JPS581131A - Automatic aperture controller and interchangeable lens of lens interchangeable camera - Google Patents

Abstract

PURPOSE:To easily perform automatic aperture control from a camera body side through a diaphragm coupling member without standardizing the relation between the extent of displacement of said diaphragm interlocking member and the number of stop-down stages with regard to all interchangeable lenses. CONSTITUTION:A means for previously storing a table of the relation between the displacement of a diaphragm interlocking member 4a and the number of stop-down stages for every interchangeable lens is provided. For actual aperture control, the conversion between the displacement of the diaphragm coupling member 4a and the number of stop-down stages is performed according to the contents of the storage means and automatic aperture control is performed through said conversion. To store the relation table, a diaphragm 4 is varied in the light from the maximum to the minimum aperture when an interchangeable lens 1 is mounted on a camera body, and then the relation between the displacement of the coupling member 4a and a current TTL photometric value is stored on a magnetic recording belt 30a momentarily.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to an automatic diaphragm control device for a camera lens [7], and more particularly to an automatic diaphragm control device and an interchangeable lens for an interchangeable lens camera camera.

BACKGROUND ART Automatic aperture control in an interchangeable lens camera is usually performed by controlling the amount of displacement of an aperture interlocking member disposed on the interchangeable lens side from the camera body side. For example, when the number of stops from the open aperture value is determined in order to achieve a predetermined aperture value on the camera body side in the aperture open state, the amount of displacement of the aperture interlocking member is controlled according to this information. Since the amount of displacement of the aperture interlocking member corresponds to the amount of change in the aperture diameter from the open position, the aperture diameter is thereby narrowed down by a predetermined number of nine stages. However, for such automatic aperture control, the relationship between the amount of displacement of the aperture interlocking member and the number of aperture stages must be standardized for all interchangeable lenses. In other words, in all interchangeable lenses, when the diaphragm interlocking member is displaced by a predetermined amount, the diaphragm must be stopped down by a predetermined number of steps corresponding to the displacement.

Therefore, if the relationship between the amount of displacement of the aperture interlocking member and the number of aperture stages differs depending on the various interchangeable lenses, aperture control such as TTI only when the aperture is open or automatic control of the aperture based on photometry results cannot be performed. .

Summary of the Invention An object of the present invention is to easily enable the diaphragm interlocking member from the camera body side without unifying the relationship between the displacement amount and the number of aperture steps of the iris interlocking member in the interchangeable lens. (7) to automatically control the aperture.

In order to achieve the purpose of the L series, the present invention is characterized by providing means for storing in advance a relational table between the displacement of the aperture interlocking member and the number of aperture stages for each of various interchangeable lenses, and in actual aperture control, this memory is used. According to the means, translation between the displacement of the diaphragm interlocking member and the number of diaphragm stages is performed for each interchangeable lens, and automatic diaphragm control is performed via this translation I2. The relationship table between the displacement of the aperture interlocking member and the number of aperture stages for each individual lens can be stored, for example, by changing the aperture once from the maximum diameter to the minimum diameter in the presence of light when an interchangeable lens is attached to the camera body. Ij ■ is possible by memorizing the relationship between the displacement of the interlocking member and the change in the TTL photometric value at that time. In addition, R O,M (Read 0
Either a built-in ROM (nly Memory) is configured to exchange signals with the camera body during aperture control, or the memory contents of the ROM of the interchangeable lens are erased when the lens is attached or at an appropriate time thereafter. If necessary, the configuration may be such that the data I7 is transferred to a storage device on the camera side.

Embodiment FIG. 1 shows a first embodiment of the present invention. (1) is an interchangeable lens, including an optical element (2) and an aperture preset ring (3).
), an aperture mechanism (4), and a bayonet (5) for attachment to the camera body. (4a) is an aperture interlocking member for operating the aperture mechanism (4), which narrows down the aperture when it moves upward in the drawing according to the bias (6). (3a) is a stopper whose position is determined according to the rotating position of the aperture preset ring (3), and the aperture is stopped until the aperture interlocking member (4a) comes into contact with the stopper (3a). It becomes.

This embodiment is an interchangeable-lens eye reflex camera in which either an automatic aperture control mode or an automatic shutter control mode can be selected by a mode switching means (not shown), and has a focal plane shutter (not shown). .

When the automatic shutter control mode is selected, the operating table operates as is well known, and its outline is as follows. That is, (7) is an aperture operating member on the camera body side, which engages with the aperture interlocking member (4a) on the interchangeable lens side when the interchangeable lens (1) is attached, and resists the biasing force (6) at the position shown in the figure. The diaphragm is opened according to a stronger bias (13). (8) and (11) C are known aperture driving means, which are interlocked with the winding of the film and charged to the state shown in the figure. (12) is a connecting member, which is long (
12a) and a pin (12b) connect the diaphragm operation member (7) and the louver (8). Now, in this state, when you manually operate the aperture preset ring (3) to set the desired aperture value, the rotating position of the aperture preset ring (3) is detected on the camera body side by a known mechanism (not shown), and the aperture is opened. Information about the planned number of refinement stages is transmitted to the camera body. On the other hand, the light (14) that has passed through the open aperture goes to a light receiving element (14) placed near a pentaprism (not shown).
5), the photometric circuit (16) logarithmically compresses the received light, and outputs the resulting value. When this output is read by the A-D converter, the output of the A-D converter (17) is first stored in the storage circuit (18). After this photometric storage operation, the first lock (10) is released by known means, and the first lever L (8) is released.
) rotates counterclockwise by the bias (8a) to pull the connecting member to the right, and rotates the aperture operating member (7) clockwise to the end of its rotation range. The aperture interlocking member (4a) is biased (
6), the aperture operating member (7) follows the above-mentioned movement, and the aperture (4) is tightened until the aperture interlocking member (4a) hits the stopper (3a) of the aperture preset ring. Since the position of the stopper (3a) is determined by the setting of the aperture preset ring, the aperture is stopped down to the set aperture value. Along with the above-mentioned narrowing down operation, a single-lens reflex mirror (not shown) is also moved up to the photographing position. After the aperture is stopped down and the mirror is raised, the front shutter curtain starts moving by a known mechanism and exposure begins. The shutter control circuit (19) includes a memory circuit (18) and a setting circuit (
Arithmetic circuit (21) that calculates the exposure time from the output of 20)
According to the output of , the trailing shutter curtain starts running when a considerable amount of time has elapsed after the leading shutter curtain had run. The setting circuit (20) is automatically inputted with the information on the number of stops transmitted to the camera body in step 17 as described above, and the film sensitivity information is also manually inputted. (However) 2. The film sensitivity information may be set in the photometry circuit (16).) When the rear curtain travel of the shutter is completed [7] When the exposure is completed, the second locking is performed by a known mechanism (not shown). (11
) is released, the second lever (9) is rotated clockwise by the bias (9a), and the second lever (8) is also rotated clockwise by being pushed by the contact portion (9b). As a result, the connecting member (12) is pushed to the left, and according to the bias (13), the diaphragm operating member (7) rotates counterclockwise to push the interlocking member (4a) and return the diaphragm to its open position. Along with the aperture return operation described above, the mirror is also raised. This completes the -th photographing operation, but when the next film is wound, the second lever (9) is rotated counterclockwise by a known mechanism in response to the next film winding. -(8) has already been locked (lO) and held [7] at the end of the aperture return operation, so the aperture drive means (8) to (11) are charged again to the state shown in FIG. You can prepare for the next shoot.

Next, the operation when the automatic aperture control mode is selected will be explained.

First, a configuration for storing the relationship between the number of aperture stages of the interchangeable lens (1) and the displacement of the aperture interlocking member (4a) will be described. (22) to (26) are preliminary narrowing drive means having the same configuration and operation as (8) to (12) described above. The two narrowing drive means are elongated holes (12
With a) and (26a), it is possible to perform the aperture drive independently without interfering with each other.The preliminary aperture drive means (22) to (26) Due to the rotation of (
For example, by receiving the rotational force of the bayonet claw (5)), it is charged to the state shown in the figure. Next, when the automatic diaphragm control mode is selected by the mode switching means, when the diaphragm preset/nodling is set to a value corresponding to the minimum aperture diameter of 1, the interlocking pawl (3b) moves to the main body side member (not shown). 7 and the third lock (23) is released.

Therefore, the third lever (22) moves counterclockwise due to the bias (22a) and pulls the aperture operating member (7), so that preliminary narrowing is performed to the minimum aperture diameter. The SLR viewfinder becomes dark when preliminary aperture is done, so you can hear the sound of the camera looking through the viewfinder to know that the camera is in this state. Also, during this preliminary narrowing down, the erase circuit (28
) operates and sends an erase signal to the magnetic field (29), which is linked to the rotation of the aperture operating member (7). Ru.

In this state, when the user presses an operation button (not shown) in the presence of light to release the fourth lock (25),
First, at the initial stage of pressing the L operation button, the A-D conversion circuit (17
) is stored in the storage circuit (18). At the same time, the counter (27) is reset to zero. Then, when the above operation button is further pressed, the fourth lock (25
) is actually released, the fourth lever (24) is rotated clockwise by the bias (24a, ), and its abutting portion (24b)
When pushed, the third lens (22) also rotates clockwise. Therefore, the connecting member (26) is pushed downward, the diaphragm operating member (7) rotates counterclockwise in accordance with the bias (13), and the diaphragm (4) returns to its open position. In the process of returning the diaphragm (4) to its open state, the output of the photometric circuit (16) is 1, and the analog value of the sum of the output of the memory circuit (18) and the output of the counter (27) is determined by the comparison circuit (32). D-A becoming
It is compared with the output of the converter (31). In the initial state where the aperture has the minimum aperture diameter, the output of the DA converter (31) is equal to the output of the photometric circuit (16). The comparison circuit (32) is
As the diaphragm aperture becomes larger, when the input ■ becomes thicker than the input ■ by a predetermined value (for example, about '/8Ev), the output is inverted (2, the one-shot circuit sends one pulse to the counter (27) in response to this. Counter When the count number of (27) increases by one, the output level of the D-person switcher (31) increases by a predetermined value (for example, 8Ev).Therefore, at this moment, the input ■ of the comparator circuit (32) becomes larger than j7 is 1°. Since the input ■ continues to increase as the aperture aperture increases, when the input ■ becomes larger than the heka ■ by the predetermined value above, the output of the comparator circuit (32) is inverted again [7 and the counter (27) The count increases by one. This is repeated, so every time the output of the photometry circuit (16) increases by 1/4 arm as the aperture diameter increases, the one-shot circuit (33) outputs -
Pulses will be emitted one by one.

This pulse is sent to the write/read circuit (34);
The magnetic head (29) records on the magnetic recording band (30a) on the stop gear (3o) which rotates in conjunction with the return of the aperture to its open state. Stop gear (3
o) is interlocked with the diaphragm operation member (7) by the gear (30b), which is integral with this, meshing with the fan-shaped gear (7a) of the diaphragm operation member (7). Therefore, the rotation angle of the stop gear (30) corresponds one-to-one to the displacement of the aperture linking member of the interchangeable lens 1. The scale is magnetically recorded every "/4Ev by the magnetic head (29). In this way, at 17, the magnetic recording band (
30a) The relationship between the displacement of the aperture interlocking member and the number of aperture stages is stored.

When replacing the lens, the fourth lever (24) is rotated counterclockwise to attach the new lens, and the fourth lever (24) is
5) is charged to the state shown in the figure, so the relationship between the displacement of the aperture interlocking member and the number of aperture stages can be stored for a new lens in the same manner as described above. Note that the memory of the previous lens will remain until you perform the above memory operation after attaching a new lens, but in automatic shutter control mode, the memory above will be set regardless of exposure control. It cannot be realized without operation, so
Attaching a new lens (automatic aperture control is performed at step 7, but the memory will always be replaced with the new one at step 1. Also, after attaching a new lens, first select the automatic shutter control mode and set the aperture preset ring. When the aperture diameter is set to the minimum aperture diameter of 1, the third lock (23) is not released and photography can be carried out as usual.

Next, photographing in the automatic aperture control mode in a state where the relationships in 7L are being stored will be described. In this mode, manually set shutter speed and film sensitivity information are input to the setting circuit (20). A-1) Converter (17
) is stored in the storage circuit (18). Arithmetic circuit (
In this mode, 21) calculates the number of narrowing stages from open based on the output of the memory circuit (18) and the output of the setting circuit (20), and instructs this to the matching circuit (35). After the above-mentioned photometry storage operation, as in the automatic shutter control mode, the first lock (lO) is released, the stop-down starts, and mirror-up starts at the same time. The stop gear (30) rotates as the aperture is narrowed down, and in response to this rotation, the magnetic head (29) reads the recorded pulse signal and sends it to the write/read circuit (34). In other words, from the write/read/read circuit (34), the narrowing down is '/a E
One pulse is output every time v advances, and this is counted by a counter (36). In other words, the displacement of the aperture interlocking member is translated into the number of aperture stages in units of "/s Ev."

When the number of aperture stages represented by the count matches the number of aperture stages commanded by the arithmetic circuit (21), this is detected by the matching circuit (35), and the aperture determining circuit (35) detects this.
37). As a result, the aperture determining circuit (37) eliminates the adsorption force of the electromagnet (38), and the stop claw (39) rotates counterclockwise due to the bias (39a) and engages the stop gear (30) [7. Stop rotation. As described above, when the number of stages of diaphragm reaches the commanded number, the trowel diaphragm is stopped and the size of the aperture diameter for photographing is determined.

When the size of the aperture diameter is determined by automatic control as described above, exposure is performed for the manually set exposure time. When the exposure is completed, the stop claw (39) is returned to the illustrated position, the second lock (11) is released, and the aperture returns to its open state.

At the same time, the mirror goes down.

In addition, in automatic aperture control, if you press the release button 17 without manually releasing the fourth lock while the third lock is released and the aperture is narrowed down to the minimum aperture diameter, the release button When pressed, the fourth lock is first released prior to the normal release operation, and the displacement of the straddle interlocking member and the number of stops are memorized. At the same time as this storage operation is completed and the aperture returns to its open state, the storage circuit (18) performs open photometry storage, and thereafter, the normal operation following the first unlocking is performed. Therefore, even if the shutter release is performed without manually releasing the fourth lock without noticing that the finder has become dark, proper automatic aperture control can be performed.

In addition, when storing the relationship between the displacement of the aperture interlocking member and the number of aperture stages, a light intensity determination circuit is provided in the comparison circuit (32), so that the output of the photometry circuit (16), which is the TTL photometry value at the minimum aperture diameter, is small. If the lower limit of the proper operating range of the comparison circuit (32) is exceeded, or conversely, the photometry circuit (16)
) is so large that it is predicted that if the aperture is opened to its maximum, the upper limit of the proper operating range of the comparator circuit (32) will be exceeded, the fourth lock (25) is prohibited from being released. However, it is desirable to ensure that the storage operation is performed in the presence of adequate light.

Next, a second embodiment of the present invention will be described. In the second embodiment, when the first release is performed in the automatic aperture control mode after attaching an interchangeable lens, the aperture is first narrowed down to the minimum aperture diameter, and during this narrowing down operation, the relationship between the displacement of the aperture interlocking member and the number of aperture stages is memorized. As this occurs, the diaphragm subsequently begins to return to its open position, and during this return operation, the above-mentioned memory is used to lock the diaphragm operation to determine the diaphragm, and then exposure is performed. After the second release,
As in the first embodiment, the aperture is determined by locking the operation of the aperture during the aperture after the release. This second embodiment has some differences in the functions or operation timings of the circuits and mechanisms, but the basic configuration is the same as the WGL embodiment, so it will be explained using FIG. 1.

In the second embodiment, when the first release is performed in the automatic aperture control mode after attaching the interchangeable lens, (22) to (2)
5) is in a charged state, this is detected and the next operation is performed. That is, A- which is the TTL open photometry value
The output of the D converter (17) is first stored in the storage circuit (18). At the same time, the counter (27) is reset to zero. After this memorization, the @3 lock (23) is released and narrowing down begins.

The output of the photometric circuit (16) during the narrowing down operation is constantly compared with the output of the DA converter (31) in the comparison circuit (32). In the second embodiment, the DA converter (31) subtracts the output of the counter (27) from the output of the storage circuit (18) by I[
]7 Outputs the analog value of the value. In the initial state of aperture or open mode, the output of the D-A converter (31) is output from the photometry circuit (
16). In addition, the comparison circuit (32) inputs a predetermined value (for example, l/8E) from the input ■ according to the narrowing down.
When the voltage decreases by a certain amount (approximately V), the output is inverted. The one-shot circuit responds by sending m pulses to the counter (27). When the count number of the counter (27) increases by one, the output level of the D-A converter (31) increases to a predetermined value (for example, l
/4EV). Therefore, at this moment, the input (2) of the comparator circuit (32) becomes smaller than the input (2). 17 or 1° The input ■ continues to decrease as the narrowing down, so when the input ■ becomes smaller than the input ■ by the predetermined value, the comparator circuit (3
The output of 2) is inverted and the count of the counter (27) increases by one. Since this is repeated, every time the output of the photometric circuit (16) decreases by nEv as the aperture is narrowed down, - pulses are outputted from the one-shot circuit (33). This pulse is sent to a write/read circuit (34), and is recorded by a magnetic head (29) on a magnetic recording band (30a) on a stop gear (30) that rotates in conjunction with the return of the aperture to its open state. It will be done.

In the case of the second embodiment, the erasing head and the writing/reading nozzle are placed adjacent to each other in the magnetic head (29).
:During the narrowing down operation, the previous memory is erased and new information is stored immediately after. In this case, due to the head arrangement space, the magnetic recording band (30a
) may become impossible to erase, but in this case, the recording of several pulses (for example, 2 pulses) in that part may be the average value of all interchangeable lenses. In addition to recording 12 in advance on the magnetic recording band as a fixed memory, the above two pulses are preset in the counter (27) before the start of narrowing down, and the portion of the magnetic recording body (30a) corresponding to the open end of the aperture is recorded. Approximate processing is possible, such as not outputting a pulse from the one-shot circuit (33) until the signal has passed the read/write head.

When the aperture diameter for recording on the magnetic recording band is reached to the minimum aperture diameter, the output of the A-D conversion (17) is taken into the storage circuit (18) again.
The stored contents are replaced with the TTL photometric value at the minimum aperture diameter. The arithmetic circuit (21) is a sentence memory circuit (
From the output of 18) and the output of the setting circuit (20), calculate the aperture value by the difference in the number of aperture steps between that aperture value and the aperture value at the minimum aperture diameter and I7, and instruct this to the matching circuit (35). . At the same time, the fourth lock (25) is released, and the diaphragm returns to the open position (7), at the same time the mirror is raised.As the diaphragm returns to the open position, the stop gear (3)
0) rotates, and in response to this rotation, the magnetic head (29) reads the recorded pulse signal and sends it to the write/read circuit (34). That is, the write/read circuit (3
From 4), one pulse is output every time the aperture returns to the open state "/, Ev, and this is outputted by the counter (
36). Then, when the difference in the number of refinement stages represented by the count number matches the difference in the number of refinement stages commanded by the arithmetic circuit (21), this is the difference in the number of refinement stages indicated by the matching circuit (3).
5), and a signal is transmitted to the aperture determination circuit (37). As a result, the aperture determining circuit (37) is connected to the electromagnet (3).
8) is demagnetized, and the slip l- and 7 claws (39) are biased (39a
) to engage the stop gear (30) and stop its rotation. As described above, when the number of stages of the diaphragm reaches the commanded number, the return of the diaphragm to the open state is stopped, and the size of the diaphragm diameter in the truncated shape is determined.

When the size of the aperture diameter is determined by automatic control as shown in F, exposure is performed using the manually set exposure time. When the exposure is completed, the stop claw (39) is returned to the position shown in the figure, so the aperture operating member (7) is biased (13).
Accordingly, the diaphragm returns to the illustrated position and the diaphragm returns to its open state. At the same time, the mirror goes down.

As described above, in the second embodiment, both the memory of the relationship between the displacement of the aperture interlocking member and the number of aperture steps, and the automatic aperture control using this memory are stored at the first release in the automatic aperture control mode after attaching the interchangeable lens. It will be done.

When the release is performed for the second and subsequent times, since (22) to (25) are not in the charged state, this is detected and the first locking (1
The automatic diaphragm control operation is performed in exactly the same way as in the first embodiment, starting from the release of 0).

Next, a third embodiment of the present invention will be described. FIG. 2 shows a third embodiment, and the same components as in FIG. 1 are given the same reference numerals. This embodiment also has an automatic shutter control mode and an automatic aperture control mode. The operation in the glossy automatic control mode is completely the same as that in the first embodiment, so a description thereof will be omitted. However, as is clear from Figure 2, calculation control is performed in analog.

Next, a description will be given of the storage operation of the relationship between the displacement of the aperture interlocking member and the number of aperture stages in the automatic aperture control mode of the third embodiment. In this embodiment, the third lock (23) is released by pressing a manual sweeping button (not shown). When the operation button is pressed, the output of the photometry circuit (16), which is the open TTL photometry value, is stored in the storage circuit (118) at the initial cut-off stage. Subsequently, the third lock is released and narrowing down is performed. During this narrowing down, the difference between the 'output of the storage circuit (118) and the photometric circuit (16), that is, the number of narrowing steps, is measured every moment by the difference measuring circuit (150). The switch (151) is interlocked with the fourth lever (24) 17 and is located on the (X) side when it is in the charging state, that is, in the storage operation. Therefore, the A-D conversion circuit (152)
RAM (Ra
(152)
Specify the address of.

On the other hand, on the stop gear (3o) that rotates as the car is tied in, there is a signal band (30C) with multiple signals drawn at equal intervals.
is provided, and each time one signal line passes through the detection section (154), one pulse is sent from the reading circuit (155) to the counter (156). Therefore, the counter (1
56), the number of pulses is counted according to the amount of displacement of the diaphragm interlocking member (4a). The RAM (152) stores the counter (1) at the time when an address is specified.
56) is taken in with the stored content at that address. In this way, by narrowing down to the minimum aperture diameter with 17, RAM (153)-
The relationship between the displacement of the aperture interlocking member (4a) and the number of aperture stages is stored in . When the diaphragm reaches the minimum diaphragm diameter, the fourth lock (25) is automatically released and the diaphragm returns to its open state, thus ending the memorization operation. Simultaneous number switch (151
) switches to the (Y) side.

Next, the photographing operation in the automatic aperture control mode in a state where the above storage has already been performed will be described.

When the shutter release is performed, the open TTL photometry value obtained by the photometry circuit (16) is stored in the storage circuit (118). The calculation circuit (, 121) calculates the number of narrowing stages from the outputs of the storage circuit (118) and the setting circuit (120),
- command to the D conversion circuit (152). A-D conversion circuit (
152) converts this from analog to digital, and stores the converted value in RAM (
153). At this time, RAM (
153) is in read [7 mode] and outputs the stored contents of the specified address to the matching circuit (157).

In other words, the commanded number of aperture stages is translated into a digital value representing the amount of displacement of the aperture interlocking member. After the above, a pulse is sent to the counter (156) every time the first lock (1o) passes the release peak (154), so the count number of the counter (156) depends on the displacement of the diaphragm interlocking member (4a). Response 1. [increase] 7 tik゛. [7] When the counted number matches the digital value output from the RAM (153), a signal is output from the -maki circuit (157) and the aperture determining circuit (37) controls the electromagnet (38). The suction force is eliminated, and the stop claw (39) is rotated counterclockwise according to the bias (39a), and the test grip (3o) is turned.
stop rotating. In this way, the aperture diameter is automatically controlled with It is possible to control using photometric values.

FIG. 3 shows a fourth embodiment of the present invention. Components that are the same as those of the third embodiment in FIG. 2 are given the same reference numerals. (200) in FIG. 3 is a ROM (Re, id 0nly Memory) that is an exact copy of the memory contents of RAM (1, 53) after performing the memory operation in FIG.
y), which is placed inside an interchangeable lens of the same type as that shown in FIG. Each interchangeable lens measures the relationship between the displacement of its aperture interlocking member and the number of aperture steps in advance (
It has a built-in ROM as shown in Figure 3 (200) that has been memorized by
, (202) It becomes possible to exchange signals with the camera body. Then, the relationship between the displacement of the diaphragm interlocking member and the number of diaphragm stages is translated unique to the interchangeable lens, thereby enabling automatic diaphragm control for the interchangeable lens.

Therefore, the fourth embodiment has no structure for storage operations. Furthermore, the operation of the automatic aperture control is completely the same as in the third embodiment, so a description thereof will be omitted.

In addition, an interchangeable lens as shown in Figure 3 was attached to the camera body as shown in Figure 2] Also, an interchangeable lens with ROM was attached to enable exchange of signals between the R, OM (200) and the camera body. Sometimes photometric RA
In place of the memory operation of M (153), the memory contents of ROM (200) are automatically transferred to RAM by attaching an interchangeable lens.
It is also possible to perform a copying operation to (153).

FIGS. 4 and 5 are circuit diagrams showing an embodiment of the third embodiment shown in FIG. First, the operation of storing the relationship between the displacement of the aperture interlocking member and the number of aperture stages will be described.

To perform I-Kiji, first press the manual operation button (not shown) in a bright place, and press the switch f (SWa) in Figure 4.
Close. After a certain period of time after the switch (sw3) is closed, the output of the timer circuit (TII) becomes "H", the flip-flop (FFI) is set, and the connection terminal (a) or "I" is set.
(”. This makes the one-shot circuit (087
) outputs an "H" pulse, and the release magnet (Mgs) operates 12 to release the third lock (23) in FIG.

On the other hand, when the terminal (al) becomes "H", the analog switch (As 3 ) in Fig. 5 is turned ON, (As l)
, (Ass) turns off, and the capacitor (CI)
Bv-+-8v-Avo is stored in . Subtraction circuit (
R1, FL3. ,Rs,R7,OA5,R+=1
3=l'js=Rt), the narrowing down has not actually started yet at this point, so (Bv-)-8v-Avo
), (By-+-8v-Avo) (7) The signal is input. Therefore, the funparator (ACI) ~(A
All outputs of Cn) are “L”, and decoder (1)B
) output is 00...0″. Also, the output of terminal (
a) becomes "H", the W/R terminal of the RAM (RA) becomes "H", the RAM (RA) enters the write state, and the data I10 becomes the input state.
When a) becomes "H", the data selector (DS) outputs the output of the counter (CO). In addition, fa)
rises to "H", the one-shot circuit (081) outputs an "H" pulse, and the delay circuit (DL+) outputs an "H" pulse after a certain period of time, and the C/ When the C/S terminal goes low, the RAM (RA) outputs the counter output "00...0" to the address "00...0" specified by the decoder (DB).
...Take in 0''.

When the aperture (AP) starts to narrow down in the above state, the output of the subtraction circuit is (By-1-8v-Avo) -(By-1-8v-A
v) = Av-Av.

As Av changes from Avo to Avm, the value gradually increases. Therefore, the comparators are (ACn), (ACn-1), .
-.(ACk) gradually becomes "High" in the order, and the output of the decoder (DE) also becomes "00...00",
It changes to "00...01", '00...10".Furthermore, it is linked to the narrowing down [7 and (30C in Figure 2)
The plate (EN) corresponding to rotates and the comparator (OA6
) corresponds to the movement of the narrowing member 1. The output of the counter (CO) indicates a value corresponding to the amount of movement.

On the other hand, comparator (ACn), (ACn-1)
– goes to “H”, the capacitor (Yn) and resistor (Zn
), (Yn-+), (Zn-+), etc., a pulse is output from the differentiating circuit, and this pulse is outputted from the OR circuit (OR3), AND (AN+), delay (DLR) - OR ( data from the counter (CO) is sequentially input to the address specified by the decoder (DE). The purpose of the delay is to prevent erroneous operation, since if the fetching operation is performed immediately when the output of the comparator changes, the address data from the decoder (I)E) will be a strange value. (
When performing a capture operation, the output of the counter changes [If it is in the middle of the acquisition, something strange will happen.] When the aperture is closed down to the minimum aperture diameter as shown in L, LLAM (I
In (A), data corresponding to the amount of movement of the diaphragm member is stored at the address position corresponding to the number of diaphragm stages (7).The circuit completes its operation, and the terminal (FOR
) resets the free knob flop (FFI). Subsequently, the fourth lock shown in FIG. 2 is released. Note that R, A
M is directly supplied with power from the power supply and retains memory. In addition, the number of stages that the compactor is reversed is 1/60r t/3
EV is sufficient.Next, the operation during photographing in the automatic aperture control mode will be explained. When the photometric null is turned on, the terminal (al) remains at "L". Therefore, the analog switch 'f (ASI) is turned on and (Asg) is turned off. 13v-I-8v-Avo and TvS from manual shutter association setting means (ST) are input (
2, Bv-+-8v -Avo-Tvs = Avx-
Av.

is output. Note that Avx is a scheduled aperture value.

Part 1. For example, the comparator is (ACn) to (AC
k+r) is “H” (ACk) to (ACI) is “L”
'', and the decoder (DB) outputs data corresponding to Avx-Avo.

The data of Avo is manually inputted by the potentiometer (VR), and the voltage of Avx -Avo -+-Avo = Avx is applied to the power meter (ME), and the aperture value Avx is displayed.

After the shutter release is performed, the switch (S
When Ws) is closed, an "H" pulse is output after a certain period of time from the timer (TI 3 force), the flip-flop operates, and the current change is the first lock (10 ).

This starts narrowing down.

On the other hand, prior to the start of the actual narrowing down,
”(Analog Sui Nochi)
) force f″OFF″ [7, By 1Sv −Avo is stored in the capacitor (C1), and the output AV of the subtraction circuit is
-Avo Gt change (tj change without 2).

In addition, the RAM (RA) operates in the Noculus of the one-shot circuit (083). At this time, since the W/R terminal it is "L", a read operation is performed, and the number of narrowing stages AVX - Avo specified by the decoder (DB) is
+ Corresponding to [7] Output the movement amount data stored in the address to data I10.

As the narrowing operation progresses, the movement of the narrowing member is counted by a counter (CO) corresponding to the amount of movement of the narrowing member, and this data is transmitted from the terminal (a) force (“L”) to the data selector (DS) (B ) and sent to the digital comparator (DC).On the other hand, the data from the data I10 is outputted from the input !
” Therefore, it is sent to the digital comparator (DC) via the gate circuit (GE), and when the two outputs match, the one-shot circuit (OS The magne throat (Mg a ) corresponding to (38) operates, and the narrowing operation is stopped.
Knob [7 and 5 Avx].

The timer (TI5) outputs a signal from the terminal (BL) to “H” after a sufficient time for the pin to invert to “H” and complete the narrowing down operation.
” pulse is output and the one-shot circuit (O8s)
The magnet (Mg t ) is rotated and the mirror knob starts.

Just before the mirror up starts, Sui Sochi (SW+) force (O
FF t, te, photometric value by aperture metering, B■+S■
-Avx is stored in the capacitor (C3). When the mirror up is completed, mechanically, the locking force of the front curtain reaches S+i,
The exposure time corresponding to the memorized value of the capacitor (C3) is counted and the magnet (Mtzs) is turned off.
The rear curtain starts running (exposure control ends at 7).

The digital parts such as photometry, display, and decoder are powered by the photometry switch, and the other circuit parts are powered by turning on the release switches (SW3) and (SWs) in FIG.

In addition, the 41st! S'l, the circuit shown in Fig. 5 releases the third lock (23) shown in Fig. 2 by pressing the manual operation button after attaching the interchangeable lens, and stores data during the narrowing down operation. , regarding the operation of automatic aperture control, see @2
The configuration is such that (8) to (12) in the figure are activated to stop the narrowing down during the narrowing down operation. [
However, if some changes are made to the circuits in FIGS. 4 and 5, the memorization operation during the return to the open aperture or the aperture operation as in the first or second embodiment in FIG. Needless to say, it is also possible to determine the aperture by stopping the aperture change during the return to the open aperture.

Furthermore, by simplifying FIGS. 4 and 5, the present invention can visualize the relationship between the displacement of the aperture interlocking member and the number of aperture stages for all interchangeable lenses, as is clear from the above. Unification (even without 2, it becomes possible to automatically control the aperture from the camera body side via the above-mentioned aperture linking member)

[Brief explanation of drawings]

FIG. 1 shows the first embodiment of the present invention. and a configuration diagram of the second embodiment, the second
The figure is a block diagram of a third embodiment of the present invention, FIG. 3 is a block diagram of a fourth embodiment of the present invention, and FIGS. 30a; 153; 200... Storage means for storing in advance the relationship between the displacement of the aperture interlocking member and the number of aperture steps in the interchangeable lens; 7... Detecting the amount of displacement of the aperture interlocking member. Detection means 21; 121... Command hand 29.30a, 34-39; 30c, 153-157 for commanding the number of refinement stages
．． 37-39; 200, 154-157.37-39
... Narrowing down position determining means. Director Minolta Camera Co., Ltd.

Claims (1)

[Scope of Claims] 1. A storage means for storing in advance the relationship between the displacement of the aperture interlocking member and the number of aperture steps for each interchangeable lens, and a detection means for detecting the amount of displacement of the aperture interlocking member; A stop-down position determining means that determines a position at which the displacement of the aperture interlocking member is stopped in executing a stop-down operation accompanying a shutter release in accordance with a command f for commanding the number of stop-down steps, and the F-recording storage means, the detection means, and the command means. What is claimed is: 1. An automatic aperture control device for an interchangeable lens camera, characterized in that the aperture control device automatically controls the apertures of various interchangeable lenses. zl- The narrowing down position determining means includes a translation means for translating the output of the detecting means into a corresponding number of narrowing steps according to the storage means every moment during the narrowing down operation, and a comparison between the translated number of narrowing steps and the number of narrowing steps from the commanding means. and a narrowing stop means that stops the displacement of the narrowing interlocking member when the numbers of narrowing stages match 17 in the 1-hitoge stage. automatic aperture control device. a The aperture position determining means includes a translation means for translating the number of aperture stages from the command means into a corresponding displacement amount of the aperture interlocking member according to the storage stage, and a translation means for translating the number of aperture stages from the command means into a displacement amount of the corresponding aperture interlocking member, and a translation means for translating the translated displacement amount and the displacement amount from the detection means. 2. The automatic diaphragm control device according to claim 1, further comprising means for comparing, and stop means for stopping the displacement of said diaphragm interlocking member when both displacement amounts match in said comparison means. 4 Preliminary aperture drive means that is charged in response to the operation of attaching the interchangeable lens and narrows down the aperture to the minimum aperture diameter in the first operation and returns it to the open aperture in the second operation, and a manual aperture □ re-ring of the interchangeable lens equipped with the above device. Interlocked with the first operation to set the minimum aperture diameter position in automatic aperture control mode 1. A first canceling means for canceling the first operation of the preliminary aperture driving means and causing the 12th aperture to narrow down to the minimum aperture diameter and foretelling the memorization preparation by darkening the field of view of the single-lens reflex finder; (7) Canceling the second operation of the aperture driving means 1. A second release means for returning the aperture to open aperture, and a second release means for returning the aperture to open aperture, and TTL photometry is carried out during the return, and the relationship between the displacement of the aperture interlocking member during the return, the change in the TTL photometry value, and the number of aperture stages that appears in (7) is memorized at every moment of the aperture diameter change. 5. The automatic aperture control device according to claim 1, further comprising a storage execution means for storing the information in the storage means [7]. As a countermeasure in the case where the first release operation is performed without the L second operation of the preliminary aperture driving means being canceled by the release means, the normal aperture adjustment is performed according to the release operation. The aperture according to claim 4, further comprising an auxiliary release means for canceling the second operation of the preliminary aperture driving means (7) and inserting a stroke for returning the aperture to an open state immediately before the operation. Automatic control device. 6. The automatic aperture control device according to claim 4, characterized in that in connection with the cancellation of the first operation of the preliminary aperture drive means, the memory in the storage means is erased. γ A first aperture driving means that is mounted on the chassis in response to film winding, and a first aperture driving means that is charged in response to attachment of an interchangeable lens,
A second diaphragm drive means that continuously stops the diaphragm and returns to the open aperture (7), and a second diaphragm drive means that releases the second diaphragm in response to the first release in automatic aperture control mode after attaching an interchangeable lens (7: the minimum aperture) a storage execution means which performs TTL photometry during the stop-down operation, and stores the relationship between the displacement of the aperture interlocking member and the number of stop-down stages appearing as a change in the TTL photometry value in the storage means every moment during the narrowing down; Yes [7. When the second aperture drive means performs the aperture, the aperture position determining means is operated during the return operation to the open state following the aperture operation to determine the aperture, and When the first aperture drive means performs aperture after the release of the shutter, -1) the aperture position determining means is operated during the aperture operation to determine the aperture. The automatic diaphragm control device described in Section 8.
A patent characterized in that information on the relationship between the displacement of the aperture interlocking member and the number of aperture stages in each interchangeable lens is stored in advance, and this information can be transmitted to the camera body when the camera body is heated. Claim 1
The automatic diaphragm control device described in section. 9. Preliminarily store information on the relationship between the displacement of the aperture interlocking member and the number of aperture stages.1. What is claimed is: 1. An interchangeable lens characterized in that the lens has a storage means for storing information, and is capable of outputting this information to the camera body when the lens is attached to the camera body.