JPH09211684A - Camera with magnetic recording function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record a correct exposure time even when an exposure time is decided by operating an operation member, by recording an exposure time measured by a measuring means on a magnetic recording means as a shutter second time, when a second exposure mode is selected. SOLUTION: In shutter control except a bulb photographing mode, the diaphragm 31 value and the shutter speed of a shutter 4 are decided from an exposure value detected by a light measuring circuit and sensitivity of a film 5. When a photographing mode is bulb photographing, the record of a shutter second time is corrected so as to be settled in the range from the upper limit value to the lower limit value of a shutter second time capable of being recorded. In this way, for recording the shutter second time, the set value of the shutter second time or the computed value obtained from a light measured value is recorded in the case except bulb photographing, and in the case of bulb photographing, an actually measured exposure time is recorded, and hence the correct shutter second time can be recorded even in either photographing mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera capable of magnetic recording on a film having a magnetic recording section.

[0002]

2. Description of the Related Art Conventionally, a camera has been disclosed in which an ideal exposure value is calculated from subject brightness and film sensitivity, and the calculated aperture value and shutter speed are recorded in a magnetic recording section provided on the film.

There is also disclosed a camera that calculates an ideal exposure value and, if the ideal exposure value is not within the exposure interlocking range of the camera, records the information in a magnetic recording section provided on the film.

Further, it is disclosed that data indicating a difference between an ideal exposure value and an actual exposure value at the time of photographing is written in a magnetic recording portion provided on a film and the data is used for correction at the time of printing. Has been done.

[0005]

However, in a magnetically recordable camera as in the above-mentioned conventional example, in bulb photography, the actual exposure time is the operation of the operation member by the photographer (from pressing the release button to releasing it). However, there is a problem that the actual exposure time cannot be recorded correctly.

(Object of the Invention) A first object of the present invention is to provide a magnetically recordable camera capable of recording an accurate exposure time even when the exposure time is determined by operating an operating member. Is.

A second object of the present invention is to provide a magnetically recordable camera capable of preventing the problem that shutter speeds outside a predetermined range are recorded.

[0008]

In order to achieve the first object, the present invention according to claims 1 to 7 is a magnetic recording means for recording information on a magnetic recording portion provided on a film, A first exposure mode for determining an exposure time according to a shutter time obtained based on the output of the photometric device or a preset shutter time, and exposure by a first operation of the operating member. In a magnetically recordable camera having a second exposure mode in which exposure is started by the second operation of the operation member, and the exposure time is measured when the second exposure mode is selected. When the measuring means and the first exposure mode are selected,
When the second exposure mode is selected with the shutter time obtained based on the output of the photometric means or the shutter time set in advance as the shutter time, it is measured by the measuring means. When the shutter time is used as the exposure time, a shutter time recording control means for recording the magnetic recording means is provided, and when the second exposure mode such as a valve is selected, the exposure at the time of photographing in the exposure mode is performed. The exposure time measured by the measuring means for measuring the time is recorded as the shutter time in the magnetic recording portion of the film.

Further, in order to achieve the second object,
According to a third aspect of the present invention, in the second exposure mode, when the exposure time measured by the measuring means is faster than the first threshold value, the first threshold value is set. Is recorded as the shutter time, and for example, when the exposure time during the bulb photographing is extremely long, the first threshold value is recorded as the shutter time in the magnetic recording portion of the film.

[0010] Similarly, in order to achieve the second object,
According to a fourth aspect of the present invention, in the second exposure mode, when the exposure time measured by the measuring means is lower than the second threshold, the second threshold is set. Is recorded as the shutter time, and for example, when the exposure time during the bulb photographing is extremely short, the second threshold value is recorded as the shutter time in the magnetic recording portion of the film.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is a configuration diagram showing a main part according to an embodiment when the present invention is applied to a single-lens reflex camera, and FIGS. 2A and 2B are top views of the single-lens reflex camera in FIG. 3 is a view showing a rear surface thereof and FIG. 3 is a view showing an inside of a viewfinder of the single lens reflex camera shown in FIG.

In these figures, reference numeral 1 denotes a taking lens, which is shown as two lenses for convenience, but in reality it is composed of more lenses. Reference numeral 2 denotes a main mirror which is inclined to the photographing optical path or retreated depending on the state of observation of the subject by the finder system and the state of photographing the subject image. Reference numeral 3 denotes a sub-mirror which reflects a light beam transmitted through the main mirror 2 toward a later-described focus detection device 6 below the camera body. Reference numeral 4 denotes a shutter, and reference numeral 5 denotes a film having a magnetic recording unit.

Reference numeral 6 denotes a focus detection device, which is a field lens 6a and reflection mirrors 6b, 6 arranged near the image plane.
c, a secondary imaging lens 6d, an aperture 6e, a sensor 6f, and the like. Focus detection device 6 in the present embodiment
Uses a well-known phase difference method, and as shown in FIG.
A plurality of areas (three places) in the observation screen (in the viewfinder field) are set as focus detection areas (hereinafter, referred to as distance measurement points), and the focus points can be detected.

Reference numeral 7 is a focusing plate arranged on the planned image forming surface of the taking lens 1, and 8 is a pentaprism for changing the finder optical path. Reference numerals 9 and 10 denote an imaging lens and a photometric sensor for measuring the brightness of the subject in the observation screen, respectively. The imaging lens 9 conjugates the focus plate 7 and the photometric sensor 10 via a reflection optical path in the pentaprism 8. Is related to

Reference numeral 11 denotes an eyepiece lens disposed behind the exit surface of the pentaprism 8 and used for observing the focusing plate 7 by the eye 15 of the photographer. 21 is a high-brightness superimpose LED that can be visually recognized even in bright subjects.
The emitted light is reflected by the main mirror 2 through the light projecting prism 22 and is bent in the vertical direction by the micro prism array 7a provided on the display unit of the focus plate 7, so that the penta prism 8 and the eyepiece 11 are moved. And reaches the photographer's eye 15.
Therefore, the micro prism array 7a is formed in a frame shape at a plurality of positions (distance measuring points) corresponding to the focus detection area of the focus plate 7, and three superimposing LEDs 21 (each of which is an LED) are respectively formed. -L, LED-C, LED
-R). As a result, as can be seen from the finder field shown in FIG. 3, each of the distance measurement point marks 200, 201, and 202 shines in the finder field, and the focus detection area (distance measurement point) can be displayed. (Hereinafter, this is called superimposed display).

Reference numeral 23 is a visual field mask for forming a finder visual field area. Reference numeral 24 denotes a finder LCD for displaying photographing information outside the finder field of view.
-LED) 25. This LCD2
The light transmitted through 4 is guided into the finder visual field by the triangular prism 26 and is displayed outside the finder visual field as indicated by 207 in FIG. 3 so that the photographer can know the photographing information. Reference numeral 31 denotes an aperture provided in the photographing lens 1; 32, an aperture driving device including an aperture driving circuit 111 described later;
Is a lens driving motor, 34 is a lens driving member composed of a driving gear and the like, 35 is a photocoupler and is a lens driving member 34.
The rotation of the pulse plate 36 that is linked to the rotation of the lens is detected and transmitted to the lens focus adjustment circuit 110. The focus adjustment circuit 110 drives the lens driving motor by a predetermined amount based on this information and the information on the lens driving amount from the camera side, and moves the photographing lens 1 to a focusing position. Reference numeral 37 denotes a mounting contact that serves as an interface between a known camera and a lens.

In FIG. 2, reference numeral 41 is a release button.
Reference numeral 42 denotes a monitor LCD as an external monitor display device, which comprises a fixed segment display section 42a for displaying a predetermined pattern and a 7-segment display section 42b for displaying a variable numerical value. 43 is the lock A for the photometric value
The E lock button, 44 is used to select a shooting mode or the like with the mode dial.

The other operating members are omitted because they are not particularly necessary for understanding the present invention.

FIGS. 4A and 4B are detailed views of the mode dial 44 shown in FIG. 2, in which the display is aligned with the visual target 55 engraved on the camera body so that the image is taken with the displayed contents. The mode is set.

In FIG. 4A, 44a is a lock position for disabling the camera, 44b is a position in an automatic photographing mode controlled by a photographing program preset by the camera, and 44c is a photographer who can set photographing contents. The manual shooting mode has program AE, shutter priority AE, aperture priority AE, subject depth priority AE, manual exposure, and bulb shooting modes.

FIG. 4B shows the internal structure of the mode dial 44, and 46 is a flexible printed circuit board, showing switch patterns (M1, M2, M3, M4) as a mode dial switch and a GND pattern. The four contact pieces (47) of the switch contact piece 47 which are arranged as described above and are interlocked with the rotation of the mode dial 44.
By sliding (a, 47b, 47c, 47d), the 12 positions shown on the mode dial 44 can be set by 4 bits.

Reference numeral 45 is an electronic dial for rotating and generating a click pulse to select a set value that can be further selected from the modes selected by the mode dial 44.

For example, when the shutter priority photographing mode is set by the mode dial 44, the LCD 2 in the finder is displayed.
4 and the monitor LCD 42 display the currently set shutter speed. When the photographer rotates the electronic dial 45, the shutter speed is sequentially changed from the currently set shutter speed according to the rotating direction.

FIGS. 5A and 5B show the electronic dial 4
5 is a schematic diagram showing the internal structure of FIG.

In the figure, a click plate 48 is arranged along with the dial 45, and a printed board 49 is fixed to the click plate 48. The printed circuit board 49 has switch patterns 49a (SWDIAL-1) and 49b (SWDIAL-1).
AL-2) and the GND pattern 49c are arranged as shown in the figure, and the switch contact piece 50 having three sliding contact pieces 50a, 50b, 50c is fixed to the fixing member 51. Recessed portion 48 formed on the outer peripheral portion of the click plate 48
A click ball 52 that fits in a is arranged, and a coil spring 53 that biases the ball is held by the fixing member 51. Further, in the normal position (the state where the click ball 52 fits in the recess 48a), the sliding contact pieces 50a, 50b are not in contact with either of the switch patterns 49a, 49b.

The electronic dial 4 formed in this way
5, when the photographer rotates the electronic dial 45 in the clockwise direction in FIG. 5, the sliding contact piece 50b first contacts the switch pattern 49b, and then the sliding contact piece 5b.
0a is in contact with the switch pattern 49a,
Count up at this timing. In the case of rotation in the counterclockwise direction, the relationship between the sliding contact piece and the switch pattern is just opposite, and at the same timing, the set value is counted down.

FIG. 5B is a timing chart showing this state, showing the pulse signals generated in the switch patterns 49a and 49b when the electronic dial 45 is rotated, and the timing thereof. The upper diagram is 1 clockwise
The case of clicking rotation shows the case of rotating counterclockwise in the lower figure, and the timing of counting up and down and the direction of rotation are detected in this way.

FIG. 6 is a block diagram showing the electrical construction incorporated in the camera of the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals.

A central processing unit (hereinafter referred to as a CPU) 100 in a microcomputer incorporated in the camera body.
Includes a photometry circuit 102, an automatic focus detection circuit 103, a signal input circuit 104, an LCD drive circuit 105, an LED drive circuit 106, a shutter control circuit 107, and a motor control circuit 1.
08, a magnetic recording circuit 109, a film detection circuit 111,
The clock circuit 113 is connected. Further, a focus adjustment circuit 115 and an aperture driving circuit 116 disposed in the taking lens
Means that a signal is transmitted through the mount contact 37 shown in FIG.

The photometric circuit 102 amplifies the output from the photometric sensor 10, performs logarithmic compression and A / D conversion, and sends it to the CPU 100 as luminance information of each sensor. The photometric sensor 10 has an SPC-A0 for measuring the area A0 including the left ranging point 200 in the finder visual field shown in FIG. 3 and an SPC-A for measuring the area A1 including the central ranging point 201 in the finder visual field. A1, SPC-A2 for measuring the area A2 including the right distance measuring point 202 in the finder visual field, SPC-A3 for measuring the area A3, and S for measuring the area A4.
PC-A4 and SPC-photometering other area A5
A5 consists of six photodiodes.

As shown in FIG. 3, the line sensor 6f of FIG. 6 has three sets of line sensors CCD-L, CCD-C and CC corresponding to the three distance measuring points 200 to 202 on the screen.
It is a known CCD line sensor composed of DR. The automatic focus detection circuit 103 A / D converts the voltage obtained from the line sensor 6f and sends the voltage to the CPU 100. The signal input circuit 104 is for inputting a state of an operation member or the like of the camera.
The switch connected to is described below.

SW1 is a switch that is turned on by the first stroke of the release button 41 to start photometry, AF (autofocus), etc., and SW2 is a release switch that is turned on by the second stroke of the release button. SW-DIAL
1 and SW-DIAL 2 are the electronic dial 4 already described.
5 is a dial switch provided in the signal input circuit 1
The number of rotation clicks of the electronic dial 45 is input to the up / down counter 04. SW-M1
M4 is also a dial switch provided in the mode dial 44 already described. The signals of these switches are input to the signal input circuit 104, and the CPU 10 is connected via the data bus.
Sent to 0.

The LCD driving circuit 105 is a known circuit for driving the liquid crystal display device LCD to display, and a CPU
In accordance with the signal from 100, the display of the aperture value, the shutter time, the set photographing mode, and the like can be simultaneously displayed on both the monitor LCD 42 and the finder LCD 42. Further, the LCD drive circuit 105 includes a circuit for driving a sounding body (not shown), and in accordance with a signal from the CPU 100, a focus sound at the time of focusing, a warning sound when the release operation according to the present invention is prohibited, and the like. Sounds.

The LED drive circuit 106 is an LED for illumination.
(F-LED) 25 and LED 21 for superimpose
Is turned on and off. The shutter control circuit 107
Controls the magnet MG1 for running the front curtain and the magnet MG2 for running the rear curtain when energized,
Is exposed to a predetermined amount of light. The motor control circuit 108
Is a motor M1 for winding and rewinding the film 5.
And a motor M2 for charging the main mirror 2 and the shutter 4. The magnetic recording circuit 109 controls a magnetic head 110 for writing shooting information on the film 5.

The film detection circuit 111 is for detecting the feeding speed of the film 5 and the position of the film during the film feeding from the signal from the photo sensor 112, and the photo sensor 112 during the film feeding. When a predetermined signal is output from the photosensor 11, it can be detected that the film has been fed to the magnetic recording portion provided on the film 5, and the photosensor 11
When a predetermined signal is output from 2, the completion of feeding of one frame can be detected.

The shutter control circuit 107, motor control circuit 108, magnetic recording circuit 109, film detection circuit 1
A series of release sequences is operated by 11 or the like.

The clock circuit 113 displays the year, month,
The clock circuit 113 is used to record information such as date, hour, minute, and second in the magnetic recording unit. The clock circuit 113 is read by a signal from the CPU 100.
It is corrected according to the signal from.

7A and 7B show the monitor LC.
D42 and the contents of all display segments of the LCD 24 in the finder.

In FIG. 7A, the fixed display segment portion 42a is provided with a known photographing mode display and the like. The fixed display segment section 42a also includes an indication of the presence or absence of a film. 7-segment part 4 for variable numerical value display
2b is a 4-digit 7-segment 6 indicating the shutter time.
2. It is composed of a 2-digit 7-segment 63 for displaying the aperture value, a decimal point 64, a limited numerical value display segment 65 for displaying the number of films, and a 1-digit 7-segment 66.

In FIG. 7B, 72 is an AE lock mark, 73, 74, and 75 are the same display segments as the shutter time display and the aperture value display, 76 is an exposure correction setting mark, and 77 is the strobe fullness. A mark 79 is a focus mark indicating the focus state of the taking lens.

FIG. 8 shows the shape of the film 5 having a magnetic recording portion.

Reference numerals 150 and 151 denote perforation holes, and when the film is fed, the feeding state is confirmed by recognizing the holes with a photo reflector. Fifteen
Reference numerals 2 and 153 denote photoreflectors (corresponding to 112 in FIG. 6), and two photoreflectors are used in this embodiment. Reference numeral 154 denotes a magnetically recordable portion (magnetic recording portion) for printing the magnetic information recorded here and utilizing it at the time of development. Fifteen
5 is the actual photosensitive member of the film.

Next, a flow chart of the operation of the magnetically recordable camera is shown in FIGS. 9 to 10 and will be described below based on these.

When the battery is inserted into the camera, the power of the camera is turned on and the CPU 100 starts the operation from step # 101 through step # 100. [Step # 101] Flags required for camera control,
Initialize variables and so on. [Step # 102] Information on the operating member is input from the signal input circuit 104. The information of the operation member to be input includes, for example, the state of the switch SW1 which is turned on by the first stroke of the release button 41, the switch SW2 which is turned on by the second stroke of the release button 41, and the mode dial 44.
It also detects changes in the switch SW1 and the like. [Step # 103] The shooting mode of the camera is set according to the position of the mode dial 44. [Step # 104] It is determined whether or not the release button 41 is pressed to the second stroke and the switch SW2 is turned on. If the switch SW2 is turned off, step # 104
Proceed to 105. [Step # 105] Here, it is determined whether or not the release button 41 is pressed to the first stroke and the switch SW1 is turned on. If the switch SW1 is turned off, the process returns to step # 102.

Step # 104 or Step #
In 105, when the switch SW2 or SW1 is turned on, the process proceeds to step # 106. [Step # 106] Here, the subroutine "photometry" is performed.
Call. This subroutine "photometry" obtains photometric values from the brightness of a plurality of areas within the shooting range, and calculates the aperture value at shutter speed from the photometric values BV and film sensitivity.
The details of this subroutine "photometry" will be described later. [Step # 107] In step # 102 described above, the change of the switch SW1 is also detected. If the change of the state of the switch SW1 from off to on is detected in step # 102, step # 108 is performed.
Proceed to. [Step # 108] If the switch SW1 is turned on from off, the first focus detection operation is performed.
Before starting the distance measuring operation, flags related to distance measuring are initialized. At this time, the flag JF indicating the focused state is also cleared.

When the operation in step # 108 is completed or the state of the switch SW1 is not changed in step # 107, step # 10 shown in FIG.
Go to 9. [Step # 109] In order to detect the focus state of a plurality of focus detection points, the subroutine "focus detection" is called.
By calling this subroutine "focus detection", the defocus amount of each distance measuring point is obtained. [Step # 110] Calls the subroutine "distance measuring point selection". In this subroutine "focus detection point selection", the main subject is estimated based on the defocus amounts of the plurality of focus detection points obtained by the subroutine "focus detection" executed in step # 109, and the focus detection point is determined. Is performed. The defocus amount of the focus detection point obtained by this subroutine "selection of focus detection point" becomes the defocus amount actually used for lens control. [Step # 111] Here, in order to perform focus determination,
The current focus state is determined based on the defocus amount of the focus detection point obtained by the subroutine "selection of focus detection point" executed in step # 110. In this step, it is determined whether or not the flag JF indicating whether or not the focus is set, whether or not the focus is within the focus range, and whether or not distance measurement is impossible. This judgment result is
It is used for control and display for driving the lens. [Step # 112] Here, when it is impossible to measure the distance, a determination is made to perform the display indicating that the distance cannot be measured. If distance measurement is possible, the process proceeds to step # 113. [Step # 113] If the focus state of the focus detection point selected in step # 110 is in focus (flag JF
= 1), the process proceeds to step # 114 to display the in-focus state. [Step # 114] The CPU 100 sends a signal to the LCD drive circuit 105 to turn on the focusing mark 79 of the in-viewfinder LCD 24 to notify the photographer that focusing has been achieved. Further, the CPU 100 sends a signal to the LCD drive circuit 105 to emit a focusing sound. [Step # 115] Here, the focus detection point when the focus is achieved is displayed. When the focus is achieved, the focus detection points are displayed for a certain period of time when the focus is achieved.
It is displayed by a method of turning on any of 02. For this reason,
The CPU 100 sends a signal to the LED drive circuit to turn on the superimposing LEDs corresponding to the selected focus detection points.
Turn on for ms.

If the distance measurement is impossible in step # 112, step # 116 is executed to display the distance measurement impossible.
Proceed to. [Step # 116] The CPU 100 sends a signal to the LED drive circuit 105 to blink the focus mark 79 on the in-viewfinder LCD 24 to notify the photographer that distance measurement is impossible.

In step # 113, if the focus state of the focus detection point selected in step # 110 is not in focus (flag JF = 0), the process proceeds to step # 117 to drive the lens. . [Step # 117] The CPU 100 sends a signal to the lens focus adjustment circuit 110 to drive the taking lens 1 by a predetermined amount.

Steps # 114 and # 116 above
Alternatively, after the operation of step # 117 is completed, the process proceeds to step # 118 in any case, and the following step # 120 is performed.
Until then, the determination for shifting to the release operation is performed. [Step # 118] Here, when it is not in focus (flag JF = 0), it is determined that the release operation cannot be shifted to even if the release button 41 is pressed.
When in focus (flag JF = 1), the process proceeds to step # 119 so as to determine whether the release button 41 is pressed. When not in focus (flag JF = 0), step # 102 in FIG. Return to. [Step # 119] If the release button 41 is pressed and the switch SW1 is turned on, the process proceeds to step # 120, and if the switch SW1 is turned off, the process returns to step # 102 in FIG. [Step # 120] If the release button 41 is pressed and the switch SW2 is turned on, the process proceeds to step # 121, and if the switch SW2 is turned off, the process returns to step # 102 in FIG. [Step # 121] Here, in order to perform the release operation, the process jumps to the release sequence shown in FIG.

Next, flowcharts of the release sequence are shown in FIGS. 11 to 13 and will be described below based on these. [Step # 200] Release control is started. [Step # 201] As a preparation for exposing the film 5 to light, first, the main mirror 2 is raised. Therefore, the CPU 100 sends a signal to the motor control circuit 109 to start driving the motor M2 in the forward direction. [Step # 202] Phase signal C of a phase substrate (not shown)
Continue monitoring MSP1 and CMSP2, and wait until the phase signal reaches the mirror-up position. [Step # 203] Since the mirror-up position has been reached, a signal is sent to the motor control circuit 109 to stop driving the motor M2. [Step # 204] A signal is sent to the diaphragm driving device 32 including the diaphragm driving circuit 11 to narrow down the diaphragm 31 by a predetermined amount. [Step # 205] Wait until the aperture 31 has been narrowed down by a predetermined amount. [Step # 206] Prior to shutter control, it is determined whether the shooting mode is bulb shooting. If it is the bulb photographing mode, the process proceeds to step # 207. [Step # 207] The subroutine "valve control" is called. In this subroutine "valve control", bulb exposure is controlled. Details of the subroutine “valve control” will be described later.

If it is determined in step # 206 that the mode is not the bulb photographing mode, the process proceeds to step # 208. [Step # 208] Here, shutter control is performed in a mode other than the bulb photographing mode. Specifically, first, a signal is sent to the shutter control circuit 108, the MG 1 is energized, and the front curtain of the shutter 4 is opened. The aperture value of the diaphragm 31 and the shutter speed of the shutter 4 are determined from the exposure value detected by the photometric circuit 102 and the sensitivity of the film 5. After a lapse of a predetermined shutter time, a signal is sent to the shutter control circuit 108, the MG 2 is energized, and the rear curtain of the shutter 4 is closed. This completes the exposure of the film 5.

When the operation in step # 207 or # 208 is completed, the process proceeds to step # 209 shown in FIG. [Step # 209] When exposure of the film 5 is completed, the aperture is returned to the open state, the main mirror 2 is moved down and the shutter is charged, and then the film 5 is wound up. For this purpose, first in step # 209, a signal is sent to the diaphragm driving device 32 including the diaphragm driving circuit 111,
The driving of the diaphragm 31 is started. This is done to return to full aperture. [Step # 210] Wait until the aperture 31 returns to the open state. [Step # 211] In order to move down the main mirror 2 and charge the shutter, the CPU 100 sends a signal to the motor control circuit 109 to start driving the motor M2 in the forward direction. [Step # 212] Phase signal C of the phase substrate (not shown)
Continue monitoring MSP1 and CMSP2, and wait until the phase signal reaches the shutter charge completion position. [Step # 213] Since the shutter charge completion position has been reached, a signal is sent to the motor control circuit 109 to stop driving the motor M2. [Step # 214] Here, a signal is sent to the motor control circuit to wind the film 5, and the motor M1
To drive in the forward direction. Further, a signal is sent to the film detection circuit 111 so that a signal from the photo sensor 112 can detect a film position during film feeding. [Step # 215] The signal from the photo sensor 112 is continuously monitored, and the process stands by until the film position during film feeding becomes the magnetic recording portion. [Step # 216] The position during film feeding is shown in FIG.
Since the position of the magnetic recording portion 154 shown in (4) is reached, magnetic recording is started. Regarding magnetic recording, the format, order, etc. of the data to be recorded are predetermined. For this reason,
In this step, the process before the recording at the shutter speed, which is performed in the following steps # 217 to # 223, is performed.

Steps # 217 to # 223 shown in FIG. 13 below are portions for recording at shutter speed. [Step # 217] Here, it is determined whether or not the shooting mode is bulb shooting. If the shooting mode is not bulb shooting, the process proceeds to step # 218. [Step # 218] Since the photography mode is not bulb photography here, shutter time recording other than bulb photography is performed. The shutter time recorded in this step is the shutter time obtained in step # 106. When the shooting mode is manual or shutter-priority AE, the set value is set, and in other cases, the calculated value is obtained from the photometric value and the film sensitivity.

In step # 217, if the shooting mode is bulb shooting, the process proceeds to step # 219.

Hereinafter, step # 219 to step # 22
Reference numeral 3 is a portion for performing recording at the shutter speed when the shooting mode is bulb shooting. When recording the shutter speed,
The upper limit value (high speed second side) and the lower limit value (low speed second side) of the shutter speed that can be recorded are determined in advance. Therefore, the following steps # 219 to # 223
This is for correcting the shutter speed BULB_TV (bulb exposure time at the time of bulb shooting, which is converted to the shutter speed) at the time of bulb shooting within the range of the upper limit value and the lower limit value. [Step # 219] Here, the shutter speed BULB_TV (bulb exposure time at the time of bulb shooting is converted to the shutter speed) at the time of bulb shooting is the threshold value LVL1 on the low speed side.
It is determined whether or not the time is longer, and if the time is longer than the threshold value LVL1 on the low speed side, step # 220.
Proceed to. [Step # 220] Here, the threshold value LV on the low speed side
Record L1 as shutter time.

In step # 219, if the shutter speed BULB_TV at the time of bulb photographing is not longer than the low speed side threshold value LVL1, the process proceeds to step # 221 below. [Step # 221] Shutter time B during bulb shooting B
It is determined whether or not ULB_TV (exposure time at the time of bulb photographing converted to shutter seconds) is higher than the threshold LVL2 on the high speed side, and the threshold LVL on the high speed side is determined.
If the speed is higher than 2, the process proceeds to step # 222. [Step # 222] Here, the threshold value LV on the high speed side
Record L2 as shutter time.

If it is determined in step # 221 that the shutter speed BULB_TV at the time of bulb photographing is not higher than the high speed side threshold value LVL2, the process proceeds to step # 223. [Step # 223] Here, the shutter speed BULB_TV (the exposure time at the time of bulb shooting is converted to the shutter time) at the time of bulb photographing is recorded as it is as the shutter time.

Steps # 220 and # 222 above
Alternatively, in step # 223, after the recording at the shutter speed is completed, the process proceeds to step # 224 below. [Step # 224] Here, the remaining data such as the date is recorded based on the information of the clock circuit 13. [Step # 225] The signal from the photo sensor 112 is continuously monitored, and the process waits until the film position during film feeding reaches the position where feeding of one frame is completed. [Step # 226] Since the film feeding for one frame is completed, a signal is sent to the motor control circuit to stop the motor M1.

When the above release operation is completed, FIG.
Return to step # 102.

Next, in the subroutine "valve control" executed in step # 207 of FIG.
The following is a description based on the flowchart of FIG.

This subroutine "bulb control" is exposure control when the photographing mode is bulb photographing. The measuring means of the present invention is included in this subroutine. In the first embodiment of the present invention, the measuring means is made to function only during bulb photographing. [Step # 300] When the subroutine “valve control” is called, the following control is performed from step # 301. [Step # 301] The operation here is part of the measuring means of the present invention. The current time T1 is input from the clock circuit 113. This time T1 is the time when the exposure starts. [Step # 302] A signal is sent to the shutter control circuit 108 to energize the MG1 to open the front curtain of the shutter 4. [Step # 303] Wait until the finger is released from the release button 41 and both the switches SW1 and SW2 are turned off. [Step # 304] A signal is sent to the shutter control circuit 108 to energize the MG2 to close the rear curtain of the shutter 4.
At this point, the exposure of the film 5 is completed. [Step # 305] The operation here is also a part of the measuring means of the present invention. The current time T2 is input from the clock circuit 113. This time T2 is the time when the exposure ends. [Step # 306] The operation here is also a part of the measuring means of the present invention. The exposure time T at the time of bulb exposure is obtained.
The exposure time T at the time of bulb photography is obtained by the difference (T = T2-T1) between the time T2 at the end of exposure and the time T1 at the start of exposure. [Step # 307] The operation here is also a part of the measuring means of the present invention. The exposure time T at the time of bulb photography is converted into BULB_TV at shutter speed. [Step # 308] The subroutine "valve control" is terminated and the process returns.

The operation of the camera has been described above with reference to the flowchart and the like.

Next, the subroutine "focus detection" executed in step # 109 of FIG. 10 will be described with reference to FIG.
A description will be given below based on the flowchart of FIG. This subroutine "focus detection" performs processing such as sensor accumulation operation, image signal reading, and defocus amount calculation. [Step # 400] When the subroutine "focus detection" is called, the following control is executed from step # 401. [Step # 401] Here, when the focus is already achieved, it is a determination for not performing focus detection thereafter. It is determined whether or not it is already in focus, and if it is already in focus (flag JF = 1), step # 407.
If not in focus (flag JF = 0), the process proceeds to step # 402. [Step # 402] Since the main subject is estimated from the focus detection points 200 to 202 and the camera automatically selects the focus detection points, it is necessary to calculate all the focus detection points.
Therefore, all the distance measuring points are set as the calculation distance measuring points. The calculation distance measuring point is a distance measuring point for controlling the accumulation of the sensor, reading the image signal, and calculating the defocus amount. [Step # 403] The accumulation operation of the sensor is started.
The accumulation operation is started for all the sensors corresponding to all the distance measuring points, regardless of the calculated distance measuring points. [Step # 404] Wait until all the sensors corresponding to the above calculation distance measuring points have completed the accumulation operation. [Step # 405] When the accumulation operation of all the sensors at the calculation distance measuring point is completed, the reading operation of the sensor corresponding to the calculation distance measuring point is performed. [Step # 406] When the reading operation of all the sensors at the calculated focus detection point is completed, the defocus amount at the calculated focus detection point is calculated. In this step, it is also determined whether or not each distance measuring point cannot be measured. [Step # 407] The subroutine "focus detection" is completed and the process returns.

Next, the subroutine "selecting distance measuring points" executed in step # 110 of FIG. 10 will be described with reference to FIG.
The following is a description based on the flowchart of No. 6. This subroutine "focus detection point selection" performs processing for estimating the main subject based on the defocus amount of each focus detection point and selecting that focus detection point. [Step # 500] When the subroutine "select distance measuring point" is called, the following control is executed from step # 501. [Step # 501] First, it is determined whether or not there is a distance measuring point that can be measured out of the three distance measuring points. If there is no distance measuring point that can be measured, the process proceeds to step # 502 and distance measuring is possible. If there is a distance measuring point, the process proceeds to step # 503. [Step # 502] The central focus detection point is set as the selected focus detection point. [Step # 503] If there is a distance measuring point that can be measured,
The distance measuring point closest to the distance measuring points that can be measured is the selected distance measuring point. [Step # 504] The subroutine "distance measuring point selection" is ended and the process returns.

Next, the subroutine "photometry" executed in step # 106 of FIG. 9 will be described below with reference to the flowchart of FIG. This subroutine "photometry" uses the photometric sensor 10 and the photometric circuit 102 to measure the brightness of each region within the shooting range, obtains a photometric value based on this, and calculates the aperture value at the shutter speed. [Step # 600] When the subroutine “photometry” is called, the following control is executed from step # 601. [Step # 601] First, the brightness information of each area within the shooting range is obtained from the photometric circuit 102. The brightness of area A0 is B
VA0, the brightness of the area A1 is BVA1, the brightness of the area A2 is BVA2, the brightness of the area A3 is BVA3, the brightness of the area A4 is BVA4, and the brightness of the area A5 is BVA5. [Step # 602] The average value of the luminance of each area within the shooting range is obtained and set as the photometric value BV. The photometric value BV is calculated by the following formula.

BV = (BVA0 + BVA1 + BVA2 + BVA3 + BVA4 + BVA5) / 6 [Step # 603] Exposure calculation is performed based on the photometric value BV. The aperture value AV and the shutter speed TV are calculated from the photometric value BV and the film sensitivity. When the shooting mode is manual, the setting value is set for the shutter speed and the aperture value is set value. [Step # 604] The subroutine "photometry" is completed and the process returns.

According to the above-described embodiment, in the recording at the shutter speed, the setting value at the shutter speed other than the bulb photographing or the calculated value obtained from the photometric value is recorded in the magnetic recording portion provided on the film. However, since the actually measured exposure time is recorded at the time of bulb photographing, it is possible to record the accurate shutter time in any photographing mode.

Further, even if the exposure time during bulb photography is extremely short or extremely long, a value within the recordable shutter speed range is written, so it is possible to prevent writing an incorrect value. More specifically, although the writing range (information amount) of information to the magnetic recording portion of the film is fixed, for example, when writing information for a long time that does not fit within this range, the upper bit or the lower bit The information is deleted, and as a result, the exposure time is far from the actual exposure time. However, by doing as described above, such an inconvenience can be prevented.

(Modification) In the present invention, the bulb photographing is set by the mode dial provided in the camera, but it is of course possible to set it by remote control. Even in such a case, the present invention is also applied. Needless to say, is effective.

The present invention is also applicable to cameras other than single-lens reflex cameras, for example, silver halide cameras.

[0072]

As described above, according to the present invention,
For example, in bulb photography, since the measurement value of the measuring means that measures the exposure time in the photography, that is, the exposure time is recorded as the shutter speed in the magnetic recording portion of the film, the operation member is operated. Even when the exposure time is determined, the accurate exposure time can be recorded in the magnetic recording portion of the film.

Further, according to the present invention, for example, in bulb photography, when the measurement value of the measuring means for measuring the exposure time in the photography, that is, the exposure time is faster than the first threshold value, Alternatively, when the speed is slower than the second threshold value, the first threshold value or the second threshold value is recorded as the shutter speed in the magnetic recording portion of the film. Therefore, it is possible to prevent a problem that the shutter speed outside the predetermined range is recorded in the magnetic recording portion of the film.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a main part according to a first embodiment when the present invention is applied to a single-lens reflex camera.

FIG. 2 is a diagram showing an upper surface and a rear surface of the single-lens reflex camera of FIG. 1;

FIG. 3 is a diagram showing the inside of a viewfinder field of the single-lens reflex camera of FIG. 1;

FIG. 4 is a diagram for explaining the structure of the mode dial shown in FIG.

FIG. 5 is a diagram for explaining the structure of the electronic dial shown in FIG.

FIG. 6 is a block diagram showing an electrical configuration of the single-lens reflex camera of FIG. 1;

7 is a monitor LCD and finder L shown in FIG.
It is a figure for explaining CD.

8 is a diagram showing a film having a magnetic recording unit used in the single-lens reflex camera in FIG.

9 is a flowchart showing a part of the operation of the single-lens reflex camera in FIG.

FIG. 10 is a flowchart showing a continuation of the operation shown in FIG. 9;

11 is a flowchart showing a part of a release operation of the single-lens reflex camera in FIG.

FIG. 12 is a flowchart showing an operation following that of FIG.

FIG. 13 is a flowchart showing a continuation of the operation shown in FIG.

FIG. 14 is a flowchart showing an operation during “valve control” executed in step # 207 of FIG.

15 is a flowchart showing an operation at the time of "focus detection" executed in step # 109 of FIG.

16 is a flowchart showing an operation at the time of "selecting a distance measuring point" executed in step # 110 of FIG.

FIG. 17 is a flowchart showing an operation at the time of “photometry” executed in step # 106 of FIG.

[Explanation of symbols]

 44 Mode Dial 45 Electronic Dial 100 CPU 102 Photometric Circuit 109 Magnetic Recording Circuit 110 Magnetic Head 111 Film Detection Circuit 112 Photo Sensor

Claims (7)

[Claims] 1. A magnetic recording unit for recording information on a magnetic recording unit provided on a film, and a photometric unit, wherein a shutter time obtained based on an output of the photometric unit or a preset shutter is provided. A magnetic recording having a first exposure mode in which the exposure time is determined according to time, and a second exposure mode in which the exposure is started by the first operation of the operation member and the exposure is ended by the second operation of the operation member. In a possible camera, the measuring means for measuring the exposure time when the second exposure mode is selected, and, if the first exposure mode is selected, based on the output of the photometric means If the second exposure mode is selected, the obtained shutter time or a preset shutter time is set as the shutter time, and the exposure time measured by the measuring unit is set as the shutter time. Magnetic recordable camera characterized by comprising a shutter time recording control means for recording the recording unit. 2. The magnetically recordable camera according to claim 1, wherein the second exposure mode is a bulb mode. 3. The shutter time recording control means, in the second exposure mode, when the exposure time measured by the measuring means is faster than the first threshold value. 3. The magnetically recordable camera according to claim 1, wherein the first threshold value is recorded as a shutter speed. 4. The shutter time recording control means, when the exposure time measured by the measuring means is lower than the second threshold value in the second exposure mode, The magnetically recordable camera according to claim 1 or 2, wherein the second threshold value is recorded as a shutter speed. 5. The shutter time recording control means records a signal according to the shutter time value within a predetermined range of a magnetic recording portion provided for each frame of the film, 5. The camera according to claim 3, wherein the first threshold value and the second threshold value correspond to a limit value of a signal amount that can be recorded in the predetermined range. 6. The exposure means in the second exposure mode has a clock circuit for clocking time information, and based on an exposure start time and an exposure end time clocked by the clock circuit. Claim 1, 2, characterized in that the time is obtained.
The camera described in 3, 4, or 5. 7. The camera according to claim 6, wherein the shutter time recording control means records the time information measured by the clock circuit in a range different from the range of the magnetic recording section. .