JPS60430A - Camera provided with exposure control mechanism - Google Patents

Abstract

PURPOSE:To execute an exposure control suitable for a still picture recording mode and a movie picture recording mode, by providing an operating means for stopping down a diaphragm from a full-aperture position to a prescribed value position, and a shutter operating means for opening and closing a shutter for a prescribed time in accordance with a shutter control signal. CONSTITUTION:A titled camera is provided with a diaphragm operating means 15 for stopping down a diaphragm from a full-aperture position to a prescribed value position in accordance with a diaphragm control signal from an exposure controlling circuit, and shutter operating means 31, 32 for opening and closing a shutter for a prescribed time in accordance with a shutter control signal fed from the exposure controlling circuit.

Description

[Detailed description of the invention] The present invention relates to a camera equipped with an exposure control mechanism.

In a single-lens reflex camera, the aperture is held at the open position and the original image transmitted through the photographic lens is observed. It is also configured to measure the brightness of the subject.

However, in these conventionally known cameras, the aperture is instantaneously narrowed down to a manually set value each time the shirt is released, or to a value automatically set depending on the brightness of the subject. It is composed of Further, in the cinema camera 2 or the VTR camera, the crest is continuously controlled according to one of the above-mentioned settings during the shirt release operation time. By the way, cameras are known that have both the functions of a still camera and a camera, or the function of recording still images and VTR images on separate magnetic recording media. When recording stealth images, it is necessary to stop the aperture for each exposure, and when recording movie images or VTR images, it is necessary to continuously control the aperture during shutter release operation. .

Therefore, configuring a camera with such a control function to have both aperture control functions tends to complicate the camera structure, and has disadvantages such as causing malfunctions and increasing costs. Conceivable.

The present invention aims to solve the above-mentioned problems, and includes an aperture operating means for narrowing down the aperture from an open position to a predetermined value in response to an aperture control signal from an exposure control circuit; A shutter operating means is provided which opens and closes the shutter for a predetermined time determined by the shutter release control circuit in response to a shutter control signal, and the shutter control signal is used to open and close the shutter for a predetermined time determined by the shutter release control circuit. a first shutter control signal for opening and closing;
During operation with both shutter releases at a low λ, the exposure control circuit includes a second shutter control signal that maintains the shutter in an open state, and the aperture control signal of the exposure control circuit is controlled by the first shutter control signal. By configuring the first aperture control signal to actuate the aperture actuating means to narrow down the aperture to a predetermined value each time the shutter opens and closes, and the camera is configured as described above, the camera can be set to, for example, a still image recording mode. When configured to be operable in movie image recording mode, exposure control suitable for each mode can be performed by the combination of the first and second shutter control signals and the aperture control signal. . Furthermore, when a solid-state image sensor is placed in a photographing optical path including an aperture and a shutter, the camera functions as a so-called electronic camera.

The invention will now be described in detail according to two embodiments shown in the accompanying drawings.

Example 1 (A) Structure of Interchangeable Lens FIG. 1 shows the structure of an interchangeable lens A used in a single-lens reflex camera according to the present invention. A hole seat 1 fixed inside a male helicoid tube of an interchangeable lens (not shown) receives the bottles of a plurality of aperture blades 2 and rotatably supports the aperture blades 2.

A bottle 3a of a chrysanthemum seat 3 is inserted into the long hole 2a of the aperture blade 2, and the chrysanthemum seat 3 is rotatably supported by the aforementioned male helicoid tube. The chrysanthemum seat 3 is rotatably biased in the counterclockwise direction, that is, in the direction to narrow the aperture, by a spring 71 disposed between the fixed shaft 3b and the male helicoid cylinder. Axis 3
b is a long groove passing through one arm of the bell crank 4 rotatably attached to the male helicoid tube.

A shaft 4a is mounted on the thin arm of the Pelcla/li 4, and its tip can come into contact with a cam surface 6a of a cam ring 6 rotatably attached to the lens barrel body (not shown). It is extending. The cam ring 6 is urged to rotate counterclockwise by a spring 72 disposed between the cam ring 6 and the lens barrel body. The shape of the cam surface 6a is configured such that the length in the radial direction from the center of rotation of the cam ring changes as the rotation position of the cam ring 60 changes, and as the cam ring 6 rotates clockwise, the length changes as the cam ring 6 rotates clockwise. Shorter, bell crank 4
Reduce the amount of zero rotation possible and set the aperture in the direction of the larger diameter.

The shaft 3b of the chrysanthemum seat 3 mentioned above further extends in the direction of the optical axis of the lens, and is always in contact with the protrusion 9a of the aperture lever 9, which is rotatably attached to the lens barrel body, so that its movement is restricted. There is. The shaft 3b and the shaft 4a move back and forth in the optical axis direction in conjunction with the focus adjustment or focal length adjustment of the lens, but the cam ring 6 and the aperture lever 9 do not move with respect to the above-mentioned adjustments, so they do not engage during these adjustments. It is assumed that the shafts 3b and 4a have a sufficient engagement length so that the shafts 3b and 4a do not come off.

The rising edges 6b and 9b of the cam ring 6 and the aperture lever 9 pass through a notch Ila in the circumferential direction of the mount portion 110 of the interchangeable lens A and project toward the rear of the interchangeable lens.

The fixed protrusion 11b of the mount portion 11 is a member for transmitting the aperture value to the camera body B, which will be described later. In addition, fixed protrusion 1
1b can be replaced with a fixed resistor or a photoelectrically or electrically detectable code, and the open aperture value of the attached lens is transmitted to the camera body by connecting the interchangeable lens A and the camera body B. Good to have. Further, the fixed protrusion 11c of the mount portion 11 is a member for limiting the open aperture value of an aperture ring (described later) provided on the camera body B.

In addition, the non-linearity of the aperture value change with respect to the rotation of the chrysanthemum 3 is as follows.
This is corrected depending on the shape of the cam surface 6a of the cam ring 6.

Therefore, the change in the number of aperture stages and the change in the rotation angle of the aperture ring are in a proportional relationship, and the change in the rotation angle per one stage change in the aperture for each conversion lens is the same.

In addition, each interchangeable lens has a rising edge 6b of the cam ring 6, regardless of the maximum aperture value when the lens is attached.
The angular position of is set so that the aperture value from a fixed point is the same. Therefore, from the angular position of the rising edge 6b, the set aperture value of any interchangeable lens with an open aperture value can be known.

When using this type of aperture control method, when performing aperture metering, the aperture value for obtaining the correct exposure cannot be calculated unless the aperture value of the interchangeable lens being used is input to the exposure control circuit. Needless to say.

In addition to this method, the position of the rising edge 6b of the cam ring 6 corresponding to the maximum aperture value of each interchangeable lens is set to the same position regardless of the maximum aperture value, as is widely used in conventional aperture metering-eye reflex cameras. There is a method of unifying the number of aperture stages, but in this embodiment, the former method will be used for explanation.

Further, a bayonet claw 12 having a well-known configuration for conventional interchangeable lenses is arranged on the mount section 11, and engages with a fitting section (not shown) of a mount flange 510 of a camera body B, which will be described later, to mount the interchangeable lens A. Fix it to main body B. Further, the mount portion 11 is provided with a notch 11d for positioning the interchangeable lens A.

As is clear from the above explanation, the interchangeable lens A does not have an operation ring that can be operated from outside the camera to set the aperture value. The position of the cam surface 6a of the cam ring 60 is determined by the position of the cam surface 6a of the cam ring 60.

(B) Structure of the camera body FIG. 2 shows the camera body B& to which the interchangeable lens A shown in FIG. 1 is attached. In the figure, an aperture ring 50, which is an operating member for setting an aperture value, is rotatably attached to a fixed mount flange 51. This aperture ring 50 has an external
A protrusion 50b is constantly provided inside the protrusion 50a. Further, as is clear from the figure, the aperture ring 50 is engraved with an aperture value, and by manually rotating the aperture ring 50, the desired aperture value is matched with the index 51a of the two/door ring 51. The aperture value for manual mode is set. In the illustrated example, the maximum aperture of the prepared interchangeable lens is Fl, 4, and the minimum aperture is F22.
The aperture value is set to suit the case.

Furthermore, rAJ is a mode display value for automatically controlling the aperture in the T-TL open side light mode. The protrusion 50m of the aperture ring 50 mentioned above is arranged at a predetermined distance from the maximum aperture value, for example, rFl, 4J display,
The index 5 of the mount flange 51 engages with the limiting member 11c of the interchangeable lens A determined by the open aperture value of the interchangeable lens A to be used, and the open aperture value of the interchangeable lens A to be used is determined by the index 5 of the mount flange 51.
1a, further rotation of the aperture ring 500 toward the larger aperture value is prevented.

For example, when the open aperture value of the interchangeable lens A is F5.6, when the aperture ring 50 is rotated so that the F5.6 display on the aperture ring 50 matches the index 51m, the aperture limiting member 11a of the interchangeable lens A engages with the protrusion 50m of the aperture ring 50, and prevents the aperture ring 50 from further rotating toward the larger aperture value.

An aperture control ring 15 is attached to the rear part of the mount flange 51 so as to be rotatable with respect to the camera body B (not shown), and its rising edge 15a protrudes to a position where it can engage with the aforementioned protrusion 50b. Further, the inner protrusion 15b of the diaphragm control ring 15 is always engaged with the rising edge 6b of the cam ring 6 when it is attached to an interchangeable lens, and limits the rotation of the cam ring 60 due to the bias of the spring 72. Also aperture system 911
As is clear from FIG. 2, the gear 15c on the outer periphery of the J-ring 15 is connected to a motor 19 via a gear train 18, and the diaphragm control ring 15 is driven to rotate when the motor is energized.

Furthermore, the brush 16 fixed to the aperture control ring 15 is
The aperture control ring 150 slides on a printed circuit board 17 fixed to the camera body B (not shown), and the amount of rotation of the aperture control ring 150 is converted into a resistance value or binary number, and the aperture is controlled by an exposure control circuit (not shown in FIG. 2). Input as a value signal. Incidentally, since the cam ring 6 is driven by the aperture control ring 15 'K, the brush 16 and the printed board 17 may be provided on the lens barrel body. In this case, interchangeable lens A has
It is necessary to provide an electrical contact for inputting the aperture value signal to the camera body B.

When set to the position, the discrimination bin 60 falls into the notch 50c and operates the contact piece of the switch 61 to discriminate that the camera is in the aperture control mode.

A sliding plate 51 whose long groove 51a is guided by a pin 52 is arranged near the aperture control ring 15, and its protrusion 51b is biased by a spring 53 to adjust the maximum aperture value of the interchangeable lens A when the interchangeable lens A is attached. It is moved by hitting the projection 11b of the transmission member. With this movement, the sliding plate 51 slides to the left,
The brush 54 slides on the printed board 55, and the open aperture value of the interchangeable lens person is converted into a resistance value or into a binary number, and is input as a signal to the exposure control circuit and display circuit of the camera.

On the camera body B, an aperture operating lever 20 is rotatably supported around a pin 21 and biased clockwise by a biasing spring T3. The clockwise movement due to the bias of the spring 73 is prevented. Near the aperture operating lever 20,
A pin 23 is installed to prevent the aperture operating lever 20 from wobbling. Further, the rise 20b of the aperture operating lever 20 is the rise 9b of the aperture lever 9 of the interchangeable lens A.
, and prevents counterclockwise rotation of the riser 9b due to the bias of the spring γ2 before the shutter release.

Therefore, the aperture blades 2 maintain an open state. The lever 20 is provided with a curved portion 20m that forms a pressure relief portion where the lever 20 is pulled by the spring 73 and suddenly displaced by a slight counterclockwise rotation of the cam 22. The cam 22 is meshed with a gear 26 rotating in a gear train 24tL. The gear 26 is rotatably supported by a printed board 28, and the brush 2T fixed to the cam 22
Corresponding to 0 rotation, print board 28 top +7) pattern 28
a to detect the position of the cam 22.

FIG. 3 shows an alternative embodiment of the diaphragm actuation mechanism of FIG.

In the figure, a beaded lever 301 is rotatably attached to the camera body B, and its -arm 301a is connected to a plate 302 that is slidable left and right. The tip of the second yoke 301b of the lever 301 can engage with the tip of the start lever 304, which is attracted by the plunger 303 and rotates clockwise.

Further, the third arm 301c of the lever 301 is connected to the plunger 30.
5 so that it can be engaged with it so as to be attracted by it. A biasing spring 30 rotates the lever 301 clockwise.
6 is supported at one end. The sliding plate 302 is located within the rotation range of the rising edge 9b of the aperture lever 9 of the interchangeable lens A, as in the previous embodiment, and controls the operation of the aperture lever 9.

(Structure of C1 Shutter FIG. 4 shows the structure of shutter C used in the camera according to the present invention. Shutter C is arranged between an interchangeable lens A and a photosensitive material (not shown) in camera body B, such as photographic film. is a so-called focal plane shutter or a behind shutter placed between solid-state image sensors such as CCDs.

In the figure, the shutter has completed exposure, and a leading blade 31 and a trailing blade 32 are rotatably supported on a shaft 33 on a shutter base plate 30. Shutter base plate 30
has an opening 30 opened and closed by the blades 32 and 33.
A is provided. Long size 3 near one end of the leading blade 31
1m, a pin 34m installed at one end of the leading blade drive lever 34 is fitted without play. Front curtain drive lever 3
4 is rotatably supported by a shaft 35 on the base plate 30, and has a pin 34b planted at the other end, and the end fits into a recess 36a of the ground gloss 36.

By energizing the coil 37 of the plunger 36, the gra/jar 3
6 is pulled in the direction of the arrow, the lever 34 rotates counterclockwise, the front curtain 31 of the shutter rotates clockwise, and the opening 30
The shutter is closed completely and the spring 42 is kept in a biased state.

The trailing blade 32 also has an elongated hole 32a having the same structure as the driving mechanism of the leading blade 31.

Rear curtain drive lever 38, pins 38m, 38b.

It has a shaft 39, a spring 43, a plunger 40, its recess 40m, and a coil 41. When the coil 41 is energized, the trailing curtain blade 32 is driven, and the shutter is opened with the spring 43 energized to enter a standby state.

Leading blade drive lever 34 and trailing blade drive lever 38
As described above, the springs 42 and 43 are respectively disposed between the coils 37 and 41, and by cutting off the current to the coils 37 and 41, each blade is biased by the spring. Move to the position shown and perform exposure.

Further, a reflecting member 31c is attached to the leading end portion 31b of the leading curtain blade 310, and a seven-way interlager 31d is placed at the location where the reflecting member 31c is located when the leading blade 310 finishes traveling, and its reflection is detected. , the X contact for electronic flash tuning is turned on.

(D) Configuration of camera control system Figure 5 shows that a subject image is formed on the picture element surface of a solid-state image sensor using an interchangeable lens A, and this is electrically read out as an image signal, and an NTSC signal Kf is sent to the image processing circuit. In other words, the present invention is applied to a so-called electronic camera that records magnetic signals on a medium such as a magnetic disk or magnetic tape at a predetermined speed, for example, 30 frames per second.

In FIG. 5, the resistance value of the A/D/total plate 55 of the interchangeable lens A is converted into a digital value via a νγ1 inverter, and is input to a control circuit CPH consisting of a system controller and an exposure controller. The power source of the camera body B is connected by operating the switch sw. Further, the rotational position of the aperture control ring 15 that follows the aperture ring 50 on the camera body B side is controlled by the A/G via a resistor 17a.
The signal is input to the D converter, converted into digital data, and similarly input to the control circuit CPU. A part of the object light incident on the interchangeable lens A enters the finder optical system via the half prism HPI, a part of which enters the light receiving element P via the half prism HP2, and the rest enters the focus plate EP,
It becomes finder light via the roof prism DP and the eyepiece BP. The light incident on the light-receiving element P is converted into an electrical signal and inputted to the control circuit CPUK via the amplifier AMP and the A/D converter.

CK is a clock signal generator for controlling the control circuit CPU.

The light transmitted through the half prism HP1 is imaged on the solid-state image sensor COD via the Ronos filter LP and the mosaic filter MF, and the read image signal is converted into a TV multiplied signal by a conventionally well-known image processing circuit PC. control circuit CP
The information is recorded by the magnetic head HD under the control of U on a magnetic disk DK or a magnetic tape (not shown) in a magnetic recording device VTR. As described above, the plungers 37 and 41 are connected to the shutter blades 31 and 32, in which a silver halide film and a conventionally known camera using the same may be used instead of the image processing system below the solid-state image sensor CCD. The operation of these plungers is controlled by instruction signals from the control circuit CPU.

This can be considered to be because a so-called conventionally known two-magnet type electronic shutter circuit is added to the function of the control circuit CPH. A photographing mode selection member BM is connected to the control circuit CPU via an input input circuit I10, and by rotating the operation dial, - frame photographing mode "S", multiple frame continuous photographing mode rcJ and VTR or 8 are selected. A movie mode rMVJ suitable for Vm shooting etc. can be selected. Furthermore, an operating member FC for over-exposure and under-exposure correction, so-called fractional control, is connected to the control circuit CPU. Furthermore, shirt release releases RLS and RLM are connected to the control circuit CPU.

The shirt release RLS is an operating member for the above-mentioned single-frame shooting mode and continuous shooting mode, and its first operation turns on a switch (not shown) of the photometry circuit and also activates the input/output circuit I10 of the motor 19. The motor 25 is energized by the second stage operation or the sill/gloss 3 shown in Fig. 3 is energized.
03 and 305 to start an aperture value control operation, and further energization control to the plungers 37 and 410 of the shutter C to perform an exposure operation.

Also, connect the recording device VTR to camera body B and use RFC.
When the button and PLAY button are pressed, the control circuit C
PU transfers the TV signal from the magnetic disk DK to the recording device VT.
It switches to R so that it can be recorded. When the above two buttons are pressed, the recording device VTR will switch to
Waiting in AUSE state.

The shirt release RLM is an operating member for the movie mode described above, and when the recording device VTR is in the standby state as described above, the first stage operation of the release RLM turns the photometry switch (not shown) to O or H. and the control circuit CP
U operates the motor 19 to rotate the aperture control gear 5, determines the aperture value to be set, and controls the control circuit C in the second stage operation.
PU operates motor 25 and closes down the aperture to the photometric value,
The shutter blade 31 is opened to start recording on the flange device 1VTR.

In addition, a shutter speed selection member sp is connected to the control circuit CPU via an input light input circuit I10 and a pass line, and a predetermined speed can be selected. For each shutter speed that corresponds to
When set to "A" display, automatic control of exposure at a predetermined aperture and shutter speed according to the photometric value, that is, exposure control in a so-called program mode is possible.

FIG. 6 schematically shows the control circuit CPU shown in FIG. As is clear from the figure, the control circuit CPU includes a system controller CPU1 electrically connected to each other.
and a 14-output controller CPU2. The system controller cptyi is connected to a camera power supply (2) and, if necessary, a power supply (2) for a recording device VTR.

Further, the system controller CPUIK receives a shirt release signal for stealth and a shirt release signal for VTR (movie) by pressing buttons RLS and RLM, respectively.

This suppression is a two-stage operation as described above, and in the first stage operation of each of the shirt release RLS and RLM, the exposure controller CPU is
The signals SE1 and ME1 are sent to the exposure controller CPU2, respectively, and the exposure controller CPU2 becomes capable of photometry except in the manual exposure control mode. The photometry information is transmitted from the light receiving element P to the exposure controller CPU via the side light amplifier fAMP.
2. Next, in the second stage operation, the system controller CPU1 sends signals SE2 and ME2' to the exposure controller CPU2, and the exposure controller CPU2 generates an aperture signal and an aperture return signal for rotating the chrysanthemum cone 3 of the interchangeable lens A. At the same time, the plunger coils 37 and 41 of the shutter blades are actuated to generate a signal for opening and closing the shutter. Although not shown in FIG. 6, as explained in the configurations of FIGS. 2 and 5 (
The opening and closing of the diaphragm is performed by energizing the motor 19 and the motor 25.

Further, the exposure controller CPU, 2 receives an open aperture value signal from the interchangeable lens A, a shutter speed signal from the shutter speed selection member sp, and an aperture ring 5 for exposure control.
A control aperture value signal from 0 and an exposure correction signal from the fractional control member FC are input as digital values. Furthermore, the system controller CPU1 has
The signal from the mode selection member EM is transmitted to the exposure controller C.
Position signals for driving and stopping the motor 25 and the cam 22 (FIG. 2) are digitally input to the PU 2 as signals based on a pattern 28&.

Furthermore, the system controller CPU 1 includes a fifth
The recording device VTR is connected so as to carry out the operation explained in connection with the figure, and the disk mechanism DISK in the camera body B, which will not be described because its configuration itself is not related to the gist of the present invention, is connected. ing.

(E) Attaching the lens The operation of attaching the interchangeable lens to the camera body B will be explained using FIGS. 1 to 3. First, attach an interchangeable lens A with a predetermined maximum aperture value to the camera body B.
When each 1971 part is aligned with the 1971 part 11 and rotated (in the direction of the arrow in Fig. 1), the two are bayonet-coupled as is well known in the art, and a mount flange ring is inserted into the notch 11d provided in the 1971 part 11 of the interchangeable lens. A lock pin (not shown) provided at 51 is inserted to fix the interchangeable lens A to the camera body B.

By this mounting operation, the notch 11m of the mount part 11,
The rising edge 6b of the cam ring 6, which is actually observed from 6., engages with the protrusion 15b of the aperture ring 15, pushes it counterclockwise, and presses the co-protrusion 15m against the protrusion 50b of the aperture ring 50. The rising edge 9b of the aperture lever 9 comes into contact with the rising edge 20b of the aperture operating lever 20, which is maintained in the position shown in FIG. 2 by the cam 22 and rotates clockwise.
The shaft 3b of the chrysanthemum seat 3 being held is rotated clockwise against the bias of the spring 71, and the crest blade 2, which is drive-controlled by the chrysanthemum seat 3, is held at the aperture open position.

The above explanation is exactly the same in the configuration shown in Figure 3, and the rising edge 9b contacts the sliding plate 302 and rotates counterclockwise, thereby holding the aperture blade 2 at the aperture open position. .

The protrusion 11c provided on the mount portion 11 of the interchangeable lens A is
It protrudes to a position where it can engage with the protrusion 50a of the aperture ring 50, and the aperture 9 is set to a value greater than or equal to the maximum aperture value of the attached interchangeable lens A.
It works to prevent the gear 50 from rotating. In addition, aperture/g5
When the aperture value above 0 is set to the "A" position, the protrusion 50b of the aperture ring 50 is rotated further counterclockwise than the minimum aperture value position during manual aperture control, so the aperture control ring The rotation of the projection 15m of No. 15 is not hindered by the projection 50b. As described above, the attachment of the interchangeable lens A to the camera body B is completed, and at the time of completion, the aperture is maintained in an open state, and so-called wide-open photometry becomes possible.

Below, a schematic diagram of the configuration of the camera system shown in FIG. 5 and a flowchart of FIGS. 7 to 10 will be used in conjunction with FIGS. 1 to 4 described above to explain the operation of the configuration according to the present invention in various shooting modes. do. In the flowcharts shown in Figures 7 to 10, the AV top set, TV top set, logarithmically converted values of manually set aperture and shutter speed, and AV cam R are necessary when electrically controlling the aperture. Aperture value signal, AV, generated by the positional relationship between the brush 16 and the resistor 17a, which are interlocked with the aperture 9 control ring 15 for determining the position of the cam surface 6a of the cam name.
The cam RMAX is the maximum value, the AV cam RMIN is the minimum value, MY is the photometric calculation value, C is a constant number, α is the play of the aperture drive mechanism, and EV is the phase of BY and SV.

(F) Still mode shooting ■ Manual! v-1 Need Photography First, operate the power switch SW shown in FIG. 5 to turn on the control circuit CPU. Operate the piece mode selection member KM to select -piece mode r
After setting S and J, a desired shutter speed is selected from the shutter speed selection member 5P4C. A digital output signal from the shutter speed selection member SP is input to the control circuit CPU. Next, the aperture ring 50 is rotated to set a desired aperture value (F16 in FIG. 2). Second
As shown in the figure, the aperture control ring 15
follows the protrusion 50b and occupies a position corresponding to the aperture value,
As a result, the position of the cam surface 6a of the cam ring 6 is determined by the rotation of the rising portion 6b. Through this operation, the amount by which the shaft 4a of the bell crank 4 should be rotated is determined, and the aperture value is determined (at this stage, the aperture blades 2 have not yet been narrowed down).

When the shirt release RL S wog in Figure 5 is operated, a signal SE1 is sent from the system controller CPU1 in Figure 6 to the exposure controller CPU2 (S in Figure 8).
(EI ON), the sawing controller CPU2 determines whether the program mode or the shutter speed priority mode is set. As described above, since the manual control mode is set, a NO determination is made, and a determination is made as to whether the aperture priority shutter speed control mode is set, and the result is NO. Here, the part indicated by 8a in FIG. 8 shows the rest of the flow of the second embodiment, which will be described later, so that, although the first embodiment has this configuration, no judgment or operation is performed here.

Next, when the shirt release RLS is operated to the second stage, the signal SE2 turns ON, the motor 25 is energized, and the cam 22 moves 180° counterclockwise in FIG.
The position of the cam 22 is detected by the brush 27 sliding on the pattern 28a, and the soter 25 stops.
Cam 22 also stops.

By this action of the cam 22, the locking of the stop-operating lever 20 is released, and the rising edge 20b of the stop lever 20 is changed from the rising edge 9b of the aperture lever 9.
run away from Since the aperture lever 9 is unlocked, it rotates counterclockwise together with the shaft 3b by the force of the biasing spring 11 of the shaft 3b of the chrysanthemum seat 3.

As a result, the chrysanthemum seat 3 and the bell crank 4 rotate from the aperture open position, the shaft 4a of the bell crank 4 rotates until it comes into contact with the cam surface 6a of the cam 6, and the aperture blades 2 are rotated until the aperture value reaches the set aperture value. It will be done.

The above narrowing down operation is performed in exactly the same way in the configuration shown in FIG. That is, Fig. 3: F+5 operation In Fig. 5, when the second step of the release RLS' is operated, the cylinder 303 is energized, the suction reno 304 rotates clockwise, and the ball reno 30 is rotated clockwise.
1 also rotates clockwise. As a result, the sliding plate 302
moves to the right, making it possible for the rise 9b of the aperture lever 9 to follow. The narrowing operation of the aperture blades 2 is performed in exactly the same manner as described above with the configuration shown in FIG.

In parallel with the above aperture operation, the front curtain plunger coil 3 of the shutter in the exposure completion state as shown in FIG.
1 and the trailing curtain blade 41 are energized, the leading blade 31 is moved to a position where it shields the aperture 30, and the trailing blade 32 is moved further downward, resisting the biasing springs 42 and 43. to hold the standby position.

After a delay until the above-mentioned narrowing down operation is completed, the power to the leading granger coil 3T is cut off by a signal from the control circuit CP, U (g output controller CPU2), and the leading blade 31 is moved to the position shown in FIG. The camera moves to , and exposure begins. After the set time, the power to the coil 41 is cut off, and the rear curtain blade 32 moves to the position shown in FIG.
0m is covered and the exposure ends.

When the photographing is completed, the motor 25 is energized and the cam 22 is rotated counterclockwise to return to the position shown in FIG. 2. When the cam 220 rotates, the aperture control lever 20 also moves to the second position.
It returns to the position shown in the figure, the chrysanthemum seat 3 also rotates, and the aperture blade 2 returns to the open position. At this time, the gear 26 has returned to the position shown in FIG.
maintains the position shown in Figure 2.

In the configuration shown in Figure 3, the temperature of the aperture blade 2 is also A return to the open position takes place in the same way.

That is, when the exposure is completed, the control circuit CPU operates to suck the plunger 305, the beaded lever 301 rotates counterclockwise, and the lever 304 and the second arm 301b engage to move to the position shown in FIG. Return. With this operation, the sliding plate 302 slides to the left, and similarly to the aperture operating lever 20 described above, the rising edge 9b of the aperture lever 9 also moves to the third position.
The interchangeable lens A is returned to the position shown in the figure, and the configuration of the interchangeable lens A is returned to the open aperture position shown in FIG.

Thereafter, as shown in the flowchart in Figure 8, it is determined whether the camera is set to continuous shooting mode, but since the - frame mode is set, shooting ends, and the shooting control mode is set to shirt mode. The state returns to the state before the release RLS was suppressed. The exposure amount given in FIG. 5 is converted into an image signal of the solid-state image pickup device COD as well known in the art, converted into a TV signal by the signal processing circuit PC, and then recorded on the magnetic disk DK by the magnetic head HD. Two fields and one frame are magnetically recorded on the track.

Note that when the mode selection member EM shown in FIGS. 5 and 6 is set to the "C" position, the continuous shooting mode is determined to be YES in FIG. 8, so if the shirt release RLS is pressed or Exposure for a predetermined number of images is repeated.

(b) Photographing in aperture priority shutter speed control mode First, the aperture ring 50 shown in FIG. 2 is rotated to adjust the desired aperture value to the index 51a. Next, the display rAJ is selected and set by operating the shutter speed selection member SP shown in FIG. After turning on the camera's power switch SW, when the shirt release RLS is operated in the first stage, the photometry switch (not shown) is turned on, and the control circuit CPU makes a determination in the same way as explained in item 0. The aperture priority decision in the diagram is YES. Next, in the second stage operation of Shirt Talley RLS, SE
The signal No. 2 is turned ON, and the aperture is stopped down and the shutter is placed on standby in the same way as in No. 0. The TV value is calculated using the well-known photometric calculation formula % where % is the shutter speed, AV is the aperture value, BY is the brightness of the subject, and SV is the sensitivity of the film used or the sensitivity of the solid-state image sensor. It is a logarithmic value.

After the aperture is actually stopped down, the control circuit CPU performs photometry according to the amount of light received by the light receiving element P, and determines the TV value.

Therefore, in order to perform photometry at the actual aperture value, so-called stop-down photometry, the open aperture value and AV value are determined by the control circuit CP.
Not included in U. In this state, as shown in Figure 8,
Coil 37.4 of leading granger and trailing plunger
1 are sequentially turned off to perform a so-called electronic shutter type shutter speed control.

(2) Shutter speed priority aperture control mode Photographing frame mode selection and shutter speed selection are performed in exactly the same way as in the above-mentioned 0-term mode photographing. Also, the rAJ display of the aperture ring 50 is selected. Further, the power switch SW is turned on to put the system controller CPU1 into an operating state. In the flowchart of Figure 7,
Operate the first stage of the shirt release RLS to turn on the photometry switch (not shown), and send the signal SEI from the system controller CPUI to the exposure controller CP in Figure 6.
Send it to U2. Next, it is determined that the shutter speed priority mode is YES and the program mode is No.

In this state, in the exposure controller CPU2, AV=
BV-TV+SV is calculated and stored. In this embodiment, the angular position of the cam ring 60, that is, the angular position of the rising edge 6b, is set so that the aperture value from a fixed point is the same. It is necessary to take into account the aperture value, and the aperture value is input to the exposure controller CPU 2 as a digital electrical signal via a resistor 55 and an A/D converter. In addition, an interchangeable lens that has the same angular aperture position regardless of the aperture value, such as is used in most of the aperture metering type eye reflex cameras currently on the market. In cameras using this, there is no need to transmit the aperture value to the camera body side for exposure control, as is conventionally known.

When the aperture ring 50 is set to the "A" position as described above, the discrimination bottle 60 and the notch 5. Oc engages.

As mentioned above, with the first stage operation of the shirt taller RLS, A
The V value is calculated, and then it is determined whether the electric signal AV cam R from the resistor 17m satisfies the following equation. AV-α × Av cam R (AV+α) If this is YES, the process moves to the next step in FIG. The rotation and reversal are performed, and the servo co/h is rolled so that the above-mentioned AV-α<AV cam R (Av1α) is satisfied.

Next, in the second stage operation of the release RLS, 5E2 is turned on and the position of the rising edge 15b of the aperture control ring 15 has been determined, so the system controller CP
The diaphragm is narrowed down by the value calculated by open photometry by actuation of the motor 25 or plunger 303 in response to a signal from U2 to the rock controller CPU1. The operation of the part surrounded by the chain line in FIG. 9 is almost the same as the operation when the aperture is stopped, and the light is similarly measured in the aperture state, and the shutter speed is corrected if necessary.

As described above, the shutter speed priority aperture One-frame mode photography is performed in the control mode.

(2) Program mode photography Photography in this mode is performed by setting the display of the aperture ring 50 in FIG. 2 to "A" and the display of the shutter speed selection member SP in FIG. 5 to "A", respectively. The combination of aperture value and shutter speed to be used is stored in advance in the control circuit CPU, and determined by the conventionally known arithmetic expression AV+TV=SV+BY. For example, if AV=TV, AV
=-! -(BV+SV) may also be used. In Figure 9, 5E1ON is activated by the first stage operation of the shirt taller release RLS.
, when the program is YES, AV and TV are determined and stored by open photometry using the above-mentioned formula. The value of AV determined by the position of the aperture control ring 15, i.e. AV
As in the shutter speed priority mode, the cam R is
α (AV cam R (defined to satisfy AV + α,
By turning 5E2 ON in the second stage operation of the shirt release RLS, exposure is performed at a predetermined shutter speed and aperture. In this case as well, photometry is performed again with the aperture stopped down, and if necessary, the TV value, that is, the shutter speed is corrected and controlled.

Exposure in the program mode is performed as described above.

p) VTR (movie) mode shooting The camera shown in Figure 5 is a so-called electronic camera that records image signals obtained by a solid-state image sensor on a magnetic disk. By connecting, VTR recording becomes possible.

In FIGS. 5 and 6, the recording device VTR is first connected to the camera body B. In FIG. In the figure, a cord having a so-called pass line is connected to the control circuit CPU (system controller CPUI). With this connection, the control circuit CPU operates to send the TV signal from the image signal processing circuit PC not to the head HD but to the recording device VTR.

Next, operate the 50ft ring on camera body B to
” display to the index 51a, and the control circuit CPU can be set to the aperture control mode. Furthermore, when the mode selection member EM is set to MVJ, the control circuit CPU stands by so that the open aperture value signal from the resistor 55 and the aperture value signal from the resistor 17m are not used for photometry calculations and are switched to a so-called stop-down photometry mode. The above settings are executed by turning on the power switch of the VTR recording device.

Now, when the camera body B is turned on and the VTR is turned on, the VTR signal is sent from the system controller CPU1 to the exposure controller CPU2, and as shown in FIG. 7, the rear curtain plunger is turned on and the rear curtain is turned on. The coil 41 of the blade 32 is activated, and only the trailing blade 32 is moved from the position shown in FIG. 4 to the position where the aperture 32m is opened.

Since this is essential, this shutter open state is maintained until the power switch of the VTR is turned off.

Next, operate the operation members IREcj and “P” of the recording device VTR.
When LAYJY is pressed, the recording device VTR enters the rPAUsEJ state, that is, the standby state. The signal M is sent from the system controller CPU1 by the first stage operation of the shirt release RLM.
HI is sent to the exposure controller CPU 2, and the exposure controller 2 circuit CPU 2 rotates the motor 19 and rotates the cam 22 in FIG. 2 or the ball lever 301 in FIG. 3.
is operated to set the aperture blades 2 to a control value determined by an arithmetic expression. This calculation formula is MV=BV-AV=T
Since V-8V=C, TV corresponds to the readout speed of one field, for example, 1/60 second, and SV is constant, the exposure controller CPU2 determines the aperture value AVk according to the brightness BV of the subject. At this time, MV=BV-AY becomes a so-called aperture photometric value determined by the interchangeable lens A' and the amount of transmitted light. In this case, the exposure controller CPU 2 does not include the open aperture value in the calculation formula. Therefore, the position of the aperture control ring 15 that determines the position of the cam surface 6a is set so that the AY value determined by the amount of light transmitted through the lens matches the electric signal value from the resistor 17m determined by the aperture control/gut 5. , is determined by a so-called servo aperture method in which the motor 19 is driven and rotated.

Here, as shown in Fig. 10, it is determined whether the calculated MV value is within the range where hunting does not occur (C-α<MY<C+α), and if YES, proceed to the next step. Migration becomes possible. When a No judgment is made here, MV≧C
A determination is made as to whether C-α(MV(C+α) is satisfied or not by rotating the motor in the forward or reverse direction.

Next, by the second stage operation of the shirt release RLM, the system controller CPU 1 is transferred from the exposure controller CP.
Signal ME2 is sent to U2, r'PA of recording device VTR
U8EJ is released and VTR recording is performed on a magnetic tape (not shown). During recording, the aperture control mode is maintained, the step returns to the determination of C-α(M(C+α), and aperture control is performed in response to changes in the brightness of the subject.

When the required time or number of frames has been recorded, release the shirt release RLM and the control circuit C
In response to an instruction from the PL, the motor 19 is stopped and the motor 25 is driven, so that the cam 22 returns to the second position and stops. As a result, the aperture operating lever 20 also returns to the position shown in FIG.
b rotates, and the chrysanthemum seat 3 holds the aperture blades 2 in the open position. In the operation step, the recording device VTR returns to the 1PAUsEj state and prepares for the next recording.

Example 2 The configuration of Example 1 mechanically controls the aperture control mechanism of the interchangeable lens A by rotating the aperture ring 50 provided on the camera body B in the manual aperture control mode and aperture priority control mode. Although the aperture value is set to a predetermined value, in the second embodiment, the aperture value setting for the above-mentioned mode is handled using an electric signal.

FIG. 11 shows only the main parts of the configuration,
Except for the aperture ring 50 and discrimination pin 60 shown in FIG.
The other configurations shown in FIGS. 1, 2, and 5 are used as they are. In FIG. 11, an externally operable french value and mode selection knob 65 disposed at any position on the camera body B has a disc 66 that can rotate in one direction. The disc 66 has a number of notches 66ak corresponding to the number of aperture value numbers, and a click pawl 69 engages with the notches 66ak to hold the selected aperture value position. The disc 66 is a brush 67f! : This is the printed board 6 below the disk 66.
The selected aperture value is converted into an electrical signal by sliding on the resistor γO provided at 8.

The resistor 70 has a mode selection function, and in the manual aperture control mode, the 1゛0'' level signal is
In the automatic control mode (when soft water 1'AJ is set), a "1" level signal is input to the control circuit CPU, and the control frequency %CPυ can determine in which mode the aperture should be controlled. It is configured as follows.

In the above configuration, when the desired manual aperture value is selected by rotating the °C/° aperture value selection knob 65, the value of the resistor 70 is determined from the positional relationship between the brush 67 of the disc 66 and the resistor 70. Turn on the camera and use Shirtallize R.
The first stage operation of LS turns 5E1 ON and the program o
rWhen it comes to decision making ability to give priority to shutter speed (@Figure 7),
The step moves to step 8a in FIG. 8, where it is determined that AV upper set α<A■ cam R (AV set+α).

This platform AV set value is an AV value determined by the value of the resistor TO corresponding to the above-mentioned aperture value, and the AV cam R is
The AV value is determined by the resistance 17g determined by the position of the aperture control ring 15 which determines the position of the cam 6a. If this judgment is YES, the process moves to the next step, but if it is NO, it is further judged that AV cam R≧AV set + α, and the motor 19 is rotated in the forward and reverse direction to make the Steg AV set - α (AV cam R (Return to the judgment of AV set + α,
If the judgment is YES, proceed to the next step. This means that the manual aperture value has been set, and a determination is made as to whether or not the aperture priority control mode is set, and a negative determination is made.

By the second stage operation of the shirt release RLM, the 5E2ON signal is output, the aperture motor 25 is operated, and the aperture is stopped down and the shutter is opened and closed in exactly the same manner as in the first embodiment, thereby photographing in manual aperture control mode. will be implemented.

When shooting in the aperture priority shutter speed control mode, after selecting the aperture value using the aperture value selection knob 65, the control steps proceed in exactly the same way as in the manual mode described above, and in FIG. 8 it is determined whether or not the aperture priority mode is selected. is performed, and after YES is displayed, implementation f! I! Aperture control and shutter opening/closing are performed exactly the same as in I1.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the internal mechanism of the father conversion lens, Fig. 2 is a perspective view of the main parts of the camera body, Fig. 3 is a perspective view of a modified example of the aperture operating member, and an outline of the configuration of the camera. Figure 6 is
A schematic explanatory diagram of the configuration of the control circuit CPU shown in FIG. 5, and FIGS.
FIG. 10 is a flowchart explaining the operation of the camera according to the present invention, and FIG. 11 is a diagram illustrating the main parts of the second embodiment of the present invention. 2... Aperture blade, 3... Chrysanthemum seat, 4... Bell crank, 6... Cam ring, 15... Aperture control ring,
16...Brush, 17a...Resistor, 19...Motor, 20...Aperture operating lever, 22...Cam, 25
...Motor, 50...Aperture ring. Applicant: Fuji Photo Hikane Co., Ltd.

Claims (4)

[Claims] (1) In a camera equipped with an exposure control mechanism that performs exposure by controlling the amount of photographic light formed on a photosensitive material by an aperture and a shutter placed in the photographic optical path, a shutter control signal is sent from both circuits from the exposure control circuit. A shutter actuation piglet stage is provided for opening and closing the shutter for a predetermined period of time in accordance with the shutter release operation, and the shutter control signal of the exposure control circuit is a first step for opening and closing the shutter for a predetermined period of time determined by the exposure control circuit in the shutter release operation. a shutter control signal of the exposure control circuit, and at least a second shutter control signal that maintains the shutter in an open state during a shutter release operation; A first aperture control signal for operating the aperture actuating means to narrow down the aperture to a predetermined value each time the shutter is opened or closed by the shutter, and at least the second shutter control signal causes the shutter to be opened.Exposure control A camera with a mechanism. (2) The exposure control circuit generates a shutter control signal for the section 1 and the first aperture control signal when the stealth image recording mode is set, and generates the second shutter control signal and the first aperture control signal when the movie image recording mode is set. 2. The camera according to claim 1, wherein the camera is configured to generate an aperture control signal of 2%. (3) The exposure control circuit includes a photometry circuit that generates an output according to the brightness of the subject, and the aperture control signal or the shutter control signal is generated according to the output from the photometry circuit. Claim No. 1
Cameras listed in section. (4) The camera according to claim 1, wherein the photosensitive material is a solid-state image sensor.