JPS62163033A - Camera capable of trimming photographing - Google Patents

Abstract

PURPOSE:To improve the operability of a camera by automatically releasing a trimming mode when it is apparently necessary to restore the trimming mode to a normal photographing mode, e.g. when a back cover is opened/closed to replace a film. CONSTITUTION:When it is apparently necessary to restore the current mode to the normal photographing mode, e.g. when a main switch 2 is turned off, a lens lock button 12 is turned off to load/unload a lens, or the back cover is opened/closed to replace a film, the trimming mode is automatically reset and restored to the normal photographing mode. Namely, when the main switch 2 is turned from on to off, a terminal INT 2 is turned from 'L' to 'H' and an interruption is generated. When the interruption is generated, all interruption is inhibited to prevent a routine from being interrupted on the way by other interruptions, respective output ports Ox are reset and the trimming mode is reset to obtain the normal photographing mode.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a camera that enables cropping photography.

[Prior art and its problems 1] In addition to the normal shooting mode in which the entire shooting screen area is printed, so-called trimming shooting mode allows information for specifying printing of a narrow area within the i-color screen to be recorded on the film. The camera that made this possible was published in 1973-
26721 and Japanese Utility Model Application No. 60145728, it is possible to obtain the effect of photographing with a telephoto lens by enlarging the part designated at the time of printing to a predetermined size. There is.

With a camera that enables this kind of trimming, switch the trimming mode Y to switch from average metering to spot metering. However, if you forget to cancel the trimming mode and take a picture as is, the picture will be clearly different from the picture obtained in the normal photography mode.

Therefore, with cameras equipped with a cropping mode, you must manually cancel the cropping mode after shooting in the cropping mode, and you must always check to see if the cropping mode has been cancelled. There was the annoyance of not being able to do it.

[Purpose of the Invention] This invention has been made to eliminate the above-mentioned problems, and even if the trimming mode is set, the problem occurs when changing the lens or opening and closing the back 4R to change the film. It is an object of the present invention to provide a camera capable of trimming photography, in which the set trimming mode is automatically canceled when it is clearly necessary to return to the normal photography mode.

1 Configuration of the Invention 1 A camera capable of cropping photography according to the present invention includes a photography mode selection means for selecting between a normal photography mode and a trimming photography mode that specifies an area narrower than the range to be printed in the normal photography mode. In the trimming shooting mode, a trimming control means performs various controls according to the trimming size, a state signal output means outputs the state of the camera as a signal, and a signal from the state signal output means is used to cancel the trimming control means. The invention is characterized by comprising a release means for.

[Embodiment 1] Hereinafter, one embodiment of a camera capable of cropping photography according to the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show the appearance of the single-lens reflex camera body of this embodiment. 1 is a button to switch the trimming size, and each time you press button 1, the size changes in the following order: → No trimming Half size (1/2) Landscape Quarter size (1/4) Landscape Half size Portrait Quarter size Portrait → It has become. 2 is a main switch of the camera, and when this main switch 2 is off, all operations as described below are prohibited. Reference numeral 3 denotes a shutter release button, and photometry is started when the button 3 is pressed in the first step, and a release operation is performed in the second step. 4 is a preview button, and while button 4 is pressed, the aperture will be stopped down to the actual shooting aperture value, so that you can know the depth of field at one stop during actual shooting. It has become. 5 is Faing.

6 is an up/down switch for changing the shutter speed (Tv).As shown in Figure 2, each time you push this switch to the right, the shutter speed changes by one step to the high speed side. ni) 1111-) 7+
Verse 4-le 101. t-; “January Fune I+1 the-i Ii,;
t1 te Tsukuda 1 kyo - changes step by step. 7 is an accessory shoe for attaching a flash device to the camera body, and 8 is a connector for exchanging information between the flash device and the camera body when the flash device is attached to the accessory shoe 7.

9 is a switch for changing the photometry mode Y)
, switches between average metering, which measures the entire photographic screen, and spot metering, which measures only a predetermined narrow area. 10 is an up/down switch for changing the aperture value (Aν), and each time this switch 10 is pushed upward in FIG. 2, the aperture is opened one step at a time. Each time you do this, the aperture is narrowed down one step at a time.

11 is the shooting mode changeover switch, and the second switch I
- Every press of N - 2, → P (program) mode A (aperture priority) mode M (manual) mode S (shunter speed priority) mode → No) Haki 1 = 3 mode VM 7: TI 11 Hayashi b7. -191
1) is a lens lock button for fixing the lens to the camera body, and 13 is a signal transmission pin for transmitting information from the lens to the camera body. 14 is an aperture return lever, and when the lever 14 is operated, the camera controls the aperture of the lens. L and Dl are liquid crystal displays (LCD) for displaying photographing information.

FIG. 3 shows a side sectional view of the camera in FIGS. 1 and 2. FIG.

Reference numeral 15 denotes a semi-transparent mirror that can rotate about one end thereof as a fulcrum. 16 is a reflection plate for guiding the subject light transmitted through the mirror 15 to the light receiving element PD, and 17 is a semi-transparent mirror 1.
5 is a pentaprism for guiding the reflected light from 5 to the finder 5, and '18 is an eyepiece lens provided behind the pentaprism 17. LD2 is a focus plate made of an LCD provided in the optical path of the reflected light from the semi-transmissive mirror 15. For example, one of the two pieces of glass composing the LCD can be made into a cloak surface to serve as a focus plate, and the finder can also be used as a focus plate. You can also display shooting information within the camera at the same time.

19 is the back cover of the camera body, and the inner surface of this back cover 19 is shown in FIG. LEDl and LED2 are light-emitting diodes that are used to imprint code-V trimming information and equivalent focal length, which will be described later, on the side of the film screen.If the code is recorded, it is converted to a numerical value and recorded on the print when printing. . 20 is the LED from the camera body.
1. This is a connector for transmitting information to the LED 2.

FIG. 5 is a detailed view of the focusing plate LD2, and shows a.

ble, d, and e indicate the display contents by LCD segments provided corresponding to the four corners of the image frame on the print obtained by cropping photography. lights up. For example, when setting half-size landscape trimming, only segment a lights up (pond segment).
b, c, and d are turned off, and only segment e is turned on after trimming the 1/4 size vertically. e shows the shooting information displayed at the bottom of the focusing plate LD2, starting from the left end, the aperture is F5.6, the shutter speed is 250 seconds, and P mode, and I shows the completion of charging in flash mode. .

FIGS. 6(a), (b), and (c) show the photographing information display section e.
This shows that A mode, M mode, and S mode have been selected, respectively.

FIG. 7 shows a detailed diagram of the LDI.

[ is a segment for displaying the shooting mode, 2 is a segment for displaying film sensitivity, 11 is a segment for displaying shutter speed, 1 is a segment for displaying trimming shooting, and during trimming shooting, the letters TRIMMING are lit, Nothing lights up during normal shooting. j is a segment for displaying the aperture, and k is a segment for displaying the number of apertures, which are displayed only during trimming photography. How many of these is the equivalent focus aI! A means that by using a telephoto lens, etc. without cropping, it is possible to obtain the same depth of field in the same image frame as the print obtained by cropping, and what happens to the telephoto lens, etc. at this time? It was named after school. By knowing this equivalent focal length and equivalent focal length, it becomes possible to easily recognize the telephoto effect and depth in prints obtained by cropping photography.

ρ is a segment for displaying the focal length of the photographing lens, and m is a segment for displaying the equivalent focal length during cropping photography.

n is a segment for displaying the trimming mode; half is displayed for half size, quarter is displayed for quarter size, and one of Roro is displayed for horizontal or vertical orientation. Is displayed.

Figure tPJ8 shows an example of LDI display, in A mode, film sensitivity is 15O400, no trimming shooting,
The shutter speed is 17250 seconds and the aperture value is F5.
6. The focal length of the lens used is 1” 135+am
It shows that.

Also, in Figure 9, in M mode, the film sensitivity is IS○2.
00, in the case of cropping shooting, the shutter speed is 1/125 seconds, the aperture value is F2.8, and is? +, +
+-t'n) i f+-te glance nail kltJ, /r=Ql:,
, , 1% k11' Wa, etc. The calibration value is F4, the equivalent focal length is f=sOmm, and the trimming size is a vertically long half size. Therefore, if the print obtained by this cropping shooting is enlarged to the size of the predetermined image frame in normal shooting, the aperture value will be the depth of field of F4, and the focal length will be f=50m.
This corresponds to when a lens of m is used.

FIG. 10 shows one of the control circuits applied to the camera of the present invention.
An example is shown.

Reference numeral 100 denotes a microcomputer consisting of a CPU (central processing circuit), in which signals from each switch as described below are input to the input capo (Ix), and control signals are sent from the output capo (Ox) to each device. be done. Sl is a switch that is turned on when the shutter release button 3 is pressed in the first step, and S2 is a switch that is turned on when the shooting mode switching button 11 is pressed. S3 is a switch that is linked to the trimming switch button 1, and S4 is a switch that is linked to the lens lock button 12 and is turned on when the lens is attached or removed. S5 is a switch that is linked to the back cover 19 and is turned on when the back cover 19 is opened, and S6 is a switch that is turned on when the shutter release button 3 is pressed in the second step.

S7 is a switch that is turned on in conjunction with the preview button 4, and S8 is a switch that is turned on in conjunction with the photometry mode changeover switch 9. S9 is a switch that is turned on by the release operation of the shutter release button 3 and turned off when the film winding is completed. 5IO-1,510-
2 is a switch linked to the shutter speed up/down switch 6; when the shutter speed is set to the high speed side, the switch 5IO-1 is turned on; conversely, when the shutter speed is set to the low speed side, the switch S10-2 is turned on. .

Sl 1-1. Sl 1-2 is a switch that is linked to the aperture up/down switch 10, and when the aperture is set to the open side, the switch 5it-i is turned on, and conversely, when the aperture is set to the narrowed side, the switch 511-2 is turned on. Become.

S12 is a switch linked to the main switch 2.

One terminal of each of the switches 81 to S12 is grounded, and the other terminal is connected to the microcomputer 10.
0 input ports I, ~I14. These input ports 11 to I+4 are each pulled up to "H" by a resistor R connected to a positive voltage at one end, and by closing each switch 81 to S12, each input port 11 to ■1 is It becomes “L”.

In addition, each of the input ports 11 to 1 is directly connected to the input port 102 of the AND circuit 102 via the differential circuit 101, and the output port of the AND circuit 102 is connected to the input port 102 of the microcomputer 100. interrupt terminal l
Connected to NTl. The input ports I, . . . are connected to the interrupt terminal INT2 of the microcomputer 100. The input signal to the second interrupt terminal lNTl is “H”
When the microcomputer 10 changes from
Interrupts are set to 0. Therefore, the differentiating circuit 10 when the switch S5 is on or off
The AND circuit 102 is turned on by the output signal from 1, and an interrupt is generated by the interrupt terminal lNTl. In addition, the interrupt terminal INT2 has an input signal that changes from “L” to “H”.
”, an interrupt will be generated.

FC is a flash control unit connected to the flash device via the flash connector 8, and displays equivalent focal length, trimming mode, interlocking distance display, etc. for switching light distribution characteristics via the output port o'c. Information such as the shooting aperture value and film sensitivity of the control unit is input, and a charging completion signal is input from the flash control unit FC to the input port L and the photometry unit LM.The photometry unit LM detects the subject. This is to measure the brightness By, and a signal indicating whether it is average photometry or spot photometry and a photometry permission signal are input from the output boats 01 and 02, and the photometered data is input to the input capo INm. In addition, from this photometer LM, the flash system ρI+, 2
? , 上と佑, Lλ, 上ふ夛, 上发吻top signals are sent. Thereby, photometry is started at the same time as the flash is emitted, and when the amount of photometry reaches a predetermined amount, a stop signal is sent to stop the flash device from emitting light.

AC is an aperture control section, and a stepping motor SM for opening and closing the aperture mechanism is driven in accordance with a signal from an output capacitor (Oac). When the aperture operation by the stepping motor SM stops, the aperture control unit AC inputs the input port 1 to
1. An aperture stop signal is sent. SC is the mirror/shutter control unit, and the output boat 03 Io 41OS
A release signal and signals 1c and 2c for controlling the front and rear curtains of the shutter are respectively inputted from the mirror/shutter control unit SC, and the mirror 15 is input to the input ports I and 7 at the top. Mirror up completion signal to notify that it has rotated and flash control unit FC
A flash light emission signal for activating the flash device is sent to the flash device.

DS is output capo) (indicator LD according to the signal from Ms
It is a display control unit that displays data on I and LD2, and B
Z is a buzzer and a control unit for this buzzer that warns of camera shake according to a signal from the output boat o6. The PC outputs information from the Opc to the light emitting diodes LEDI and LE.
This is an imprint control unit for recording on the film by D2, and is operated by an imprint signal from the output port 07. DX is input by reading the code indicating the film speed shown on the film cartridge.)Id
LN is a lens, and from this lens LN the focal length, open aperture value, minimum aperture value, etc. are sent to the input lens (Hen).

Next, the operation of the control circuit will be explained according to chart 70.

The 70-chart in FIG. 11 shows an interrupt routine using the interrupt terminal lNT1.

As described above, when an interrupt is applied to the interrupt terminal lNTl due to any of the switches 81 to S4 being turned on, or due to the switch S5 being turned on or off, the interrupt is processed in step #1. Transmission terminal lNTl
Interrupts are prohibited. This is because trouble will occur if an interrupt occurs again in the subsequent processing process.

Next, in step #2, it is determined whether the switch S12, i.e., the main switch 2, is on, and if it is off, the process proceeds to step #12, where the interrupt prohibition of the interrupt terminal lNTl is canceled, and step #13 At this point, unnecessary locks within the microcomputer 100 are stopped and a standby state is entered in which power consumption is minimized. On the other hand, if main switch 2 is on, switch S is turned on in step #3.
1 is on, i.e. shutter release button 3
It is determined whether or not the button is pressed in at the first stage, and if it is pressed in, the process proceeds to a photometry routine to be described later, and if it is not pressed in, the process proceeds to step #4. In step #4, it is determined whether the switch S2 is pressed, that is, whether the mode switching button 11 is pressed. If it is pressed, the process proceeds to step #16, and after the photographing mode is changed, the process proceeds to step #10.

On the other hand, if the mode pull Q#i@11 is not 111, the process proceeds to step #5, where it is determined whether the state of the switch S4, that is, whether the lens lock button 12 has been pressed to attach or detach the lens. If the lens lock button 12 is pressed, the process proceeds to step #15, the set trimming mode is reset, and the process proceeds to step #10. On the other hand, if the lens lock button 12 is not pressed, the process proceeds to step #6, and it is determined whether the switch S5 and the Asahi back cover 19 have been opened.

If the back cover 19 is opened due to film replacement, the process proceeds to step #15, the trimming mode is reset, and the process proceeds to step #10. However, if the back cover 19 is not opened or closed and is closed, the process proceeds to step #15. Go forward 71 steps. In step #71, the state of the switch S3, that is, the trimming switching button 1 is determined, and if this button 1 is pressed, the process proceeds to step #14, and as described, trimming is performed every time this button 1 is pressed. The size can be changed sequentially, and the process then proceeds to step #10.

On the other hand, if trimming switch button 1 is not pressed, the process proceeds to step #8, where the film sensitivity is read by the code reading section DX, and in the next step #9, the film sensitivity setting is adjusted based on the read film sensitivity. Changes are made. In step #10, the above settings are displayed on the display LD1. After that, in step #11,
The outputs of each output capacitor ()Ox of the microcomputer 100 are reset, and in step #12, the interrupt inhibition of the interrupt terminal lNTl is canceled, and the process proceeds to step #13, where the microcomputer 100 enters a standby state.

FIG. 12 is a routine showing an interrupt I) to the interrupt terminal INT2.

When main switch 2 turns from on to off, terminal I
NT2 changes from 'L' to 'H' and an interrupt occurs.

When this interrupt occurs, all interrupts are prohibited in step #57 to prevent this routine from being interrupted midway by other interrupts. Step #5
At step 8, each output boat XX is reset, and at step 59, the trimming mode is reset to the normal photographing mode.

In this way, when main switch 2 is turned off,
As mentioned above, when the lens lock button 12 is turned on to attach or detach the lens, or when the back cover is opened or closed to change the film, it is obviously necessary to return to the normal wl shadow mode. When the trimming mode is automatically reset, the camera returns to the normal shooting mode. This prevents failures in shooting due to forgetting to cancel the trimming mode.

At step #60, data for standby display is sent to the display control section DS, and at step #61, the standby display is displayed on the display LDI.

Then, in step #62, the interrupt terminal lNTl is set.

Interruption to INT2 is permitted, and the standby state is entered in step #63. Note that when the main switch 2 is off, the camera does not operate as described above.

FIG. 13 shows a flowchart of the photometry routine, and when the chanter release button 3 is pushed to the first stage in step #3 described above, the process proceeds to this photometry routine.

At step #17, photometry is started by sending a photometry permission signal from the output boat 02 to the photometry section LM. At step #18, press the trimming size switching button 1.
It is determined whether the trimming mode is set, and if the trimming mode is set, step #2
1, bot photometry is again set for the microcomputer 100, and the process proceeds to step #22.

In this manner, during cropping photography, regardless of the setting status of the photometry mode changeover switch 9, the photometry is forcibly switched to spot photometry, so that the photometry is not performed on areas outside the trimming frame. On the other hand, if the trimming mode is not set, the mode set by the photometry mode changeover switch 9 is determined in step #19, and if it is set to the spot photometry side, spot photometry is set in step #21; , if it is set to the average photometry side, average photometry is set in the microcomputer 100 in step #20. In the next step #22, lens information such as the focal length, maximum aperture, and minimum aperture is taken in from the lens LN.

In step 23, an equivalent focal length is calculated based on the focal length of the lens and the trimming size using an equivalent focal length calculation routine to be described later. In the next step #24, switch 5IO-1, 2, switch 5ll-1, 2,
That is, the shutter speed (
Tv) and aperture 1) (Av) are taken in. Step #
At step 25, information on the photographing mode, trimming mode, mounting state of the lens LN, and opening/closing state of the back cover 19 is taken in, as described above, depending on the states of the switches 82 to S5.

In step #26, when the photometry value by the photometer LM is input to the human capo INm, in step #27,
Based on the photometric values, an exposure calculation routine to be described later calculates the shutter speed Tv, aperture value Av, and other calibration values. These calculation results and the equivalent focal length are displayed on the display LDI in step #28.

In this way, by displaying the equivalent focal length and the focal length value on the display LDI, it is possible to easily know the depth of field and telephoto effect when cropping photography is performed.

In the next step #29, 7 lash information such as the equivalent focal length is sent from the output boat ofC to the 7 lash control unit FC in order to change the light distribution characteristics. This allows the lens on the front of the light emitting unit to be moved by a motor etc.
The beam angle can be changed. In step #30, the state of the switch S7, that is, the preview button 4, is determined. If this button 4 is pressed, the preview aperture value calculated from the photometric value in the calculation routine is displayed in step #31. The aperture control unit AC operates the stepping motor and the lens LN is narrowed down to a predetermined aperture value. On the other hand, if the preview button 4 is not pressed, in step #32, the aperture control section A
The open aperture value of the lens is sent to C, the aperture of the lens LN is kept open, and the process proceeds to step #33. At step #33, the state of the photometry switch S1, which is turned on in the first step of the shutter release button 3, is determined. If this switch S1 is turned on, the process advances to step #35, and the power hold timer is activated. It is reset and proceeds to the next step #38.

Therefore, when the photometry switch S1 is on, the power is maintained by resetting the Hall V timer. If the switch S1 is off, step #
At 34, the power hold timer determines whether a predetermined time has elapsed (overflow), and the
- If so, the output port ○X is reset in step #36, and after allowing an interrupt to the interrupt terminal NTl in step #37, the process advances to step I56 and enters a standby state. On the other hand, over 70-
If not, proceed to step #38 and turn switch S.
9 is on or off, that is, whether there is a release operation of the shutter release button 3 or whether film winding is completed, and if the film winding is not completed, the shutter release button 3 is operated so as not to release the film. Regardless, the process returns to step #18 and repeats the above process.

On the other hand, if the winding of the film has been completed, the process proceeds to step #39, where it is determined whether the switch S6, that is, the shutter release button 3, has been pushed to the second stage.If it has not been pushed in, the process returns to step #18, as described above. The process is repeated, but if the shutter release button 3 has been pressed to the second stage, the process proceeds to the next step #40. In step #40, photometry by the photometer LM is prohibited, and signals for the camera shake buzzer BZ and the like are reset to prepare for release. In step #41, the imprint information to be recorded on the film, that is, the trimming mode signal and the equivalent focal length, is sent to the imprint control unit PC, and step #4
2, the aperture of the lens LN is narrowed down by sending the fZ shadow aperture value to the aperture control unit AC.

In the next step #43, a release signal is sent from the output boat O1 to the mirror/shutter control unit SC, and the mirror 15 is rotated upward. Then, in step #44, an imprint signal is sent from the output boat 07 to the imprint control unit PC, and the imprint information is recorded on the film.

It is determined by the steering knobs #4S and #46 whether the narrowing down operation and the raising of the mirror 15 are completed, and when each operation is completed, the process proceeds to the next step #47. Switch the metering mode to average metering for flash dimming using Stereo knob #47. Then, at the step well 48, the signal IC is transmitted from the output boat o to the mirror/shutter control unit S.
When the first shutter curtain starts and exposure starts, the timer in the microcomputer 100 operates in the step well 49 to count the shutter speed time, and when the counting is completed, the step - At knob #50, a signal 2C is sent from the output boat O6 to the control unit SC, thereby starting the shutter trailing curtain and stopping the exposure.

Further, when the shutter front curtain is fully opened, a flash light emission signal is sent from the mirror/shutter control section SC to the flash control section FC, and the flash device emits light. The flash light reflected by the subject is transmitted to the photometer L.
It is integrated by M, and if this integral value becomes a predetermined value,
A stop signal is sent from the photometry section LM to the flash control section FC, and the flash stops emitting light. In step #51, the process waits for a time until the shutter rear curtain has completely run out, and then the process proceeds to step #52. In step #52, information for displaying the standby state by turning off the shutter speed and aperture value displayed on the display LDI is created, and this information is transferred to the display in step #53. Displayed on LD1. after that,
In step #54, the output capacitor OX is reset, and in step #55, an interrupt to the interrupt terminal lNTl is permitted, and then the process proceeds to step #56 to enter a standby state.

Next, the method for calculating the equivalent focal length is shown in FIG. 17(a).

This will be explained using (b).

In Fig. 17 (,), the photographing lens, [ indicates its focal length, and T indicates the height of the image projected onto the film Y in the normal photographing mode, so that the image height is αT. Consider the case of trimming to .

There is a relationship of Lanω=T/r, tanω'=αT/f, and FIG. 17(b) shows αT obtained by trimming.
It shows the relationship when the image height of is extended to T, where x is the equivalent focal length.

In this case, from tanω' = T/x, x=T/
lanω'=T/(αT/f)=f/α...■.

As a result, for example, when the focal length f is 35 mm and the image height is trimmed to 172, in this case, α
= 1/2, and the equivalent focal length is 35/(1/2) = 7
0 mm, and the trimming size is 1/4. Furthermore, if the trimming is half size, the value of α will be 1/fi.

Therefore, as shown in the equivalent focal length calculation routine in FIG. 14, in the case of half-size trimming, step #
In step #23-2, the value obtained by multiplying the focal length of the lens by 7 becomes the equivalent focal length, and if the size is 1/4, the value obtained by multiplying the focal length of the lens by 2 in step #23-4 becomes the equivalent focal length. Become.

FIG. 15 shows the exposure calculation routine described above.

At step #64, an exposure value Ev is calculated from the brightness value By of the subject inputted from the photometry section LM and the film sensitivity Sv inputted from the hood reading section DX. (Ev=
Bv+Sv) Then, in step #65, the status of preview type 4 is determined. Exposure calculation is complicated during preview operation, so it is not performed in this routine, but is performed in step #95 in case the aperture value or preview aperture value is changed due to a change in trimming mode during shooting. Perform only the preview aperture calculation several times.On the other hand, if the preview operation is not performed, step #66
In step #67 and step 68, the photographing mode is determined.

If it is M (manual) mode, the process proceeds to step #69, where the manually set aperture value (Av) is read, and then, at step #7o, the shutter speed Tv, which was also manually set, is read. If it is determined in the step well 71 that it is flash photography and charging is completed, the shutter speed TV is held down in the step well 72 so that the shutter speed Tv is synchronized with the light emission of 7 lashes. After that, the process advances to step #95.

On the other hand, in the S (shutter speed priority) mode, the process proceeds from step #68 to step #73, where the manually set shutter speed Tv is read, and in the next step I74, from the above Ev value and Tv value. Aperture value Av is calculated. As a result of the determination in step #75, if the flash photography is not performed, the process proceeds to step #95, but if the flash photography is completed and charging is completed, the process proceeds to step #76.
The shutter speed is held down so that the shutter speed Tv is synchronized with the light emission of 7 lashes. After setting the aperture value Av to F5.6 in step #77, it is determined in step #78 whether it is cropping shooting,
If it is trimming photography, the aperture is shifted to the open side in accordance with the number of trimming stages in step #79, but if it is not trimming photography, the process proceeds to step #95.

If the A (aperture priority) mode is selected, the process proceeds from step #67 to step #80, where the aperture value set manually is set to A.
v is read, and in the next step #81, the shutter speed Tν is calculated from the above Ev value and Av value. Then, as determined in step #82, if it is flash photography and charging is completed, the shutter speed is set to 1760 seconds in step #83, and then the process proceeds to step #95.

On the other hand, if flash photography is not being used, the shutter speed for warning by the camera shake warning buzzer BZ is controlled based on the equivalent focal length as shown in Table 1 in step #84.

Table 1 Equivalent focal length Camera shake warning Shutter speed 35mm or less 1730 seconds 35mm -105++v+ 1 /60
105 seconds or more 1/100 seconds This means that with cameras that use cropping to increase the magnification during printing to achieve the same effect as shooting with a long focal length lens, the camera shake warning is determined simply by the focal length of the lens. There is no point in doing so, so the camera shake warning shutter speed is set according to the equivalent focal length as shown in the table above.

Also, when in P (program) mode, step #66
The program then proceeds to step 85, where a program for determining the relationship between the shutter speed Tv and the aperture value Av according to the equivalent focal length is selected, and a diagram of this program is shown in FIG.

In FIG. 18, program lines A, B, and C indicate equivalent focal lengths of 35n+n+ or less, more than +35m+o, less than 105mm, and 105nua or more, respectively. In accordance with this program line, in the next step #86, the shutter speed Tv and aperture value Av are calculated from the exposure value EV. As a result, when the equivalent focal length becomes large, a higher shutter speed is set to prevent camera shake.

In step #87, it is determined whether the shooting is cropping. If the shooting is not trimming, the process proceeds to step #90, but if the shooting is trimming, the process proceeds to step #88, and as shown in Table 2 below, the process proceeds to step #88. The programmed aperture value Av is shifted to the open side by a predetermined amount, so that the depth of field when trimming approaches the depth of field when trimming is not performed.

Table 2 Trimming size Shift amount to the open side Half size 1st step 1/4 size 2nd step Figure 19 shows the aperture IN small, 1 and 1 small N117 Tesubi Matsu Saiumachi 1-, / 2I apologize in the dark. Then, in step #89, the exposure value Eν
The program-set shutter speed Tv is corrected in accordance with the amount of shift of the aperture so that the shutter speed Tv is maintained.

If it is determined in step #90 that flash photography is not being performed, the camera shake warning buzzer B is activated in step #96.
The shutter speed for warning by Z is controlled according to Table 1 in the same manner as explained in the A mode, and then the process proceeds to step #95. On the other hand, if you are using flash photography and charging is complete, step 91. In #92, set the shutter speed Tv to 1760 seconds and the aperture value Av to F5.6
After setting the value to , proceed to step #93. Step #93
It is determined in step 15 whether or not it is cropping photography, and if it is not cropping photography, the process proceeds to step #95, but if it is trimming photography, in step #94, the process is again carried out according to the number of trimming stages as in step #88 above. Shift the aperture to the open side and proceed to step #95.

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The aperture value and the aperture value are calculated, and next I will explain the number of shots 1).

A comparison will be made with a lens replaced with a lens having the same focal length as the equivalent focal length. Further, α is the same value as used in explaining the equivalent focal length.

In general, the depth of field (front only) is It is given by a=u2・δ・F/[2...■　.

(r is the focal length of the photographic lens, F is the aperture value) When the actual focal length is [/a and the aperture is F, the depth is, from the formulas ■ and ■ above, a, = α2- u2 *δ-F/ f”...■The depth when trimmed to the equivalent focal length f/α is a'=u2
・αδ−F'/f2 = α・u2・F'/f2 ・・・■If F゛ is the aperture at the time of trimming, the depth at the time of preview is a゛=α* u 2 ・δ−F'/f2== = u 2
The actual depth can be confirmed by narrowing down the aperture to Fpv such as -δ·Fpv/f2.

As a result, Fpv=aF'... ■Also, from the formulas ■ and ■, if the aperture is the same during trimming and when shooting with a lens of equivalent focal length, F=F' up, at =:
a' ((! < 1) ...■,
It can be seen that the depth during trimming is deeper.

On the other hand, the number of shots seen from the depth of field is a, = a', which is the aperture F, so from formulas ■ and ■, F' = αF, so F
= F'/α...■ On the other hand, if you try to reduce the depth during trimming to obtain the expected depth with a lens of f/α corresponding to the equivalent focal length, the depth X at that time will be calculated from formula 0. ,X=α2*u26
δ-F'/[2, and the depth Y when cropping with the aperture open from F'' to F'' is Y=α from formula 0.
・u2・δ・F”/[2.

From the relationship of X=Y, F”=aF... [phase],
[Phase] It is only necessary to narrow it down to F'' so as to satisfy the equation.

In this way, the depth during trimming becomes deeper, so the first
In the routine for calculating the number of sheets shown in Figure 6, if the trimming size is half size, step #95-2
If the actual aperture 1) Av calculated by the calculation is set as the number of sheets, and if the trimming size is quarter size, step #95-5
The value obtained by narrowing down the actual aperture value AV by two steps is defined as the number of sheets. If the trimming is half size, the actual aperture value Av is set to 1 in step #95-3.
If the trimming is a quarter size, the actual aperture value Av is opened by two steps in step #95-6.

This is because even if the aperture is the same, photos obtained by cropping will have shallower depth than photos taken in normal shooting mode, so by operating preview type 4,
The aperture value during preview is opened by a predetermined amount so that the confirmed depth is the same as the depth of the finished photo.

As explained above, even if you set the trimming mode,
The set trimming mode is automatically canceled when it is clearly necessary to return to the normal shooting mode, such as when the main switch 2 is turned off or when the back cover 19 is opened or closed to change the film. This eliminates the need to operate the cropping switching button 1, and it is possible to avoid mistakes such as forgetting to cancel the cropping mode and taking a picture without getting the picture you expected.

In the above embodiment, the state of the lens lock button 12 for attaching and detaching the lens LN is detected, but it is also possible to detect the disengaged state of the lens LN. In this case,
It may be a switch, or it may be determined whether the signal from the lens LN is normal. In addition, the opening/closing state of the back flap 19 may be detected by detecting that the back flap 19 changes from open to closed.In a camera that automatically winds and rewinds the film, it is possible to detect when the film is finished. Princess Shitoshi
Is it obvious? ↓-ノ+l j bar V mu loquat 10 soil na bending Aw
You may also cancel the above-mentioned trimming shooting mode.

[Effects of the Invention] According to the present invention, even if the trimming mode is set, the normal shooting mode is clearly returned to when the main switch is turned off or when the back cover is opened and closed to change film. The trimming mode set above is automatically canceled when necessary, so there is no need to press the trimming switch button.
You can avoid the mistake of forgetting to cancel cropping mode and taking a picture without getting the picture you expected.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of a camera capable of cropping photography according to the present invention, and FIG. 2 is a front view of FIG. 1, @3
4 is a perspective view showing the back cover in FIG. 2, FIG. 5 is an enlarged view of the focus plate in FIG. 3, and FIG. 6(a). (b) and (e) are diagrams showing display examples of the photographing information display section in FIG. 5, FIG. 7 is an enlarged view of the display in FIG. 1,
8 and 9 are diagrams showing display examples on the display unit of FIG. 7, and FIG. 10 is a block diagram showing one embodiment of a control circuit applied to the camera capable of cropping photography shown in FIG. 11 to 16 are flowcharts showing the operation of the blocks in FIG. 10, FIGS. 17(a) and 17(b) are diagrams used to explain the equivalent focal length, and FIGS. 10 is a program diagram showing a program applied to the control block diagram of FIG. 10. FIG. 1... Trimming switching button, 2... Main switch, 3... Shutter release button, 4... Preview button, 5... Viewfinder, 6... Shutter speed up/down switch, 7... Accessories - shoe, rear = flash connector, 9...photometering mode changeover switch, 10...aperture upgrade switch, 1
DESCRIPTION OF SYMBOLS 1... Shooting mode changeover switch, 12... Lens lock button, 13... Signal transmission bin, 14... Aperture return button, 15... Mirror, 16... Reflector, 17...
... Prism, 18... Eyepiece, 19... Back,
Rrko, 20... Information transmission connector, LDI...
Display, LD2...Focal plate, LEDI, LED2...
・Light emitting diode, 100... Microcomputer, 101... Differential circuit, 102... AND circuit, 8
1 to S12...Switch, FC...Flash control section, LM...Photometering section, AC...Aperture control section, SM.
...Stepping motor, Sc...Mirror/shutter control unit, DS...Display control unit, BZ...Buzzer for camera shake warning, PC...Photography control unit, DX...Two V reading unit, LN...Lens. Patent Applicant Minolta Camera Co., Ltd. Agent Patent Attorney 2 people, 16 Figure 1 Figure 6 Shutter Release/lL. Fig. 2 15 Mirror m5 Fig. 61 EI (Ql
b) [Ko Sooji] Soot I [= Koi] Ma 10---8 Figure 6 (C
) Rollo I Eka]] Stop-0 Figure 8 Figure 9

Claims (4)

[Claims] (1) A shooting mode selection means for selecting between a normal shooting mode and a trimming shooting mode that allows specifying an area narrower than the range to be printed in the normal shooting mode, and various controls depending on the trimming size in the trimming shooting mode. Trimming characterized by comprising: a trimming control means for performing the following: a state signal output means for outputting the state of the camera as a signal; and a canceling means for canceling the trimming control means in response to a signal from the state signal output means. Camera that can take pictures. (2) The camera capable of cropping photography according to claim 1, wherein the camera status signal is a signal related to lens replacement. (3) The camera capable of trimming photography according to claim 1, wherein the camera status signal is a signal related to a film exchange operation. (4) The camera capable of trimming photography according to claim 1, wherein the camera status signal is a signal indicating when the main switch is turned off.