JPS58211127A - Lens interchangeable type camera - Google Patents

Abstract

PURPOSE:To obtain a lens interchangeable type camera which allows adequate exposure by performing exposure calculation based upon data from an interchangeable lens or other data according to a mounting signal regarding the mounting of an interchangeable lens is present or not. CONSTITUTION:When the interchangeable lens 15 is mounted on a camera body, a switch LS is closed to apply a high-level detection signal through an inverter IN40, and then a terminal O2 of a microcomputer mu-COM is held at a high level. Then, data on the open aperture value of the lens 15, etc., from the variable data output part 7 of the interchangeable lens side is applied to the microcomputer mu-COM together with the output of an exposure control data output part 5 through an interface IF and a data selector MP1 to perform the exposure calculation on the basis of the data from the interchangeable lens. When the switch LS is not closed, on the other hand, the output through the interface IF is not applied and the computer mu-COM performs the exposure calculation on the basis of data other than the data from the interchangeable lens. Therefore, a lens interchangeable type camera which allows invariably proper exposure is obtained.

Description

TECHNICAL FIELD The present invention relates to an interchangeable lens camera in which exposure calculations are performed based on data from an interchangeable lens.

Conventional technology Conventionally, the aperture is set using the aperture setting ring of an interchangeable lens attached to the camera body, and the camera body obtains information on the number of aperture steps from the open aperture to the set aperture corresponding to the setting position of this aperture setting ring. An interchangeable lens camera is known that obtains exposure time information based on information on an aperture metering value corresponding to the intensity of light from a subject passing through an open aperture of an interchangeable lens, information on film sensitivity, and information on the number of steps of aperture reduction. By the way, in this type of camera, when the interchangeable lens is not attached to the camera body, such as when an interchangeable lens is attached via a lens adapter such as an intermediate ring or bellows, the number of aperture reduction steps mentioned above is Since this information cannot be obtained on the camera body side, the exposure time information is calculated based on the photometric value information according to the intensity of the subject passing through the set aperture of the interchangeable lens and the film sensitivity information by setting the number of aperture stops to zero. obtain. Therefore, exposure calculations are performed based on different photometry methods, such as wide-open photometry or stop-down photometry, depending on whether a lens is attached or not. When attaching an interchangeable lens to the main body of this l-like interchangeable lens camera, if the lens is attached to a position other than the specified attachment position, the information on the number of aperture steps may be input incorrectly, resulting in exposure calculation. There was a problem in that the exposure time was calculated and was not properly exposed.

In addition, an exposure calculation mode switching means is provided to switch the exposure calculation mode according to the setting position of the aperture setting ring of the interchangeable lens, and the aperture aperture is automatically determined when the aperture setting ring is in a predetermined lock position. There is a known interchangeable lens camera that performs a false exposure calculation and sets the aperture aperture to a preset value if the aperture setting link deviates from this predetermined position. Note that this type of camera switches the exposure calculation mode according to the set position of the aperture ring, and does not propose the idea of switching the exposure calculation mode according to the attachment of an interchangeable lens. This type of camera also has the same problems as the above-mentioned type of camera.

Furthermore, there is a method in which information on the maximum aperture value is manually input from an interchangeable lens, and exposure calculation is performed from this information on the maximum aperture value and information on the photometric value obtained by metering the maximum aperture.

With such a camera, if an interchangeable lens f is not attached to the camera body, the maximum aperture value or a predetermined value (for example, F
5, 6), and exposure calculation is performed based on this open aperture value and photometric value. At this time, if the open aperture value of the interchangeable lens is a value other than the predetermined value, an inappropriate exposure calculation is performed. Therefore, in this method, there is a problem that if exposure control is performed based on a value calculated when no interchangeable lens is attached, inappropriate exposure will result.

On the other hand, terminals for electrically transmitting information about the interchangeable lens from the interchangeable lens to the camera body are provided on the interchangeable lens side and the camera body side, and whether the terminal on the interchangeable lens side and the terminal on the camera body side are connected or not. A method has been proposed that detects the connection and locks the camera release when it is not connected.

However, this type of camera has a problem in that when an interchangeable lens without a data terminal is attached, information about the interchangeable lens cannot be obtained from the camera body, making it impossible to take pictures.

Purpose The present invention provides an interchangeable lens that can be worn in any condition.
The purpose of the present invention is to provide an interchangeable lens camera that can perform appropriate exposure calculations.

SUMMARY OF THE INVENTION In the interchangeable lens camera according to the present invention, for example, when an interchangeable lens is attached directly to the camera body, when the interchangeable lens is correctly attached to the camera body, data obtained from the interchangeable lens is used, and the exposure of the camera is adjusted. Calculation is performed, and when the interchangeable lens is not installed or is not installed correctly, exposure calculation is performed according to data other than the lens data, such as data obtained from the camera body.

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

In FIG. 1, the circuit (BD) on the left side from the single-point chain MA is a circuit provided on the camera body side and the flashlight emitter side.
The circuit (LE) on the right side of the dashed-dotted line B is a circuit provided on the interchangeable lens side.

Regarding the circuits (BD) on the camera body side and flash emitter side, is (1) the camera's exposure control? MJK is a microcomputer that calculates the necessary data.

(3) is an exposure control abrasive part, and a microcomputer (1
) The aperture and exposure time are controlled based on the data output from the camera.

(5) is an exposure control data output unit that inputs various data obtained from a setting aperture υ signal output device, an exposure time signal output device, etc., which will be described later, provided on the camera body to the microcomputer (1); Data selector (M
input to the microcomputer (1) via the PI).

(7) is the data output section on the interchangeable lens side, which includes fixed data of the lens such as open aperture value and maximum aperture value, and shooting distance data and focal length data obtained through variable data output section (9). The OJ change data of the lens is sent to the interface (IF) on the camera body side.

Note that (15) is the interchangeable lens body, (11) is the aperture setting ring of the interchangeable lens (15), and (13) is driven according to the output of the microcomputer (fl) to control the amount of aperture of the camera body. It is an aperture ring.

Note that (LS) closes when the interchangeable lens (15) is attached to the camera body (not shown) and locked in a predetermined position.
This is a switch that detects when an interchangeable lens is attached to the camera body, and the output signal of this switch (LS) is manually input to the microcomputer (1) on the camera body side.

- Also, as will be described in detail later, when the interchangeable lens is attached to the camera body, the data selector (MPI) receives the interface circuit (IF) signal, that is, the data from the interchangeable lens side and the exposure control data output section ( 5), that is, the data from the camera body side, is transferred to the data bus (D
When the interchangeable lens is not attached to the camera body, the data from the exposure control data output section (5) is output to the microcomputer (1) via the data bus (B).
DB) to the microcomputer (1).

The circuit shown in FIG. 1 will be described in further detail below.

As shown in Figure 1, when the battery (BA) is installed in the camera body, the power supply circuit (PS) connects the power line (+E) to the microcomputer (1), the oscillator (O3C),
Display section (DP'), interface circuit (IF), data selector (MPt), inverter (INl) to (
INs) and (IN40), and AND circuits (AN
o). In addition, the power supply circuit (PS) is connected to a battery (B
When A) is attached to the camera body, a reset signal (PRl) is output from the power-on reset circuit (POl), and this reset signal (PRl) is manually input to the reset terminal (RE) of the microcomputer (1). .

The oscillator (O3C) outputs a reference clock pulse (CP), and this clock pulse (CP) is input to the clock terminal (CL) of the microcomputer (1) and the clock input terminal of the circuit described later, and synchronizes the operation of the circuit. is taken.

The display unit (DP) displays exposure control values, shooting modes, warnings, etc. based on signals output from the segment terminal (SEG) and common terminal (COM) of the microcomputer (1).

In the exposure control section (3), a microcomputer (1
) The calculated exposure time data or set exposure time data Tv output to the output port (OPl) of The time until closing 2-TV is created based on the clock pulse (CP) and data Tv, and the exposure time is controlled accordingly.
The calculated refinement stage number data or the set refinement stage number data Av, -Av. ' is manually input to the aperture control device (CA) of the exposure control section (3).

This aperture control device (CA) counts pulses input from a pulse generator (PG) that outputs a number of pulses corresponding to the rotation angle of the aperture ring (13) of the camera body. When the lens (15) is attached to the camera body, the above-mentioned aperture ring (13) protrusion (18a)
) comes into contact with the aperture bottle (15a) of the lens (15), the aperture bottle (15a) rotates by the same amount as the amount of rotation of the aperture ring 18), and the aperture of the lens is adjusted by this aperture bottle (15a). It is narrowed down by the amount of rotation. Therefore, the pulse generator (PC,) outputs a number of pulses corresponding to the number of narrowing stages. In the aperture control device (CA), when the aperture limit stage number data Av - Avo' inputted from the microcomputer (1) and the pulse count value match, the aperture ring (
13) Stop the rotation and automatically open the diaphragm tWIJ? 8
I will do it.

The exposure control data output section (5) includes a photometry circuit (ME) that performs 'r T L open center focused average photometry, and data Bv -AVO representing the n degree of the subject output from this photometry circuit (fVIE). A-D converter (AD) that converts analog quantity into digital quantity and aperture stage number data A according to the setting position of the lens aperture setting ring (11)
Setting to output v s A v o' = r signal output device (AS) and exposure time signal output device to output data corresponding to the exposure time manually set by the exposure time control device (not shown) of the camera body (TS), a film sensitivity signal output device (SS) that outputs data corresponding to the film sensitivity manually set by a film sensitivity setting member (not shown) of the camera body, and a shooting mode setting member (not shown) of the camera body. ) or a flashlight emitting device (to be described later), which is composed of a mode signal output device (MS) that outputs data corresponding to the flash photography mode based on a charging completion signal of the main capacitor (not shown) of the FIj. Note that the detailed configuration of the aperture setting signal output device (AS) will be described later.

When the terminal (0□) of the microcomputer (1) becomes "High", the interface circuit (IP) reads various data from the interchangeable lens (LE) attached to the camera body, and when the data reading is completed, Depending on the data output from the output port (O20) of the microcomputer (1), the read data is transferred to a data selector (MPl) (described later) and the microcomputer (
1) is input to the microcomputer (1) via the external data bus (DB). Note that the detailed configuration of this interface circuit (IF) will be described later.

The data selector (MP) is the output port (O2) of the microcomputer (1) that is applied to the selection terminal (SL).
0), the input terminals (IPl) to (IF
6) Transfer any of the human data to the data bus (DB”)
Output to. The data from the interface circuit (IF) is input to the input terminal (IPl) of this data selector (MPl), and the data output section for exposure control ( 5) A-D converter (AD), setting film signal output device (AS), exposure time signal output wave d ('I'S), film sensitivity signal output device (SS), mode signal output device ( M
Data from S) are respectively input.

The relationship between the data applied to the selection terminal (SL) of the data selector (MPl) and the data output to the data bus (DB) is as shown in Table 1. When the data is Table 1 Hexadecimal table z OH", it is the exposure time data Tvs of the input terminal (IF4). Similarly, when it is "H", the film sensitivity data Sv of the input terminal (IP5) is "2H". When the mode data from the input terminal (IP6) is “”H
”, the photometric value data from the input terminal (IF2),
・Knowledge. Next, the setting narrowing stage number data Avs-Ayo' from the manual terminal (engineering P3) is transferred to the data bus (DB).
and input into the microcomputer (1). Microcomputer (1) output port (O
When the data of 20) is "5H" to "cH", the data from the interface circuit (IF) input to the input terminal (IPl) of the data selector (MPl) is output to the data bus (DB). In this case, the interface circuit (IF) controls the data "5H" to "C" output to the output port (O20) of the microcomputer (1).
Data corresponding to each data of H'' is output to the data bus (DB) via the data selector (MPl).Also, when an interchangeable lens is not attached to the camera body, there is a switch (LS) that detects the attachment of the lens. is open, the input terminal (i4) of the microcomputer (1) is "l, o".
w” and output port (O20) has 'oH' to '3H'
Only data related to the lens is output, and lens-related data is not read into the microcomputer (1).

(MS) is a photometric switch, and this photometric switch (f
When Vls) is closed, the output power of the inverter (INl) becomes "High", and the input terminal (11) of the microcomputer (1) becomes "High", and the microcomputer (1) is used for exposure control. Data reading, A-D conversion of photometric data, exposure calculation, and display operations are started. In addition, when the photometry switch (MS) is closed, the power supply transistor (BTl) becomes conductive, and the power supply line ( +VB). Furthermore, when power supply starts from the power supply line (+VB), a reset signal (PH1) is output from the q-war-on reset circuit (PO2), and this reset signal (PH1) is transmitted to the above-mentioned exposure time control device (CT). and the throttle control device (CA) to reset each one manually.

The switch (LS) that detects when a lens is attached to the camera body is closed when the interchangeable lens is attached to the camera body and locked.
The output of the N40) is set to "High", the input terminal (I4) of the microcomputer (1) is set to ")iii", the microcomputer +1) reads the information from the interchangeable lens, and the interchangeable lens is connected to the camera. When attached to the main body, the first exposure calculation operation can be performed. Also, if the lens is not attached to the camera body and the switch (LS) is left open, the microcomputer (1
) when the input terminal (I4) of It becomes possible to do this.

(R8) is a switch that is closed by the release operation;
(C8) is a switch for preventing unintentional exposure that is closed when film winding is completed and opened when exposure control operation is completed. The positive power supply side terminal of the release switch (R8) is connected to one input terminal of the AND circuit (ANo) via the inverter (IN3), and the positive power supply side terminal of the accidental exposure prevention switch (C3) is connected to the inverter (IN4). The other input terminal of the AND circuit (ANo) and the microcomputer (
1) are respectively connected to the input terminals (I2). Furthermore, the output terminal of the above-mentioned AND circuit (ANo) is connected to the interlaced terminal (iρ) of the microcomputer (1).

When the film winding is completed, the switch (C8) is closed, and when the release operation is in line 7 and the switch ('R5) is closed, an interband is applied to the microcomputer (1), and the exposure calculation operation is started immediately. It becomes possible for something to be done.

The output terminal (01) of the microcomputer (1) is set to "High" when starting the exposure control operation, and the release circuit (RL) to which this output terminal (01) is connected is connected to the exposure control mechanism (not shown). Perform the release operation.

Also, the output terminal (01) of the microcomputer (1)
is connected to the base of the power supply transistor (BT) via an inverter (IN2) and a resistor, and even if the photometry switch (MS) is opened during exposure control operation, the transistor (B
Tl) maintains the power supply state. Microcomputer (
1) output terminal (02) is an interface circuit (IF
) is connected to the base of the power supply transistor (BT2) via the inverter (IN5) and resistor, and the output terminal (02) of the microcomputer (1).
When becomes 'High', the power supply transistor (BT2
) is conductive and the power line (+VB) is connected to the power line (+VB).
Power is supplied to the lens side circuit (LE"l) through the camera body side terminal (JBl) and lens side terminal (JLl), and the interface circuit (IF
) data from the data output section (7) on the lens side is read through the lens side terminal (IF3) and the camera body side terminal (IF3).

A flashlight control device (FC) that controls the flashlight device (FL) from the camera body side is provided on the camera body side, and a light emission start signal output from the flashlight control device (FC) is sent to a terminal (on the camera body side). IF6), the flash light emission stop signal is input to the flash light emitting device (FL) through the flash light emitting device side terminal (IF2), and the light emission stop signal output from the flash light emission control device (FC) is input to the camera body side terminal (IF7). , the flashlight emitting device (
FL). In addition, this flash light emission control device (F
In C), a light receiving section is installed near the film surface to receive the subject light that passes through the lens aperture and is reflected on the film surface, and integrates the light reflected from the film surface caused by the flash light emitting device (FL). A so-called film surface photometry circuit (not shown)
is built-in. The light emission start signal is output, for example, when the shutter is fully opened, and the light emission stop signal is output, for example, when the integral value of the reflected light from the film surface due to light emission from the flash light emitting device (FL) reaches a predetermined value. Also, when the charging voltage of the main capacitor (not shown) of the flashlight emitting device (FL) reaches a predetermined value, a charging completion signal is sent via the terminal (JF) on the flashlight device side and the terminal (IF5) on the camera body side. It is input to the mode signal output device (MS') of the exposure control data output section (5). After outputting a charge completion signal to the mode signal output device (MS), the flashlight device (PL) starts the xenon tube (not shown) to emit light when a light emission start signal from the flashlight control device (FC) is input. start,
When a light emission stop signal is input from a flash light emission control device (FC), light emission of the xenon tube is stopped.

The data output section (7) of the lens side circuit (LE) receives a clock pulse (
CPL) is input via the camera body side terminal (IF2) and lens side terminal (IH2). Also, between the interface circuit (IF) and the data output section (7).

A ROM (ROl), which will be described later, is built into the data output section (7).
) and the interface circuit (I
The ROM (ROl) address data output from F) is connected to one signal line (SB') and the camera body side terminal (
IF3) and the lens side terminal (IH3) using the clock pulse (CPL) as a synchronizing signal. Note that the detailed configuration of the data output section (7) will be described later.

The variable data output unit (9) of the lens side circuit (LE) outputs shooting distance information that outputs data on the amount of movement from the reference position to the set position corresponding to the closest shooting distance of the shooting distance setting device (not shown). The focal length information output device (FS) outputs data on the amount of movement from the shortest focal length position of the focal length setting device (not shown) of the zoom lens to the set focal length position. . This shooting distance information output device (DS) and focal length information output device (FS')
) output data is stored in the ROM (ROl) of the data output section (7).
) is input to the data output unit (7) as address data, and data representing the absolute value of the set shooting distance and data representing the absolute value of the set focal length are output from the ROM (ROl) according to the above address data. . In addition, the shooting distance information output device (DS) and the focal length information output device (FS)
) The detailed configuration of the setting aperture signal output device (AS) will be described later.
).

Next, the operation of the microcomputer (1) shown in FIG. 1 will be explained based on the flowchart shown in FIG.

In step +1, the photometric switch (MS) is closed and the input terminal (il) of the microcomputer (1) is
It determines whether the input terminal (il
) is "High", the process moves to step≠6 and the timer register (TR) of the microcomputer is reset. Next, in step +7, the lens is attached to the camera body, the switch (LS) is closed, and the input terminal (i4
) is 'High' and input terminal (i4
) is 'High', the process moves to step #8 and the output terminal (02) becomes 'High'.On the other hand, the lens is not attached to the camera body and the input terminal (i4) is 'LOW'.
If so, proceed to step +9, set 11111 in the 1-bit status determination register (JF), and proceed to step #
Move to 10. At step ≠ 8, the output terminal (02) is
When the river becomes gh, the output of the inverter (IH5) becomes u
When I, ow +i, the transistor (B10) becomes conductive and power supply to the lens side circuit (LE) starts, and at the same time, the interface circuit (IF) starts reading data from the lens and goes to step #10. Transition.

The output terminal (03) becomes "'High" at step ≠ 10, and the output terminal (03) becomes "l, 0W" at step ≠ 11.
Becomes 11. The signal from this terminal (03) is input to the AD converter CAD) of the exposure control data output section (5), and AD conversion of the photometric data output from the photometric circuit (ME) is started. Then, in step≠12, the data is stored in the register (DR) as data "01(', -, +13j
and send this data “oH” to the output port (OF2).
Output. This data ``'OH'' is the data selector (
As mentioned above, the data selector (MPl) selects the exposure time data given to the input port (IF4) from the data bus (DB
), and this exposure time data Tvs is read into a predetermined register of the microcomputer (1). Furthermore, in step '#15, 1 is added to the contents of the data register (DR), and in step ≠16, 1 is added to the contents of the data register (DR).
) has become '48', and if the content of the data register (DR) has not become '4H', the process returns to step≠13 and the content of the data register (DR) has become '4H'. Step +, 13, ≠14.≠
Repeat step 15. When the content of the data register (DR) is "IH", this data "IH" is input to the selection terminal (SL) of the data selector (MP1'), and as mentioned above, the data selector (MPl) (I
The film sensitivity data Sv given to F5) is output to the data storage (DB), and the microcomputer (1) reads this film sensitivity data Sv.

Similarly, the contents of the data register (DR) "2H
”, the mode data is microcomputer (1)
It can be loaded into the page. Step #10 above. ≠11
After a pulse is output to the output terminal (03) and A-D conversion of the photometric data is started, when the content of the data register (DR) becomes “3H” and the process moves to step≠13, the photometric data is The time required for A-D conversion has elapsed and the A-D conversion has already been completed. Therefore,
At step≠13, data is sent to the output port (O20).
The photometric data BV-Ay which is converted into a digital value is output and given to the manual port (IF2) of the data selector I'MP.

is connected to the microcomputer (
1) Read the appropriate size. Then, in step +-15, the contents of the data register (DR) become "4H", and the process moves to step ≠17.

At step +17, a 1-bit register (JF') is used to determine whether or not a lens is attached to the camera body.
Determine the content of. If the lens is not attached and the switch (LS) is open, the content of the register (JF) is "1" at step +9, and the value of step +1 is
The process moves to the second exposure calculation operation in the case where the lens is not attached following step 4P18, and the operations after this step 4P18 will be described later.

If the lens is attached to the camera body, i.e.
If the contents of the register l'JF) are "0" at step +17, the process moves to step +20 and the data "4H" which is the contents of the data register (DR) at this time is transferred to step +20.
is output to the output port (O20). Here, the data selector (MPl) outputs the setting refinement stage number data Avs-Avo' given to the input port (P3) to the data bus (DB), and in step +21, this setting refinement stage number data Avs-Avo' is It is read into the computer (1). Further, in step ≠22, "1" is added to the contents of the data register (DR) to set the contents of the data register (DR) to '5H', and the process moves to step '#23.

While the operations from step +8 to step≠22 described above, that is, the operation of reading data output from the exposure control data output section (5) into the microcomputer (1), the interface circuit (IF )
From signal line (SB), terminal (IF3).

The address data of the ROM (ROl) is serially transferred to the data output section (7) of the lens side circuit (LE') via (IF3), and then the address data of the ROM (Rol) of the data output section (7) is transferred to the data output section (7) of the lens side circuit (LE').
The operation of serially transferring fixed data of the lens from the ink-face circuit (IF) to the ink-face circuit (IF) via the terminals (IF3), (IF3), and the signal line (SB) is repeated. When the transfer of the fixed data from the lens side circuit (LE) is completed, the shooting distance information output device (DS' ) and the distance from the reference position output from the focal length information output device (FS) to the set position dimension 1υ! The set shooting distance information and the set focal length information represented by a mouse are input to the data output section (7) as address data, and are stored in the ROM (ROl) by addressing the ROM (RO) of the data output section (7). Data representing the absolute values of the set shooting distance information and the set focal length information are serially transferred from the lens side circuit (LE) to the camera body side interface circuit (IF) via the signal line (SB).

From the lens side circuit (LE) to the interface circuit (IF
) When the data transfer to the ink-face circuit (IF) i, j is completed, the terminal connected to the input terminal (i3) of the ink-face circuit (IF) i, j is set to 'High' and the data from the lens is The reading operation is stopped.Meanwhile, in step≠23, the microcomputer (
1) determines that the input terminal (i) has become "High", the process moves to step +-24 and the output terminal (0
2) to “LOW” and connect the 1-transistor (BT) for power supply.
2) by making the power supply line (10 VL
) to the lens side circuit (LE) is stopped.

To summarize the transfer and reception of data when reading data from the data output section (7) of the lens mentioned above to the interface circuit (IF) of the camera body, first, specify the address of the ROM (ROl) on the lens side from the camera body. Data is transferred via the signal line (SB), and fixed data corresponding to this address data is stored in the lens side ROM (R
O, ) to terminal (JL, (JB3) and signal line (SB
) to the camera body interface circuit (IF)
The operation of transferring to Once the transmission of fixed data from the lens to the camera body is complete, the variable data output section (comprised of a code plate etc. on the lens side)
9) The address of the ROM (RO,) is specified using the set shooting distance information and the set focal length information, and the ROM (R
The absolute value data of the set photographing distance information and the set focal length information stored in the camera body is transferred to the interface circuit (IF) of the camera body via the signal line (SB).

With the above configuration, the terminals for fixed data transfer and variable data, ie, setting data transmission, can be shared, and the number of terminals can be reduced.

The setting information output section, which is composed of a code board, etc., inputs data corresponding to the relative movement amount from the standard M position to the set position into the ROM as address data, and from the ROM specifies the address data specified by the above address data. The data representing the absolute value of the setting information stored at the specified address will be output.
Compared to the case where the absolute value of the setting information itself is output by the code plate, the number of bits is smaller, and the area of the code plate can be reduced. Furthermore, the timing is alternately set to serially transfer the lens ROM hair address data from the camera body to the camera body via one signal line, and then serially transfer data from the lens ROM to the camera body.
This has the effect of reducing the number of electrical contacts for data transfer between the camera and the lens.

From the lens side circuit (LE') to the interface circuit (I
When the data transfer to F) is completed and the input terminal (i3) of the microcomputer (1) becomes "High", the data "5H" which is the content of the data register (DR) is transferred to the output port at step ≠25. (OP3), and this data “5H” is output to the interface circuit (OP3).
IF), and among the data transferred from the above lens from the interface circuit (IF), this data "5H"
” is output and the data selector (MP
) is input to (IPl). Also, the output port (OP3) of the microcomputer (1)
) data "5H" is manually input to the selection terminal (SL) of the data selector (MPl), and the data selector (MPl) manually inputs the data of the interface circuit (IF) given to the board (■P1) to the data bus ( DB), and the data on this data bus (DB) is read into the microcomputer [1] at step +-26.

Furthermore, in step +27, the data register (DR) is
1” is added and the contents of the data register (DR) become “6H”. At step +28, the data register (D
It is determined whether the contents of the data register (R) are 'DH'. Since the contents of this Toki data register (DR) are not 'DH', the process returns to step +25 again, and from then on, the data register (DR) is
Step ≠ 25 until the content of DR) becomes “D H,”
, ≠26, +27 are repeated. in this case,
The output port of the microcomputer (1) (when the OP data is "5H", the interface circuit (IF)
The data read into the microcomputer (1) is check data.

Similarly, when "6H", open aperture value data A
%IO', when "7H", maximum aperture υ value data Av
m, when “8H”, open aperture error data ΔAyo,”
9 H" is the shortest focal length data, "AH" is the longest focal length data, "BH" is the set shooting distance data, and "cH" is the set focal length data. Microcomputer + 1) When all lens data from the interface circuit (IF) is read in and it is determined in step 4P28 that the contents of the data register (DR) have become 'DH', step ≠29
to move to.

When transferring data to the lens color microcomputer (1), the interface circuit (IF) from the lens
Each data is serially transferred to the interface circuit (
IF), each data is latched as parallel data. Then, in response to a data designation signal output from the microcomputer (1), each piece of data latched by the interface circuit (IF) is sequentially read into the microcomputer (1) in parallel. Furthermore, while the lens data is being read into the interface circuit (IF) as described above, the microcomputer reads other data, that is, output data from the exposure control data output section (5). With this configuration, compared to reading data serially into a microcomputer using the serial input port of the microcomputer,
This has the effect of shortening the data loading operation time.

In step #29, among the data read from the lens to the microcomputer fl> via the interface circuit (IF), data that is always input when a lens is attached to the camera body, that is, check data is input. It is determined whether there is a This check data is the first data sent from the lens, as will be described later, and is the same regardless of the type of lens. If it is determined that this check data has been input, the process moves to step≠30, and if it is determined that the check data has not been input, step≠
Move to 18. This check data is not input when the lens is not attached or when an accessory such as a bellows is attached between the lens and the camera body.

In step≠30, the open aperture value data Avo' and the open aperture error data ΔAv are read from the lens.

Based on.

AVO'+ΔAvIO=AVO (1) is performed to calculate the open aperture value Avo of the lens.

Then, in step +31, it is based on the A-D converted subject brightness data By-A4 and the open aperture value data AvO calculated in step ≠30.

(BY − Avo ) + Avo = Bv −
f2) is performed to calculate subject brightness data BV, and the process moves to step +-32.

At step +32, exposure calculation is performed in accordance with the exposure control mode data read into the microcomputer (1), and the contents of the exposure calculation in each mode will be explained below.

First, in the program mode in which both the aperture value and exposure time are automatically and uniquely determined for the exposure value Ev, calculate the following, and in the aperture priority exposure time automatic control mode, In the case of exposure time priority aperture automatic control mode, perform the calculation of (9), and in the case of manual setting mode, perform the calculation of (9). In addition, if the aperture value or exposure time calculated in each automatic exposure control mode of the above program, aperture priority, or exposure time priority is the control limit value, the settings will be reversed based on this limit value. The exposure time or aperture value is calculated. In addition, in the flash photography mode, the following calculations are performed. Here, I■ is the apex value corresponding to the maximum light emission amount of the flash photography device, Dv is the apex value of the shooting distance based on the set shooting distance data from the lens, and T
vf is the apex value of the exposure time of the flash tuning limit.

Then, the magnitudes of A·vfl and A y f 2 are compared, and if A·v f 1≦A vf 2.

Av f 1A VO' AYft>AVif2f6reha.

The narrowing depth value of Avf - Avo' is calculated. The aperture of the lens is controlled according to one of these aperture stop values, but as mentioned above, the amount of light emitted by the flash light emitting device (FL) depends on the amount of light that passes through this aperture and is reflected on the film surface. controlled based on here.

The aperture value A v f 1 is an aperture value that is smaller than the appropriate aperture value determined by EV and "fv+E" by αE・V (for example, 1EV), but EV is determined by center-weighted average metering. Therefore, during normal daytime synchronization shooting, the secondary subject will also be in a state close to the proper exposure, and the main subject will have the proper exposure by controlling the amount of flash light emitted by film surface metering.On the other hand, Avf 1 is Avf2
If the value becomes too large, if the aperture is controlled by Avfl, the amount of flash light reaching the subject from the flash light emitting device will be insufficient, increasing the possibility that the amount of exposure will be insufficient. That's right there
The aperture is controlled based on Avf2 to control the main subject to proper exposure.

After performing the above calculation operation, the microcomputer (1) outputs display data such as the exposure control value, exposure control mode, warning, etc. to the display unit (DP) based on the calculation result in step 4P33, and then performs the calculation in step 4P33. 41=34.

On the other hand, if step temple 29 determines that the check data from the lens is not manually input, step temple 1
8, the calculation operation at step +18 will be explained below. Note that, as described above, if it is determined in step +17 that the contents of the register (JF) are it 1 u and the lens is not attached, the process also moves to step ≠18.

First, when automatic exposure control modes such as program mode, aperture-priority automatic exposure time control mode, and exposure time-priority automatic aperture control mode are set, the photographer wants the correct exposure to be achieved automatically. Therefore, let Avn be the effective aperture value at this time.

The output of the photometric circuit (ME) is.

BM-AVn It becomes. Therefore.

(Bv − Avn ) + Sv, = TM −=
f8) An extension is performed and the exposure time is controlled using the calculated value TV. On the other hand, the aperture outputs a value in which the number of stages of aperture is zero, and no aperture is performed. That is, the exposure time is automatically controlled using the TTL aperture metering method. On the other hand, in the manual setting mode, the exposure time is controlled by a manually set value, the number of stops is output as zero, and no narrowing down is performed. In the case of flash photography mode, the exposure time is controlled by the flash synchronization limit value Tv[, the number of stops is outputted as zero, and the amount of flash light emission is controlled by the above-mentioned film surface photometry and film sensitivity.

After performing the above-mentioned calculation operation, the microcomputer (1) displays display data such as the exposure side (goods) value, exposure control mode, warning, etc. on the display unit (DP) based on the calculation result in step +19. Output and move to step≠34. In this case, information on the aperture value of the lens is not provided to the camera body, so it is impossible to display the aperture value on the camera body, and the aperture value is not displayed.

The microcomputer (1) outputs the exposure time control data 1'' from the output port (OPl) to the exposure time control device (CT) of the exposure control section (3) in step +34.
Data for controlling the number of narrowing stages A%1-A at step≠35
vo' from the output port (O20) to the aperture control device (CA
). Then, in step +36, the interconnected terminal (+1) becomes "High" to enable transition to the interwoven operation, which is started, and furthermore, in step +37, the contents of the register (JF) are changed.
” and return to 5tart.Here, enabling the transition to interwoven operation means that the interconnected terminal (
The acceptance of interwoven signals into io is to enable input.

The microcomputer (1) returns to 5tart, the photometric switch (MS) remains closed, and the input terminal (11) is "'" (i g h
”, the operations from step +6 to step 37 described above are repeated as long as the photometry switch (MS') is closed. On the other hand, the operation of the microcomputer (1) is When the metering switch (MS) is returned to 9. If the input terminal (11) is "Low", the process moves to step ≠ 2 and the contents of the timer register (TR) are changed. A determination is made as to whether the constant value J:p is large.If the contents of the timer register (TR) are also small, Kj!7;
The process moves to step ≠ 3, "1" is added to the contents of the timer register (TR), and the process moves to step ≠ 7. From then on, the operation in step +371 described above, that is, data reading, calculation, and display, is performed, and the process returns to 5tart. When the contents of the timer register (TR) become larger than K, steps ≠ 1, +2, +3, and the operations from step 7 to step +37 can be repeated. When it is determined in step ≠ 2 that the contents of the timer register (TR) have become larger than K, the process moves to step +4 and outputs blank display data in which nothing is displayed on the display section (DP'l). Then, in step ≠ 5, the reception of interwoven signals at the interwoven terminal (io) is stopped, and after that, the photometry switch (MS'
) is closed and the input terminal (11) becomes ")(high"), the operations of steps ≠2.≠4.≠5 can be repeated.

To summarize the operation of the microcomputer i1) mentioned above, while the photometric switch (MS) is closed, data reading, calculation, and display operations are repeated, and then the photometric switch (MS) is opened. However, for a certain period of time (when the contents of the timer register (TR) change from 0 to +1), the data reading and calculation 1 display operations are repeated in the same way, and the photometry switch (MS) is opened and the value remains constant. When time elapses (the contents of the timer register (TR) become +1), the above-mentioned operation is no longer performed. Here, this certain period of time is, for example, about 15 seconds.

When the photometry switch (MS) is closed and the first arithmetic operation is completed, it becomes possible to receive the interwoven signal of the interwoven terminal (i-).Then, when the film winding is completed and the accidental exposure prevention switch ( When the release switch (R3) is closed with C5) closed, the output of the AND circuit (ANo') becomes "High" and an interwoven signal is input to the interwoven terminal (i,).

At this time, the calculation of the exposure control data has already been completed, and the process moves to the flow of the exposure control operation from step +39 onwards. The flow from this step +39 onwards is that once the exposure control data is calculated in the microcomputer [1], the microcomputer (1) or +1.2.4
．． No matter which step of the operation is being performed except for flow No. 5, it will be executed immediately when the interwoven signal is input to the interwoven terminal (i,). In addition, this step temple 3
The transition to step 9 is carried out by immediately jumping from the routine being executed and executing the instruction at a specific address as soon as the microcomputer (1) receives the interwoven signal.

The microcomputer [1] first performs step ≠ 39.
Then, set the output terminal (02) to II L Ow 1゛, turn off the power supply transistor (B'r2), cut off the power supply from the camera body to the lens, and stop the creation 1 of the data output section (7) of the lens. let Next, step +-4
At 0, blank display data is output to erase the display on the display section (DP), and at step +-41, the output terminal (0,
) to "l" (i gh), and the release circuit (RL
) is operated and the output of the inverter (IN2) is set to II L 0w t+ to maintain conduction of the power supply 1-'''y transistor (BTl).

When the release circuit (RL) operates, the exposure control mechanism (not shown) starts operating. Sunzu, narrow down IJ Inter 1
The narrowing down operation according to 3) starts and the /C/res generator (PG) outputs a number of pulses corresponding to the tachometer of the narrowing down link (13). When the count value of the pulses output from this pulse generator (PG) matches the aperture stage number control data Av-Avo' output from the output capo-1-(OF2) of the microcomputer (1), the aperture control device (CA) to the aperture ring (1
A signal for stopping the diaphragm diaphragm according to 3) is output, and the diaphragm aperture is determined. At this time, the reflection mirror (not shown) of the camera is raised at the same time. When the aperture aperture is determined and the reflection mirror is completely raised, for example, the front curtain (not shown) of the focal plane shutter starts running and the exposure time control device (CT) starts counting the exposure time. This exposure time control device (CT
The clock pulses (CP) are counted at ) and the value of clock pulses (CP) is compared with the exposure time data T■ from the output port (OPl) of the microcomputer (1).

When the selected mode is flash photography mode, when the shutter is fully opened, the flash emission control device (FC)
A light emission start signal is output from the flash light emitting device (FL) through the terminals (JB6) and (JF2).
) and the xenon tube starts emitting light. A table in which the photometric integral value by the above-mentioned film surface photometry circuit in the flash emission control device (FC) reaches a predetermined value,
The light emission stop signal is sent from the terminals (JB) and (JF3)
The light is input to the flash light emitting device (FL) via the flash light emitting device (FL), and the light emission of the xenon tube is stopped. Whether in flash photography mode or natural light photography mode, the exposure time control device (CT)
When the exposure time count value matches the exposure time data Tv from the microcomputer (1), the exposure time control device (CT) starts running the shutter trailing curtain (not shown). When the trailing curtain completes running, the accidental exposure prevention switch (O8) is opened, the reflecting mirror is lowered, and the aperture opening [] becomes the open aperture, thereby ending the exposure control operation.

The microcomputer (1) waits for the accidental exposure prevention switch (C5) to be opened and the input terminal (12) to become ``LOW++'' when the exposure control operation is completed in step +42, and then the input terminal (12) becomes ``LOW''. ”, step +4
3, set the output terminal (01) to ''I, 0W11 to release the power supply hold by the transistor (BT, ). Also,
When the accidental exposure prevention switch (C/S) is opened, the output of the AND circuit (ANo) is inverted to LL L 0W11, so it is impossible to receive the interwoven signal to the interwoven terminal (i-) at step ≠ 44. After that, 5 tar
Return to t.

At this time, as mentioned in @, if the photometric switch (MS) continues to be closed, data reading, calculation, and display operations are performed again, and even if the photometric switch (MS) is not closed, the data is The operations of reading, calculating, and displaying can be repeated for a certain period of time. In addition, after the photometry switch is closed and data reading, calculation, and display operations are performed while the accidental exposure prevention switch (C8) is open, that is, the film winding is not completed. Even if the release switch (R3) is closed and the output of the inverter (■N3) becomes "I (i g h"), the accidental exposure prevention switch (O8) is opened and the inverter (IN4)
Since the output of is "Low", the output of the AND circuit (ANo) remains ``Low'', and the included terminal (i,) of the microcomputer (1)
In this case, the interwoven signals are not manually processed, and therefore the microcomputer (1) is exposed! All IIJ control operations do not work.

Note that data reading and calculations are performed immediately after the exposure control operation is completed and before the film is advanced, that is, when the accidental exposure prevention switch (C8) is opened and the photometry switch (MS) is opened. , the display operation may be stopped.

In this case, input terminal (11) crab at step +1.
If it is determined that the input terminal is not “High”, the input terminal (1
Step 2) is to determine whether or not ``g + 1''.

It is provided before +2, and when it is determined that the input terminal (1□) is “)iiih”, the process moves to step≠2, and it is determined that the input terminal (1□) is “Low”. It is only necessary to set +1 data in the timer register (TR) and move to step +2.

At this time, the contents of the timer register (TR) are larger than K, so step +4 and step.

≠5 and the photometry switch (MS) is released, the data reading, calculation, and display operations are immediately stopped.

To briefly explain the interconnected operations of the microcomputer (1) detailed above, the photometric switch (MS)
) is closed and data reading, calculation, and display operations are completed once and all data for exposure control is prepared.
The microcomputer (1) U is not in a state where it is possible to receive the interwoven signal, and at a later point in time, it starts an exposure control operation by the interconnected signal as soon as the release switch (R3) is closed. Furthermore, even when the photometry switch (MS) is opened and the operations of reading, calculating, and displaying data are repeated for a certain period of time, it is possible to receive an interlab 1 signal. Then, after a certain period of time has elapsed since the photometric switch (MS) was opened, it becomes impossible to receive interwoven signals.

By configuring as described above, when the microcomputer (1) has not calculated the data necessary for exposure control, the microcomputer (1) will not receive the high-inclination signal even if the release switch (R8) is closed. However, since the exposure control operation is not started, there is no possibility of improper exposure. If the release switch (R3') is closed while the microcomputer (1) is outputting the data necessary for exposure control, the microcomputer (1) will immediately switch from the current operation to the exposure control operation. , so you never miss a photo opportunity. Furthermore, even if the release switch (R3) is closed before the film winding is completed, the microphone 7' also has a function based on the interactive signal of the microcomputer (1) so that the interactive signal is not manually input to the computer (1). Since this is connected to the camera's exposure control start operation, there is no possibility of the camera starting the exposure control operation erroneously before the exposure control mechanism is ready. Furthermore, while the photometry switch (MS) is closed, the operations of reading data from the lens and reading, calculating, and displaying data for exposure control are performed repeatedly. Even if variable data such as the shooting distance of the lens is changed, calculations are immediately performed based on this changed data, and even if you frequently move the setting ring such as the distance ring for setting the shooting distance of the lens, the calculation will be performed immediately. This will result in inappropriate exposure. There is no problem.

Next, the detailed configuration of the setting aperture signal output device (AS) of the above-mentioned exposure control data output section (5) will be explained. ) and the focal length information output device (FS) are similar in configuration to this setting aperture signal output device (AS).

The setting aperture signal output device (AS) outputs the aperture stage number data Ass-Ago' according to the setting position of the aperture setting ring (11) (Fig. 1) of the lens, as shown in Fig. 3. (11) Sliding member (VT
) is locked in one of the positions ① to ② corresponding to the set position of the diaphragm setting ring (11) by mechanical licking of the diaphragm setting ring (11). The conductive pattern (COM) is grounded and the other conductive pattern (PA)
o) to (PA4) are connected to the power supply line (+
VB). therefore.

When the contact piece of the sliding part (VT) comes into contact with any of the conductive patterns (PAo) to (PA, , ), the conductive pattern (CQM) and the conductive pattern (PAo"l to (PA, )
, ) that are in contact with the sliding member (VT) are short-circuited by the sliding member (VT), and the conductive pattern (P
Inverters (Ao) to (PA, , ) connected to
1N2o) to (IN24), the sliding part IJ (VT
The output of the inverter connected to the conductive pattern that is in contact with "l" becomes 'High'. Also, among the inverters (N2o) to (IN24) connected to the conduction/C turns (PAo) to (PA4), the output of the inverter connected to the conduction pattern with which the sliding member (vT) is not in contact is It becomes “Low”.

The output terminal (d4) of the inverter (IN) is the negative input terminal of the exclusive OR circuit (EO3) and the data selector (M
P, ) (Fig. 1) is connected to the human power port (P3) of the inverter (IN25), and the output terminal of the inverter (IN25) is connected to the exclusive OR circuit (
EO3). The output terminal (d3) of the exclusive OR circuit (EO3) is the output terminal (d3) of the exclusive OR circuit (EO2).
) and the input port (IP3'l) of the data selector (MPl), and the inverter (IN2
The output terminal of ゜) is connected to the other input terminal of the exclusive OR circuit (EO□), and the output terminal of the exclusive OR circuit (EO2) (
d2) is connected to one input terminal of the exclusive OR circuit (EOl) and the input capo-1-(IF5) of the data selector (MP).

The output terminal of the inverter (IN2,) is connected to the exclusive OR circuit (E
is connected to the other input terminal of the exclusive OR circuit (E
The output terminal (dl) of OL) is an exclusive OR circuit (EO,,)
and the input port (IF5) of the data selector (MPl). In addition, the inverter (
The output terminal of IN2o) is connected to the other input terminal of the exclusive OR circuit (EOo'), and the output terminal (do'1) of the exclusive OR circuit (EOo) is connected to the input port (It'3) of the data selector (MPl). Connected. Also, the continuity pattern (
The shapes of PA4) to (PAo) are sliding members (VT)
is set to one of the setting positions ■ to ■ and the terminal (d4
) to (do') are determined to be gray codes. Setting position of sliding member (VT)■
Inverters (IN24) to (IN2o) in
) and the outputs of terminals (d4) to (do) are shown in Table 2.

Table 2 Below, the set aperture value and the setting position of the sliding member (VT)
I will explain the relationship with [stocks]. Table 3 shows the relationship between the set position of the sliding member (VT) and the set number of aperture stages. For example, in the case of a lens with an aperture value of Fl, 2 to F22, F 1.2 (AV = 0.5) When set to , the sliding member (VT) is at the setting position ■ and the terminal (d4
) to (do), the data "' indicates that the number of narrowing steps is 0.
ooooo” is output, F 1.4 (AVI = 1
), the sliding member 1'VT) is at the setting position (2), and data "00001" indicating the number of narrowing steps is 0.degree. 5 is output from the terminals (d4) to (do). When F22 (AC9) is set, data ``1000 bits'' indicating the number of narrowing steps of 85 is output. In this way, the open aperture value is Fl, 2, Fl, 4, F2
, F2.4, F2.8, F8.4. F4, F4.7, etc. Av=0.5.1, ■, 5.2.2.5.3.
3.5.4.4.5, it is possible to output data for the number of refinement stages in 'Ay units using the above-mentioned 5-bit data.

Table 3 By the way, some interchangeable lenses have an aperture value of F2°5.
(Ay = 2.64), F 3.5 (Av = 8
．． 61), Fl, 8 (AM-1,7), F 4.5
(Av=4.34), F6゜3 (AV=5
．． There are some interchangeable lenses such as 31') that are not in units of 0.5 EVl. When such an interchangeable lens is attached, Q
, the number of stop-down steps is output in units of 5Ev, and the number of stops output at each setting position is Q, in units of 5Ev, but the setting obtained from this data on the number of stop-down steps and the data of the open aperture value. Aperture value data is 0.5E
It is not in units of V, and the index on the aperture setting ring does not match the actual aperture setting. Therefore, the obtained set aperture value and the actual set aperture value may differ, resulting in an exposure error. Furthermore, the open aperture data is 0.5E
Since the information is not expressed in units of v, when attempting to obtain accurate set aperture value information, a problem arises in that the number of bits of the open aperture value data increases.

In addition, when a lens whose maximum aperture value is not set in o5Ev units as described above is attached, the click position when set to the maximum aperture value will be adjusted according to the amount of deviation from the 0.5Ev unit of the maximum aperture value. It is also possible to change the code from the position ■, but in this case, in order to read the amount of change from the open position to the position ■, it is necessary to increase the number of bits in the conduction pattern, and the code pattern may be complicated. Furthermore, a problem arises in that the area of the board for the code pattern becomes large.

Therefore, even if the aperture value is not set in units of Q and 5Ev as mentioned above, the sliding member (vT) should be at the set position ■ when the aperture ring is set to the maximum aperture. Then, at the next click position, that is, the setting position ■, it is 0.
．． Set the aperture value in 5EV increments. To take a specific example, the open aperture value is F2.5 (Av=2.6
4), the set aperture value is F2.
8 (Av-3). Therefore, the number of stops at setting position ■1 is 0.36L.
Even though there is no aperture value, the data ``00001'' is output, which corresponds to stopping down the lens by 0.5 stops.Then, the maximum aperture value of the interchangeable lens is input as 5-bit data in units of 0.5Ey. In the case of this interchangeable lens, 0.5 Eν small unit F 2.4 (AV = 2.5
) is input, and the actually set aperture value is obtained from the data of the number of stops and the open aperture value.

Therefore, it is possible to accurately read the data of the set aperture value at positions other than ■. However, the sliding member (VT) at the click position for any lens,
Since it is located at the center position of the code pattern corresponding to each code value, reading errors due to the stiffness of the sliding member (Vi') will not occur.

Next, open the aperture value by 0° and 5 stops from the aperture value at setting position ■ of the interchangeable lens (in the above case, F2.4 (AV;
-2, 5)) data and the difference (0, 14) between this maximum aperture value and the actual maximum aperture value are input from the interchangeable lens, and the data of the actual maximum aperture value is Try to get these two pieces of data. therefore,
There is no increase in the number of bits of each data.

A general explanation of the above is as follows. The set aperture value is Ays, the actual open aperture value is AvO1, and the aperture value on the 0.5 step open side from the setting position is A+vo', A
Let the difference between v o and AM o' be ΔAVI o . First, the data on the number of narrowing steps from terminals (d4) to (do) obtained by the code pattern is Ay: s −
Corresponds to Avo', and from an interchangeable lens, A v o' and Δ
AVO data will be sent. The two pieces of data from the interchangeable lens are fixedly stored in a data output section (7) (FIG. 1) within the interchangeable lens, as will be described later. Based on the three data of Konot et al., (Avs - Avo') + Av, o' = AV
S ・-19) Avo'+ΔAv1o = Av,.

By performing the calculation, the set aperture value Avs and the actual open aperture value Avo can be obtained.

Note that this is an interchangeable lens that is configured such that once the 1st aperture setting pin (15a) has reached the position set by the aperture setting ring (11), the 1st aperture setting pin (15a) will not rotate any further. That is, in the case of an interchangeable lens in which the tachometer of the aperture setting ring (11) and the rotation amount of the aperture cutting pin (15a) are equal, the following measures are required.

The amount of movement from setting position ■ to setting position ■ is 0.5 Ev
However, the actual number of aperture stages needs to be different depending on the interchangeable lens. In other words, the open aperture value is F2
．． For F5, it needs to be 0.36 steps, for F3.5, it needs to be 0.39 steps, for Fl, 8, it needs to be 0.3 steps, and so on. Therefore, depending on the mechanical structure of the interchangeable lens, the aperture pin (l 5a) can be adjusted from the setting position ■ to the setting position ■.
While the lens is moving, the actual aperture will be adjusted by 0.36 stops for an F2.5 lens, and the aperture lever will change between setting position ■ and setting position ■, setting position ■ and ■, and so on. (
15) The actual aperture is narrowed down by 05 steps, which is equal to the amount of movement in step 15).

The relationship between the amount of movement of the aperture pin (l 5a ) mentioned above and the actual aperture value of the aperture is explained using the graph in Fig. 4. In Fig. 4, the vertical axis represents the actual aperture value of the aperture, and the horizontal axis represents the aperture value of the actual aperture. The amount of movement of the drawing pin (15a) is shown. If the lens has an open aperture value of F2 (Av-2), as indicated by the dashed-dotted line, the actual aperture will be gradually narrowed down from F2 as the aperture lever (15) moves. Therefore, if the planned aperture value is Av, then ΔAvo=Q, so compare the data of AVI - AvO' (=ASAo) and the data of the movement amount of the aperture pin (15a), and when they match, When the movement of the aperture pin (15a) is stopped, the actual aperture changes to the planned aperture value AvI.
will be controlled by.

On the other hand, the maximum aperture value shown by the solid line is F2.5 (Av
-264) or the open aperture υ value shown by the two-dot chain line is F
In the case of a lens with a diameter of 1.8 (Av-1,7), while the aperture focusing pin (15a) moves by an amount corresponding to ΔAvo, the actual aperture value remains up to the maximum aperture value of 1. As shown, the aperture mechanism section of the lens is constituted by a known cam mechanism. Then, when the narrowing pin (15a) moves beyond the elbow corresponding to ΔAvo.

The actual aperture value is narrowed down from Avo' by the amount corresponding to the amount of movement of the aperture pin (15a).

Therefore, even with such a lens, the AV
-ANO' data and data on the movement amount of the aperture pin (15a'l) are compared, and if they match, the aperture control becomes possible by stopping the movement of the aperture lever.

Next, the interface circuit (I
F) and the detailed circuit configuration of the data output section (7) on the lens side will be explained based on FIGS. 5 and 6.

As shown in FIG. 5, the interface circuit (IF') connects the output terminal (02) of the microcomputer (1) to which the data reading start signal is output, and the one-shot circuit (
The input terminal of O81) is connected, and the output terminal of this Funshot circuit (O8,'I) or the flip-flop (FF1)
is connected to the set input terminal of When the data reading start signal is output to the output terminal (0□) of the microcomputer (1), the one-shot circuit (O81)
A pulse of ghll is output, and at the falling edge of this pulse, the flip-flop (FF1) is set and the Q output section is output.
This flip-flop (FF
The Q output terminal of 1) is connected to one input terminal of an AND circuit (ANl) and the D input terminal of a D flip-flop (DFl), and the other input terminal of the AND circuit (ANl) is connected to the oscillator (O20) ( The output terminal (CP) of FIG. 1) is connected, and the output terminal (CPL) of the AND circuit (ANl) is connected to the clock terminal of the D flip-flop (DFl). The output terminal (CPIj) of the AND circuit CAN1) is further connected to the terminal (JB2), and the terminal (JB2) to the lens side.
A clock pulse (CPL) is supplied through the clock pulse (CPL).

A D flip-flop (DFl) is a flip-flop (
FF1) is set and the next clock pulse (CPL)
At the falling edge, take in the D input and make the Q output 'High'
Make it. The Q output terminal of this D flip-flop (DFl) is connected to the reset terminal of the counter (COl), (CO2), (CO3) and the enable terminal of the decoder (DE2), (DE), respectively.
) becomes ``)Jigh'', the counter (
col), (CO2), and (CO3) are released from the reset state, the decoder peaks E2) and (DE3) become available for output, and data reception between this interface circuit (IF) and the lens side is completed. becomes ready for transfer.

- output terminals of the OR circuit (OR1) are flip-flops (FF, ), (FF3) and D flip-flops (D
Fl) is connected to the glue set input terminal and receives the pulse (FF2) from the power-on reset circuit (PO2) (Fig. 1).
Or, it indicates the completion of reading data from the AND circuit (AN, □) to the interface circuit (IF), which will be described later, and the flip-flop (FF1') and the D flip-flop (DF
1) is reset, and the flip-flop (FF3) is set by the rising edge of the pulse (FF2) or the pulse (end2).

On the other hand, in the data output section (7) of FIG. 6, when the terminal (02) of the microcomputer (1) of FIG. 1 becomes "High" as described in 01■, the transistor (
BI3) becomes conductive, and power supply starts from the camera body side to the lens side via the terminals (JB, ) and (JL,). As a result, the power-on reset circuit (POi) operates, and the flip-flop (FF7) whose reset terminal is connected to the output terminal of the power-on reset circuit (POi) operates.
), the D flip-flop (DE5) is reset to 1 at the rising edge of this pulse, and furthermore, the flip-flop (FF5) to which the set terminal is connected is set at the falling edge of this pulse. Then, from the AND circuit (ANl) of the interface circuit (IF') in FIG.
At the falling edge of the clock pulse (CPL) input via JB2) and (JB2), the flip-flop (FF5
) is taken to the D flip-flop ωF5), and the Q output of the D flip-flop (DE5) becomes “High.”
Become ゝ゛. The Q output terminal of this D flip-flop (DE5) is connected to the reset terminal of the counter (CO4), (CO5) and the enable terminal of the decoder (DE4).
Q output of D flip-flop (DE5) “High”
As a result, the counter (Co), (CO5)4 is released from the set state and the decoder (DE4) is cleared.
) enters the output EJ function state. Here, the "High" pulse width of the one-shot circuit (O81) (Fig. 5) is set to the "H" pulse width from the power-on reset circuit (PO3).
If the pulse width of "high" is made p longer, the flip-flop (FF5) in FIG. 6 is set, then the flip-flop (FF1) in FIG. Therefore, the first clock pulse (
CPLW) At the falling edge, the D flip-flop (D
Fl) and the Q of the D flip-flop (DF5) in FIG.
The output becomes 'High', and the reset state of the circuit on the camera body side and the circuit on the lens side is released at the same time.

The counter (C) of the interface circuit (IF) in Figure 5
The counter (CO) and decoder (DE4) of the data output section (7) in Figure 6 are circuits that output timing signals for synchronizing the camera body side and the lens side, respectively. The counter (CO), clock pulse (CP), and counter (Co4) are each 4-bit hexadecimal counters that count clock pulses (CPL). The decoder (DE2) is a counter (CO
l) Bottom 3 humans (CB2), (cBl).

(CBo) is input, and the output terminals (TL7) to (TBo) of the decoder (DE2) are input according to this 3-bit data.
) becomes "High". In addition, a decoder (IJ
E4) is the lower 3 pins of the counter (CO4) - (Cl3
), (CLl), and (CLo) are input, and the output terminal (T
One of L7) to (TLo) becomes 'High'.The output states of these decoders (DE2) and (DE4) are shown as TBo(TLo) to TB7(TL7) in the time charts of Figures 7 and 8. and the counter (COl), (C
O4) output and decoder (DE2).

Table 4 shows the relationship with the output of (DE4). In addition, hereafter.

The timing at which the terminals (TBo"l, (TLo) become 'High' is expressed as (TBl), (TLo)'s timing, and the timing at which the terminals (TBl), (TLl) become 'High' is expressed as (TBl), ( This is called the timing of TL 1).

Table 4 The counter (CO) in Figure 5 is a 3-bit counter that counts the pulses at the output terminal (CP3) of the counter (COl), and the output (C82) of this counter (Co),
(C3L (C8) and counter (CO) output (CP3
) and 1 0
1 is manually input to the decoder (DE3), and in response to this input, the output terminals (So) to (S1) of the decoder (DE3)
One of 4) becomes "High 11". The output of this decoder (DE3) is this interface circuit (IF
) serves as a signal for the step of outputting the address data pole and the step of reading data from the lens. After that.

The output terminal (So) of this decoder (DE3) is “Hi”
gh” step (So), terminal (
The step in which Sl) becomes ")ligh" is called step (Sl).

The state of each step is shown in (DE3) in the time charts of FIGS. 7 and 8, and Table 5 shows the relationship between the input and output of the decoder (DE3).

In the interface circuit (IF') of FIG. 5, one input terminal of the AND circuit (AN7) is connected to a decoder (DE).
2) terminal (TB6) is connected and the AND circuit (AN7) is connected.
) to the other input terminal of the counter (COl).
CL3) is connected via the inverter (I No/), and the output terminal of this AND circuit (AN) is connected to the counter (C
O3) clock input terminal. The counter (CO) is 7 in the ROM (ROl) on the lens side (Figure 6).
A 3-bit counter used to specify the address.The output of this counter (CO3) is sent to the shift register (
SR1) input terminals (Ba3), (Ba□), (Ba1
). This counter (CO3) is the counter (
This is a counter that counts the pulses output from the output terminal (TB6) of the decoder (DE) when the output terminal (CL3) of the decoder (DE) is 0W11, and the output of this counter (CO) is '010' at the timing of (TB6) in (S), '011' at the timing of (TB6) in step (S), and '011' at the timing of (TB6) in step (S6).
) at the timing of “100-step (S8) (TB
6) At the timing of "101", step (S) (
It becomes "110" at timing 0 of TB6).

In the shift register (SR1) in Fig. 5, among the 8-bit input terminals, the input terminal (Ba7) is the terminal other than the terminal (Ba), (Ba), and (Ba1) to which the output of the counter (CO3) is connected. 〜(B a 4 ), (B a
o) is grounded and "o" is always operated manually. When the input of this shift register (SR1) [, switching terminal (SP) is II l (i gllll), the clock terminal (
At the rising edge of the clock pulse (Cp) of the clock pulse (CL), the data of the input terminals (Ba□) to (Ba o ) are taken in parallel, and when the input of the switching terminal (SP) is "ILOWll", the data of the clock terminal (CL') is taken in parallel. The data captured at the rising edge of the clock pulse is serially output from the upper pit to the output terminal (OUT).This shift register (SR1
) flip float two (FF2) to the switching terminal (SP)
The Q output terminal of is connected, and the flip-flop (FF2)
The output terminal of the AND circuit (AN2) is connected to the set input terminal of the AND circuit (AN2), the terminal (TB6) of the decoder (DE) is connected to one input terminal of the AND circuit (AN2), and the other input terminal of the AND circuit (AN2) is connected to the output terminal of the AND circuit (AN2). Connect the input terminal to the clock terminal (C
P) is connected. In addition, flip-flop (FF2
) is connected to the output terminal of the AND circuit (AIN3), and one input terminal of the AND circuit (AN3) is connected to the reset input terminal of the decoder (DE2). - (TB7) is connected, and the clock terminal (CP) is connected to the other input terminal of the AND circuit (AN3). This flip-flop (FF2) is set at the falling edge of the clock pulse (CP) output at the timing of (TB6),
It is reset at the falling edge of the clock pulse (CP) output at the timing of 1" B 7) (see Figures 7 and 8).
FF2 in the figure). Therefore, shift register (SR1)
inputs data in parallel at the rising edge of the output terminal (TB) of the decoder (DE2), and
Data is output in series at the timing of 6).

The output terminal (e n d 1) of the AND circuit (AN15) is connected to the set input terminal of the flip-flop (FF3) in FIG.
) are connected. The terminal (TB6) of the decoder (DE) is connected to one input terminal of this AND circuit (AN15), and the terminal (S1) of the decoder (DE3) is connected to the other input terminal.
□) is connected. Therefore, the pulse (end,) is output at the timing (=l'B6') of step (S). As will be described later, this 12 timing is the timing at which reading of all fixed data of the lens is completed, and there is no need to output address data from this interface circuit (IF) to the lens side, so this pulse ( en
dl) sets the flip float (FF3) to make the Q output l Low 11, and sets the output of the AND circuit (AN4) to which this Q output is connected to one input terminal to II Low 1. Switch circuit (SC1)
becomes non-conductive. The terminal (CB) of the counter (COX) is connected to the other input terminal of this AND circuit (AN4), and the flip-flop CFF3 is reset by the empty pulse of the OR circuit (OR1) and receives the pulse from the AND circuit (AN). (endl), the switch circuit (SC,) conducts and the shift register (SR
1) The address data from terminal (JB3), (JB3
) is sent to the lens side circuit.

The output terminal (CB3) of the counter (CO) is also an inverter.
The Q output terminal of the flip-flop (FF3) is connected to the other input terminal of this OR circuit (OR3), and the OR circuit ( The output of OR3) is connected to the switch circuit (SC
2) and one input terminal of the AND circuit (AN5). Then, the output terminal (TB5) of the decoder (OR2) is connected to the other input terminal of the AND circuit (AN, , ).
) is connected, and the output terminal of the AND circuit (AN5) is connected to the latch terminal (L) of the latch circuit (LA). The switch circuit (SC) has a terminal (JB3) and a shift register (
The shift register (SR2) is connected to the input terminal (IN) of the SR2), and the shift register (SR2) is supplied to the input terminal (IN) in synchronization with the falling edge of the clock pulse (CP) generated manually by the clock terminal (CL). Data terminals (Bb4) to (Bb
o). While the flip-flop (FF3) is in the reset state (that is, from the start of reading data from the lens until the reading of fixed data is completed), the output of the OR circuit (OR) is output from the counter (CO1). While the output terminal (CB3) of 'l is "Low", it becomes II Hi gllll, and during this time, the switch circuit (S02) is conductive and data is taken into the shift register (SR2).On the other hand, the counter ( C
When the terminal (CB3) of the terminal (CB3) of SC2) is alternately conductive and never conductive at the same time. Therefore, while the switch circuit (S01) is conductive, address data is output to the signal line (SB), and this address data is output to the terminal. (JB), (JB3) are sent to the lens side circuit, and while the switch circuit (SC2) is conducting, data from the lens is sent to the terminals (JB3), (JB3) and the signal line (SB). The output terminals (Bb4) to (Bbo) of the shift register (SR2) are sent from the lens side to the shift register (SR2) on the camera body side.
is connected to the input terminal of the latch circuit (LA), and the output of the OR circuit (OR3) of the latch circuit (LA) is connected to the input terminal of the latch circuit (LA).
The output of the shift register (SR2) is latched at the rising edge of the timing (TB5) at "h".

The outputs of the latch circuit (LA) are connected to the input terminals of the registers (REGo) to (REG7), respectively, and the latch terminals (Ij) of these registers (REGo) to (REG7)
The outputs of the AND circuits (ANlo) to (AN17) are respectively connected to the terminals. AND circuit (AN') to (AN,
The output terminal (TB6) of the decoder (OR2) is connected to the -0 input terminal of
) are connected respectively, and the AND circuits (AN) to (AN
17) Connect the output terminal (S) of the decoder (OR3) to the other input terminal of O.
2”l.

(S4), (S6), (S8), (S1o], (S1□
), (S13) and (S14) are connected, respectively. The output of the AND circuit (AN15) is 1 at the terminal (endl) that becomes "High" when reading of the fixed data of the lens is completed as described above, and this terminal (endl) is the set input terminal of the flip-flop (FF3). connected to. Furthermore, the output of the AND circuit (AN17) is ``)(i
This is the terminal (end2) that becomes “g Il”, and this terminal (
e n d 2 ) is connected to the set input terminal of the flip-flop (FF4), and this flip-flop (FF
The Q output terminal of 4) is connected to the microcomputer (1) shown in Figure 1.
) is connected to the input terminal (i3) of

The output terminal of the OR circuit (OR2) is connected to the reset terminal of the flip-flop (FF4).
2) has a power-on reset circuit (PO
2) The output terminal (FF2) of (Fig. 1) is connected.

An output terminal (C7) of a decoder (DE1), which will be described later, is connected to the other input terminal of the OR circuit (OR2). Therefore, this flip-flop (FF4) is reset by the pulse output from the output terminal (FF2) of the power-on reset circuit (PO) when the photometry switch (MS) (Fig. 1) is closed, and all of the lenses When the reading of the data is completed, the output terminal (end) of the AND circuit (AN17)
It is set by the pulse output from 2). 1, the terminal (a□) of the decoder (DEL) is 11 High ghl at the end of data reading from the interface circuit (IF) to the microcomputer (1), as described later.
1, and the flip-flop (FF4) is reset at the end of data transfer to the interface circuit (1F) and the empty microcomputer (1).

The output port (OR3) of the microcomputer (1) is connected to the input terminal of the decoder (DE1'), and the decoder (DE1')
One of the output terminals (a o ) to (C7) of
i g h”.

Table 6 shows the relationship between the human power and output of this decoder (DEl).

Table 6 Decoder (DEl) output terminals (ao') to (C7
) are connected to the chip select terminal (C8) of each of the registers (REG) to (REG7), and the data read from the register whose chip select terminal (C8) is "High" is sent to the data selector (MPl) ( Person (Figure 1): H Ho l- (IPl), and this data is output to the data selector (MP, ) and the data bus (D
B) is read into the microcomputer (1).

In the data output section (7) in FIG.
The output terminal (OR3) of the counter (ao4) is connected to one input terminal of the AND circuit (AN3o), and the Q output terminal (昂ゝ) of the flip-flop (FF7) is connected to the other input terminal of the AND circuit (AN3o). The switch circuit (S0
3) is connected to the control terminal. The shift register mentioned above (
SR3) clock input terminal (CIj terminal (JL2)
The clock pulse (CPL) from the camera body side is input to this shift register (SR3), and while the switch circuit (SC3) is currently conducting, the terminal (JB3), (
The address data input in series via the terminals JL3) are sequentially transferred in parallel to the Nishiki 1 children (La6) to (Lao) in synchronization with the falling edge of the tarok pulse (CPL).

The AND circuit (AN3□) outputs the lower 3 bits of the shift register (SR3) (La), (La, ), (
Lao) is input, and the output (La□) of this shift register (SR3).

When (La) and (La o') become "110", the output of the AND circuit (AN3□) becomes "High".
".At this time, the final address data for fixed data has been sent from the camera body.The output of this AND circuit (AN3□) is the output of the AND circuit (AN3.)
is connected to one input terminal of the AND circuit (AN35)
The clock pulse (CPL"l) is input to the other input terminal of the AND circuit (AN35), and the output terminal of the AND circuit (AN35) is connected to the set input terminal of the flip-flop (FF7). Therefore, the flip-flop (FF7) is connected to the timing (T
At L7), the output of the AND circuit (AN3,) is “High”
h", that is, when it is determined that the final address data for lens fixed data has been taken into the register (SR3'), the Q output (FD) becomes "l(
i g h” and the Q output (FD) becomes l Low 1
It becomes 1. Q output (FD) of flip-flop (FF)
) is connected to the - input terminal of the AND circuit (simple, 2), and the output terminal (TL6) of the decoder (DE4) is connected to the other input terminal of the AND circuit (AN3□). The output terminal of AN3□) is the counter (Co, ,
) is connected to the tally input terminal (CIj) of the counter (CO5). Therefore, the output (Ca) of the counter (CO5), (Ca)
When the QO output (FD) of 71Jtsu 7'7CI tube (FF7) becomes "High", the next step (S
1□) at the timing (TL6) “01゛, at the next step (S13) timing (1゛L6)” 10
” becomes.

The outputs (Ca□) and (Ca o ) of the counter fco are connected to the selection terminal (SL) of the data selector (MP2) and the data input sections (α) and (α3), respectively. The data input section (α1) of the data selector (MP) is connected to the 7-bit output terminals (La') to (
La 6) is connected to 0, and the data input section (
The most significant bit of α2) is grounded, 2 pins from the most significant
The -th and 3rd bits are the output (Ca) of the counter (CO5).
), (Cao'I are connected, and the output terminal of the shooting distance information output device (DS"l) is connected to the lower 4 bits.

The most significant bit of the data input section (α3) of the data selector (MP) is grounded, and the second and third bits from the most significant are connected to the output terminals (Ca 1), (C
ao) is connected, and the output terminal of a focal length information output device (FS) is connected to the lower four bits. This data selector (MP2) outputs the data from the data input section (α1) if the input data to the selection terminal (Slj is "o o", and outputs the data from the data input section (α2) if it is "o i". If it is "10", the data from the data input section (α3) is output. Therefore, the data selector (MP2) outputs the data from the step (S1□
) until the timing of ("I'L6)", the data of the data input section (α1), that is, the address data taken into the shift register (SR3) from the camera body, is output.
From the timing (TL6) of step (S1□) to the timing (TL6) of step (S13), the data of the data input section (α2), that is, the shooting distance information output device (
The address data output from the DS) is output, and after the timing (TL6) of step (S13), the data of the data input terminal (α3), that is, the address data output from the focal length information output device (FS) is output. be done.

The output terminal of the data selector (MP2) is the ROM (ROl).
) lower 7 bits (F6) to (ro) of the address terminal
The most significant bit (F7) of the address terminal of the ROM (ROl) is grounded.

Next, the relationship between the lens data fixedly stored in this ROM (RO,) and addresses will be explained. Table 7 shows the relationship between the allocation of ROM (RO) addresses and the contents of lens data, and Table 8 shows the meaning of each data. In addition, as an example of a specific lens, the focal length is 50 mm to 135 mm and the aperture value is F3, 5 to F2.
2 is a diagram showing a zoom lens that is variable by 2.

As shown in Table 7, the address "00000001" stores data "11100" for detecting attachment of the lens to the camera body. In this case, the data "11100" is stored at the above address for any type of lens, not just the lenses mentioned in the specific examples. The data for this check is “1”
Any data other than 1100'' may be used as long as the data is common to all types of lenses.

The data of the open aperture value AVO' is stored in the address "00000010", and in this example, the open aperture value is F3.5 (aperture value AM=3.61), so the F3. 4 (Data "00111" corresponding to Ay-3,5'I is stored."00000
Since the data of the maximum aperture value Avm is stored in the address 011'', which is F22 (Au=9) in this example, the data ``10010°'' of F22 (Av=9) shown in Table 8 is It will be remembered. ”0000010
0" 17) For 7 dresses, the above-mentioned open aperture error □yO
data is stored, and in this example the exact error is 0.
．． Since it is 11 Ev, this is approximated to 1/8 unit and the temperature v is shown in Table 8.

Data "00001" corresponding to -1/8 is stored. Note that Table 9 shows data on AV'O and AAvo of lenses whose open aperture values are not set in units of 0.5 Ev.

Furthermore, in the case of a lens whose open aperture value is in units of 0.5 Ev, AV'O is the data of the open aperture value, and ΔAVO is zero data 'oooooo'.

Table 9-21 The difference address "00000101" stores data "'01011" corresponding to 50Tn'I/L shown in Table 8 at the shortest point of the zoom lens. In the case of a distance lens, the focal length data of that lens is stored.Address'(XI
X) l) Data ft of the longest focal length of the zoom lens is stored in 110°, and in this example, data ft corresponding to 1357n1n shown in Table 8 is stored as 10001°.
° is memorized.

In the case of a fixed focal length lens, the data "111] 1" is stored without indicating that it is a fixed focal length lens.The above data is the fixed data of the lens.

Address '00010000' to '000 month 1°
Shooting distance data as variable data is stored in the range ゛, and shooting distance information outputs 4-bit data corresponding to the amount of movement from the closest position of the distance ring (not shown) to the set distance position. The lower 4 bits of the address are specified by data from the output device (1)S, and data representing the absolute value of the photographing distance stored in this address is output. In this example, the shooting distance information output device (DS)
When the data '0010°° is output, the address '00010010' is specified, and the data '0110' representing 2 m (Dy=2) written in this address is
” is output, and when the data “1011” is output from the shooting distance information output device (US,), the address “000” is output.
11011" is specified, and 9.5 m (DV = 6.
5) and data "10101" is output.

Note that the shooting distance data is used in calculations for flash photography, so it is in the same series as the aperture value, so that data corresponding to the value of JP- is output when ■ changes by 0.5 units. However, the shooting distance information output device (1)
While increasing the number of bits of address data from S), R
By increasing the number of bits of data in OM, (RO,),
It is also possible to increase the range of data in smaller units.

Address data “'00100000”° to “’00”
101111'' stores data on the set focal length in the case of a zoom lens, and in the case of a fixed focal length lens, it is remembered that it is a fixed focal length lens. The lower 4 bits of the address are data from a focal length information output device (FS) that outputs 4-bit data corresponding to the amount of movement of the zoom ring (not shown) from the shortest focal length position to the set focal length position. The data representing the absolute value of the set focal length specified and stored at this address is stored in the ROM (I(0,
) is output.

In this example, when data "1010" is output from the focal length information output device (FS), address "001010" is output.
10” is specified, and the data of lQ5mm is “10000
” is output. Note that here, the focal length data is only data that is commonly used, that is, focal lengths such as 50 mm, 85 mm, and 100 mm, which are common for fixed focal length lenses, but the address It is also possible to increase the number of bits of data and focal length data to obtain narrower focal length data.

ROM (reserve) address terminals (r7) to (ro)
The data corresponding to the address specification by the input data is R
It is output to output terminals (b4) to (bo) of OM (IQ). The output terminals (b4) to (
bo) is the input terminal (Lb7) of the shift register (81ζ)
) to (Lb3). Shift register (SR
4) a Other input terminal (Lb2).

(Lb, ), (Lbo) are grounded. This shift register (SR4), AND circuit (to 33)
, (AN3.) The circuit consisting of the flip-flop (1'T%) is the 7-foot register (SR1), AND circuit (AN2), and (AN3) on the camera body side in FIG. 5 mentioned above.

It has the same configuration as the circuit consisting of the Noritsubu flop (FF2), and the shift register (SR4) is connected to the clock terminal (CL>
At the rising edge of the clock pulse (CPL), the input terminal 5...
) to (Lbo) are taken in parallel, and when the input to the switching terminal (SP) is "ILOw +i, the data taken in at the rising edge of the clock pulse of the clock terminal 0) is serially output from the upper bit to the output terminal ( The Q output terminal of the flip-flop (1'F6) is connected to the switching terminal (SP) of this shift register (SR4), and the set input terminal of the Noritsubu flop (FF6) is connected to the AND circuit. The output terminal of (AN33) is connected to one input terminal of this AND circuit (AN33), and the terminal (1'L6) of the decoder (I-)E4) is connected to the other input terminal of the AND circuit (AN, ). to the clock terminal (
CPI,) is connected. Furthermore, flip-flop (F
The output terminal of the AND circuit (AN3) is connected to the reset input terminal of F6), and one input terminal of this AND circuit (AN34) is connected to the terminal (1"L?) of the decoder (L) E4).
is connected, and a clock terminal (CI'L) is connected to the other input terminal of the AND circuit (ANA4). This flip 70 knob (1!Fρ) is set at the falling edge of the clock pulse (CPL) output at the timing (TL6), and the falling edge of the clock pulse (CPL) output at the timing (''L7). (OFF in Figures 7 and 8). Therefore, the shift register (SR4) is reset at the output terminal (') of the decoder (DE4).
rL? ), input data in parallel at the rising edge of (TL
Data is output in series at timings o) to ("'6).

OR circuits (ORs) have a counter (C
O4) output terminal (CL3) is the inverter (INlo)
The other input terminal is connected to the Q output terminal (l!''D) of the flip-flop (FF7), and the output terminal is connected to the control terminal of the switch circuit (SC4).

This switch circuit (SC4) is a shift register (SR4).
) is connected between the output terminal (ou'r) and the terminal ("3). This OR circuit (O1t5) and the switch circuit (S
C'+) and the above-mentioned AND circuit (AN3o) and switch circuit (SC3), the flip-flop (
While the Q output (Fl)) of FLY) is 50w° (that is, when the fixed data of the lens is being transferred), the output terminal (CL3) of the counter ((1) 4) is “High”.
”, the switch circuit (SC3) is conductive and the terminal (JB3) is connected from the camera body side.

(JI, 3) is read into the shift register (SR3), and the output terminal (CL3) is read into the shift register (SR3).
) or LOWll, the switch circuit (SC4) becomes conductive and the data of 几0AI (deposit 1) is transferred to the terminal (JB3).
(J"3) to the camera body side. In other words,
几OM ([),) address data and ROM (IDI)
Fixed data from is input and output alternately. Then, the Q output (FLY) of the flip-flop (FI'7) is II1
When it becomes gh, the switch circuit (SC<) remains conductive, and the photographing distance data and focal length data of the ROM (IDI) are transferred to the terminal (JB3).

(JB3) and is transferred to the camera body side.

The operations of the interface circuit (ELF) shown in FIG. 5 and the data output section (7) shown in FIG. 6 will be explained below with reference to the time charts shown in FIGS. 7 and 8.

In the interface circuit (■ri), the output terminal (02) of the microcomputer (1) is
When it becomes ゛ (Fig. 7 02), the one-shot circuit (O8+
The flip-flop (FF+) is set by the pulse from ) (FIG. 7 OS, ), and the D flip-flop (1) is set at the rising edge of the next clock pulse (CPL).
, ) becomes “Ilight” (Fig. 7 DF1)
, the reset state of the counters (coha (■2), (CX-)3) is released, and the decoder (""2) r (DF
s) becomes ready for output. Also, Noritsubu flop (
When FF+) is set, a clock pulse (CPL) is output from the AND circuit (AN, ) (see Figure 7, CPL).
), this clock pulse (CPL) is the terminal (JB2)
, (J"2) to the lens side circuit in FIG. 6. On the other hand, in the data output section (7) in FIG. ) become ln and gMl, the power supply transistor (BT
2) (Fig. 1) conducts, and the terminals (JB+) and (J
Power supply is started via L+). When power supply starts via the terminal (JL+), the power-on reset circuit (
A pulse is output from 3), and the flip-flop (FF
7)l The D control flops (DFs) are reset at the rising edge of this pulse, and the flip-flops (F's
) is set at the falling edge of this pulse. and,
At the first falling edge of the clock pulse (CPL), the Q output of the D flip-flop (DFs) is 11 Hlg hl
1, the reset state of Color/R ((X)+) and ((1) 5) is released, and the decoder (No. 91 No. 4) becomes ready for output. This completes the preparations before starting operation.

Next, in the interface circuit (IF) of FIG.
It is taken into the soft register (SR, ) at the timing of B7). And the next (1'13o) to (TB?)
The switch circuit (801
) and end F-(JB:+), (J"a) data "000000 from shift register (srt,)"
10" is serially outputted to the data output section (7) on the lens side. In the data output section (7) in Fig. 6,
At this time, the switch circuit (SC3) is conductive, so the data is sequentially taken into the shift register (SR) at the falling timing of the clock pulse (CPQ) (Lag + La I, La2 in FIG. 7).

The data output from this shift register (SR,) is transferred to the ROM (fU,
) t:r) is sent to the address terminals (r6) to (ro) (SB, Lao, La+, La2 in Figure 7), and is sent to the ROM
([), ) to this address terminal (r7) to (r
Data at the address specified by the input data of step o) is output. The outputs (La 6 ) to (Lao) of the shift register (8113) in FIG.
) becomes "0000001" at the falling edge of the clock pulse at the timing of TIJ (Fig. 7 Lao, La
l, La2), IROM (Rol) is '000000
The address ``01'' is specified.The address ``11100'' is specified as the check data ``11100'' as shown in Table 7 above.
Chikaraina himself remembers this data “'11100” as 1
It is output from 10M (I(II-)+) and taken into the shift register (SR4) at the rising edge of timing (TL7). Next step (S2) timing (T
From LO) to (TR7), the output terminal (CP3) of the counter (υ4) becomes “LOW°”, and the subsequent timing (
At the rising edge of TLo) to (TR7), the terminal (Lb7)
The input data from (Lbo) to (Lbo) are sequentially sent to the switch circuit (S
C4) and the terminals (JL3) and ('B3) to the camera body (FIG. 7SB).

In FIG. 5, in the step (S2) where data is sent from the lens, the output (CP3) of the counter ((1) 1)
is LoW11, and the switch circuit (SC2) is conductive. Therefore, the terminals (JL3), (J
Check data ''1 transferred via B3)
1100" (Figure 7 SB) is the switch circuit (SC2)
is taken into the shift register (SR, 2) at the falling edge of the clock pulse (CP) (Fig. 7B).
bO to Bb,).

And the clock pulse ('l'B4) of timing ('l'B4)
CP), the output of this shift register (8R2) becomes '11100' (BbO to Bb4 in Figure 7).
) + (TBs ), the AND circuit (A
At the rising edge of the Norculus (AN5 in Figure 7) output from N5), shift register (SR2) to latch vertical (5).
The f-time from is latched. Then, at the timing (TR6), the data from the latch circuit (LA) is taken into the register (REG, ) at the rising edge of the output pulse of the AND circuit (AN, o) (FIG. 7, AN, o).

A pulse is output from the AND circuit (AN7) at the timing (1'''6) of step (S2), so that the counter (CO3) becomes "010", and at the timing (TR7), the pulse is outputted to the shift register (S''+). “00000100
” data is imported. Then, step (S3)
When this happens, the output terminal (CP3) of the counter ((1) 1) becomes "'High"°, the switch circuit (SC1) becomes conductive, and the output terminal (CP3) of the counter (co4) in FIG.
CP3) becomes “H1gh” and the switch circuit (S(
: '3) is conductive. As a result, the address data from the shift register (SR+) in FIG. 5 is transferred to the shift register (SR3) in FIG. 6, and this address data is transferred to the ROM (I(
0, ) is input to the address terminals (rO) to (rO). Then, at the rising edge of timing (TR7), R
The data of the open aperture value AvO stored at the address "00000010" of OM (RO,) is taken into the shift register (S R4).Here, the data of the A sell and are F3. in the example of Table 7. 4 (Avo=3.5) is data "00111°".

At step (S4), the terminal (CP3) of the counter (CO, ) and the terminal (CP3) of the counter (co4) are low.
When it becomes OW11, the switch circuit (SC1), (SC3
) becomes non-conductive and the switch circuits (S02) and (SC4)
conducts. Here, in the same way as described above, data "'00111" from the shift register (SR4) is transferred to the shift register (SR2), and this data is latched into the latch circuit (LA) at the timing of (TBs), and ( ”
At the timing of ``'6), the data of this open aperture value Av'0 is taken into the register (tomo 1) by the pulse (AN, , in Fig. 7) from the AND circuit (AN, , ).Then, in the same manner, '000001 in step (S5)
10°.

address data is sent to the lens, and the address data is sent to the lens.
The maximum aperture value AVm data is sent to the main unit (1”
At the timing of B6), the appropriate size is stored in the register (REG 2). In step (S7), the address data of 00001000" is sent to the lens, and in step (S&), the AVO data for the open aperture error is sent to the main body (T
It is taken into the register (REG3) at the timing of R6).

In step (S9), the address data of '00001010' is sent to the lens, and in step (Slo), the data of the shortest focal length fw is sent to the main body side, and is taken into the register (I-G4) at the timing of (TR6). .In step (So), the address data of "'00001100" is sent to the lens, and in step (812), the data of the longest focal length ft is sent to the main body side, and is taken into the register (REOs) at the timing of ("R6)". It will be done. This completes the reading of the lens color fixed data.

At the falling edge of the clock pulse (CI'L) at the timing (TR6) of step (S + +), the shift register <sz> (7) in FIG. 6 outputs (La2), (Lat),
(Lao) becomes “110” (Fig. 8 Lao, La+
, La2), AND circuit (AN
At the rising edge of the clock pulse (CPL) output from
) becomes Lowll. This allows the counter (C'
Regardless of the output state of the output terminal (CP3) of J4),
The output of the AND circuit (AN3.) becomes 'Low' and the output of the OR circuit (It5) becomes 'Light', making the switch circuit (S03) non-conducting and the switch circuit (SC4) becoming conductive. The data is simply sent to the camera body.

On the other hand, in the above step (S12), the longest focal length f
t data is transferred, and the AND circuit (A
At the same time, the above data is taken into the register (KEG5) by a pulse at the timing of (TBG) from N15), and at the same time, the output terminal (end l
) is used to set the Noritsubu flop (FF3) (Fig. 8 AI'J 156Hd l, k k
3) From then on, the output of the AND circuit (AN) is ``LOW'' regardless of the state of the n counter ((X), ) (7) output terminal (C50). The switch circuit (SC,) becomes non-conductive and the switch circuit (SC2) becomes conductive. Therefore, from now on, all you have to do is take in the deheta from the lens.

At the timing of step (S+z)O("L6) described above, the counter (CO5) in FIG.
), the output becomes 01 (Fig. 8, CaO, Ca1). This signal is input to the selection terminal (SL) of the data selector (MP2), and is output from the data selector (MP2). The data of the data input section (C2) is output, and the upper 4 bits of the ROM (I(0,) are "
0001", the lower 4 bits are the shooting distance information output device (
Address designation is performed by address data consisting of 4-bit data output from DS. This address area contains K, “0001” as shown in the example in Table 7.
0000”, the data “0101” represents 1.4m.
0” is memorized and “00010001” is 1
．． The data “01011°” representing 7m is “0001
1110”, the data “11000” represents 16m.
If " is 00011111", data "I 111 ]" representing the infinite photographing distance is stored.

This shooting distance DJ data is taken into the shift register (SR4) at the timing of (TL7), and is taken into the shift register (SR4) at the timing of (TL7).
At the falling edge of the clock signal (CP) from the timing (TBO) to (TB4) in S13), the signal is taken into the shift register (SR2) in Fig. 5 (Bb in Fig. 8).
It is latched by the latch circuit (LA) at the timing of o to Bb4) + (TBs), and is input to the register (KEG6) by the output pulse of the AND circuit (HA) at the timing of (TBG) (AN, 6 in Fig. 8). It is captured.

At the timing ("'L6) of step (814), the sixth
The counter (CO5) in the figure counts the pulses from the AND circuit (AN32) and the output becomes "10" (Cao, Cat in Figure 8), and the data from the data input section (C3) is output from the data selector (w2). By this,
ROM(R(Jθ) is addressed by address data consisting of 4-pit data output from the focal length information output device (FS), with the upper 4 bits being “0010” and the lower 4 bits being output from the focal length information output device (FS). , as shown in Table 7, if the focal length data is stored and the address is 'ooiooooo', f 5 Q7n
The data “01011°” representing n is “001010
If it is 10”, the data represents f105mm゛1ooo
o” is “00101111”, the data “10001°” representing f135mm will be OM (RO
L). This focal length data is taken into the shift register (S C4) at the timing (TL7) of step (813), and is input to the shift register (S C4) at the timing (TL7) of step (813).
”'Bs), the latch circuit (LAX
The register (RE) is loaded at the timing of (TBG).
G,). At this time, an AND circuit (ANl?
)'s output (end 2) sets the flip-flop (FF, ) ■Figure 8 ANIT end 2, FF4),
“1” is input to the input terminal (+3) of the microcomputer (1).
1igh11 signal. Microcomputer (1
) determines that reading of lens data is complete when the input terminal (+3) becomes H1gh", and turns the output terminal (02) to LOW" to stop power supply to the lens. let This completes the data transfer from the lens to the interface on the camera body side.

Next, the microcomputer (1) starts reading the above-mentioned data read into the interface circuit (IF). Output port of microcomputer (1) (
0'3) is "5)i", the output terminal (ao) of the decoder (DEt) in Fig. 5 becomes "High", and this output terminal (ao) becomes the chip select terminal (
Check data from the register (KEGo) connected to (2)) is output to the data bus (DB) (Fig. 4) via the data selector (MP, ), and this check data is sent to the microcomputer (1). Loaded. Next, the output port (O
When the data of F2) reaches 6H°, the decoder (DEL)
The output terminal (al) of ) becomes "Iligh", and the data from the register (RE(3,) connected to the chip select terminal (aS) is transferred to the data selector (MP, ). is output to the data bus (DB) via the data bus (DB) and read into the microcomputer (1).
7) is sequentially read into the microcomputer (1) via the data bus (]) DB, and when all the data has been read, the next Move to action.

The circuit configurations of the shift register (SR+) in FIG. 5 and the shift register (SR,) in FIG. The output terminal of the flip-flop to which the data of the lower bit is preset is immediately connected to the input terminal of the flip-flop to which the data of the upper bit is preset, and
The output terminal of the flip-flop to which the data of the most significant bit of each solid-flop is reset is connected to the input terminal of a ninth flip-flop other than the above-mentioned solid-flop, and the output terminal of this ninth flip-flop is The terminal becomes the output terminal 7 (ot+i") of the shift register. The data preset in the eight flip-flops is sequentially transferred from the lower bit to the upper bit in synchronization with the clock pulse, and then the data is transferred to the ninth flip-flop. The data of the most significant bit of the above eight Noritsubu flops is preset to the Tsubuflop.The output of the flipflop is taken in.
This data is output to the output terminal (OUT).

Next, a specific example of the switch (LS) for detecting that a lens is attached to the camera body will be described.

FIG. 9 shows a state in which the lens is not attached to the camera body, and FIG. 10 shows a state in which the lens is attached to the camera body. In FIGS. 9 and 10, (2) is a body portion forming the camera body, and (21) is a seat plate on which a lens is attached.

(Two are the lock parts, and this lock member (passes through the two-side seat plate (21) and is pushed upward by the barrel 23), and when a lens is not attached, this lock part 4t (22 ) projects above the seat plate (21). (24) is a guide groove for lens attachment, (25) is a lens attachment detection pin, and this detection pin
5) passes through the seat 4f (21) and is pushed upward by the bar
protrudes upwards. (27) and (28) are the switches (i and s side contact pieces, and as shown in Fig. 9, when the lens is not attached, the detection bead 25) is pushed upward, so that this contact ”K27), (28
) is not in contact and the switch (LS) is in an open state.

In the figure, the bayonet contact surface of the lens (LE) indicated by the two-dot chain line is provided with an old capital 31) for locking and a convex metal [3] for notifying attachment. Camera body and lens (I/E
) and the mounting instruction mark (not shown) are aligned, it will be in the state shown by the broken line, and the lock part (22) will be pushed by the bayonet contact surface of the lens (there are two positions, 32) is at the position 1 3'3 as shown by the broken line. From this state, when the lens (LE) is turned in the direction of the arrow (x), the notification convex part (3 exposure) pushes the slope of the upper end of the detection pin (25), and the pin 5) becomes the barge 26). He resisted and was pushed down towards Botibuko 2■ side. This allows the pin (
The protruding part of 25) comes into contact with the joint force and the joint 7) and the joint [2]
8) and the switch (LS) 7E is closed. On the other hand, the locking member c22) has a bayonet contact surface rotation of 1 (3).
]) and locks the lens in place. As described above, the switch (LS) is closed when the lens is attached to the camera body and locked.

The embodiments of the present invention detailed above can be modified as follows. That is, most of the functions of the aperture and exposure time control section can be performed by the microcomputer (1), and the number of external circuit components can be reduced. Well, if you read the data that has already been read into the interface circuit (IF) into the microcomputer (1) while reading the data serially into the interface circuit (IF), it will be impossible to read the data into the microcomputer (1). time can be further reduced.

Furthermore, the above-described embodiment can be modified as follows. Microcomputer (1) C, switch (
LS) 752 was closed and Mizuko (14) entered the car.
”, the fixed data from the lens is read into the intern ace circuit (IF) regardless of whether the photometric switch (MS) is opened or closed, and this data is stored in the interface circuit (IF).

Then, when the photometry switch (MS) is closed, it starts reading variable data from the lens to the interface circuit (■), and then starts A-D conversion to adjust the exposure time set on the camera body. data such as film sensitivity, etc.
A microcomputer (1) reads the A and -D conversion values of the photometric output, the aperture level value of the lens, and the variable data of the color lens of the interface circuit (IF), and performs exposure calculation and display. And a microcomputer (
In step 1), it is determined again whether the photometric switch (MS) is closed, and if the switch (MS) is closed, reading of variable data from the lens is started again, and the same operation is performed thereafter. And the lens device switch (
The photometering switch (MS) is turned off when the LS) is not closed.
is closed, the interface circuit (1F)
The microcomputer (1) reads the data set on the camera body side and A~
The exposure calculation is performed by reading the D conversion value. In this case, in the interface circuit shown in FIG. 5, when reading the variable data after the fixed data has been read, the counter (cO3) changes to 101°.
゛ is reset to 110 at the timing of (''B6), and in the next step address data ゛00001 according to the output of the counter (C03) is reset.
100" to the lens side. In this way, the longest focal length data ft is input first, but after that, the set shooting distance data and the set focal length data are input. Please note that (In this case, one piece of fixed data called ft is sent, but variable data is repeatedly read into the interface circuit (IF).

In the above embodiment, the case where the interchangeable lens is attached directly to the camera body has been described, but some camera accessories include intermediate rings, bellows, and telephoto lenses that can be detachably attached between the interchangeable lens and the camera body. There are so-called lens adapters such as converters, and the case where an interchangeable lens is attached to a camera body via such a lens adapter will be described below. There are two types of lens adapters mentioned above: one that has an aperture interlocking mechanism and mechanically transmits aperture information set on the interchangeable lens to the camera body, and the other that does not have an aperture interlocking mechanism and does not transmit aperture information. The former is provided with a convex metal plate 2 for closing the switch (LS) shown in FIG. 10, and the latter is not provided.

Now, a lens adapter without an aperture interlocking mechanism has a convex part (3
2), the switch (LS) remains open even when the lens adapter is attached to the camera body.
The microcomputer (1) performs the same step -1 as when no lens is attached. -17, -+148°IL
19 Performs 0 flow operations. On the other hand, a lens adapter with an aperture linkage has 32) for 6 sounds, so when the lens adapter is attached to the camera body, the switch (
LS) is closed, and the microcomputer (1) performs the operations from step #20 onwards. here,
Since the interchangeable lens is attached to the camera body via a lens adapter, lens check data is not transmitted to the camera body.

Therefore, if it is determined that no check data has been input, the process moves to exposure calculation based on aperture metering in step #18, but if the automatic exposure control mode is set, the set aperture signal Performs exposure calculation for the aperture priority exposure time automatic side m based on the aperture step number data AV8-Av'O output from the output device (As),
When manual exposure control mode is set, exposure control is performed based on the set aperture value and exposure time. In addition, the lens adapter is provided with an output section for data indicating the type of the adapter and a signal line that electrically connects the camera body and the interchangeable lens. The data may be transmitted to the camera body, and the exposure calculations from step #30 onward may be performed using the type data of the lens adapter and data from the interchangeable lens.

Further, in the above-described embodiment, the mode is switched depending on whether there is a lens attachment signal or not, that is, when the switch (LS) is closed, but this can be modified as follows. That is, the lens attachment detection switch (LS
), the lens data is always read when the photometry switch is closed, it is determined at this time whether the check data has been read, and the mode is switched based on this result. good.

Further, in the above embodiment, the microcomputer (1)
The microcomputer operates constantly, but running the microcomputer all the time consumes a lot of power, and the power supply battery (BA)
The problem is that it wears out quickly. Therefore, depending on the functions of the microcomputer used, the program may be configured in advance so that the microcomputer does not operate when it is not needed. Since this can be easily realized by a person skilled in the art, it will be omitted to give an example of a specific microcomputer and show a program suitable for that microcomputer.

Furthermore, in the above-described embodiment, an interchangeable lens is used as a camera accessory, but the present invention is not limited to data exchange between an interchangeable lens and a camera body; In addition, the exposure control data calculated by the camera body may be controlled by attaching an accessory such as a strobe, motor drive, data pack, or lens accessory.

Effects As described in detail above, in the present invention ((), by detecting the presence or absence of a wearing signal that is emitted in connection with wearing an interchangeable lens, the exposure calculation means can detect at least the first exposure signal based on the data of the interchangeable lens. Since either the exposure calculation or the second exposure calculation based on data other than the data of the interchangeable lens is performed, when the interchangeable lens is not attached or is not attached correctly, the Since exposure calculation is performed based on data other than data, erroneous exposure calculation results will not be obtained, and furthermore, even if exposure control is performed using this calculation result, inappropriate exposure will not occur.

Furthermore, according to the embodiment of the present invention, the electric signal output from the interchangeable lens is not read when the interchangeable lens is not correctly attached, so that incorrect data of the interchangeable lens is input to the exposure calculation means. This eliminates the inconvenience of Furthermore, if the interchangeable lens is provided with a fixed storage means such as an OM, and exposure calculations are performed based on a plurality of pieces of data from this fixed storage means, multiple types of exchange data can be stored in a specific address of the fixed storage means. Common specific data is stored in the lens, and when this specific data is not input, exposure calculations are performed without using data from the interchangeable lens, which prevents data from being input by mistake. Even if exposure control is performed, inappropriate exposure will not occur.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the microcomputer (1) shown in FIG. 1, and FIG. 3 is a set aperture stage number signal output device (As ), Figure 4 is a graph showing the relationship between the number of aperture stages of the interchangeable lens and the actual aperture, and Figure 5 is the circuit diagram of the
Figure 6 is a circuit diagram of the interface circuit (IF) in Figure 1, Figure 6 is a circuit diagram of the data output section (7) in Figure 1, Figures 7 and 8 are circuit diagrams of the data output section (7) in Figure 1.
The figure is a time chart showing the state of the main parts of the circuit in Figures 5 and 6, and Figures 9 and 10 are the switch (L) in Figure 1.
It is an explanatory diagram showing operation of S). (1) Microcomputer, (5) Exposure control data output section, (7) Data output section, (9)...Variable data output section, 0 aperture setting ring, 03...Aperture ring, aS replacement Lens, (15a)...Aperture pin, (LS)...Switch, (IF)...Interface circuit, (ME)...Photometering circuit, (A
D), A-D converter, (As)・Setting aperture value signal output device, (TS)・Exposure time signal output device. (SS) Film sensitivity signal output device, (MS)
Mode signal output device, (MJ',), (MP2)...
・Data selector. (IJ) 3) Data bus, (DS Le shooting distance information output device. (FS)... Focal length information output device, (COM),
(PAO), (P person). (PA2), (PA3), (PA4)...Conduction pattern, (iol)・ROM. (SR+), (S几z), (SR3), (SR4
)...Shift register register, (FL)...Flash light emitting device. Special ¥1 Applicant Minolta Camera Co., Ltd. Agent Patent attorney Aoyama Ao and two others Figure 9 Figure 10 Procedural amendment (voice) December 27, 1980 Director General of the Patent Office 1, Indication of the case 1982 Patent Application No. 095183 2 Name of Invention Interchangeable Lens Camera 3 Relationship with the Person Who Makes Correction Patent Applicant Address 4, Osaka Tadashi 1-Ki Building, 2-chome Azuchi-cho, Higashi-ku, Osaka
Agent 7, contents of correction: Figures 5 and 6 will be corrected by combining sword + ffi.

Claims (9)

[Claims] (1) A data reading means for reading the data of the interchangeable lens to be attached, and the data of the above-mentioned interchangeable lens read by the data reading means and the data set or measured on the camera body side are input, and the input data is an exposure calculation means for performing a predetermined exposure calculation based on the lens; a detection means for detecting the presence or absence of a mounting signal that is emitted in connection with lens mounting when data of the interchangeable lens can be transmitted to the camera body; When the signal is detected, at least a first exposure calculation based on the data of the interchangeable lens is performed. 1. An interchangeable lens camera, comprising: calculation control means for controlling the exposure calculation means to perform a second exposure calculation based on data other than the data of the interchangeable lens when a mounting signal is not detected. (2) The interchangeable lens has an aperture setting member whose aperture value is manually set, and the data reading means includes a movable member that moves mechanically in conjunction with the aperture setting operation of the aperture setting member; The interchangeable lens camera according to claim 1, further comprising a signal output board that outputs an electric signal corresponding to the moving position of the member. (3) The camera includes a photometry device that measures the subject brightness through the open aperture of the interchangeable lens and outputs data according to this measured value, and a film sensitivity setting device that outputs data according to the set film sensitivity. The first exposure calculation in the exposure calculation means is an exposure calculation based on data from the data output means, the photometry means and the film sensitivity setting means, and the second exposure calculation is based on the data from the photometry means and the film sensitivity setting means. The interchangeable lens camera according to claim 2, wherein the exposure calculation is based on data from the setting means. (4) The interchangeable lens includes a fixed storage means in which a plurality of pieces of data to be used in the camera body are fixedly stored in a plurality of addresses, an addressing means for specifying an address of the fixed storage means, and the addressing means. and data output means for outputting data stored at an address specified by. The interchangeable lens camera according to any one of claims 1 to 3, wherein the mJ data reading means reads the data output from the data output means. (5) Data corresponding to the shooting distance to the subject is fixedly stored in the fixed storage means of the interchangeable lens, and the camera has means for inputting a light emission ready signal output from the flash light emitting device, and the camera 5. The interchangeable lens camera according to claim 4, wherein the first exposure calculation in the exposure calculation means when the preparation completion signal is input is an exposure calculation based on shooting distance data. (6) Claims 1 to 5, wherein the detection means includes a switch that is provided within the camera body and that issues a first attachment signal when the connection state is switched in response to attachment of the interchangeable lens. An interchangeable lens camera listed in any of the above. (7) The camera has a calculation command signal output means for outputting a calculation command signal that instructs the calculation operation of the exposure calculation means iiJ, and the data reading means is iS? Claim 6, wherein data on the interchangeable lens is read in response to a calculation command signal output from the calculation command signal output means when the first wearing signal is detected by the detection means. Interchangeable lens camera. (8) Specific data common to multiple types of interchangeable lenses is fixedly stored at a specific address in the fixed storage means of the interchangeable lens, and the detection means determines whether or not the specific data exists via the data reading means. The interchangeable lens camera according to any one of claims 4 to 6, further comprising data discrimination means for emitting a second mounting signal. (9) The camera has a calculation command signal output means for outputting a calculation command signal that instructs the calculation operation of the exposure calculation means, and the data reading means receives the calculation command signal output from the calculation command signal output means. 9. The interchangeable lens camera according to claim 8, wherein the interchangeable lens data is read in response to the above. (lO) The calculation control means controls the exposure calculation means so as to perform the first exposure calculation only when both the first and second attachment signals are generated from the detection means. The interchangeable lens camera described in item 9. (11) The interchangeable lens camera according to any one of claims 1 to 10, wherein the exposure calculation means and the calculation control means are microcomputers.