JP4474040B2 - Camera and camera system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a camera system such as a single-lens reflex camera that performs lens focusing by driving a stepping motor using a lens focusing switch.
[0002]
[Prior art]
Conventionally, when a lens aperture is driven by a stepping motor, energization of the stepping motor is maintained even after the aperture drive is performed. This is because if the stepping motor is turned off after the aperture driving, the aperture position cannot be maintained with high accuracy.
[0003]
Therefore, when the lens aperture is driven by the lens aperture switch, the stepping motor is kept energized.
[0004]
[Problems to be solved by the invention]
However, in actuality, the lens aperture switch is used for narrowing down because the photographer confirms the depth of field, and the accuracy of maintaining the power supply to the stepping motor is not required during the confirmation.
[0005]
Therefore, maintaining the energization of the stepping motor after the aperture driving by the lens aperture switch is a waste of current consumption.
[0006]
Further, in the conventional camera, there is a problem that the aperture position cannot be maintained with high accuracy if the power of the stepping motor is turned off after driving the lens aperture.
[0007]
Furthermore, when a release operation is performed during narrowing down in order to maintain narrowing accuracy, there is a problem that the time lag at the time of release increases if the diaphragm is opened once and narrowed down again.
[0008]
A first object of the present invention is to provide a camera system in which current consumption can be reduced by turning off energization of a stepping motor after aperture driving by a lens aperture switch.
[0009]
A second object of the present invention is to provide a camera system capable of performing exposure control by precise aperture driving.
[0010]
A third object of the present invention is to provide a camera system in which a release time lag occurs in a release being narrowed down and there is no fear of missing a photo opportunity.
[0011]
[Means for solving the problems]
The present invention The camera Driven by stepping motor Te Light intensity adjustment means to adjust the amount of light passing through the sensor Communication control with a photographic lens having turtle La Leave A narrowing switch; a release switch button having a first stroke and a second stroke; and a control unit that drives the light amount adjusting unit to narrow down by operating the narrowing switch. The control means is used to operate the narrowing switch. Depending on Via the stepping motor The Narrowing operation of the light quantity adjusting member The line Nanase After stepping down the light amount adjusting member, the stepping motor What Stop energizing And taking a picture after opening the light amount adjusting member once according to the second stroke of the release switch button in a state where the narrowing switch is operated and then narrowing the light amount adjusting member. It is characterized by that.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Hereinafter, a first embodiment according to the present invention will be described in detail with reference to FIGS.
[0020]
FIG. 1 is a block diagram showing a main part of an electrical configuration of a single-lens reflex camera provided with a lens aperture switch (hereinafter abbreviated as SW) according to the present embodiment.
[0021]
In FIG. 1, reference numeral 100 denotes a central processing unit (hereinafter referred to as MPU) of a microcomputer which is a camera control means built in the camera body, and a source oscillation circuit formed by an oscillation circuit 101 is a signal in the MPU 100. Thus, the operating frequency of the MPU 100 is determined by not dividing, dividing by 1/2, or dividing by 1/16. Reference numeral 100b denotes an EEPROM serving as a storage unit, which can store photographing information. Reference numeral 100c denotes an A / D converter, which performs A / D conversion on analog signals input from the focus detection circuit 103 and the multi-division photometric sensor 104, as will be described later.
[0022]
A liquid crystal display circuit 102, a focus detection circuit 103, a photometry circuit 104, a shutter control circuit 105, a motor control circuit 106, a film travel detection circuit 107, and a switch sense circuit 108 are connected to the MPU 100.
[0023]
Further, lens control information is transmitted to the lens control circuit 39 disposed in the photographing lens 1 via the mount contact 37 shown in FIG. Further, external flash information is transmitted to the external flash circuit 110 via an external flash contact 111.
[0024]
The liquid crystal driving circuit 102 controls the display of the LCD 15 in the finder, which is a liquid crystal panel for distance measuring point display within the finder field of view, and the LCD 20 in the finder outside the finder field of view, in accordance with signals from the MPU 100.
[0025]
The focus detection circuit 103 performs accumulation control and readout control of the focus detection area sensor 6f in accordance with the signal of the MPU 100, and outputs each pixel information to the MPU 100. The MPU 100 A / D converts this information, performs focus detection by a well-known phase difference detection method, sends the detected focus detection information to the lens control circuit 39, and adjusts the focus of the lens.
[0026]
The photometric circuit 104 outputs an output from the photometric sensor 10 to the MPU 100 as a luminance signal of each area in the screen. The MPU 100 A / D converts the luminance signal and adjusts the exposure for shooting.
[0027]
Further, the flash control of the present embodiment is a method in which pre-flash is performed before flash emission at the time of shooting and the flash emission amount at the time of shooting is determined, and the photometric sensor 10 also performs photometry at the time of pre-flash. .
[0028]
The shutter control circuit 105 performs exposure control by causing the shutter front curtain to travel via the magnet MG-1 and then causing the shutter rear curtain to travel via the magnet MG-2 in accordance with a signal from the MPU 100.
[0029]
The motor control circuit 106 controls the motor in accordance with a signal from the MPU 100, thereby performing up / down of the main mirror 2, charging of the shutter, and feeding of the film.
[0030]
The film running detection circuit 107 detects whether or not the film has been wound up by one frame when feeding the film, and sends a signal to the MPU 100.
[0031]
SW1 is turned on by a first stroke of a release button (not shown) and a switch for starting photometric and AF operations, and SW2 is turned on by a second stroke of a release button (not shown) to start an exposure operation. It is. The aperture SW is a switch that instantaneously drives the aperture of the lens. In addition, the switch sense circuit 108 detects the status signal of the operation member of the camera (not shown) and sends it to the MPU 100.
[0032]
FIG. 2 is a cross-sectional view showing the optical arrangement of the single-lens reflex camera of the present embodiment. The same components as those in FIG. 1 are denoted by the same reference numerals.
[0033]
In FIG. 2, reference numeral 1 denotes a photographing lens, which is shown by two lenses 1a and 1b for the sake of convenience, but actually comprises a large number of lenses. Reference numeral 2 denotes a main mirror, which is obliquely disposed on the photographing optical path or moved away depending on the observation state and the photographing state. A sub-mirror 3 reflects the light beam transmitted through the main mirror 2 toward the lower side of the camera body. Reference numeral 4 denotes a shutter. A photosensitive member 5 is composed of a silver salt film, a solid-state imaging device such as a CCD or MOS type, or an imaging tube such as a vidicon.
[0034]
Reference numeral 6 denotes a focus detection device, which includes a field lens 6a, reflection mirrors 6b and 6c, a secondary imaging lens 6d, an aperture 6e, an area sensor 6f composed of a plurality of CCDs, and the like disposed in the vicinity of the imaging surface. The well-known phase difference method is adopted.
[0035]
Reference numeral 7 denotes a focusing plate disposed on the planned image plane of the photographing lens 1, and 8 denotes a finder optical path changing pentaprism. Reference numerals 9 and 10 denote an image forming lens and a photometric sensor for measuring the luminance of the object in the observation screen. The image forming lens 9 is connected to the focusing plate 7 through the reflected light path in the pentaprism 8 like the optical path X2. The photometric sensor 10 is related to the conjugate.
[0036]
The viewfinder optical path X1 focuses light from the subject taken into the photographing lens 1 on the focus plate 7 via the main mirror 2, and displays the image on the focus plate on the half mirror 12 via the pentaprism 8. The light is combined with the light from the optical path X3, reaches the observer's pupil 18 through the eyepiece 11, and is observed.
[0037]
Next, the display optical path X3 will be described.
[0038]
First, light emitted from the backlight LED 17 enters the Fresnel lens 16, and enters the focus detection point display liquid crystal panel 15 on which display segments corresponding to a plurality of focus detection points are collected by the lens. The light beam that has passed through the focus detection point display liquid crystal panel 15 is reflected by the mirror 14, collected by the projection lens 13, and then combined with the finder optical path X 1 by the half mirror 12 through the eyepiece 11. It reaches the pupil 18 and is observed.
[0039]
Reference numeral 21 denotes a finder field mask. Reference numeral 20 denotes an in-finder LCD for displaying photographing information outside the viewfinder visual field, which is illuminated by the illumination LED 19 (F-LED) in FIG. The light that has passed through the LCD 20 in the finder is guided into the finder by the triangular prism 22, and the observer observes the photographing information.
[0040]
Reference numeral 31 denotes a diaphragm as a light amount adjusting member provided in the photographing lens 1, 32 denotes a diaphragm driving circuit including a stepping motor, 33 denotes a lens driving motor, and 34 denotes a lens driving member including a driving gear. A photocoupler 35 detects the rotation of the pulse plate 36 interlocked with the lens driving member 34 and transmits it to the lens focus adjustment circuit 38.
[0041]
Reference numeral 38 denotes a lens focus adjustment circuit, which drives a lens driving motor 33 by a predetermined amount based on information from the photocoupler 35 and lens drive amount information from the lens control circuit 39, thereby moving the focusing lens 1a of the taking lens 1 It is moved to the in-focus position.
[0042]
A lens control circuit 39 controls the lens focus adjustment circuit 38 and the aperture driving circuit 32 based on information from the camera. Reference numeral 37 denotes a mount contact which is an interface between a known camera and a lens.
[0043]
Next, the operation of the single-lens reflex camera of this embodiment will be described with reference to the flowcharts of FIGS.
[0044]
In FIG. 3, when the operation of the camera starts, the MPU 100 first initializes the MPU in step # 001. In step # 002, information such as camera settings and shooting data is read from the EEPROM in the MPU.
[0045]
In step # 003, communication with the switch sense circuit 108 is performed to detect a switch.
[0046]
In step # 004, if the external flash is attached, the process proceeds to step # 005, and if not, the process proceeds to step # 006.
[0047]
In step # 005, communication with the external flash is performed to obtain external flash information.
[0048]
In step # 006, if either the switch SW1 turned on by the first stroke of the release button or the narrowing SW is on, the process proceeds to step # 007, and if both switches are off, step # 025 (EEPROM writing). , The photographing information is written in the EEPROM, and the program is terminated.
[0049]
In step # 007, if the narrowing SW is off, the process proceeds to step # 008, and if it is on, the process proceeds to step # 010.
[0050]
In step # 008, communication is performed with the lens so that the aperture of the lens is opened, and the aperture of the lens is opened. At this time, if the lens is already in the open state, nothing is done even if this open communication comes.
[0051]
In step # 009, SPDNING = 0, which is a narrowing flag, stores that narrowing is not in progress.
[0052]
In step # 010, if SPDNING = 1, the lens is being narrowed down, so the process proceeds to step # 018, and if not, the process proceeds to step # 011.
[0053]
In step # 011, the shutter speed and the lens aperture value are calculated based on the luminance information of the subject from the photometry circuit 104 to determine the exposure amount.
[0054]
In step # 012, if the narrowing SW is on, the process proceeds to step # 013, and if it is off, the process proceeds to step # 016.
[0055]
In step # 013, the lens is communicated so as to narrow the difference between the aperture value calculated in step # 011 and the open aperture value of the lens. The lens receives this communication, drives the stepping motor, and drives the diaphragm. Furthermore, the lens continues to maintain the energization of the stepping motor even after narrowing down.
[0056]
In step # 014, the lens is communicated to turn off the energization of the stepping motor that is driving the aperture.
[0057]
In step # 015, SPDNING = 1 is set, it is stored that the lens is being narrowed down, and the process proceeds to step # 018.
[0058]
In step # 016, a focus detection operation is performed. This is based on the well-known phase difference detection method by the focus detection circuit 103 as described above.
[0059]
In step # 017, the MPU 100 adjusts the focus of the lens by controlling the lens control circuit 39 according to the focus detection state by the focus detection operation. In the next step # 018, communication is performed with the liquid crystal display circuit in order to display the shutter speed and aperture value in step # 011 and the focus detection result in step # 016 in the viewfinder.
[0060]
In the subsequent step # 019, the state of the switch SW2 that is turned on by the second stroke of the release button is checked, and if it is off, the process proceeds to step # 024. If the switch SW2 is on, the process proceeds to step # 020.
[0061]
In step # 020, if SPDNING = 1, the process proceeds to step # 021, the lens aperture is opened, and in step # 022, SPDNING = 0 is set, and the process proceeds to step # 023. If SPDNING = 1, the process proceeds to step # 023.
[0062]
In step # 020, if SPDNING is not 1, release control for exposing the film is performed in step # 023.
[0063]
Here, the release control will be described in detail with reference to the flowchart of FIG.
[0064]
In step # 201 of FIG. 4, if the external flash is attached, the process proceeds to step # 202, and if not, the process proceeds to step # 205.
[0065]
In step # 202, if the external flash is not fully charged, the process proceeds to step # 205. If the external flash is completed, the process proceeds to step # 203.
[0066]
In step # 203, pre-emission control by an external flash is performed, and the reflected light of the flash is calculated from the output of the photometry circuit 104.
[0067]
In step # 204, the flash emission amount is calculated based on the data in step # 203.
[0068]
In step # 205, the motor control circuit is driven to raise the mirror.
[0069]
In step # 206, communication is performed with the lens control circuit 39, the aperture value is sent, and the lens is narrowed down to the designated value.
[0070]
In step # 207, if flash photography is performed, communication with an external flash is performed in step # 208, and the flash emission amount and the start of emission are transmitted. If it is not flash photography, the process proceeds to step # 209.
[0071]
In step # 209, the front curtain is run by the shutter control circuit.
[0072]
In step # 210, it is determined whether or not the set exposure time has elapsed. If it has not elapsed, the process loops and waits until it elapses.
[0073]
In step # 211, the rear curtain is run by the shutter control circuit.
[0074]
In step # 212, communication with the lens control circuit is performed to open the aperture, and SPDNING = 0.
[0075]
In step # 213, the motor control circuit is driven to lower the mirror.
[0076]
If no film is loaded in step # 214, the release process is terminated (return). If a film is loaded, one frame is fed at step # 215 and the process returns.
[0077]
Returning to FIG. 3, if either the switch SW1 or the narrowing SW is turned on in step # 024, the process returns to step # 003. If it is off, various camera information is stored in the EEPROM in step # 025 and the program is terminated. .
[0078]
(Second Embodiment)
Hereinafter, a second embodiment according to the present invention will be described in detail with reference to FIG. 2, FIG. 5, FIG. 6, and FIG. Since FIG. 2 has already been described in the first embodiment, the description of FIG. 2 is omitted.
[0079]
FIG. 7 is a block diagram showing the main part of the electrical configuration of a single-lens reflex camera provided with a lens aperture SW according to the present embodiment.
[0080]
In FIG. 7, reference numeral 100 denotes a microcomputer central processing unit (hereinafter referred to as MPU) which is a camera control means built in the camera body. The source oscillation circuit formed by the oscillation circuit 101 is a signal in the MPU 100. Thus, the operating frequency of the MPU 100 is determined by not dividing, dividing by 1/2, or dividing by 1/16. Reference numeral 100b denotes an EEPROM serving as a storage unit, which can store photographing information. Reference numeral 100c denotes an A / D converter, which performs A / D conversion on analog signals input from the focus detection circuit 103 and the multi-division photometric sensor 104, as will be described later.
[0081]
A liquid crystal display circuit 102, a focus detection circuit 103, a photometry circuit 104, a shutter control circuit 105, a motor control circuit 106, a film travel detection circuit 107, and a switch sense circuit 108 are connected to the MPU 100. In addition, transmission is made to the lens control circuit 39 arranged in the photographing lens 1 via a mount contact 37 shown in FIG. Further, information is transmitted to the external flash circuit 110 via an external flash contact 111.
[0082]
The liquid crystal driving circuit 102 controls the display of the in-finder LCD 15 which is a liquid crystal panel for distance measuring point display within the finder visual field and the display in the finder LCD 20 outside the finder visual field in accordance with signals from the MPU 100.
[0083]
The focus detection circuit 103 performs accumulation control and readout control of the focus detection area sensor 6f according to the signal of the MPU 100, and outputs finder pixel information to the MPU 100. The MPU 100 A / D converts this information, performs focus detection by a well-known phase difference detection method, sends the detected focus detection information to the lens control circuit 39, and adjusts the focus of the lens.
[0084]
The photometric circuit 104 outputs an output from the photometric sensor 10 to the MPU 100 as a luminance signal of each area in the screen. The MPU 100 A / D converts the luminance signal and adjusts the exposure for shooting.
[0085]
Further, the flash control of the present embodiment is a method in which pre-flash is performed before flash emission at the time of shooting and the flash emission amount at the time of shooting is determined, and the photometric sensor 10 also performs photometry at the time of pre-flash. .
[0086]
The shutter control circuit 105 controls the exposure by causing the shutter front curtain (via the magnet MG-1) and the shutter rear curtain (via the magnet MG-2) to travel in accordance with a signal from the MPU 100.
[0087]
The motor control circuit 106 controls the motor in accordance with a signal from the MPU 100, thereby performing up / down of the main mirror 2, charging of the shutter, and feeding of the film.
[0088]
The fill travel detection circuit 107 detects whether or not the film has been wound up by one frame when the film is fed, and sends a signal to the MPU 100.
[0089]
SW1 is turned on by a first stroke of a release button (not shown) and a switch for starting photometric and AF operations, and SW2 is turned on by a second stroke of a release button (not shown) to start an exposure operation. It is. The aperture SW is a switch that instantaneously drives the aperture of the lens.
[0090]
The aperture energization holding SW is a switch for selecting whether to hold the energization of the stepping motor or to turn off the energization after the aperture drive by the aperture SW, and in this embodiment, the aperture SW is not shown. The mechanism is such that it cannot be switched while is on. In addition, the switch sense circuit 108 detects the status signal of the operation member of the camera (not shown) and sends it to the MPU 100.
[0091]
Next, the operation of the single-lens reflex camera of the present embodiment will be described using the flowchart of FIG.
[0092]
In FIG. 5, when the operation of the camera starts, the MPU 100 first initializes the MPU in step # 301. In step # 302, information such as camera settings and shooting data is read from the EEPROM in the MPU.
[0093]
In step # 303, communication with the switch sense circuit 108 is performed to detect a switch.
[0094]
In step # 304, if the external flash is attached, the process proceeds to step # 305, and if not, the process proceeds to step # 306.
[0095]
In step # 305, communication with the external flash is performed to obtain external flash information.
[0096]
In step # 306, if either the switch SW1 turned on by the first stroke of the release button or the narrowing SW is turned on, the process proceeds to step # 307, and if both switches are turned off, step # 330 (EEPROM writing). , The photographing information is written in the EEPROM, and the program is terminated.
[0097]
If the aperture energization holding SW is ON in step # 307, the flag is set to EMD_KEEP = 1 for maintaining energization after aperture drive, and the process proceeds to step # 310. If the aperture energization holding SW is off, the process proceeds to step # 309, EMD_KEEP = 0, and the process proceeds to step # 310.
[0098]
In step # 310, if the narrow-down SW is off, the process proceeds to step # 311. If it is on, the process proceeds to step # 313.
[0099]
In step # 311, communication is performed with the lens so that the aperture of the lens is opened, and the aperture of the lens is opened. At this time, if the lens is already open, the lens does nothing even if this open communication comes.
[0100]
In step # 312, it is stored that narrowing is not in progress by setting SPDNING = 0, which is a narrowing flag.
[0101]
In step # 313, if SPDNING = 1, the lens is being narrowed down, so the process proceeds to step # 322. If not, the process proceeds to step # 314.
[0102]
In step # 314, the exposure speed is determined by calculating the shutter speed and the aperture value of the lens based on the luminance information of the subject from the photometry circuit 104.
[0103]
In step # 315, if the narrowing SW is on, the process proceeds to step # 316, and if it is off, the process proceeds to step # 320.
[0104]
In step # 316, communication is performed with the lens so as to narrow the difference between the aperture value calculated in step # 314 and the open aperture value of the lens. The lens receives this communication, drives the stepping motor, and drives the diaphragm. Furthermore, the lens continues to maintain the energization of the stepping motor even after narrowing down.
[0105]
In step # 317, if EMD_KEEP = 1, the process proceeds to step # 318, otherwise the process proceeds to step # 318.
[0106]
In step # 318, the lens is communicated to turn off the energization of the stepping motor that is driving the aperture.
[0107]
In step # 319, SPDNING = 1 is set, it is stored that the lens is being narrowed down, and the process proceeds to step # 322.
[0108]
In step # 320, a focus detection operation is performed. This is due to the phase difference detection method performed by the focus detection circuit 103 as described above.
[0109]
In step # 321, the MPU 100 adjusts the focus of the lens by controlling the lens control circuit 39 according to the focus detection state by the focus detection operation. In the next step # 322, communication is performed with the liquid crystal display circuit in order to display the shutter speed and aperture value in step # 314 and the focus detection result in step # 320 in the finder.
[0110]
In the subsequent step # 323, the state of the switch SW2 that is turned on by the second stroke of the release button is checked, and if it is off, the process proceeds to step # 329.
[0111]
If the switch SW2 is on, the process proceeds to step # 324.
[0112]
If SPDNING = 0 in step # 324, the process proceeds to step # 328. If SPDNING = 0, the process proceeds to step # 325.
[0113]
If EMD_KEEP = 0 in step # 325, the process proceeds to step # 326 to open the lens aperture. If EMD_KEEP = 0, the process proceeds to step # 328.
[0114]
In step # 327, SPDNING = 0.
[0115]
In step # 328, release control for exposing the film is performed.
[0116]
Here, the release control will be described in detail with reference to the flowchart of FIG.
[0117]
In step # 401 of FIG. 6, if an external flash is attached, the process proceeds to step # 402, and if not, the process proceeds to step # 407.
[0118]
In step # 402, if the external flash is not fully charged, the process proceeds to step # 407, and if charged, the process proceeds to step # 403.
[0119]
In step # 403, if the lens is being narrowed down, in order to perform photometry by flash pre-emission, the process proceeds to step # 404, where the lens aperture is opened and SPDNING = 0. If not narrowing down, the process proceeds to step # 405.
[0120]
In step # 405, pre-emission control by an external flash is performed, and the reflected light of the flash is calculated from the output of the photometry circuit 104.
[0121]
In step # 406, the flash emission amount is calculated based on the data in step # 405.
[0122]
In step # 407, the motor control circuit is driven to raise the mirror.
[0123]
In step # 408, if the lens is being narrowed down, the process proceeds to step # 410. Otherwise, the process proceeds to step # 409.
[0124]
In step # 409, communication is performed with the lens control circuit 39, the aperture value is sent, and the lens is narrowed down to the designated value.
[0125]
In step # 410, if it is flash photography, in step # 411, communication with the external flash is performed, and the flash emission amount and the emission start are transmitted. If it is not flash photography, the process proceeds to step # 412.
[0126]
In step # 412, the front curtain is run by the shutter control circuit.
[0127]
In step # 413, it is determined whether or not the set exposure time has elapsed. If it has not elapsed, the process loops and waits until it elapses.
[0128]
In step # 414, the rear curtain is run by the shutter control circuit.
[0129]
In step # 415, communication with the lens control circuit is performed to open the aperture, and SPDNING = 0.
[0130]
In step # 416, the motor control circuit is driven to lower the mirror.
[0131]
If no film is loaded in step # 417, the release process is terminated (return). If a film is loaded, one frame is fed at step # 418 and the process returns.
[0132]
Returning to FIG. 5, if either the switch SW1 or the narrowing SW is turned on in step # 329, the process returns to step # 303. If it is off, various camera information is stored in the EEPROM in step # 330 and the program is terminated. .
[0133]
【The invention's effect】
As described above, according to the present invention, the current consumption can be reduced because the stepping motor that drives the light amount adjusting member such as the diaphragm is turned off after the diaphragm is narrowed down. I was able to.
[0134]
In addition, when a release operation is performed during narrowing down, the aperture is once opened, and the photographing is performed again while energization of the narrowing stepping motor is performed, so that the narrowing accuracy is not lowered.
[0135]
Furthermore, according to the present invention, it is possible to select whether to turn off the energization of the stepping motor after the aperture driving of the lens by the aperture switch or to keep it on by the aperture energization holding switch. In other words, once the aperture was opened and the time for re-squeezing was concerned, the photographer could freely select the shooting scene or the like.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a main part of an electrical configuration built in a camera according to a first embodiment of the present invention.
FIG. 2 is a diagram showing an optical arrangement of a single-lens reflex camera according to the first embodiment of the present invention.
FIG. 3 is a flowchart showing a series of operations of the camera of the first embodiment.
FIG. 4 is a flowchart showing a series of operations of the camera of the first embodiment.
FIG. 5 is a flowchart showing a series of operations of the camera of the second embodiment.
FIG. 6 is a flowchart showing a series of operations of the camera of the second embodiment.
FIG. 7 is a block diagram showing a main part of an electrical configuration built in the camera according to the second embodiment of the present invention.
[Explanation of symbols]
100 ... MPU
105. Shutter control circuit
106: Motor control circuit
107: Film running detection circuit
31 ... Aperture
32 ... Drive circuit
33 ... Lens driving motor
34 ... Lens driving member
39 ... Lens control circuit

Claims (3)

Oite to communicate controllable camera and imaging lens is driven by a stepping motor having a light amount adjusting means for adjusting the amount of light passing through the lenses,
A narrowing switch,
A release switch button having a first stroke and a second stroke;
Control means for driving the light amount adjusting means to narrow down by operating the narrowing switch,
The control means, the line narrowing operation of the light amount adjustment member through said stepping motor in response to the operation of the narrowing switch Nawaze, after narrowing down the light amount adjustment member, to stop the energization of the stepping motor And taking a picture after opening the light amount adjusting member in accordance with a second stroke of the release switch button in a state where the narrowing switch is operated, and then narrowing down the light amount adjusting member. Camera . Wherein, when said second stroke operation of the release switch button is, camera according to claim 1, characterized in that pre-SL performs the release while maintaining the power distribution to the stepping motor. It is comprised by the camera of Claim 1 or 2, and the said photographic lens,
The camera system, according to an instruction from the control means, transmits information indicating that the light amount adjusting member is being narrowed down to the camera while the light quantity adjusting member is being narrowed down .

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