JPH04309936A - Trimming camera - Google Patents

Abstract

PURPOSE:To extend the variable range of photographing magnification which is set by the operation of optical zoom to a variable range of pseudo photographing magnification in a trimming camera which is constituted by attaching an attachable/detachable photographing lens consisting of a manual zoom lens to a camera main body provided with an electronic zoom function. CONSTITUTION:The focal distance (f) of the zoom lens LE' is set by a zoom operating ring. Information on the focal distance (f) is inputted in a microcomputer C1 in a camera main body BD with the information on the variable range(fmax, fmin) of the focal distance (f) from a circuit within a lens LEDCr in a zoom lens LE'. The microcomputer muC1 calculates the trimming magnification Mf corresponding to the focal distance (f) based on the information(f, fmax, fmin) on the focal distance (f), and the calculated result is recorded on a film through a data write circuit WRT in the case of photographing.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trimming camera that can pseudo-expand photographing magnification by combining optical zoom and electronic zoom using a trimming magnification.

0002

BACKGROUND OF THE INVENTION Conventionally, a zoom effect has been obtained by using an optical zoom function to change the photographing magnification of a zoom lens and by enlarging and printing a part of the photographed film image at a set magnification (hereinafter referred to as trimming magnification). A trimming camera is known that can be combined with a so-called electronic zoom function to virtually expand the variable range of photographing magnification (variable range of focal length) of the zoom lens.

For example, in Japanese Patent Laid-Open No. 62-40440, a zoom operation ring of a zoom lens is made operable over a range wider than the optical zoom range, and when the zoom operation ring is operated beyond the telephoto end, a predetermined The cropping magnification is shown as being set.

Furthermore, Japanese Patent Application Laid-Open No. 2-170149 has a zoom lens driven by a motor, and a slide switch provided on the camera body instructs the zoom operation of the zoom lens and switching setting of the trimming magnification. A possible cropped camera is shown. The slide switch can be operated in both left and right directions corresponding to the zoom direction, and can be operated in two steps in both directions.The first switch operation allows the zoom lens to be moved to the wide end or telephoto end. Zooming towards the camera is instructed, and the second switch operation instructs switching between a plurality of preset trimming magnifications.

[0005] The same publication also states that in a trimming camera comprising a camera body with an electronic zoom function and a removable manual zoom lens, when the zoom operation ring of the zoom lens is operated at a speed exceeding a predetermined speed, , the trimming magnification is shown to be switched and set.

[0006]

[Problems to be Solved by the Invention] Optical zoom and electronic zoom have essentially different zoom mechanisms and each has independent functions. distance, i.e.
The photographing magnification and the trimming magnification must be set using each operating member.

[0007]Usually, photographers rarely use both zoom functions for zoom shooting, but often configure the angle of view by appropriately enlarging the subject within a pseudo-extended zoom range. With the above configuration, the zoom operation becomes complicated and zoom photography becomes difficult.

In particular, in a trimming camera that is constructed by attaching an interchangeable lens consisting of a zoom lens to the camera body, the focal length of which is set by operating an operating member on the lens side, both the electronic zoom and optical zoom operating members are connected to the camera. Since the main body and the photographic lens are arranged separately, operability becomes worse.

[0009] In the above-mentioned trimming camera, if it is possible to zoom to a variable range of pseudo magnification by operating the zoom operation member of the interchangeable lens,
The zoom range of the optical zoom operation is substantially expanded, and there is no need to separately perform the zoom operations for electronic zoom and optical zoom, making the zoom operation easier.

On the other hand, in the above-mentioned Japanese Unexamined Patent Publication No. 62-40440, optical zoom and electronic zoom can be operated by the zoom operation ring of the zoom lens, but the electronic zoom is A zoom operation range is provided, and the zoom range by the optical zoom operation is not substantially expanded. Therefore, a switch mechanism is required on the camera body side to set the cropping magnification by electronic zoom operation of the zoom operation ring.
The mechanisms of the camera body and interchangeable lens related to the zoom mechanism become complicated.

Further, since the trimming magnification is set to a predetermined magnification, it is not possible to continuously set a pseudo photographing magnification. Further, since priority is always given to the optical zoom, only one combination of the photographic magnification and the trimming magnification of the photographic lens can be set for the pseudo photographic magnification.

[0012] In the above-mentioned Japanese Unexamined Patent Publication No. 2-170149, the optical zoom can be operated by a slide switch provided on the camera body, but it is necessary to set the photographing magnification and cropping magnification of the photographic lens respectively. However, since optical zoom and electronic zoom must be used separately, the zoom operation becomes complicated.

The present invention has been made in view of the above-mentioned problems, and includes a camera body having an electronic zoom function equipped with a detachable photographic lens consisting of a zoom lens whose focal length is set by an operation member on the lens side. In a cropping camera configured with the following, the predetermined cropping magnification can be changed and set in conjunction with the optical zoom operation of the photographing lens, and the zoom range by the optical zoom operation can be expanded to a pseudo photographing magnification range, making it easy to take zoom shots. The purpose of the present invention is to provide a trimming camera that can perform the following operations.

[0014]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a trimming camera in which a detachable photographing lens consisting of a zoom lens is attached to a camera body in which a trimming magnification can be set. The lens is
The camera body is provided with a focal length output means for outputting information on a set focal length, and an output means for outputting the output focal length information to the camera body, and the camera body is configured to perform a preset relationship based on the focal length information. The apparatus is equipped with a calculation means for calculating a trimming magnification based on .

The trimming magnification may be calculated from the focal length information using the following equation.

Mf=(f-fmin)・(Mfmax-
Mfmin)/(fmax-fmin)+Mfmin where, Mf; trimming magnification Mfmax; maximum value Mfmi of the trimming magnification variable range
n; Minimum value f of the variable range of trimming magnification; Set focal length fmax of the photographic lens; Maximum value fm of the variable range of focal length of the photographic lens
in; Minimum value of the focal length variable range of the photographic lens

001
7]

According to the present invention, information on the focal length of the photographic lens is detected, and the detection result is sent to the camera body. In the camera body, the trimming magnification is set based on a preset relationship from the input focal length information.

Further, the trimming magnification Mf is determined by the maximum value Mfmax and the minimum value Mfmi of the trimming magnification variable range.
n, the maximum value fmax of the focal length variable range of the photographic lens,
Minimum value fmin and set focal length f of the photographing lens
It is calculated from the following formula.

Mf=(f−fmin)・(Mfmax−Mf
min)/(fmax-fmin)+Mfmin

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A trimming camera according to the present invention will be explained by taking as an example a single-lens reflex camera in which an interchangeable lens (zoom lens) is attached to a camera body.

This trimming camera is equipped with well-known AE (automatic exposure control) and AF (automatic focus adjustment) functions, as well as a PZ (power zoom) function in which zooming of an interchangeable lens is performed by driving a motor. Also, A
The E (automatic exposure control) mode has three modes: shutter priority mode (hereinafter referred to as S mode), aperture priority mode (hereinafter referred to as A mode), and program mode (hereinafter referred to as P mode). It has two modes: normal shooting mode and panorama mode. Furthermore, as a zoom mode, the so-called optical zoom (32 mm to 1
05mm) and so-called electronic zoom (1 to 2x), which creates a pseudo-zoom effect by enlarging and printing a part of the film image after shooting at a set magnification (hereinafter referred to as trimming magnification). have. Therefore, the variable range of the focal length is equivalently 32 mm to 210 mm.

FIG. 4 is a front external view of the camera body of the trimming camera according to the present invention, and FIG. 5 is a rear external view of the camera body of the trimming camera. The names and functions of each part will be briefly explained below.

Reference numeral 1 denotes a slider for turning on the main switch SM, which will be described later. When the slider 1 is in the ON position, the camera is ready for operation, and when it is in the OFF position, the camera is inoperable. state. 2 is
This is a release button, and when pressed halfway, a photography preparation switch S1, which will be described later, is turned on, and various photography preparation operations such as photometry, exposure calculation, and AF (automatic focus adjustment) are performed. Also, when the release button 2 is fully pressed, the release switch S2, which will be described later, is set to O.
N, and an exposure control operation is performed. Reference numeral 3 denotes an up/down switch consisting of an up switch 3a and a down switch 3b for changing the shutter speed TV or aperture value AV according to the setting mode of the AE mode, which will be described later. That is, when the AE mode is set to S (shutter priority) mode, the up/down switch 3 functions as a shutter speed TV change switch, and the A
When set to the (aperture priority) mode, the up/down switch 3 functions as a switch for changing the aperture value AV. 4 is a display section for displaying the control shutter speed TVC and control aperture value AVC to be used for actual exposure control.

Reference numeral 5 denotes a mount lock pin for locking an interchangeable lens LE, which will be described later.If it is in the locked state, the lens mounting switch SLE, which will be described later, will be in the OFF state, and if it is not in the locked state, the lens mounting switch SLE will be in the OFF state. SLE becomes ON state. 6 is an AF coupler;
The rotational force of the AF motor built into the camera body BD is transmitted to the interchangeable lens LE side. Reference numeral 7 denotes an aperture lever, which drives the aperture provided in the interchangeable lens LE by a predetermined number of stages in accordance with the control aperture value AVC determined by the microcomputer (hereinafter referred to as microcomputer) μC1 built into the camera body BD. It is something. 8 is AE
This is an AE mode change button for changing the mode,
Each time an immersive operation is performed, the AE mode is cyclically changed in the order of P mode → S mode → A mode → P mode.

[0025] Reference numeral 9 is a panoramic mode setting button, which is cyclically turned on and off with each immersive operation. When this panorama mode setting button 9 is in an ON state, panoramic photography is possible, and when it is in an OFF state, a normal photography mode is set. 10 is an up/down switch consisting of an up switch 10a and a down switch 10b for setting the trimming magnification, and 11 is a flash.

[0026] Also, J11 and J18 are interchangeable lenses LE
J12 to J17 are connection terminals for power supply to the zoom motor built into the camera body, and J12 to J17 are connection terminals for communication between the microcomputer μC1 in the camera body BD and the microcomputer μC2 in the interchangeable lens LE to exchange information. . Also, 12 in Figure 5
is the finder window.

Next, the optical system of the trimming camera according to the present invention will be explained. FIG. 6 is a configuration diagram showing an optical system of a photographing lens and a finder of a trimming camera according to the present invention. In the figure, 20 is a photographic lens system configured within the interchangeable lens LE. This photographic lens system 2
0 is a zoom lens equipped with a front group and a rear group (both not shown) inside the interchangeable lens LE. The focal length f of the photographing lens system 20 is changed by changing the positions of the front group and the rear group by such movement. Note that the interchangeable lens LE will be described later.

A main mirror 21 is arranged at an angle behind the photographing lens system 20. This main mirror 21 is composed of a partially transmissive mirror with a transmissive part or a small hole in the center of the reflective mirror surface, or a semi-transmissive mirror with a semi-transmissive mirror on the entire surface or only in the center, and allows the light flux from the photographic lens system 20 to pass through the main mirror 21. A part of the light beam is guided to a lower AF module 23 via a rear AF mirror 22, and the remaining light flux is guided to a finder optical system to be described later. The main mirror 21 and the AF mirror 22 are configured to be retracted upward from the optical axis upon receiving a release signal, and the photographing lens system 20
A subject image incident from the camera is exposed onto a film surface (not shown).

The AF module 23 is disposed at a position where the image passing through the photographic lens system 20 forms a primary image plane, and is used to perform triangulation, for example, from a subject image incident on an area corresponding to the AF area. The distance to the subject is measured using a known distance measuring method.

On the other hand, the light flux guided to the finder optical system is first guided to a focus plate 24 as a primary image plane disposed at a position where a primary image is formed, and an image is formed on the focus plate 24. be done. A mark 24a indicating an AF area is drawn on the surface of the focus plate 24. The above primary image is a mirror 25,
26, the image is transmitted as a secondary image of the subject to the field frame display member 29 via the relay lens 27 and the condenser lens 28.

The relay system lens 27 is composed of a plurality of lenses, and by moving a predetermined lens in the direction of arrow A or in the opposite direction according to the specified electronic zoom trimming magnification, the image magnification of the finder can be adjusted. It is something that can be varied. Further, the visual field frame display member 29 is constituted by an electro-optical element such as an LCD or an ECD, and a visual field frame 29a is formed by a light shielding portion provided at the peripheral portion of the visual field frame display member 29.

When photographing without using electronic zoom, the entire subject image formed on the focusing plate 24 is directly reflected in the field frame 2.
The image is formed on the entire surface of 9a. On the other hand, as the electronic zoom is performed, the image magnification of the relay lens 27 increases, and for example, when the electronic zoom is 2 times, an image in a range 24b shown by a broken line on the focus plate 24 is formed on the entire field frame 29a.

The light from the field frame 29a is guided to an eyepiece 31 via a mirror 30, and a secondary image on the field frame 29a is observed through the eyepiece 31. Note that the image observed with the eyepiece lens 31 differs when the magnification of the relay lens 27 is increased and when the photographing lens system 20 is used as a telephoto lens.
) will be enlarged in the same way as when zooming to the side. At this time, since the AF area mark 24a that is observed at the same time is drawn at a constant size on the primary image plane of the focusing plate 24, it is always observed at a constant size when using optical zoom, but when using electronic zoom Since the image is enlarged by the relay lens 27, the size is enlarged according to the trimming magnification when observed.

The mirror 30 is a half mirror, and a part of the light beam forming the image on the field frame 29a passes through the mirror 30 and is guided to the photometric optical system 34. The photometric optical system 34 is composed of a photometric lens 32 and a light receiving element 33, and the photometric lens 32 re-forms an image on the light receiving element 33. The photometry area has a fixed positional relationship with respect to the secondary image plane, so regardless of the electronic zoom or optical zoom status,
It always has a constant size and position relative to the observed field of view. The output signal of this light receiving element 33 is used for exposure calculation for exposure control.

Next, the interchangeable lens LE will be explained. Figure 7 shows the power zoom mechanism (photographing lens system 2
FIG. 2 is an external view of an interchangeable lens LE having a mechanism for driving a zoom lens group LE.

In the figure, reference numeral 40 denotes a zoom operation ring, which is rotated to instruct the direction and speed of power zoom. Also, 41 is a lock groove, 42 is an AF
The coupler 43 is an aperture lever. The camera body B
When the interchangeable lens LE is attached to D, the mount lock pin 5 engages with the lock groove 41 and the interchangeable lens LE
is fixed to the camera body BD. In addition, the camera body BD
The convex portion of the side AF coupler 6 engages with the concave portion of the AF coupler 42, and the rotational force of the AF motor on the camera body BD side is applied to the focus adjustment lens in the interchangeable lens LE via the AF coupler 6, 42. It becomes possible to transmit to the group. This allows AF
A focusing operation of the interchangeable lens LE is performed by the driving force of the motor. Further, the aperture lever 7 on the camera body BD side engages with the aperture lever 43 on the interchangeable lens LE side, and the aperture lever 7
By driving the aperture lever 43, the aperture provided in the interchangeable lens LE is controlled.

In addition, J1 and J8 are power supply connection terminals for the zoom motor (not shown), and J2 to J7 are connection terminals for power supply to the camera body BD.
These are connection terminals for communication for exchanging information with the camera body BD, and are connected to the connection terminals J11 to J18 on the camera body BD side, respectively.

FIG. 8 is an external view of a manual zoom type interchangeable lens LE' in which the zoom lens is driven by manual operation. Since the interchangeable lens LE' does not have a built-in drive motor, its appearance is similar to that of the interchangeable lens LE, except that the power supply connection terminals J1 and J8 are not provided.
is almost the same as The zoom operation ring 40' is a manual zoom operation ring, and by rotating the zoom operation ring 40', the zoom lens group of the interchangeable lens LE' is mechanically moved.

FIG. 9 shows the configuration of the photographing lens system 20 in the interchangeable lenses LE, LE', and Table 1 shows the following:
This figure shows the configuration of each lens at a focal length of 32 mm.

The photographing lens system 20 includes three lenses L1 to
It consists of a positive front group I consisting of L3 and a negative rear group II consisting of two lenses L4 and L5, and the focal length f is 32~
It can be changed within a range of 102mm. Also, 50
is a movable light shielding plate, which moves toward the object side (extended in front of the camera) as you zoom from the wide-angle side to the telephoto side, and blocks unnecessary off-axis light (especially the light rays on the lower side near the farthest off-axis).
It blocks light. Further, 51 is an aperture.

[0041]

[Table 1]

In Table 1, ri (i=1 to 11) is the radius of curvature of the lens surface of each lens in order from the object side (left side in FIG. 9), and di (i=1 to 10) is the axis of each lens surface. Ndi and νi (i=1 to 5) are the refractive index and Abbe number of the lenses L1 to L5, respectively. Also,*
The mark indicates that it is an aspherical surface.

Note that the aspherical shape X(y) and the reference spherical shape X0(y) have the origin at the apex of the surface of the lens, the direction of the optical axis L as the X-axis, and the direction perpendicular to the optical axis L as the Y-axis. , is determined by the following equations (1) and (2) using the aspheric coefficient A2i (i=1 to 5) and the quadratic surface parameter ε shown in Table 2.

[0044]

[Math 1]

[0045]

[Table 2]

In FIGS. 10 to 14, the focal length f is 32 mm, 36.6 mm, 68.6 mm, and 87.5 mm, respectively.
, 102 mm, the moving positional relationship and optical path of the movable light shielding plate 50, the front lens group I, and the rear lens group II are shown. Further, Table 3 shows the values of the distance d1 between the lens surfaces of the movable light shielding plate 50 and the lens L1 and the zooming interval d7 (the distance between the surfaces of the lenses L3 and L4) at each focal length.

[0047]

[Table 3]

In the following explanation, the focal length f
= 36.6 mm, 68.6 mm, and 102 mm, for convenience of explanation, the conventionally expressed focal length values of 35 mm, 70 mm, and 105 mm will be used, respectively.

The movable light-shielding plate 50, the front lens group I, and the rear lens group II move toward the object side as the lens zooms from the wide-angle side to the telephoto side (see FIGS. 10 to 14). During this zooming, the movable light-shielding plate 50 is extended so that the distance d1 increases, and by blocking unnecessary off-axis light, the imaging range on the film plane F is regulated within a predetermined range.

That is, focal length f=35 mm to 70 m
In the m range, the exposure size is similar to that of a normal 35-70mm zoom lens (see Figures 11 and 12).
, on the wide side of this range, shooting is performed in panoramic mode, and as described later, the size y' (=19.14 mm) in the height direction of the film plane F is changed to the size y' of f = 35 mm.
(=21.63mm) to reduce the burden of aberration correction in the optical system on the wide side (Figure 1
(see 0).

On the other hand, on the telephoto side from f=70 mm, zoom shooting is performed using a combination of optical zoom and electronic zoom, as will be described later, and a predetermined trimming magnification is set in accordance with the focal length f. . Therefore, since the exposure image of the film is enlarged by the trimming magnification, the imaging range can be narrowed, so the size y′ in the height direction
can be set short, and the burden of aberration correction on the optical system is reduced even on the telephoto side. For example, focal length f
= 87.5 mm, the trimming magnification is approximately 1.33 times, so the size y' is 16.2 (= 21
．． 63/1.33) mm (see Figure 13). Also,
When the focal length f=102 mm, the trimming magnification is set to 2x, so the size y' is 10.8 (=21
．． 63/2) mm (see Fig. 14).

For reference, FIGS. 15 to 19 show focal lengths of 32 mm, 36.8 mm, 68.6 mm, and 87.5 m.
The aberration characteristics at m and 102 mm are shown. In each figure, (a) shows spherical aberration, (b) shows astigmatism, and (c) shows distortion.

As described above, the trimming camera according to the present invention corrects the aberrations of the photographic lens system 20 by performing photography in panoramic mode on the wide side and using both optical zoom and electronic zoom on the telephoto side. This makes it possible to construct a zoom lens with high magnification. As a result, the number of lenses can be significantly reduced compared to conventional zoom lenses, and the interchangeable lens LE
It is possible to reduce the cost and shorten the lens length.

Next, the relationship between optical zoom and electronic zoom will be explained. As mentioned above, the trimming camera according to this embodiment is equipped with a 32 mm to 105 mm zoom lens and has a 1 to 2 times electronic zoom function, so by combining optical zoom and electronic zoom, Focal length (this focal length is called the pseudo focal length f
It is possible to perform zooming from 32 mm to 210 mm.

FIG. 20 is a diagram showing a magnification program line for a pseudo focal length feq that combines optical zoom and electronic zoom. In the same figure, there is a type A (indicated by a solid line) in which the pseudo focal length feq changes along the path of point p → point a' → point b' → point c; B type (indicated by a dashed line) that changes along the path of points is shown. Note that the number in parentheses at each point indicates the value of the pseudo focal length feq.

The magnification program line A is a magnification program line that optically magnifies the subject image as much as possible and prioritizes image quality.
Applies to non-flash photography in program) mode. On the other hand, the magnification program line B is a magnification program line that prioritizes photographing that takes advantage of the zoom function as much as possible even if the image quality is degraded.

In magnification program line B, when the pseudo focal length feq is the same, the aperture F value of the interchangeable lens LE is smaller than in magnification program line A, so camera shake is less likely to occur and the flash light reaches a longer distance. Therefore, it is applied to flash photography in S (shutter speed priority) mode and P (program) mode of AE mode.

In the figure, when the focal length f of the photographic lens system 20 is less than 35 mm, panoramic mode photographing is performed and zooming is possible only by optical zoom.

[0059] When the pseudo focal length feq is 35 mm or more,
The magnification program line A gives priority to optical zoom, and the magnification program line B gives priority to electronic zoom. That is, the magnification program line A is 35 mm.
When ≦feq≦70mm, the trimming magnification of the electronic zoom is 1x, which is the same as a normal optical zoom, and the shooting lens system 2
The focal length of zero is f=feq. Also, 70mm
<feq, the pseudo focal length feq is distributed along the slope of the magnification program line A into a predetermined focal length f and a trimming magnification Mf. The distribution of the focal length f and the trimming magnification Mf is calculated by the following equation.

feq=Mf・f
...■Mf=(f-70)/(f
max-70)+1...fmax; the longest focal length of the photographic lens system 20 (i.e., in this embodiment, fmax
x=105mm) On the other hand, the magnification program line B is 3
When 5 mm≦feq≦70 mm, the focal length f of the photographic lens system 20 is fixed at 35 mm, and only the trimming magnification Mf of the electronic zoom changes between 1 and 2 times. Also, 70mm
<feq, the trimming magnification Mf of the electronic zoom is fixed at 2x, and the focal length f changes within a range of 35 mm to 105 mm. That is, the magnification program line B is f
Electronic zoom only when eq≦70mm, 70mm<feq
In this case, the zoom method can be switched so that only optical zoom functions.

Next, the system configuration of the above trimming camera system will be explained. Figure 1 shows the camera body BD
FIG. In the same figure, μC1 is
It is a microcomputer that controls the operation of the entire camera and performs various calculations, and includes a memory M in which conversion tables such as the magnification program lines A and B are stored, and a timer T for exposure control.
, MT, and CT. AFCT is a light receiving circuit for focus detection, and includes a focus detection CCD (solid-state image sensor) and the CCD.
It includes a CD drive circuit and an output circuit that A/D converts the output signal of the CCD and outputs it to the microcomputer μC1, and is connected to the microcomputer μC1 via a data bus DB. Mark 24 is detected by this focus detection light receiving circuit AFCT.
Information regarding the amount of defocus of the subject within the AF area indicated by a is obtained.

LM is a photometric circuit provided in the optical path of the finder optical system. This photometry circuit LM is an A/D
It has a conversion circuit, A/D converts the light reception signal received by the light reception element 33 (see FIG. 6), and outputs it as a serial signal to the microcomputer μC1 as subject brightness information.

DX is a film sensitivity reading circuit that reads film sensitivity data provided in the film container and outputs the data to the microcomputer μC1. This sensitivity data is sent out as a serial signal.

DISPC controls the display section D based on the display data and display control signal output from the microcomputer μC1.
This is a display control circuit that performs predetermined display on the ISP1 and the display section DISP2. Note that the display section DISP1 is an on-body display section (corresponding to the display section 4 in FIG. 4), and the display section D
ISP2 is an infinder display section (corresponding to the display by the visual field frame display member 29 in FIG. 6).

LECT is an intra-lens circuit built into the interchangeable lens LE. This in-lens circuit LECT is
Specific information of the interchangeable lens LE, such as the longest focal length fm
ax, the shortest focal length fmin, the aperture F value, and the conversion coefficient (K value) for converting the defocus amount into the lens driving amount, etc., are output to the microcontroller μC1, and the zoom lens group and other information are output based on the lens data from the microcontroller μC1. It drives the focusing lens group and controls changes in the focal length f of the photographic lens 20 and focusing operations, and details will be described later. M1 is an AF motor that drives the focusing lens group in the interchangeable lens LE via the AF couplers 6 and 42. Further, MD1 is a motor drive circuit that drives the AF motor based on a control signal and drive data from the microcomputer μC1. The operations of the AF motor M1, such as forward rotation, reverse rotation, and stopping, are controlled by a motor drive circuit MD1.

TVCT is a shutter control circuit that controls the shutter based on a control signal from the microcomputer μC1. Further, AVCT is an aperture control circuit that controls the aperture amount of the aperture 51 based on a control signal from the microcomputer μC1. Exposure control of the trimming camera according to the present invention will now be explained. FIG. 21 is a side view of a main part showing an exposure control mechanism using a known focal plane shutter. In the figure, the same members as those shown in FIG. 6 are given the same numbers. Further, 35 is the relay system lens 2.
7, a finder optical system consisting of a condenser lens 28, a field frame display member 29, a mirror 30, an eyepiece 31, etc., 36 a photometry circuit including the photometry optical system 34, 52 and 53 a front curtain of a shutter that runs up and down; The rear curtain 54 is a film, and 55 is a screen frame that regulates the exposure area of the film 54 during normal photography.

FIG. 22 is a diagram showing the exposed area of the film 54. In the figure, 60 is a cartridge containing the film 54 in a roll, and 54a is a perflation hole for controlling the frame position of the film 54. Further, 61 is an exposure area during normal shooting, which is an area regulated by the screen frame 55, 62 is an exposure area during trimming shooting, and 63 is an exposure area during panoramic shooting. In cropping photography, the exposure area 62 changes according to the trimming magnification Mf, and the exposure range y in the height direction is the same as during normal photography when the minimum magnification is Mfmin (=1x), and when the maximum magnification is Mfmax (=2x). The exposure range is approximately half of the exposure range at the time of shooting.

As described above, during panoramic photography and cropping photography, the actual exposure area, that is, the printing area, is narrower than during normal photography. In particular, since the exposure range becomes narrower in the running direction of the front curtain 52 and rear curtain 53 of the focal plane shutter, the actual exposure timing becomes relatively delayed accordingly. In this embodiment, as will be described later, during trimming shooting or panoramic shooting, the running timing of the front curtain 52 and the rear curtain 53 is advanced by the actual exposure timing delay time, so that the exposure timing is the same as that during normal shooting. I'm trying to get it. Therefore, for example, the exposure timing of the exposure area at the center of the film surface is set to be earlier during trimming photography or panoramic photography than during normal photography.

A specific exposure control operation will be explained using FIG. 23. First, exposure control during normal shooting will be explained. In the time chart of the running waveforms of the front curtain and rear curtain, the release magnet, etc. in FIG. 23, the operations during normal photography are shown by dashed lines, and the operations during trimming photography are shown by solid lines.

When the release switch S2 shown in FIG. 1 is turned on and exposure control is instructed, a release magnet (not shown) is energized, and the diaphragm 51 and the main mirror 21 are released from the locked state. As a result, the aperture 51 starts to narrow down from the open state, and stops when the aperture reaches a predetermined control aperture value (movement in the direction of the arrow in FIG. 21). Additionally, the main mirror 1 and the AF mirror 22 start retracting upward from the optical path, come into contact with the stopper, and stop (Fig. 21
movement in the direction of the arrow).

Further, when the release switch S2 is turned on, the holding magnets (not shown) for the front curtain 52 and the rear curtain 53 are turned on.
At the same time, a timer T that measures the running timing t1 of the front curtain 52 starts counting. This running timing t1 is longer than the release time lag tL by the front curtain 5.
The time from the start of travel of No. 2 to the start of exposure of the exposure area (film surface) (point A in the figure) is a shorter time by t'.

Note that the release time lag tL is a delay time from the start of exposure to the start of exposure of the film surface of the front curtain 52, and is the timing at which the movement of the aperture 51, main mirror 21, etc. completely ends. ing. Also, during this release time lag tL, no exposure is performed and the focus may shift due to camera shake or movement of the subject, so during this time the focusing lens group of the photographic lens system 20 is driven to correct the focus. It has become.

When the timer T finishes counting,
The holding magnet for the front curtain 52 is turned off, and the front curtain 52 starts running. Further, the timer CT starts counting a predetermined exposure time tV. When the counting of the exposure time tV is completed, the holding magnet of the trailing curtain is turned off, the trailing curtain starts running, the diaphragm 51, the main mirror 21, etc. are restored, and the shutter charge is started at timing t2 (hereinafter referred to as t2). , called return timing)
The timer MT starts counting.

The return timing t2 is the timing (point D in the figure) when the rear curtain 52 completely blocks the exposure area (film surface). When the count of the timer MT ends, the exposure ends, and the aperture 51, main mirror 21, etc. return and shutter charging starts.

During trimming photography or panoramic photography, the running timing t1 of the front curtain 52 and the running timing t3 (=t1+tV) of the trailing curtain 53 correspond to the trimming magnification M.
The predetermined time Δt1 based on f is shortened, and
The return timing t2 is a predetermined time Δt2 (≒2Δt1)
The travel of the front curtain 52 and the rear curtain 53 and the aperture 5 are shortened by
Movement of the first class is controlled.

The predetermined time Δt1 is the running time between the exposure start point A of the film surface of the front curtain 52 and the exposure start point B of the print area, and by advancing the running timing of the front curtain 52 by this time Δt1, Based on the actual exposure area, the release time lag tL regardless of the shooting mode
becomes constant. That is, the exposure start point C of the print area of the front curtain 52 is at the same timing as the exposure start point A.

As described above, by advancing the running timing of the front curtain 52, the exposure timing in the center of the screen, where the main subject is often located, becomes earlier, and for example, movement of the subject may cause a focus shift during the release time lag tL. Even in this case, the amount of deviation will be smaller than during normal shooting. On the other hand, since correction of focus deviation is performed during the same release time lag tL as during normal photographing, focus correction becomes easier and accuracy improves as lens driving of the forcing lens group is reduced.

Further, the predetermined time Δt2 is the running time between the exposure end point E of the print area of the trailing curtain 53 and the exposure end point D of the film surface (≒Δt1) in the shortened time Δt1 of the running timing t3 of the trailing curtain 53. is added. By shortening the return timing t2, the time during which the subject image is not visible in the finder is shortened, and the photographing operation can be carried out quickly by that much, so that no shutter opportunity is missed. Furthermore, since the overall time required for exposure control is shortened, it is possible to speed up continuous shooting and moving object shooting.

Returning to FIG. 1, M2 is a motor for winding and rewinding the film and charging the shutter mechanism. Further, MD2 is a motor drive circuit that drives the motor M2 based on a control signal and drive data from the microcomputer μC1.

M3 is the relay lens 2 in the finder.
There is a motor that drives 7. Also, MD3 is a microcomputer μ
This is a motor drive circuit that drives the motor M3 based on the control signal and drive data from C1. The relay lens 27 has a trimming magnification Mf set at the time of electronic zoom.
It is driven by motor M3 in accordance with.

EZEN is an encoder for detecting the focal length fR of the relay lens 27. In addition,
The corresponding magnification can be found from the detected focal length fR of the relay lens 27, but since this magnification corresponds to the trimming magnification Mf, the detection information by the encoder EZEN is based on the currently set electronic zoom trimming magnification M.
It is treated as information of f.

The WRT is a data writing circuit that magnetically or optically records photographic data such as whether or not panoramic photographing is being performed and the trimming magnification Mf on the film 54.

FL is a flash circuit, and FLC is a flash control circuit that controls the start and stop of light emission of the flash FL. This flash control circuit has a light receiving element for light adjustment (not shown) disposed facing the film 54 of the camera body BD, and the light reflected from the film 54 by the light receiving element for light adjustment (flash light). The amount of light emitted by the flash FL is controlled based on the amount of light received.

Next, the power supply relationship of the above-mentioned trimming camera will be explained. E1 is a power battery for the camera body BD. Tr1 is a first transistor that supplies power VCC1 to the focus detection light receiving circuit AFCT and the photometry circuit LM. This transistor Tr1 is a microcomputer μC
It is controlled by the power supply control signal SPW1 output from the PW1 terminal of 1, and is turned on when the power supply control signal SPW1 is at a high level. Further, Tr2 is a second transistor that supplies a power supply VCC2 to the intra-lens circuit LECT of the interchangeable lens LE and a zoom motor M4 to be described later. This transistor Tr2 is composed of a MOS-FET, and is controlled by a power supply control signal SPW2 outputted from a PW2 terminal of the microcomputer μC1, and is turned on when the power supply control signal SPW2 is at a high level.

DD is connected from the power supply battery E1 to the microcomputer μC1.
, film sensitivity reading circuit DX, display control circuit DISPC
, a DC/DC converter for stabilizing the power supply VDD supplied to the encoder EZEN of the relay lens 27, the data write circuit WRT, and the in-lens circuit LECT. This DC/DC converter DD is driven by a power supply control signal SPW output from the PW0 terminal of the microcomputer μC1.
0, and operates when the power supply control signal SPWO is at a high level.

Note that the motor drive circuits MD1 to MD3
, shutter control circuit TVCT, aperture control circuit AVCT,
The flash circuit FL and flash control circuit FLC are
It is directly driven by the power supply battery E1, and is supplied with the battery voltage VCC0 of the battery E1.

D1 to D3 are DC/DC converters DD
This is for supplying a voltage lower than the voltage VDD to the microcomputer μC1 when the microcomputer μC1 is not operating, and driving the microcomputer μC1 with low power. This low voltage value is set to the lowest voltage value at which the microcontroller μC1 can operate, and D
When the C/DC converter DD stops operating,
Only the microcomputer μC1 is driven.

GND1(A) is the ground line of the low power consumption section. The GND1 terminal of the in-lens circuit LECT is connected to the GND in the camera body BD via connection terminals J7 and J17.
Connected to the ND1 line. In addition, GND2 (B) is
This is the ground line of the large power consumption section. Inner lens circuit L
The GND2 terminal of the ECT is connected to the GND1 line inside the camera body BD via connection terminals J8 and J18.

Next, switches will be explained. SRE1: A battery attachment detection switch that detects that the power supply battery E1 is attached. When battery E1 is installed, it is in the off state, which causes capacitor C1 to connect to resistor R
1, and the reset terminal R of the microcomputer μC1
E1 changes from low level to high level. The microcomputer μC1 executes a reset routine to be described later in response to the level change of the reset terminal RE1.

SMOD: AE mode change switch. Turn on the AE mode change button 8 every time you immerse yourself,
AE mode is changed.

SPA: Switch for setting/cancelling panorama mode. The panorama mode setting button 9 is turned on each time the user is immersed, and the setting and cancellation of the panorama mode is cyclically changed.

S1: A photography preparation switch that is turned on when the release button 2 is pressed halfway. Note that when this switch S1, the AE mode change switch SMOD, the panorama mode setting/cancellation switch SPA, and any of the up/down switches SZU and SZD (described later) are turned on, an interrupt signal is sent to the interrupt terminal INT1 of the microcomputer μC1. The information is input, and photographing preparation operations such as photometry and AF operations are performed.

SM: Main switch that is turned on when slider 1 is in the on position. It should be noted that each time the main switch SM changes from on to off or from off to on, a low level pulse is generated from the pulse generator PG1, and this pulse signal is input to the interrupt terminal INT2 of the microcomputer μC1.

S2: A release switch that is turned on when the release button 2 is fully pressed. When the release switch S2 is turned on, exposure control is performed.

SMU: A switch that increases the shutter speed TV or aperture value AV according to the set AE mode. It turns on every time the up switch 3a (see FIG. 4) is operated. Each time this switch SMU is turned on, the shutter speed TV or aperture value AV is increased in units of 0.5 EV.

SMD: A switch that reduces shutter speed TV or aperture value AV according to the set AE mode. The down switch 3b (see FIG. 4) is turned on every time it is operated. Each time this switch SMD is turned on, the shutter speed TV or aperture value AV is decreased by 0.5 EV.

SZU: A switch for increasing the trimming magnification Mf of electronic zoom. up switch 10
It turns on every time a (see FIG. 4) is operated. Each time this switch SZU is turned on, the trimming magnification Mf is increased by 0.1.

SZD: A switch for decreasing the trimming magnification Mf of electronic zoom. down switch 10
It turns on every time b (see FIG. 4) is operated. Each time this switch SZD is turned on, the trimming magnification Mf is decreased by 0.1.

Next, communication of serial data will be explained. The photometry circuit LM, film sensitivity reading circuit DX and display control circuit DISPC have serial data input SIN,
Serial data output SOUT and serial clock SC
Data is communicated with the microcomputer μC1 via each signal terminal of K. Further, a chip select signal is input from the microcomputer μC1 to the chip select terminal CSLM of the photometric circuit LM, the chip select terminal CSDX of the film sensitivity reading circuit DX, and the chip select terminal CSDISP of the display control circuit DISPC. .

The microcomputer μC1 specifies the communication partner by outputting a low-level chip select signal. For example, when the CSLM terminal of the microcomputer μC1 is set to low level, the photometric circuit LM is designated as the communication partner,
The microcomputer μC1 communicates serial data with the photometric circuit LM via signal terminals of serial data input SIN, serial data output SOUT, and serial clock SCK.

[0101] Furthermore, the serial data input SIN, the serial data output SOUT, and the serial clock SCK
The signal terminals are connection terminals J5, J15, and J4, respectively.
, J14 and J6, J16 to the SOUT, SIN, and SCK terminals of the intra-lens circuit LECT in the lens LE. Further, a chip select signal is input from the microcomputer μC1 to the chip select terminal CSLE of the intra-lens circuit LECT via connection terminals J3 and J13.

When a low-level chip select signal is input from the microcomputer μC1, the lens internal circuit LECT is designated as the communication partner, and the microcomputer μC1 selects the internal lens circuit LECT, serial data input SIN, serial data output SOUT, and serial clock. Serial data is communicated with the lens internal circuit LECT via each signal terminal of SCK.

Next, the intra-lens circuit LECT will be explained. FIG. 2 is a circuit configuration diagram of the intra-lens circuit LECT. In the same figure, μC2 communicates data with the microcomputer μC1 in the camera body BD, changes the focal length f of the photographic lens system 20 in the interchangeable lens LE, performs focusing operations, etc.
Alternatively, it is a microcomputer that controls exposure control operations. Signals for data communication are input and output via connection terminals J3 to J6. From the connection terminals J3, J4, and J5, the microcomputer μ
A chip select signal, a communication clock, and serial data are input from C1, and the serial data is output from connection terminal J6 to microcomputer μC1.

Further, the RSIC is a reset IC for resetting the operation of the microcomputer μC2 when the power supply voltage VDD supplied from the camera body BD becomes less than a predetermined driving voltage of the microcomputer μC2. Also, R2 and C
2 is a resistor and a capacitor that generate a reset signal input to the reset terminal RE2 of the microcomputer μC2. The microcomputer μC2 performs a reset operation when the reset terminal RE2 changes from low level to high level.

ZVEN is the zoom direction and zoom amount (focal length change amount) from the operating position of the zoom operation ring 40.
This is an encoder that detects. Further, ZMEN is an encoder that detects the absolute position (not shown) of the zoom operation ring 40. Further, DVEN is an encoder that detects the amount of extension from the infinite position at each focal length.

M4 and MD4 are a zoom motor for driving the zoom lens group and the zoom motor M4, respectively.
This is a motor drive circuit that controls the drive of the motor. The motor drive circuit MD4 controls the rotational drive of the zoom motor M4 based on the drive direction and drive speed control signals sent from the microcomputer μC2, and stops and controls the zoom motor M4 based on the motor stop and motor pause control signals. Controls pause drive.

[0107] In SLE, the interchangeable lens LE is attached to the camera body B.
This is a lens attachment detection switch that turns off when it is attached to D and the mount is locked. When the interchangeable lens LE is not attached, the switch SLE is on and the reset terminal RE2 of the microcomputer μC2 is at a low level.

When the interchangeable lens LE is attached to the camera body BD, the switch SLE is turned off and the power supply voltage VDD
is applied to the capacitor C2 via the resistor R2, thereby charging the capacitor C2, and after a predetermined period of time, the reset terminal RE2 of the microcomputer μC2 changes from low level to high level. The microcomputer μC2 performs the reset operation in response to this level change. Further, D5 is a diode for preventing backflow. FIG. 3 is a circuit diagram of the intra-lens circuit LECT' of the manual zoom interchangeable lens LE'. The figure shows the lens internal circuit LEC shown in FIG.
The components related to the zoom motor, such as the zoom motor M4 of T, motor drive circuit MD4, encoder ZVEN, and connection terminals J1 and J8, are omitted, so a description thereof will be omitted.

Next, the photographing operation of the trimming camera will be explained using the flowcharts of FIGS. 24 to 43.

When the battery E1 is attached to the camera body BD, the battery attachment detection switch SRE1 (see FIG. 1) is turned off, the capacitor C1 is charged via the resistor R1, and a high voltage signal is sent to the reset terminal RE1 of the microcomputer μC1. A reset signal is input. Upon input of this reset signal, the microcomputer μC1 activates a built-in clock generator (not shown) to generate a clock, and also sends a high power supply control signal SPW0 from the PW0 terminal to activate the DC/DC converter DD. , switch the power supply voltage VDD to the normal drive voltage. After this, the microcomputer μC1 executes a reset routine of the main flow shown in FIG.

[0111] In the reset routine, first, the input of all interrupt signals is prohibited, and the input/output ports of various signals and the contents of internal registers are reset (#5, #
10). This reset operation initializes the AE mode to P mode and the photographing mode to normal photographing mode. Subsequently, it is determined whether the main switch SM is on (#15). In addition, main switch SM
changes from ON to OFF or from OFF to ON,
If there is an interrupt from the main switch SM,
The "SMINT" interrupt routine is executed.

If the main switch SM is in the OFF state at #15, signal interrupts from switches other than the main switch SM are prohibited (#60), and the transistor Tr1
, Tr2 is turned off, and power supply to each circuit and the interchangeable lens LE is stopped (#65). Subsequently, the drive of the DC/DC converter DD is stopped (#70), signal interrupts from switches other than the main switch SM are prohibited (#75), and a halt state (halt state) is entered.

In this stopped state, the generation of the clock and the operation of the DC/DC converter DD are stopped, and the microcomputer μC1 periodically checks the presence or absence of an interrupt signal. In this stopped state, when an interrupt signal is input from the main switch SM, the same operation as when the battery is installed is performed, and the microcomputer μC1 starts normal operation.

[0114] Also, in #15, when the main switch SM is on, interrupts of all signals are permitted (#15).
20), transistors Tr1 and Tr2 are turned on to supply power to each circuit and the interchangeable lens LE side (#25)
). Next, the "focal length initialize" subroutine is executed to set the focal length f of the photographic lens system 20 to a predetermined initial state depending on the type of the attached interchangeable lens LE or LE' and the set photographing mode.

FIG. 25 shows the "focal length initialization" subroutine. When the "focal length initialization" subroutine is called, "lens communication I" is first performed.
The subroutine is executed and the attached interchangeable lens LE
Alternatively, the lens information of LE' is read (#100).

FIG. 26 shows the "lens communication I" subroutine. When the "lens communication I" subroutine is called, first, the chip select terminal CSLE goes low (L).
level, and the lens circuit LECT or LECT' is specified as the communication partner of the microcomputer μC1 (#4
00). Subsequently, the in-lens circuit LECT or LECT
Data indicating the type of lens (type data) is read from ''(#405). This type data is 1-byte data indicating the type, power zoom type or manual zoom type. Hereinafter, for convenience of explanation, the power zoom type interchangeable lens LE will be referred to as type A, and the manual zoom type interchangeable lens LE' will be referred to as type B.

[0117] Next, the type of the attached interchangeable lens is determined from the type data (#410), and if it is type B, information regarding the lens (lens data) is read (#415), and then the chip select Terminal CSLE is changed to high (H) level, data communication is finished, and #1
Return to 05. The lens data includes a current focal length f, a maximum focal length fmax, and a minimum focal length fmin.
, distance data d indicating the current photographing distance, a conversion coefficient (K value) for converting the aperture F value and the defocus amount into the lens driving amount.

On the other hand, in #410, if the attached interchangeable lens is type A, 1-byte data (communication mode data) indicating communication mode I is sent to the lens internal circuit LECT (#420, #425). . Next, after waiting for a certain period of time (#430), the lens data is read into the microcomputer μC1 (#435), and then the chip select terminal CSLE is changed to high (H) level (#430).
The data communication is ended and the process returns to #105.

In addition to the six types of data, the lens data includes zoom operation status and operation direction, and focal length range data (fpmin, fpmax) dedicated to panorama mode.
) and focal length range data (fEZmin, fEZmax) that are shared by electronic zoom and optical zoom. In this embodiment, focal length range data (fp
min, fpmax) are (32 mm, 35 mm), and focal length range data (fEZmin, fEZmax) shared with the electronic zoom and optical zoom are (70 mm, 10 mm).
5 mm) (see Figure 20).

Returning to FIG. 25, when the reading of the type data and lens data is completed, the type of the interchangeable lens is determined from the read type data (#105), and if it is the B type (NO in #105), shooting is started. Since the focal length f of the lens system 20 is not automatically controlled by the magnification program line A or B, the process returns to #35 of the main routine.

[0121] If the type of interchangeable lens is A type (#
105: YES), it is determined from the read lens data whether the current focal length f of the photographic lens system 20 is 35 mm or less (#110). If f≦35 mm, it is further determined whether the photographing mode is panoramic mode (#115). If the photographing mode is the panoramic mode, the current focal length f is within the photographable range exclusively for the panoramic mode, so the process returns to #35 of the main routine.

On the other hand, if the photographing mode is the normal photographing mode, the control focus is set to set the focal length f of the photographing lens system 20 at the wide end (f=35 mm) of the variable focal length range that can be photographed in the normal photographing mode. The distance fC is set to 35 mm (#120). Subsequently, after the drive control data for the zoom motor M4 is set (#130), the "lens communication II" subroutine is executed and the control focal length fC and drive control data are sent to the intra-lens circuit LECT ( #135). Note that the drive control data is 1-byte data that includes information such as the presence or absence of panoramic mode, the zoom-up direction, and the zoom stop position.

FIG. 27 shows the subroutine of "lens communication II". When the "lens communication II" subroutine is called, first, 1-byte data (communication mode data) indicating communication mode II is set (#500). Next, the chip select terminal CSLE is set to low (L) level to designate the lens internal circuit LECT as the communication partner of the microcomputer μC1 (#505), and the communication mode data is sent to the lens internal circuit LECT (#505). #510
). Subsequently, after waiting for a certain period of time (#515), the control focal length fC and drive control data are transferred to the lens internal circuit LE.
The signal is sent to CT (#520), and then the chip select terminal CSLE is changed to high (H) level (#525).
), the data communication is ended and the process returns to #35 of the main routine.

Returning to FIG. 25, if f > 35 mm in #110 (NO in #110), then the focal length f is 70 mm.
It is determined whether or not it is less than or equal to (#140), and if f≦70 mm, the current focal length f is within the photographable range in the normal photographing mode, and the process returns to #35 of the main routine. On the other hand, if f>70 mm, it is further determined whether the photographing mode is panoramic mode (#145).

If the shooting mode is the panoramic mode, the control focal length fC is set to 70 mm in order to set the focal length f of the shooting lens system 20 to the telephoto end (f=70 mm) of the variable focal length range that can be photographed in the panoramic mode. (#150), and then the above-mentioned #130 and #1
35, the control focal length fC and the zoom motor M
The drive control data No. 4 is sent to the intra-lens circuit LECT. Note that in the panoramic mode, the variable range of the focal length on the telephoto side is limited to 70 mm in order to prevent deterioration in image quality and so-called vignetting of flash light.

[0126] If the shooting mode is not the panorama mode in #145 (if it is the normal shooting mode), the trimming magnification Mf corresponding to the current focal length f is calculated based on the magnification program line A (#155). . As mentioned above, in the normal shooting mode, a predetermined zoom ratio that combines optical zoom and electronic zoom is set by magnification program line A or B (
(see FIG. 20), if the initial state of the focal length f of the interchangeable lens LE exceeds 70 mm, the magnification program line A is preferentially selected, and the trimming magnification Mf is calculated by the formula (2).

Next, the calculated trimming magnification Mf is set as the control magnification MfC of the relay lens 27 (#160), and the "relay lens control" subroutine is executed to adjust the magnification (focal length) of the relay lens 27. ) is set as the control magnification MfC (#165).

FIG. 28 shows a subroutine for "relay lens control". When the "relay lens control" subroutine is called, the trimming magnification Mf is first read from the encoder EZEN of the relay lens 27 (#60
0), it is determined whether the trimming magnification Mf is equal to the control magnification MfC (#605). If Mf=MfC (YES in #605), it is determined whether the flag M3MVF is set to 1 (#635). This flag M3MVF is a flag indicating whether or not the motor M3 is being driven. If it is set to 1, it indicates that the motor is being driven, and if it is reset to 0, it indicates that the motor is stopped.

[0129] If the flag M3MVF is reset to 0, the magnification Mf of the relay system lens 27 is the control magnification MfC.
Since it is set to , the process returns to #35 of the main routine. Further, if the flag M3MVF is set to 1, the drive of the motor M3 is stopped (#640), the flag M3MVF is reset to 0, and the process returns to #35 of the main routine (#645).

[0130] If Mf≠MfC in #605, the magnification M
The drive of the motor M3 is controlled according to the magnitude relationship between f and the control magnification MfC (#610). Next, flag M3M
VF is set to 1 (#615), and the driving direction of motor M3 is determined (#620). If the driving direction of motor M3 is the telephoto side (zoom up) (YES in #620)
), and it is further determined whether the magnification Mf is 2 (
#625), if the magnification Mf=2, the telephoto end has been reached, so the drive of motor M3 is stopped (#640), the flag M3MVF is reset to 0, and the process returns to #35 of the main routine ( #645).

On the other hand, if the magnification Mf≠2 in #625,
Return to #600 and execute the loop from #600 to #625 above, and when Mf = MfC in #605, #63
5 to #645 to stop driving the motor M3,
The flag M3MVF is reset to 0 and the process returns to #35 of the main routine.

[0132] If the drive direction of the motor M3 is on the wide side (zoom down) in #620 (NO in #620), it is further determined whether the magnification Mf is 1 (#630
), if the magnification Mf=1, the wide end has been reached, so stop driving the motor M3 (#640), reset the flag M3MVF to 0, and proceed to #35 of the main routine.
Return to (#645).

On the other hand, if the magnification Mf≠1 in #630,
Return to #600 and execute the loop of #600 to #620 and #630 above, and when Mf = MfC in #605, proceed to #635 to #645, stop driving the motor M3, and set the flag. Reset M3MVF to 0 and return to #35 of the main routine.

Returning to FIG. 24, when the initialization of the focal length is completed, it is determined whether or not the switch S1 is on (#35). If the switch S1 is on, "
The subroutine "S1ON" is executed to prepare for photographing (#40). Next, it is determined whether or not the flag S1ONF is set to 1 (#45). If it is set to 1, the preparation for shooting is not completed, so the process returns to #40 and the flag S1ONF is reset to 0. At the point when the
The drive is stopped (#50, #55), resulting in a stopped state (halt state). On the other hand, if switch S1 is in the off state (NO in #35), #50 is reached without preparing for shooting.
, and the power supply is stopped to enter a halt state (halt state).

[0135] When the interrupt signal from switch S1 is input, the interrupt process of "S1INT" is executed,
Operation #35 is executed.

FIGS. 29 and 30 show the "S1 ON" subroutine. When the "S1 ON" subroutine is called, first, "S1INT" interrupt processing is prohibited (#200), transistors Tr1 and Tr2 are turned on, and power is supplied to each circuit and the interchangeable lens LE side. (
#205). Subsequently, the above-described "lens communication I" subroutine is executed to read lens data regarding the interchangeable lens LE (#210). Next, it is determined whether the switch S1 is on or not (#215), and if the switch S1 is on (YES in #215), the "zoom ratio change" subroutine is executed to change the AE mode. Accordingly, the combination of the focal length of the optical zoom and the trimming magnification of the electronic zoom is changed (#220).

FIG. 31 shows a subroutine for "zoom ratio change". When the "zoom ratio change" subroutine is called, first, the encoder EZEN of the relay lens 27 is
The trimming magnification Mf is read from (#700). Next, it is determined whether the interchangeable lens LE is A type (power zoom) or not (#705). If the interchangeable lens LE is not A type (NO in #705), the zoom ratio will not be changed, so "#2 of the “S1 ON” subroutine
25 (FIG. 29). If the interchangeable lens LE is type A (YES in #705), it is determined whether the AE mode has been changed (#710). In addition, LM
R is a register indicating the contents of the AE mode before the change, and MR is a register indicating the AE mode after the change.

[0138] If there is no change in the AE mode (LMR=M
R, YES in #710), there is no need to change the zoom ratio, so the process returns to #225 of the "S1 ON" subroutine. If there is a change in AE mode (LMR≠MR
, #710: NO), and it is further determined whether the changed AE mode is P mode (#715). If the AE mode is P mode (YES in #715), the zoom ratio is changed when determining whether or not to emit a flash during exposure control, which will be described later, so the process returns to #225 of the "S1 ON" subroutine.

[0139] If the AE mode is not P mode (#71
5 (NO), then it is determined whether the AE mode is A mode or S mode (#720), and the determined AE
It is determined whether the magnification program line matches the mode (#725, #745). In other words, if the AE mode is A mode (YES in #720)
, it is determined whether the magnification program line is B type (#725), and if the AE mode is S mode (#
720: NO), it is determined whether the magnification program line is of type A (#745).

[0140] If the magnification program line is type A in A mode (NO in #725), or if the magnification program line is type B in S mode (NO in #745), what is the shooting mode and magnification program line? Since they match, the process returns to #225 of the "S1 ON" subroutine without changing the zoom ratio.

[0141] If the magnification program line is B type in A mode (YES in #725), #730 to #740
, #765 to #775, and after the process of changing the zoom ratio to the magnification program line A, "S
1 ON" subroutine #225.

That is, the focal length f of the photographic lens system 20
and the magnification Mf of the relay lens 27, the pseudo focal length feq is calculated using the above formula (#730). Subsequently, a control focal length fC that satisfies the magnification program line A and a control magnification MfC of the relay system lens 27 are determined from the pseudo focal length feq and the focal length f. Since the magnification program line A gives priority to optical zoom, the focal length f is first determined as the control focal length fC, and then the control focal length fC (=f) and the pseudo focal length fe
The control magnification MfC is determined from q.

[0143] Subsequently, after register ZL indicating the magnification program line is set to type A (#740),
The above-described "relay lens control" subroutine is executed to change and set the relay system lens 27 to the control magnification MfC (#765). Next, the control focal length fC and other zoom drive data necessary for driving the zoom lens are set (#770), and the above-mentioned "lens communication II" subroutine is executed to transfer the zoom drive data to the interchangeable lens LE.
The signal is sent to the intra-lens circuit LECT (#775).

[0144] If the magnification program line is A type in S mode (YES in #745), #750 to #775
After the processing for changing the zoom ratio to the magnification program line B is performed, the process returns to #225 of the "S1 ON" subroutine.

That is, the focal length f of the photographic lens system 20
The pseudo focal length feq is calculated from the above equation (#750) from the magnification Mf of the relay system lens 27 and the control focal length f that satisfies the magnification program line B from this pseudo focal length feq and the focal length f. The control magnification MfC of the system lens 27 is determined. Since the magnification program line B prioritizes electronic zoom, the trimming magnification Mf is first determined as the control magnification MfC, and then the control focal length fC is determined from the control magnification MfC (=Mf) and the pseudo focal length feq. It is determined.

Subsequently, after the register ZL is set to type B (#760), the process moves to #765 to #775, and after the relay system lens 27 is set to the control magnification MfC (#765), The control focal length fC and other zoom drive data are stored in the lens internal circuit LE of the interchangeable lens LE.
It is sent to CT (#770, #775).

Note that the process of changing the zoom ratio may be performed when the AE mode is changed. In this embodiment, since the AE mode is changed cyclically by the AE mode change button 8, the relay system lens 27 and the interchangeable lens L are changed every time the AE mode is changed.
In order to prevent the zoom lens group E from being driven, processing for changing the zoom ratio is performed when the photographing preparation switch S1 is operated. This can prevent unnecessary power consumption.

Returning to FIG. 29, when the zoom ratio changing process is completed, the "AF" subroutine is executed to perform a focusing operation (#225). FIG. 32 shows the "AF" subroutine. When the "AF" subroutine is called,
First, the light reception signal received by the CCD in the AF module 23 is integrated (#780). Next, this integrated light reception data is read into the microcomputer μC1 (#
781), and the defocus amount DF of the photographic lens system 20 is calculated based on the received light data (#782). continue,
The above-mentioned conversion coefficient, that is, K, is added to this defocus amount DF.
The lens drive amount N of the focusing lens group in the photographic lens system 20 is calculated by multiplying the values (#783). Then, the focusing lens group is driven based on this lens drive amount N, and focus adjustment of the photographing lens system 20 is performed (#784).

Returning to FIG. 29, when the AF operation is completed, the film sensitivity is read from the film sensitivity reading circuit DX (#230), and the brightness BV0 of the subject at the open aperture is read from the photometry circuit LM (#235). Next, a "key input" subroutine is executed, and the aperture value AV in the A mode or the shutter speed TV in the S mode is changed in accordance with the changing operation by the up/down switch 3 (#240).

FIGS. 33 and 34 show the "key input" subroutine. When the "key input" subroutine is called, first, the AE mode change switch SMOD is turned OFF.
It is determined whether or not it has changed from F to ON (#800)
. If the AE mode change switch SMOD has changed from OFF to ON (YES in #800), after saving the contents stored in register MR to register LMR (#805), the AE mode changes from the current mode. The mode is changed to the next one and stored in register MR (#810
). For example, if the current AE mode is P mode, P mode is stored in register LMR, and S mode is stored in register MR. AE mode change switch SMO
If D has not changed from OFF to ON (NO in #800), steps #805 and #810 are skipped.

[0151] Next, it is determined whether the up switch SMU or the down switch SMD has changed from OFF to ON by operating the up/down switch 3 (#815).
, #835), if it has changed (#815 or #835
(YES), aperture value AV according to the set AE mode
Alternatively, if the shutter speed TV has been changed and has not changed (NO in #815 and #835), the process moves to #855.

[0152] That is, the up switch SMU is OFF.
If it has changed from ON to ON (YES in #815), the content of the changed AE mode is determined (#820), and if the changed AE mode is A mode (YES in #820).
, after the aperture value AV is increased by 0.5EV (#825
), jump to #855, and if the AE mode after changing in #820 is S mode (NO in #820), the shutter speed TV is increased by 0.5EV (#830
), jump to #855.

[0153] Furthermore, if the down switch SMD has changed from OFF to ON (YES in #835), the content of the changed AE mode is determined (#840), and the changed A
If E mode is A mode (YES in #840), after the aperture value AV is decreased by 0.5EV (#845),
Jump to #855, and if the AE mode changed in #840 is S mode (NO in #840), the shutter speed TV is decreased by 0.5EV (#850),
Move to #855.

Next, it is determined whether the panorama mode setting/cancellation switch SPA has changed from OFF to ON (#855), and if it has not changed, the process returns to #245 of the "S1 ON" subroutine. If the panorama mode setting/cancellation switch SPA has changed, after converting between panorama mode (ON mode) and normal shooting mode (OFF mode) (#860), it is determined whether the interchangeable lens LE is A type or not. (#865).

[0155] The panorama mode setting/cancellation switch S
Panorama mode and normal shooting mode are converted alternately depending on the PA change, so if the current shooting mode is panorama mode (ON mode), normal shooting mode (
Conversely, if the current shooting mode is the normal shooting mode (OFF mode), it is converted to the panoramic mode (ON mode).

If the interchangeable lens LE is of type B in #865 (NO in #865), the process returns to #245 of the "S1ON" subroutine, and if the interchangeable lens LE is of type A (YES in #865), It is determined whether the changed shooting mode is panorama mode (FIG. 34, #
870).

[0157] If the shooting mode after conversion is panoramic mode (YES in #870), it is determined whether the focal length f of the shooting lens system 20 is within 70 mm (#875).
, if f≦70mm (YES in #875), it is within the shooting range, so #24 of the “S1 ON” subroutine
Return to step 5, and if f>70mm (N at #875)
O) Since it is outside the shooting range, the control focal length fC is set to 70 mm to change the focal length f of the photographic lens system 20 to 70 mm.
mm, and the control focal length fC and other zoom drive data are sent to the intra-lens circuit LECT of the interchangeable lens LE (#880, #895, #897).

On the other hand, if the converted shooting mode is the normal shooting mode (NO in #870), it is determined whether the focal length f of the shooting lens system 20 is within 35 mm (#8
85), if f>35mm (NO in #885), it is within the shooting range, so #2 of the "S1ON" subroutine
45, if f≦35mm (YES in #885), it is outside the photographable range, so the control focal length fC is set to 35mm to change the focal length f of the photographic lens system 20 to 35mm, and the control Focal length fC and other zoom drive data are from the lens internal circuit LECT of the interchangeable lens LE.
(#890, #895, #897).

Returning to FIG. 29, when the key input operation is completed, the "exposure calculation" subroutine is subsequently executed, and the control aperture value and control shutter speed are determined (#24
5).

FIG. 35 shows the "exposure calculation" subroutine. When the "exposure calculation" subroutine is called, first, a flag FLF indicating whether or not the flash is emitted is reset to 0, and the subject brightness at the open aperture is BV0,
A control exposure value EV is calculated from the open aperture value AV0 and film sensitivity SV (#900, #905). Note that the control exposure value EV is calculated by the following equation: EV=BV0+AV0+SV.

[0161] Subsequently, the AE mode is determined in #910 and #990, and if the AE mode is P mode (#91
0: YES), and in steps #915 to #970, the exposure control value of the P mode is calculated and the zoom ratio is changed according to the presence or absence of flash emission. If the AE mode is A mode (#9
90 is YES), the exposure control value in A mode is calculated in #995, and if the AE mode is S mode (#99
0 (NO), the control exposure value in S mode is calculated in #997, and the process returns to #250 of the "S1 ON" subroutine.

In calculating the control exposure value in the P mode, first, the control aperture value AVC and the control shutter speed TVC are determined from the control exposure value EV based on a preset AE program diagram (#915). . Subsequently, a pseudo focal length feq is calculated from the focal length f of the photographic lens system 20 and the magnification Mf of the relay system lens 27, and further, a shutter speed TVf at the limit of camera shake is calculated from this pseudo focal length feq (#920, #925). continue,
It is determined whether the control shutter speed TVC is equal to or higher than the camera shake limit shutter speed TVf (#930
), if the camera shake limit shutter speed is less than TVf,
In order to perform flash photography to prevent camera shake, the synchronized shutter speed TVX controls the shutter speed TV
C, and flag FLF is set to 1 (#935, #940).

[0163] Next, #945~#955, #975~
In #985, processing for changing the zoom ratio during flash emission is performed. That is, it is determined whether the magnification program line is A type (#945), and if it is A type, the magnification program line A is satisfied from the pseudo focal length feq and focal length f in order to change the zoom ratio. The control focal length fC and the control magnification MfC of the relay lens 27 are determined (#950).

Subsequently, after the register ZL is set to type B (#955), the relay system lens 27 is set to the control magnification MfC (#975), and the control focal length fC and other zoom drive data are exchanged. Sent to the lens internal circuit LECT of the lens LE (#980, #985)
, returns to #250 of the "S1 ON" subroutine. On the other hand, if the magnification program line is type B in #945, the zoom ratio will not be changed.
The process returns to subroutine #250 of "N".

[0165] If the control shutter speed TVC exceeds the camera shake limit shutter speed TVf in #930 (#
930 (NO), the flash will not emit light, so #9
In steps 60 to #985, processing for changing the zoom ratio when the flash is not emitted is performed. In other words, the magnification program line is B.
It is determined whether the type is the B type (#960), and if it is the B type, the pseudo focal length
From q and focal length f, control focal length fC that satisfies program line A and control magnification MfC of relay lens 27
is determined (#965).

Subsequently, after the register ZL is set to type A (#970), the relay system lens 27 is set to the control magnification MfC (#975), and the control focal length fC and other zoom drive data are exchanged. Sent to the lens internal circuit LECT of the lens LE (#980, #985)
, returns to #250 of the "S1 ON" subroutine. On the other hand, if the magnification program line is A type in #960, the zoom ratio will not be changed.
” Return to subroutine #250.

[0167] In the calculation of the control exposure value in A mode, priority is given to the aperture value, so the aperture value AV set in #825 or #845 is set as the control aperture value AVC, and the control aperture value AVC and the above Control shutter speed TVC (=EV-AVC) is determined from control exposure value EV (#995). In addition, in the calculation of the control exposure value in S mode, priority is given to the shutter speed, so
The shutter speed TV set in 30 or #850 is set as the control shutter speed TVC, and the control aperture value AVC (=EV - TVC) is determined from the control shutter speed TVC and the control exposure value EV (#99
7).

Returning to FIG. 29, when the exposure calculation is completed, a "zoom drive" subroutine is subsequently executed, and the zoom lens group of the interchangeable lens LE or LE' is driven (#250).

FIGS. 36 to 39 show the "zoom drive" subroutine. When the "zoom drive" subroutine is called, first the type of interchangeable lens is determined (#10
00), if it is a manual zoom type (B type), it moves to #1005 and the focal length f of the photographic lens system 20 is
The magnification Mf of the relay lens 27 is set to a predetermined control focal length fC and control magnification MfC, respectively, which are set by manual zoom. On the other hand, if the interchangeable lens is a power zoom type (A type), #1085 (Fig. 37
(see), the focal length f of the photographing lens system 20 and the magnification Mf of the relay system lens 27 are set to predetermined control focal length fC and control magnification MfC set by the power zoom, respectively.

[0170] If the interchangeable lens is a manual zoom type, it is first determined whether the shooting mode is panoramic mode (#1005), and if it is panoramic mode, electronic zoom will not be performed, so "S1 ON" is selected. Return to subroutine #255.

[0171] If the shooting mode is the normal shooting mode, the flag ZF indicating the presence or absence of electronic zoom is reset to 0 (
#1010), the electronic zoom trimming magnification Mf1 is calculated from the current focal length f of the photographic lens system 20 using the following equation (#1015). Mf1=(f-fmin)/(fmax-fmin)+
1...■However, fmin: The shortest focal length of the photographic lens system 20 (32 mm) fmax: The longest focal length of the photographic lens system 20 (105 m
m) Note that if the flag ZF is set to 1, it indicates that electronic zoom is being used; if it is reset to 0, it indicates that electronic zoom is not being used.

Next, the trimming magnification Mf of the electronic zoom
Up switch SZU or down switch S to change
It is determined whether ZD is on or not (#1025,
#1030). If both switches are off,
The presence or absence of electronic zoom is determined (#1070), and if electronic zoom is being performed (flag ZF=1), it is assumed that the electronic zoom operation has already been completed and the process returns to #255 of the "S1ON" subroutine. On the other hand, if the electronic zoom operation is not performed (flag ZF=0), the magnification Mf of the relay system lens 27 is changed to the control magnification MfC (=Mf1+ΔMf) obtained by correcting the magnification Mf1 by the correction value ΔMf (# 1075, #1080).

Note that the correction value ΔMf is the difference between the current magnification Mf of the relay system lens 27 and the calculated trimming magnification Mf1, that is, the amount of change in the magnification of the relay system lens 27 ΔMf=Mf−Mf1. The reason why the magnification Mf of the relay system lens 27 is reset to the control magnification MfC in #1075 and #1080 even though no electronic zoom operation has been performed is because the relay system lens 27 is Focal length f of the photographic lens system after changing the magnification Mf
This is to initialize the trimming magnification Mf that was set before the replacement, instead of the trimming magnification Mf1 corresponding to .

[0174] When the up switch SZU is on in #1025, the relay system lens 27 is driven to the telephoto side so that the magnification increases by 0.1 times more than the current magnification Mf (
#1045 to #1050), the correction value ΔMf is 0.1
At the same time, the flag ZF is set to 1 (#1060, #1065), and the process returns to #1020. From now on, every time the up switch SZU is turned on, #104
Steps 5 to #1065, #1020, and #1025 are executed, and the magnification Mf of the relay lens 27 is increased by 0.1 times. Then, the magnification Mf is at the telephoto end (Mf=2)
When reaching #1045, #1060, #1065, #1020, which skipped #1050 and #1055,
, #1025 is executed, and the relay system lens 27
The drive of is stopped.

[0175] Also, in #1030, the down switch SZD
is on, the relay lens 27 is driven to the wide side so that the current magnification Mf is reduced by 0.1 times (#1035, #1040, #1055), and then the correction value ΔMf is In addition to being revised by 0.1 times,
Flag ZF is set to 1 (#1060, #1065
), return to #1020. Hereafter, every time the down switch SZD is turned on, #1030~#1040, #1055~
Steps #1065, #1020 to #1030 are executed, and the magnification Mf of the relay lens 27 is reduced by 0.1 times. Then, when the magnification Mf reaches the wide end (Mf=1), #1035, #1060, #1065, #1020 to #1020 skipping #1040 and #1055
The loop #1030 is executed, and the driving of the relay lens 27 is stopped.

If the interchangeable lens is a power zoom type, first, the panorama data and flag ZF are reset, and the magnification M is output from the encoder EZEN of the relay lens 27.
f is read (#1085 to #1095). Subsequently, the "lens communication I" subroutine is executed to read lens data (#1095). Next, the presence or absence of power zoom and its direction are determined based on the information regarding the power zoom operation of the lens data, and then the presence or absence of an operation for changing the magnification of electronic zoom and its direction are determined (#1105 to #1105 to #1105). 1120).

[0177] If neither optical zoom nor electronic zoom has been operated (NO in #1120), flag Z
It is determined whether F is set to 1 (#112
5), if flag ZF is reset to 0, “S1
ON" subroutine #255. Furthermore, if the flag ZF is set to 1, it is determined that the zoom operation has been completed, and zoom stop data is sent to the interchangeable lens LE (#1130, #1135), and "S1 O
N'' subroutine #255.

[0178] If a zoom-up operation of optical zoom or electronic zoom is performed (Y in #1105 or #1115)
ES), the process moves to #1140 (see FIG. 38), and it is determined whether the shooting mode is the panoramic mode. If the shooting mode is panoramic mode, only optical zoom is performed, so data indicating panoramic mode and zoom drive data for zoom-up drive are set, and the "lens communication II" subroutine is executed to read these data. is sent to the lens circuit LECT in the interchangeable lens LE (#1145, #1195, #1200), and the flag ZF
After is set to 1 (#1205), the process returns to #1095. Thereafter, every time the optical zoom or electronic zoom zoom-up operation is performed, #1095 to #1105 (or #1115
), #1140, #1145, #1195-#1205
The loop is executed, and the modified data is sent to the lens internal circuit L.
Sent to ECT.

If the photographing mode is the normal photographing mode in #1140, a pseudo focal length feq is calculated from the focal length f of the photographing lens system 20 and the magnification Mf of the relay system lens 27 (#1150), and the pseudo focal length A predetermined zoom drive is performed for each of the photographing lens system 20 and the relay system lens 27 based on feq and the set magnification program line.

That is, the type of magnification program line is determined (#1155), and if the magnification program line is type A, the pseudo focal length feq is fEZmin.
(=70mm) or less (#116
0), if feq>fEZmin (=70mm),
The trimming magnification Mf1 of the electronic zoom is calculated from the focal length f by the following formula, and the trimming magnification Mf1 is set as the control magnification MfC, and the magnification Mf of the relay system lens 27 is set to the control magnification MfC (#1165 to #1175). Mf1=(f−fEZmin)/(fEZma
x-fEZmin)+1...■However, fEZmin;
The shortest focal length (70 mm) of the photographic lens system 20 in which electronic zoom is used in magnification program line A fEZmax; The longest focal length (105 m) of photographic lens system 20 in which electronic zoom is used in magnification program line A
m) Subsequently, data for zoom-up driving is sent to the intra-lens circuit LECT in the interchangeable lens LE, and after the flag ZF is set to 1, the process returns to #1095. on the other hand,
If feq≦fEZmin (=70mm) (#11
60 (YES), only optical zoom is performed, so #1
The process jumps to #195 to #1205, zoom drive data for zoom-up drive is sent to the in-lens circuit LECT, flag ZF is set to 1, and then the process returns to #1095.

[0181] If the magnification program line is B type (NO in #1155), the pseudo focal length feq is fE
It is determined whether or not it is less than Zmin (=70mm),
If feq≦fEZmin (=70mm) (#11
80 (YES), the magnification Mf is 0.
The relay lens 27 is driven so as to increase by 1 (#1185, #1190), and after the flag ZF is set to 1, the process returns to #1095. On the other hand, feq>fEZm
If it is in (=70mm) (YES in #1160),
Since only optical zoom is performed, #1195 to #120
5, data for zoom-up driving is sent to the lens internal circuit LECT, flag ZF is set to 1, and then the process returns to #1095.

Note that even when the shooting mode is the normal shooting mode, the loop of #1140, #1150 to #1205 is executed every time a zoom-up operation of optical zoom or electronic zoom is performed, and the magnification Mf of the relay system lens 27 is is corrected and the corrected data is sent to the in-lens circuit LECT.

[0183] If a zoom down operation of optical zoom or electronic zoom is performed (Y in #1110 or #1120)
ES), the process moves to #1210 (see FIG. 39), and a zoom-down operation is performed in the same procedure as the zoom-up operation described above. This zoom drive requires that the zoom direction of the photographing lens system 20 and the relay system lens 27 be on the wide side;
The zoom drive data sent to the lens internal circuit LECT of 265 is zoom down data, and the magnification program line B type feq≦fEZmin (=70
The relay system lens 27 at the magnification (#1
255, #1260), so the explanation will be omitted.

Returning to FIG. 29, when the zoom drive process is completed, the on-body display section DISP1 and the infinder display section DISP2 display, for example, exposure control values AVC, TV.
Data such as C and pseudo focal length feq are displayed (#2
55). For example, the pseudo focal length feq is determined by the infinder display section DISP2 (field frame display member 2) as shown in FIG.
9) is displayed below.

[0185] Next, it is determined whether the release switch S2 is on or not (#260), and if it is on,
It is determined based on the flag AFEF whether the focusing operation has been completed (#265). If the flag AFEF is set to 1, it indicates an in-focus state, and if it is reset to 0, it indicates an out-of-focus state.

[0186] In #265, when the in-focus state is confirmed (A
FEF=1), all signal interruptions are prohibited, and the "exposure control" subroutine is executed to perform the shooting operation (
#270, #275).

FIG. 41 shows the "exposure control" subroutine. When the "exposure control" subroutine is called, the release magnet is turned on, and the aperture 51 starts to be stopped down and the main mirror 21 is retracted (#1280). Also, the holding magnets of the front curtain 52 and the rear curtain 53 are turned on (#1
281), and then the timer T starts counting the running timing t1 of the front curtain 52 (#1282). In the case of trimming photography or panoramic photography, the travel timing t1 is shorter by a predetermined time Δt1 corresponding to the trimming magnification Mf than the travel timing t1 during normal photography.

Subsequently, when the timer T finishes counting (#1283), the holding magnet of the front curtain 52 is turned off, the front curtain 52 starts running (#1284), and the exposure time tV is set by the timer CT. Counting is done (
#1285). When the counting ends, the holding magnet of the trailing curtain 53 is turned off, the trailing curtain 53 starts running (#1286), and at the same time, the timer MT starts counting the return timing t2 (#1287). In the case of trimming photography or panoramic photography, the return timing t2 is a predetermined time Δt2 (≒2Δt) according to the trimming magnification Mf from the running timing t1 during normal photography.
1) The time will be shorter.

[0189] Subsequently, when the timer MT finishes counting (#1288), the charge motor is turned on and the leading curtain 52 and trailing curtain 53 are charged up (#1289).
), the aperture 51, main mirror 21, etc. are reset (
#1290), return.

Returning to FIG. 30, when the photographing operation is completed, the data of the trimming magnification Mf and the data of the panoramic mode (if set) are written on the film 54, and then the film 54 is wound one frame (# 280
, #285). Subsequently, the flag S1ONF is reset to 0, and the signal interrupt (S1INT) from switch S1
is permitted, and the process returns to #45 of the main flow (FIG. 24).

[0191] If it is confirmed in #260 that the release switch S2 is off, or that it is out of focus in #265 (AF
EF=0), it is determined whether the input terminal IP10 of the microcomputer μC1 is at a low level (#300), and if it is at a low level, the power supply holding timer T2 is reset and the main flow (Figure 24) is started. Return to #45 (#3
05). If the input terminal IP10 is at a high level, it is determined whether or not zooming is in progress based on the operation data of the up/down switches SZU and SZD (#310). If zooming is in progress, the power holding timer T2 is started and the power is turned off. The holding time is extended and the process returns to #45 of the main flow (FIG. 24) (#305).

If zooming is not in progress in #310, it is determined whether or not the power supply holding timer T2 has counted 5 seconds (#315), and if 5 seconds have not elapsed, the main flow (FIG. 24) ), and if 5 seconds have elapsed, move to #290 and #295 above, and switch S
1 is turned off, the end of photographing is controlled.

Next, the control operation of the microcomputer μC2 in the interchangeable lens LE or LE' will be explained. Interchangeable lens L
When E or LE' is not attached to the camera body BD, the lens attachment detection switch SLE is in the on state.
Since the reset terminal RE2 of the microcomputer μC2 is held at a low level, the microcomputer μC2 and other circuits in the lens are in a stopped state. When the interchangeable lens LE or LE' is attached to the camera body BD, the lens attachment detection switch SLE is turned off, and the reset terminal R is turned off.
In response to the change of E2 from low level to high level, microcomputer μC2 is activated.

When the microcomputer μC2 starts up, the contents of the input/output ports and internal registers are first reset to the initial state, and when a chip select signal is input from the microcomputer μC1 in the camera body BD to the chip select terminal CSLE, the “CS The chip select signal interrupt processing is performed by the "interrupt" routine.

FIG. 42 shows the "CS interrupt" routine. When the chip select signal is input, the encoder DVE
Information regarding the distance DV, focal length f, and power zoom operation (speed, direction, etc.) is read from N, ZMEN, and ZVEN (#1300 to #1310). Next, the communication mode data SI0 input from the microcomputer μC1 is read, and the communication mode is determined from the data (#
1315, #1320).

If the communication mode is lens communication I mode, the above-mentioned 11 lens data such as focal length f, aperture F value, etc. (6 in the case of manual zoom) are stored in the microcontroller μC.
1 (#1325), and when the communication is completed (
If YES in #1330), the "PZ" subroutine is executed to perform the zoom operation of the photographing lens system 20.

Furthermore, if the communication mode is lens communication II mode (NO in #1320), zoom drive data such as control focal length fC, presence or absence of panorama mode, and information regarding zoom drive sent from microcomputer μC1 is read. (#1335), when the communication is completed (#134
0 (YES), the "PZ" subroutine is executed and the zoom operation of the photographic lens system 20 is performed (#1345).
.

FIG. 43 shows the "PZ" subroutine. When the "PZ" subroutine is called, the current focal length f is first read (#1400), and the microcomputer μ
Based on the zoom drive data input from C1, it is determined whether the mode is panorama mode (#1405). In the panoramic mode, it is determined whether the focal length f is the shortest focal length FEZmin (=70 mm) that allows electronic zooming (#1410), and if f>FEZmin (=70 m
m), then this shortest focal length FEZmin (=70
mm) is set as the control focal length fC, and the focal length f of the photographic lens system 20 is changed and set to the control focal length fC (#1
415, #1430).

[0199] On the other hand, is it not in panorama mode? (#140
5 (NO), or f≦fEZmin in panorama mode
(=70 mm) (YES in #1410), it is determined whether the zoom control is based on the control focal length fC from the microcomputer μC1 (#1420), and if the zoom control is from the microcomputer μC1, the photographing lens system 20 focal length f
is changed and set to the control focal length fC (#1425, #
1430), return.

If the zoom control is not from the microcomputer μC1, the zoom lens group of the photographing lens system 20 is drive-controlled based on data such as zoom stop and zoom up/down in the zoom drive data, and the focal length is changed to a predetermined focal length f. (#1435 to #1455).

[0201]

As explained above, according to the present invention, a detachable photographing lens consisting of a zoom lens whose focal length is set by operating an operating member on the lens side is attached to a camera body having an electronic zoom function. In the cropping camera configured as above, a predetermined cropping magnification is set in conjunction with the optical zoom operation of the photographing lens, so that the zoom range by the optical zoom operation is substantially expanded to a pseudo photographing magnification range. be able to. Furthermore, it is possible to zoom to a pseudo photographing magnification range simply by operating the optical zoom, and zoom photographing can be easily performed.

Furthermore, since the trimming magnification Mf is calculated from the focal length information (f, fmax, fmin) of the photographing lens using the following formula, it is possible to set a pseudo photographing magnification by operating the optical zoom of the photographing lens. It can be set continuously over the maximum variable range. Mf=(f-fmin)・(Mfmax-Mf
min)/(fmax-fmin)+Mfmin

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram within a camera body of a trimming camera according to the present invention.

FIG. 2 is a circuit configuration diagram inside an interchangeable lens that includes a built-in drive motor.

FIG. 3 is a circuit configuration diagram inside an interchangeable lens that does not include a built-in drive motor.

FIG. 4 is a front external view of the camera body of the trimming camera according to the present invention.

FIG. 5 is a rear external view of the camera body of the trimming camera according to the present invention.

FIG. 6 is a configuration diagram of an optical system of a trimming camera according to the present invention.

FIG. 7 is an external view of an interchangeable lens with a built-in drive motor.

FIG. 8 is an external view of an interchangeable lens without a built-in drive motor.

FIG. 9 is a diagram showing a lens configuration of a photographing lens system.

FIG. 10 is a diagram showing the characteristics of an interchangeable lens at a focal length of 32 mm.

FIG. 11 is a diagram showing the characteristics of an interchangeable lens at a focal length of 36.6 mm.

FIG. 12 is a diagram showing the characteristics of an interchangeable lens at a focal length of 68.6 mm.

FIG. 13 is a diagram showing the characteristics of an interchangeable lens at a focal length of 87.5 mm.

FIG. 14 is a diagram showing the characteristics of an interchangeable lens at a focal length of 102 mm.

FIG. 15 is a diagram showing the lens arrangement and the height of the photographic screen when the focal length of the interchangeable lens is 32 mm.

FIG. 16 is a diagram showing the lens arrangement and the height of the photographic screen when the focal length of the interchangeable lens is 36.6 mm.

FIG. 17 is a diagram showing the lens arrangement and the height of the photographic screen when the focal length of the interchangeable lens is 68.6 mm.

FIG. 18 is a diagram showing the lens arrangement and the height of the photographic screen when the focal length of the interchangeable lens is 87.5 mm.

FIG. 19 is a diagram showing the lens arrangement and the height of the photographic screen when the focal length of the interchangeable lens is 102 mm.

FIG. 20 is a diagram showing a magnification program line that combines the photographing magnification of optical zoom and the trimming magnification of electronic zoom.

FIG. 21 is a side view of essential parts showing an exposure control mechanism using a focal plane shutter.

FIG. 22 is a diagram showing exposed areas of a film.

FIG. 23 is a diagram for explaining the exposure control operation of the focal plane shutter.

FIG. 24 is a main flowchart for explaining the photographing operation of the trimming camera according to the present invention.

FIG. 25 is a flowchart of the subroutine “focal length initialize”.

FIG. 26 is a flowchart of the subroutine “lens communication I”.

FIG. 27 is a flowchart of the subroutine “lens communication II”.

FIG. 28 is a flowchart of the subroutine "relay lens control."

FIG. 29 is a flowchart of the subroutine “S1 ON”.

FIG. 30 is a flowchart of the subroutine “S1 ON”.

FIG. 31 is a flowchart of the subroutine “zoom ratio change”.

FIG. 32 is a flowchart of subroutine “AF”.

FIG. 33 is a flowchart of the subroutine “key input”.

FIG. 34 is a flowchart of the subroutine “key input”.

FIG. 35 is a flowchart of the subroutine “exposure calculation”.

FIG. 36 is a flowchart of the subroutine “zoom control”.

FIG. 37 is a flowchart of the subroutine “zoom control”.

FIG. 38 is a flowchart of the subroutine “zoom control”.

FIG. 39 is a flowchart of the subroutine “zoom control”.

FIG. 40 is a diagram showing an example of pseudo focal lengths displayed in the finder.

FIG. 41 is a flowchart of the subroutine “exposure control”.

FIG. 42 is a flowchart for explaining the operation of CS interrupt processing in an interchangeable lens.

FIG. 43 is a flowchart of subroutine “PZ”.

[Explanation of symbols]

1 Slider 2 Release button 3, 10 Up/down switch 4 Display section 6, 42 AF coupler 7, 43 Aperture lever 8 AE mode change button 9 Panorama mode setting button 11 Flash 12 Finder window 20 Photographic lens system 21 Main mirror 22 AF mirror 23 AF module 24 Focal plate 25, 26, 30 Mirror 27 Relay lens 28 Condenser lens 29 Field frame display member 31 Eyepiece 32 Photometric lens 33 Photodetector 40, 40' Zoom operation ring 50 Movable light shielding plate 51 Aperture 52 Front curtain 53 Rear curtain 54 Film μC1, μC2 Microcomputer AFCT
Focus detection light receiving circuit LM Photometry circuit DX Film sensitivity reading circuit DISPC Display control circuit DISP1, DISP2 Display section LECT, LECT' In-lens circuit EZEN, DV
EN, ZVEN, ZMEN Encoder M Memory M1 to M4 Motor MD1, MD2, MD3, MD4 Motor drive circuit T
VCT Shutter control circuit AVCT Aperture control circuit FL Flash circuit FLC Flash control circuit DD DC/DC converter WRT Data write circuit SMOD, S1, S2, SM, SPA, SLE, SMU
, SMD, SZU, SZD Switch T, CT, MT Timer E1 Battery

Claims (2)

[Claims] 1. A trimming camera comprising a camera body with a settable trimming magnification and a detachable photographic lens consisting of a zoom lens, wherein the photographic lens has a focal length output that outputs information on a set focal length. and an output means for outputting the output focal length information to the camera body, and the camera body includes a calculation means for calculating a trimming magnification based on a preset relationship from the focal length information. A trimming camera characterized by: 2. The trimming camera according to claim 1, wherein the trimming magnification is calculated from the focal length information using the following equation. Mf=(f-fmin)・(Mfmax-Mfmin)
/(fmax-fmin)+Mfmin where, Mf; trimming magnification Mfmax; maximum value Mfmi of trimming magnification variable range
n; Minimum value f of the variable range of trimming magnification; Set focal length fmax of the photographic lens; Maximum value fm of the variable range of focal length of the photographic lens
in; Minimum value of the focal length variable range of the photographing lens