIG. 26 is a graph showing the relationship between the magnification data, the focal length of the photographing lens, the trimming magnification, and the sultant focal length in another embodiment of the present invention. (110)...Image range setting means. (120)...Determination means. (130)...Lens drive control means. (140) Trimming information transmission means. (150)... Photography lens. (160)...Film. (165)...Film cartridge.

Claims (1)

[Scope of Claims] (1) An electronic zoom that has an optical zoom function by zooming a photographic lens and magnifies only an image corresponding to a predetermined range of an image on a photographic medium formed by the photographic lens during printing. A trimming camera that is capable of generating trimming information for use, and is characterized by satisfying the following conditions: f_L/f_S≦2 0.5<f_S/D<0.69 Rf_L/Rf_S>2 .3 0.8<Rf_M/D<1.35 where, f_L: longest focal length of the photographic lens f_S
: Shortest focal length D of the photographic lens: Diagonal length Rf_L of the camera's image frame corresponding to the diagonal length of the film: Longest focal length among the composite focal lengths corresponding to the composite zoom that combines the optical zoom and electronic zoom Rf_S: The shortest focal length among the combined focal lengths corresponding to the combined zoom obtained by combining the optical zoom and the electronic zoom is Rf_M=(Rf_L+Rf_S)/2. (2) The trimming camera according to claim 1, further satisfying the following condition: 0.5<f_S/D<0.58.