JP3103620B2 - Camera with zooming device during exposure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for zooming during film exposure.
The present invention relates to a camera having a during-exposure zooming mechanism for driving a zoom lens.

[0002]

2. Description of the Related Art Heretofore, in order to obtain a special photographing effect, there has been known a during-exposure zoom photographing in which a zoom lens is mounted on a camera to perform zooming during film exposure. However, since performing zooming during exposure requires skill, it is an advanced photographing technique for ordinary photographers.
Japanese Patent Application Laid-Open No. Sho 61-228426 discloses a technique for performing zooming during exposure by electrically zooming a zoom lens.

[0003] Also, JP-A-63-318531 discloses that
When performing zooming during exposure while the main subject is on a dark background, exposure is performed for a certain period to capture the background, and then zooming is started. A technique is disclosed in which the magnification is fixed and an appropriate exposure is obtained.

[0004]

By the way, the time between exposures is reduced.
In the case where zooming is performed after exposing for a certain period of time by combining zooming and flash photography, it is preferable that the flash emission timing be as close to the end of exposure as possible. This is because, when the main subject is a person, it is considered that the photographing has been completed by the strobe light, and even though the exposure is still being performed, the subject is moved, resulting in an unpleasant photograph. To deal with this problem, the above-mentioned JP-A-63-318531, which is effective in the second curtain sync shooting, has the following problems.

That is, the main subject does not become a desired size due to the timing of the start of zooming and the timing of strobe light emission. Specifically, the above-mentioned JP-A-63-3
According to No. 18531, the zoom between the second curtain and the exposure
In the case of combining the zooming, the strobe emits light during zooming, so that the magnification of the main subject is not known until a photograph is completed.

Further, when the zoom lens causes zooming focus movement, the main subject is photographed with the focus out of focus. That is, zooming is started in a state where the main subject is in focus, and when a strobe is fired during zooming, the main subject to be photographed by the light emission is out of focus due to zooming focus movement of the lens. turn into.

The focusing apparatus of the present invention has been made in view of such a problem. The purpose of the focusing apparatus is to start the inter-exposure zooming after exposing for a certain period, and to mainly use a strobe light. In a camera that performs zooming during exposure so as to obtain an appropriate exposure of a subject, the zooming during exposure allows the main subject to be photographed in a desired size and a photograph in which the main subject is in focus. An object of the present invention is to provide a camera having a zooming function.

[0008]

In order to achieve the above object, a first aspect of the present invention is to provide an electric zoom lens using an electric zoom lens.
A camera having a zooming apparatus during exposure capable of zooming.
Zooming on the electric zoom lens
And the brightness of the subject.
Metering means, and an inter-exposure zoom to set the inter-exposure zoom mode.
Zoom mode setting means,
When the during-exposure zoom mode is set by the step
A zoom during exposure based on an output from the photometric unit.
Calculating means for calculating a shutter speed appropriate for the mode;
Shutter control means for controlling the opening and closing of the shutter.
If the during-exposure zoom mode is set,
The shutter speed corresponds to the shutter speed after the shutter is opened.
After a lapse of time, the zoom lens driving means
Performs a predetermined zooming operation on the electric zoom lens
After the zooming operation is completed, the shutter control
The shutter is closed by control means .

The second invention is directed to the first invention.
The time corresponding to the shutter speed is determined by the photometric unit.
Is determined based on the output from the
You. The third aspect of the present invention uses an electric zoom lens for exposure.
Has an exposure-to-exposure zooming device capable of inter-light zooming
In the camera, the electric zoom
Set the zoom mode during exposure to zoom the lens
For the inter-exposure zoom mode setting means and the shutter closing operation
Set the second curtain sync mode to fire the flash in sync.
And a rear curtain sync mode setting means for setting
When the during-exposure zoom mode is set and the
When the mode is set, the shutter closing operation is the same.
Before the shutter closing operation and the zoom
Fire the strobe at the timing before the start of the
It is made to light .

[0010]

According to the first aspect of the present invention, the zoom during exposure is provided.
The inter-exposure zoom mode is set by the mode setting means.
Calculation based on the output from the photometric
Calculates the appropriate shutter speed for the during-exposure zoom mode
You. When the during-exposure zoom mode is set,
Time corresponding to the above shutter speed after shutter opening
After the elapsed time, the zoom lens
The zoom lens performs a predetermined zooming operation.
After the end of the zooming operation, the shutter
Close the shutter.

According to the second aspect of the present invention, the shutter
The time corresponding to the speed depends on the output from the photometric means and the film.
Determined based on sensitivity. Further, according to the third invention,
When the inter-exposure zoom mode is set and the
Is set, the shutter is closed
Without zooming, before shutter closing operation
The flash fires at a timing before the operation of
You.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

First, as a first embodiment of the present invention, a specific example of the during-exposure zooming apparatus used in a camera having the during-exposure zooming apparatus according to the present invention will be described. FIG. 1 is a block diagram schematically showing such a during-exposure zooming apparatus.

In FIG. 1, reference numeral 101 denotes a photometric unit; 102, a calculating unit for calculating the amount of light from the output of the photometric unit 101;
Reference numeral 03 denotes an aperture, 104 denotes an aperture control unit that controls the aperture 103 based on a calculation result of the calculation unit 102, 105 denotes an exposure timer that measures an exposure time, 106 denotes a shutter control unit that controls opening and closing of a shutter, and 107 denotes an exposure time. Exposure time comparing means for comparing and judging whether or not it is time to obtain a photographing effect of zooming during exposure, 108 is a zooming timer for measuring a zooming time, 109 is a zoom lens,
Reference numeral 0 denotes a zoom lens driving unit that drives the zoom lens 109, 111 denotes a zoom lens position detecting unit that detects the position of the zoom lens 109, and 112 stores data for determining a zooming direction when performing zooming during exposure. Storage means; 113, a zooming direction instructing means for instructing a zooming direction; 115, a first switch of a release button (hereinafter referred to as first release); 116, an output of the zooming direction instructing means; 110 to input or storage means 112
Is a changeover switch for selecting whether or not to input the data. Further, reference numeral 117 denotes a strobe control unit for controlling strobe light emission, and reference numeral 118 denotes a strobe mode setting means for designating a strobe light emission mode.

In this configuration, when the first release 115 is turned on, the changeover switch 116 is operated, and the output of the zooming direction instructing means 113 is input to the storing means 112 and stored in the storing means 112.
This stored data is used for indicating the direction of zooming during exposure. Whether or not zooming during exposure can be performed is determined by the exposure time comparison unit 107 when a preset exposure time has elapsed. Here, when it is determined that zooming during exposure can be performed, the zoom lens driving unit 110 controls the zoom lens 10.
9 is performed (zooming), and when it is determined that zooming during exposure cannot be performed, the shutter is closed by the shutter control means 106. Note that the zooming ends when the zoom lens position detecting unit 111 detects the end of the zoom lens or when the zooming timer 108 finishes a predetermined time measurement. Next, as a second embodiment of the present invention, a specific example of a camera having the during-exposure zooming device according to the present invention will be described. FIGS. 2 and 3 are block diagrams showing a system outline of a camera having the during-exposure zooming device of the present embodiment.

As shown in FIG. 1, the camera having the during-exposure zooming apparatus according to this embodiment is roughly divided into a main CPU 200, an interface IC 210, a power supply unit 220, a strobe unit 230, a mirror / shutter unit 240, and a winding unit. 250, a lens unit 260, a finder unit 270, a display unit 280, and an AF unit 290. Hereinafter, each block will be described in detail.

A main CPU 200 controls the entire camera, and includes an interface IC 210 and an LCD (described later) via a serial communication line 201.
IC283, AFIC292 and E ² PROM209
And exchange data.

A dedicated data line 208 is provided between the main CPU 200 and the interface IC 210.
For exchanging information that cannot be transmitted by serial communication, such as a power supply voltage, a photometric output analog signal, and a signal after shaping the waveform of a photointerrupter. The analog signal is input to the A / D conversion port of the main CPU 200, and is converted into a digital signal in the main CPU 200. Similarly, the charging voltage of the strobe divided by the voltage dividing circuit 237 described later is also input to the A / D port of the main CPU 200. The main CPU 200 includes:
Four interrupt ports are provided, and a PW switch 217, a BK switch 218, and a PUP
The switch 216 is connected to the KEYINT. Other input / output ports are normal input / output ports. Sequence switches such as a DX switch for reading DX information of the cartridge and an X switch for detecting whether or not the front curtain of the shutter has completed traveling are directly connected to the main input / output port. It is read by the CPU 200.

The interface IC 210 includes motors (mirror shutter motor 242, winding motor 25).
1, zoom motor 265, AF motor 261) and
Magnets (shutter magnets 241a, 242b,
A drive circuit for the aperture magnet 263), a control circuit for outputting a charge signal to the strobe booster 231 and an ON signal to the DC / DC converter 222;
Analog processing units such as a photometric circuit for logarithmically compressing the output of the photometric photodiode 273, a waveform shaping circuit of a photo interrupter (AF photo interrupter 262, aperture photo interrupter 264, film detection photo interrupter 252), and switches. And a digital unit for performing serial communication and data latch. Here, since a large current is required for driving the motor, a motor driver 214 is also provided outside.

The key switch group 213 includes a first release switch, a second release switch, a ZOOM
Tele switch, ZOOM / WIDE switch, SH
An IFT / UP switch, a SHIFT / DOWN switch, a SELF switch, and a SPOT switch are read by the main CPU 200 through serial communication. The key switch group 213 also includes
5-bit zoom encoder and S for collapsing position detection
There is a B switch, which is read into the main CPU 200 by serial communication as described above.

The power supply unit 220 supplies two systems of power. One is a power source used for a driver that needs power, such as a motor and a magnet, and is always supplied with a battery voltage. The other is a DC / DC converter 22.
2 is a small-signal power source stabilized by the IC 2 and controlled by the interface IC 210.

The strobe unit 230 includes a main capacitor 232, a strobe booster 231 for charging the main capacitor 232, a voltage divider 237 for dividing the voltage of the main capacitor and causing the main CPU 200 to monitor the voltage, and a Xe. Tube 233 and this Xe tube 23
3 for emitting light. The flash booster circuit 231 is controlled by a signal from the interface IC 210. Further, the main CPU 200 controls the execution or stop of the charging by the interface IC 210 based on the output of the voltage dividing circuit 237.
To instruct. Here, the Xe tube 233 is connected to the main CPU 2.
Light emission is performed by the X.ON signal from 00.

The mirror / shutter unit 240 includes a mirror / shutter motor 242 for moving up and down the mirror and charging the shutter by forward rotation, and two shutter magnets 241a and 241b for controlling the front curtain and rear curtain of the shutter. Consists of

An X switch (not shown) is a switch for notifying that the focal plane shutter is fully opened, and is for taking a flash emission timing. The reverse rotation of the mirror / shutter motor 242 is sent to the cartridge chamber by a gear train and used for rewinding.

The hoisting unit 250 includes a hoisting motor 2
51 and a photo-interrupter 252 for film detection. The winding of the film is performed by the forward rotation of the winding motor 251.

The lens unit 260 includes an AF motor 261 used for performing focusing, and an AF photo-interrupter 26 for generating a feedback pulse.
2, an aperture magnet 263 for stopping aperture stop,
Aperture photo interrupter 264 for detecting the amount of aperture
And a zoom motor 265 for performing zooming, a 5-bit zoom encoder 266 for detecting the absolute position of the zoom lens, and an SB switch 267 for detecting the retracted position of the zoom, and controls the aperture of the lens. ing. The AF motor 261 is driven by an amount corresponding to the amount of defocus measured by the AFIC 292. Also, AF
The driving amount of the motor 261 is determined by the AF photointerrupter 2.
The number of feedback pulses is 62. further,
The absolute distance to the subject required for controlling the strobe G number can be obtained by integrating the number of pulses of the AF photo-interrupter 262 after resetting the lens to infinity. The zoom motor 265 is a motor for zooming a lens (not shown) or performing a collapse operation when not in use, and is controlled by an absolute position by a zoom encoder 266 and an SB switch 267. The zoom encoder 266 is provided via the interface IC 210,
The absolute position is notified to the main CPU 200. The SB switch 267 is provided at the collapsed end of the lens, and detects the completion of the collapse. The retracted position is also released from the WIDE end of the zoom encoder 266. An aperture (not shown) is mechanically stopped down by a spring at the same time as the mirror is raised, and when the set aperture value is reached, the attraction of the aperture magnet 263 is released and the aperture stop is stopped halfway. It has become. Detection of the narrowing amount
The rotation is performed by detecting the rotation of the gear in conjunction with the aperture blades being stopped down by the aperture photo interrupter 264.

The finder unit 270 is an optical system for guiding a subject image reflected on a reflex mirror (not shown) and formed on a Fresnel lens to an eyepiece.
The electrical components arranged here are an LCD 271 for display in the viewfinder for performing display in the viewfinder and a photodiode 273 for photometry. The photocurrent generated by the photodiode 273 is sent as it is to the interface IC 210, where it is subjected to current / voltage conversion internally, and
To the A / D port.

The display unit 280 is provided in the rear cover of the camera, and has an LCD panel 281, a key switch group 282 provided on the rear cover, and an LCD IC 2 for driving the LCD panel 281 and reading the key switch group 282.
83 are arranged.

The key switch group 282 includes a MODE switch, a +/- switch, a PF switch, a Z-MEMO switch, a MACRO switch, a REWIND switch,
DRIVE switch, SUBJECT switch, FLA
The SH switch is connected. The on / off of these switches is controlled by the main CPU via the LCD IC 283.
200.

The AF unit 290 includes an AF sensor 291
And AFIC292. E ² PROM2
Reference numeral 09 is used as a means for storing data which is to be retained even when the power is turned off among data stored in the RAM in the main CPU 200.

The PW switch 217 is a power switch of the camera, and when turned on, the voltage of the battery 221 is changed to the main CP.
U200 is supplied to the stabilized power supply,
A power-on reset is applied to the PU 200, and the operation is started from the beginning of the program to prepare for shooting. B
The K switch 218 is a switch linked to the back cover.
As with the W switch 217, when the back cover is opened, the main C
Power is supplied to the PU 200. However, this is because when the back cover is closed, the film is loaded even if the PW switch 217 is off.
Even if only the BK switch 218 is turned on, preparation for photographing is not performed. When the main CPU 200 starts operating, the DC / DC converter 222 is started via the interface IC 210, and power is continuously supplied to the main CPU 200 even if the PW switch 217 and the BK switch 218 are turned off. At this time, the main CPU 200 executes processing (collapse, E
^Two After saving data to PROM 209)
The DC / DC converter 222 is stopped. The PUP switch 216 is a switch that detects the pop-up of the strobe and permits charging and emission of the strobe. KEYI
NT is an N of a signal when one of the first key switch group 282 input to the LCD IC 283 is pressed and an output signal of the interface IC 210.
This is an output signal of the OR gate 215. Next, the operation of the camera having the during-exposure zooming device shown in FIGS. 4 and 5 are flowcharts (main routine) schematically showing the operation of the main CPU 200.

The photographer sets a PW switch 217 for photographing.
Is turned on or the back cover is opened for film loading, the BK switch 218 turns on and the main CPU
200 starts. When the main CPU 200 starts,
The program is executed according to the flowcharts shown in FIGS. A002 is a process for setting a stack and prohibiting an interrupt.

A004 is an initial process at power-on. This initial processing includes the interface IC 21
0, activation of the DC / DC converter 222 through communication to the interface IC 210, E ² PROM
209, initialization of a random access memory (RAM) in the main CPU 200, initialization of an I / O port of the main CPU 200, and the like.

A006 is a mode switch input subroutine. This mode switch input subroutine includes the LCD IC 283 and the interface IC 21
0 (key switch groups 213, 28)
The state of 2) is read into the main CPU 200 by serial communication, and the edge is detected by comparing with the previous data. However, the purpose here is to input the switch initial state immediately after power-on. A008 is a process for resetting data such as the state of charge of the strobe. A016 is
This is the initialization of the camera mechanism in preparation for the exposure operation. A034 is a photometry subroutine. here,
Enter the initial photometric value.

A038 is for resetting the request code. When a branch from the main routine is required according to various information, a request code corresponding to the branch is set. This request code is 1-byte data and 0
When it is 0H, the main loop is repeated without branching.

The following is a portion corresponding to the main loop. There are two main loops in the main loop. First
Is a loop consisting of A040 and A070 to A152, which is always executed. In addition, 100
A400 to A0 when msec timer overflows
A second loop consisting of 68 is executed. Hereinafter, each process of the main loop will be described. A040 is a process for refreshing the I / O port of the main CPU 200.

A042 checks whether or not the timer of 100 msec has overflowed. If overflow has occurred, the timer of 100 msec is restarted by A044.

In A046, the PW switch 217, BK
The state of the switch 218 and the state of the PUP switch 216 for detecting the use / storage state of the built-in strobe are determined by the main CPU 2.
00, and compare with the previous data to turn off → on /
Detects on-off edges. A048 is the above-mentioned A
This is the same mode switch input subroutine as 006.

A050 is a mode / request code setting subroutine, which sets the branch request code from the main routine, the operation mode of the camera, and the setting of data according to the state of each switch input in A046 and A048.
Make changes. This subroutine will be described in detail with reference to FIG. Here, the mode data is changed or the request code is set based on the state of each switch and the data of the state change inputted in A046 and A048.

In G000, the BK switch is changed from ON to OF
It is determined whether the status has changed to F, that is, it is determined that the rear cover of the camera has been closed. As a result, a request code for the initial load is set in G002.

In G004, it is determined whether or not the PW switch is ON. If it is OFF, a power down request code is set in G006. G008 is REWIN
It is determined whether the D switch has been turned on.
At 010, a rewind request code is set. G012
Now, determine whether the SUBJECT switch has been turned on,
When turned on, the subject mode data is
Change the data. The subject modes include a night view photographing mode capable of performing the zooming between exposures according to the present invention and an automatic mode such as a portray mode for photographing a person beautifully. . When the user wants to perform zooming during exposure, it is necessary to set the night view photographing mode by pressing the SUBJECT switch.

In G016, the FLASH switch is turned on.
It is determined whether or not the flash mode has been turned on. If it is turned on, the data of the strobe mode is changed in G018. During exposure, this data is used to control the first synchro emission, the second synchro emission, and the like.

G020 and G022 determine whether the ZOOM switch is ON. If the ZOOM switch is ON, it is further determined at G024 whether the fast release switch is ON. Far
If the streak switch is off, the power demand request code is set, but if it is on, it is further determined at G028 whether or not the night view mode has been set. If so, the during-exposure zoom flag is set. During the exposure, the zoom during the exposure is executed by this flag. As for the zooming direction, A048 indicates Z
Since the state of the OOMTELE switch and ZOOM WIDE switch is stored in the main CPU or RAM,
It is not necessary to keep the ZOOM switch pressed during exposure.

A058 is a photometry subroutine. When a command is transmitted to the interface IC 210, a voltage proportional to the logarithmic value of the photocurrent of the photodiode due to the reflected light from the subject incident through the lens is output. This is subjected to A / D conversion by the main CPU 200, and the brightness (Brightness Value: BV value) of the subject is calculated.

A064 is an APEX calculation subroutine. In this subroutine, the brightness data of the subject calculated in A058 and the mode set in A050
The F number, the shutter speed, the G number of the flash, and the like are calculated based on the flash data and the flash data. This will be described with reference to FIG.

As is generally known, the exposure parameter
The relationship between the data is represented by BV + SV = EV = TV + AV.
The luminance calculated by A058 using this relationship is shown. A parameter (Sensitiv) representing the film sensitivity obtained from the parameter (Brightness Value: BV) and the state of the DX switch.
The sum of the eness Value: SV) is a parameter representing the exposure time (Time Value: TV) and the parameter representing the aperture diameter (Ap
erture Value: AV).

In H000 to H004, the exposure value (Exposu
re Value: EV), that is, BV + SV. What is +1 when H004 is in night view mode?
This is a process for correcting the exposure amount by one step. In other words, a photograph taken in the night view mode has an exposure amount that is half that of a normal image, so that the image looks more like a night scene, and the total exposure amount is off even when the after-exposure zoom described later is performed. -No bar. In H006, TV is obtained. The TV for the EV is predetermined.

At H008, it is determined whether or not the strobe is ready to emit light. That is, the PUP switch is ON
If the charging is completed, the process jumps to H010, otherwise jumps to H018. In H010, if the shutter speed corresponding to the TV determined in H006 is slower than the flash synchronization time (1/100 second in this embodiment), the flash flag is set in H012 and the flash shooting mode is set.
To In this case, the shutter speed is fixed at the time of flash synchronization, but is not fixed at the time of synchronization when the night view mode is selected.

In H018, A is set for the determined TV.
AV is obtained from V = EV-TV. With the above, the shutter speed and the aperture F number for the exposure have been calculated.
In the case of flash photography, the amount of flash light emission is further calculated. Generally, the appropriate light emission amount is (guide number) =
It is known that it is determined by (F number) × (distance).

In H022, the light emission amount is calculated in accordance with this relationship.
GV (Guide Number Value) = AV + DV (Distance V)
alue). Here, GV = 2 log ₂ (guide number) and DV = 2 log ₂ (distance). The under correction is performed in the night view mode when obtaining the TV and AV in the first half, but the strobe light emission amount follows this idea, and in the night view mode, -0.5 EV is used in H026.
Is under-corrected.

In A068, display data such as a mode and photometric data is decoded and sent to the LCD IC 282 by the serial communication line 201, whereby the LCD I
The display data of C282 is updated.

The above is the second loop. This second loop is executed every 100 msec. Since the basic operation of the camera is performed in the second loop every 100 msec, mode setting, photometry, display, etc.
It will be updated every msec. Next, a first loop process which is always executed regardless of the timer of 100 msec will be described.

A070 is a charge control subroutine for controlling charging of the built-in flash. Main CPU
When detecting that the PUP switch 216 has been turned on, the 200 transmits a start command of the flash booster circuit 231 to the interface IC 210, and
31 starts charging. The voltage of the capacitor is input from the voltage dividing circuit 237 to the A / D conversion board of the main CPU 200. When the voltage of the capacitor reaches a predetermined voltage, the main CPU 200 sets a charge completion flag, whereby the flash booster circuit 231 stops charging. A074 inputs the state of the first stage (first release switch) and the second stage (second release switch) of the release switch. A076 is an exposure determination / exposure subroutine, which is a subroutine for determining a branch to an exposure sequence and performing exposure, as described later.

In A078, it is determined whether or not the exposure has been performed in A076. If the exposure has been executed, the process jumps to A044. If the exposure has not been executed, A080 is executed.
The following processing is performed. In A080 to A116, the above A
Various processes are executed according to the branch request code determined in 050.

First, A080 determines whether a power down request has been made in A050. If it is determined that a power down request has been made, a power down process is performed in A082. If the PW switch 217 or the BK switch 218 is turned on, the process jumps to A002, and the execution of the program is restarted.

If it is determined in A080 that the power down request has not been made, the process of A088 is executed. In A088, it is determined whether or not an initial load request has been made in A050. If it is determined that the request for the initial load has been made, the processing of the initial load is performed in A090. The initial load is an operation of winding up the film to a position where the photographer can take a picture when the photographer newly loads the film. When the film is fed to a predetermined position, the process jumps to A138.

If it is determined in A088 that the initial load request has not been made, the process of A092 is executed. In A092, it is determined whether or not a rewind request has been made in A050. If it is determined that a rewind request has been made, a rewind operation is executed in A094. Rewinding is an operation of rewinding a film that has been shot (or has been shot halfway) into the cartridge. Thereafter, the request command is reset in A138, and the process jumps to A044 described above.

In A114, it is determined whether or not the power zoom has been requested in A050. If it is determined that the power zoom request has been made, A116
To perform power zoom. What is power zoom?
The M-TELE switch and the ZOOM-WIDE switch are monitored, and the zoom motor 265 is rotated in the direction of the operated switch, and the ZOOM-TELE switch or the ZOOM-WIDE switch is turned off or the zoom lens is turned off. Tele end or WIDE
When the end is reached, the zoom motor 265 is stopped, and then
At A138, the request code is cleared and the routine jumps to A044.

If it is determined in A114 that a request for power zoom has not been made, the process in A152 is executed. A152 is an AF control subroutine. This A
In the F control subroutine, first, integration of the AF sensor for distance measurement is started to perform AF distance measurement calculation. If the first release switch is turned on, the lens is driven for focusing. Subsequently, a focusing flag is set at the time of focusing, and a focusing impossible flag is set at the time of focusing failure. These flags are used to determine whether or not to start exposure, and to display the in-focus and out-of-focus in A068. Also, distance data for calculating the amount of light emission of the strobe is calculated here. Next, the exposure determination / exposure subroutine indicated by A076 in the main routine (FIG. 4) will be described with reference to FIGS.

In this subroutine, as described above,
The determination of the branch to the exposure sequence and the exposure are performed. The exposure flag 1 is a flag for determination when returning to the main routine, and is used in A078 of FIG. This flag is set to “1” when exposure is performed,
If not performed, it becomes "0".

First, it is checked whether the first release switch is on or off at E008. Further, when the first release switch is on, at E01
If the value is 0, the on / off of the second release switch is checked. Here, when one of the first release switch and the second release switch is off, the process jumps to E038, and when both of them are on, the process jumps to E038.
020.

In E020, it is determined whether or not focusing has been performed. The focus is determined by the focus flag. The focusing flag is set if the AF process has been completed in A152 of FIG. If it is determined that focusing has not been performed, the process jumps to E038. On the other hand, when it is determined that focusing has been performed, the focusing flag is subsequently cleared at E050. E056
The exposure subroutine is executed to perform exposure. After exposure, each flag is set / reset (E064-E070),
Return to main routine. Next, the exposed subroutine indicated by E056 will be described. FIGS. 8 and 9 are flowcharts showing the exposed subroutine.

First, the charging of the strobe is stopped in F002. In F004, mirror up and aperture down are performed. In F006, it is determined whether the during-exposure zoom is selected. When the during-exposure zoom is selected, F008
Use to set the zooming timer. Zooming timer is set to the same value as the exposed second Tokita timer.

In F012, it is determined whether or not the shooting mode is the bulb mode. The bulb shooting is a shooting mode in which exposure is continued while the release switch is pressed, and in this case, the exposure second timer is not started. Exposure processing is performed after F016. First, F016
Then start the first curtain. Thereafter, F018 to F034
Exposure is continued while the loop is repeatedly executed. The end of the exposure is basically based on the end of the timer of F018.

In F020, the shutter speed is 1/1
It is determined whether or not the speed is lower than 00 seconds. If the speed is higher than 1/100 seconds, the process jumps to F018. That is, when the shutter speed is faster than 1/100 seconds, only by the end of the timer F018, and terminates the exposure.

In F022, it is determined by the X switch whether or not the front curtain running has been completed. If it is determined that the front curtain running has not ended, the process jumps to F018. When the first-curtain running is completed, it is determined in F024 whether or not the current mode is the first-curtain sync mode, and in the case of the first-curtain sync mode, the strobe light is emitted in F026.

Next, at F028, the shutter speed becomes 1
Judge whether the exposure is longer than / 8 seconds.
If it is faster than 8 seconds, the process jumps to F018. On the other hand, if it is longer than 1/8 second, the on / off of the PW switch 217 is checked in F030, and the PW switch 217 is checked.
Is off, the process jumps to F036. That is, when the shutter speed is the long exposure time longer than 1/8 second, the exposure is also terminated by turning off the PW switch 217.

Next, in F032, it is determined whether or not bulb shooting has been performed. If it is not bulb shooting, the process jumps to F018. On the other hand, if it is bulb shooting,
The on / off state of the first release switch is checked. If on, the process jumps to F018, and if off, the exposure ends. In other words, if it is bulb shooting,
The exposure is ended by turning off the first release switch.

When the exposure is completed, it is checked again whether or not the shutter speed is longer than 1/100 second.
If the speed is lower than 100 seconds, it is checked whether or not the rear curtain sync mode is set. Here, in the second curtain sync mode, the flash emission control is performed in F040.

Further, in the night view mode, the shutter speed is longer than 1/3 second (F042), and
If the during-exposure zooming is selected (F044), this during-exposure zooming is performed at F046. The during-exposure zooming is, literally, an imaging method in which zooming is performed during exposure to continuously change the focal length of the lens. In the camera of this embodiment, the ZOOM / WIDE switch or the ZOOM / TELE
Zooming is performed until the lens hits the end in the direction indicated by the switch, or until the zoom timer expires. The direction of the ZOOM switch is stored in the main CPU or RAM as described above. Upon completion of the above processing, the exposure is completed by running the rear curtain in F049, and then the mirror is lowered, the aperture is opened in F050, and the like, to prepare for the next exposure.

Hereinafter, the night view mode will be described. In this embodiment, as a feature of the night view mode, (1) when shooting a dark scene such as a night view, the program exposure is negatively corrected before shooting to reproduce the scene as seen by the naked eye. (2) The flash has long-time sync and second-curtain sync, and (3) the flash G number is corrected to match the dark background. (4) The ability to perform inter-exposure zooming with simple operations, (5) The ability to perform infinity shooting for long-distance subjects where AF is not possible due to low brightness, etc. can give. In the present embodiment, a photograph taking advantage of these features can be obtained by selecting the night view mode and photographing.

The night view mode is provided in the subject mode, and can be set by pressing the SUBJECT switch several times. When the night view mode is set, data for displaying a night view mark on which a moon and a star are designed on the LCD panel 281 is transmitted to the LCD IC 283. In the night view mode, the photometric value is corrected by one step to shift the program. Normally, the exposure of the camera is adjusted based on the gray subject, so that if a dark scene is photographed as it is, the photograph will be brighter than the scene seen by the naked eye. To solve this drawback, the program has been shifted so that the photograph is closer to the scene seen by the naked eye. Also, the light amount of the strobe is corrected to be 0.5 steps lower. As a result, a natural photograph can be obtained without overemphasizing a person in a dark background.

Flash photography includes first-curtain synchronization and second-curtain synchronization. Generally, in long-time sync shooting,
Using rear-curtain sync will give you a more natural picture. The light emission timing of the first curtain sync and the second curtain sync has been described with reference to FIG. Since the focal point of the lens of this embodiment moves due to zooming, for the second curtain sync,
By emitting light before driving the lens, it is possible to prevent a blurred photograph. In addition, A of the camera of the present embodiment
F indicates that the subject light incident through the taking lens is 2
Since a so-called phase difference method is adopted in which light is divided into optical paths and compared, distance measurement may not be possible for a low-luminance subject. For this reason, the AF auxiliary light (auxiliary light LED 212) is used to measure the distance of a low-luminance object. However, when the object is at a long distance such as a night scene, the effect of the AF auxiliary light cannot be expected. Therefore, in the night view mode, when the distance cannot be measured even when the AF auxiliary light is used at low luminance, it is determined that the subject is far away, and the focusing flag is forcibly set while the focusing lens is at the infinite position. Allow exposure.

Next, zooming during exposure will be described.
In-exposure zooming is a photographing method in which zooming is performed literally during exposure. In general during-exposure zooming, a main subject is shot using a strobe, and then zooming is performed to take a photograph that flows around. However, there may be situations where the main subject is far away from the strobe light or where the strobe is not desired. In such a case, unless the main subject is imaged without using a strobe, there is a high possibility that the photograph will have an unclear nucleus.

The present camera performs effective inter-exposure zooming without using a strobe. As described with reference to FIG. 9, when the exposure time is longer than 1/3 second, zooming during exposure is enabled. In the during-exposure zooming of this embodiment, zooming is performed after normal photographing is performed, including flash emission. here,
What is different from the related art is that a predetermined exposure is completed before zooming is started, and in the sequence of F036 to F048 in FIG. The point is that the shutter closes after the shutter is closed. Zooming is controlled by the exposure time and the output of the zoom encoder, and drives the zoom lens for a time equal to the exposure time or until it reaches the end. By this method, it is possible to take a during-exposure zoom photograph in which the main subject is clearly photographed regardless of whether or not a strobe is used.

The execution determination of the zooming during exposure and the direction of the zooming can be performed by the ZOOM / TELE switch or the Z
This is performed by the OOM / WIDE switch. The operation procedure is
When the first step of the release switch is pressed and focus is achieved,
While holding down the release switch, the zooming direction is determined by the ZOOM / TELE switch or the ZOOM / WIDE switch. The state of the ZOOM TELE switch or the ZOOM WIDE switch at this time is stored in the RAM of the main CPU 200. Pressing the release switch further from this state starts exposure,
ZOOM TELE switch or ZOOM stored
Zooming is automatically performed in the direction of the WIDE switch. Therefore, after exposure starts, ZOOM ・ TELE
The switch and ZOOM / WIDE switch may be turned off. Although not shown, when the power focus mode is selected, the zoom lens is switched to the focusing lens, and the zoom motor is switched to the AF motor, thereby switching to the defocusing photographing during exposure by exactly the same operation as the zooming during exposure. It is also easy.

FIG. 10 is a timing chart for explaining zooming during exposure. When the first release switch (first release switch) is turned on, normal zooming is prohibited and the zoom direction instruction switch (Z
The state of the OOM / TELE switch and the ZOOM / WIDE switch) is stored in the RAM of the main CPU 200.
This data is about 100 msec until the release starts.
The zooming direction can be switched until the release is started. Next, when the second stage (second release switch) of the release switch is turned on, the release is started. When the release starts,
First, mirror up and aperture down are performed. The mirror-up is performed by rotating the mirror shutter motor forward while monitoring the MU switch that is turned on when the mirror-up is completed by the main CPU 200. On the other hand, the aperture is stopped by monitoring the output of the aperture photo interrupter 264 and releasing the aperture magnet when the aperture is stopped down to the target F-number. After the MU switch turns on and stops the motor and waits for the time when the mirror is bouncing,
The shutter magnet 241 (F) is released, and the first curtain of the shutter is started. At the same time, the main CP
The exposure timer of U200 is started. When the traveling of the front curtain is completed, the X switch is turned on.
00 outputs a strobe synchro emission signal of the strobe in synchronization with this. Thereafter, the main CPU 200 monitors the exposure timer, and outputs a rear curtain synchro emission signal of the strobe when the exposure time has elapsed. If zooming during exposure is not performed, the shutter magnet 241 (S) is released to start the rear curtain of the shutter, but if zooming during exposure is performed, the exposure timer is started again. Thereafter, the exposure timer is used as a zoom timer. At the same time as the timer starts,
Start the rotation of the zoom motor to zoom in the previously stored direction. Zooming is continued until the timer overflows or until it is determined from the output of the zoom encoder that the zoom lens has reached the TELE end or the WIDE end. When the zooming is completed, the second curtain is started and the exposure is completed. After the exposure, the mirror is lowered and the film is wound up by one frame.

In this way, by performing the during-exposure zooming, it is possible to take a during-exposure zoom photograph in which the main object is clearly photographed, regardless of whether or not the strobe is used.

[0079]

As described above in detail, according to the camera having the during-exposure zooming device of the present invention, it is possible to easily and appropriately take a photograph by the during-exposure zooming when using a strobe.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing a during-exposure zooming apparatus according to a first embodiment of the present invention.

FIG. 2 is a part of a block diagram showing a system outline of a camera having a during-exposure zooming device according to a second embodiment of the present invention.

FIG. 3 is a part of a block diagram showing a system outline of a camera having a during-exposure zooming device according to a second embodiment of the present invention.

FIG. 4 is a part of a flowchart schematically showing the operation of the main CPU shown in FIGS. 2 and 3;

FIG. 5 is a part of a flowchart schematically showing the operation of the main CPU shown in FIGS. 2 and 3;

FIG. 6 is a part of a flowchart for explaining an exposure determination / exposure subroutine shown in FIG. 4;

FIG. 7 is a part of a flowchart for explaining an exposure determination / exposure subroutine shown in FIG. 4;

FIG. 8 is a part of a flowchart for explaining the exposure subroutine shown in FIG. 7;

FIG. 9 is a part of a flowchart for explaining the exposure subroutine shown in FIG. 7;

FIG. 10 is a timing chart for explaining zooming during exposure.

FIG. 11 is a flowchart for explaining a mode / request code setting subroutine shown in FIG. 4;

FIG. 12 is an APEX calculation flowchart.

[Explanation of symbols]

101 photometric means, 102 arithmetic means, 103 aperture,
104: aperture control means, 105: exposure timer, 106
... Shutter control means, 107 ... Exposure time comparison means, 10
8 Zooming timer, 109 Zoom lens, 11
0: zoom lens driving means, 111: zoom lens position detecting means, 112: recording means, 113: zooming direction instructing means, 115: first-stage switch of a release button (fast release), 116: changeover switch, 1
17: Strobe control means, 118: Strobe mode setting means, 200: Main CPU, 210: Interface IC, 220: Power supply unit, 230: Strobe unit, 240: Mirror / shutter unit, 250: Winding unit, 260: Lens unit 270 finder unit 280 display unit 290 A
F unit.

Continuation of front page (56) References JP-A-4-159525 (JP, A) JP-A-3-233526 (JP, A) JP-A-4-159528 (JP, A) JP-A-3-230134 (JP) JP-A-63-318531 (JP, A) JP-A-4-348330 (JP, A) JP-A-2-5034 (JP, A) JP-A-64-44923 (JP, A) 2-93627 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 15/00-15/05 G03B ^7/ 00-7/28

Claims (3)

(57) [Claims] 1. A camera having a during-exposure zooming device capable of performing during-exposure zooming using an electric zoom lens .
And a zoom lens for performing zooming on the electric zoom lens.
Lens driving means, photometric means for measuring the brightness of the subject, and during-exposure zoom mode setting for setting the during-exposure zoom mode
Means and an inter-exposure zoom mode setting means.
When the mode is set, the output from the
Shutter speed appropriate for inter-exposure zoom mode based on force
A calculating means for calculating a degree, comprising a shutter control means for controlling the opening and closing of the shutter, and when the exposure zooming mode is set, the sheet
Time corresponding to the shutter speed since shutter opening
After elapse, the zoom lens driving means
The electric zoom lens performs a predetermined zooming operation,
After the zooming operation is completed, the shutter control
A camera having a during-exposure zooming device, wherein the shutter is closed by a step . 2. The time corresponding to the shutter speed is set to
Determined based on the output from the photometer and the film sensitivity
2. An apparatus for zooming during exposure according to claim 1, wherein:
With a camera. 3. A zoom during exposure using an electric zoom lens.
Camera with an exposure-to-exposure zooming device
And Zooming the electric zoom lens while the shutter is open
Set the during-exposure zoom mode to
Setting means, After firing the flash in synchronization with the shutter closing operation
Setting the second curtain sync mode
Steps and With The inter-exposure zoom mode is set and the
When the black mode is set, the shutter
Are not synchronized, before the shutter closing operation and
Flash at a timing before the zooming operation starts
To emit light Zoom between exposures
Camera having a printing device.