JPS58184935A - Data reading device of camera system - Google Patents

Abstract

PURPOSE:To shorten the time required for read to obtain quickly an exposure factor control data, by providing an interface circuit, which reads data transmitted in serial and converts it to parallel data, and a microcomputer, which performs the exposure operation on a basis of read data, in the camera body side. CONSTITUTION:In the camera system where data is outputted from a camera accessory to the camera body side in series and a microcomputer 1 provided in the camera body side performs the exposure operation on a basis of this serial data, serial data from the camera accessory is read and is converted to parallel data by an interface circuit IF. Therefore, it is sufficient if data designated by an address designating means is read in serial, and the operation of designation is omitted to shorten the serial data read time, and the microcomputer designates and reads desired data out of data, which is preliminarily read and converted to parallel data by the interface circuit, in parallel to perform the exposure operation to shorten the read time.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to various data (
The present invention relates to a data reading device in which a fixed storage means for fixedly storing data such as the open aperture value and maximum aperture value of an interchangeable lens is provided in a camera accessory, and the data of the camera accessory is read on the camera body side.

In such a device, the above-mentioned data of the prior art camera accessory is converted into multiple bits and all the data is transferred simultaneously or in parallel for each data. When transmitting data to the side, a considerable number of connection terminals are required (for example, the number of connection terminals for each piece of data is equal to the number of bits), and depending on the number of connection terminals, the camera body and camera accessories -
There was a problem. Therefore, we will discuss these problems in 11
,.

To solve this problem, a device was proposed in Japanese Patent Laid-Open No. 1983-1983 in which the data receiving terminal (transfer/transmission) was combined into one terminal, and the data of the camera accessory was serially sent one bit at a time to the camera body through the terminal. -108628. In this device, a microcomputer or microprocessor that sequentially controls the operation of the camera is provided on the camera body side, and the above-mentioned terminal for transmitting data of the camera accessory is directly connected to its serial input terminal. The microcomputer sequentially reads data sent from the camera accessory bit by bit.

However, this method of serially reading data one bit at a time takes much longer than the method of reading all bits of data simultaneously in parallel, and microcomputers operate in a sequential manner. Due to the nature of this process, it takes a considerable amount of time to read all the data from the camera accessory. In particular, in a camera system configured to calculate exposure factor control data using a microcomputer based on camera accessory data, exposure factor control data may be Since it takes a considerable amount of time (for example, 02 to 03 seconds) until the value is calculated and appropriate exposure control becomes possible, there is a drawback that a precious photo opportunity is missed.

Purpose An object of the present invention is to provide a camera system in which various data of camera accessories attached to a camera body are sent in series to the camera body side, and exposure factor control data is calculated on the camera body side based on this data. An object of the present invention is to provide a data reading device that can quickly obtain exposure factor control data by shortening the time required to read data from a camera accessory.

Summary The present invention provides a camera accessory attached to a camera body.
The camera accessory is configured such that a plurality of data related to the camera accessory is fixedly stored in advance on the camera body, and the data is serially transmitted bit by bit to the camera body, and the data transmitted in series is transmitted to the camera body. An interface circuit that reads the data and converts it into parallel data, and a microcomputer that reads this parallel data and performs exposure calculations based on the read data are installed on the camera body side, and after the serial data is once converted into parallel data, the microcomputer The above data is manually processed in parallel to perform exposure calculations.

Embodiment FIG. 1 is a block diagram showing the overall circuit configuration of a camera system to which the present invention is applied, using an interchangeable lens (LE) as a camera accessory. Note that among the signal lines shown in FIG. 1 and FIG. 7, which will be described later, the bold line portions are signal lines through which multiple bits of data are transferred. In the figure, (1) is a microcomputer or microprocessor (1) that sequentially controls the overall operation of this camera system.
(hereinafter referred to as μmC0m). The power-on reset circuit (POI) is powered by a battery (BA) in the camera body.
When installed, a power-on reset signal (PRt) is generated, and this signal (PRY) is applied to the reset terminal (RE), thereby resetting μmcom (1). The oscillation circuit (OSC) uses the reference clock pulse (cp)
This clock pulse is μmcom (
19 clock input terminals (CL) and each other block, and this clock pulse (CP) causes the first
The circuit operations of the entire camera system shown in the figure are synchronized. The display unit (DP) is composed of, for example, a liquid crystal that is driven in a time-division manner, and displays the exposure control value and controls the exposure based on signals from the μ-com (11 segment terminals (SEG) and common terminal (COM)). This is a display section that displays control modes, warnings, etc.The above μmeom(])
22 oscillator (osc), display unit (DP), interface circuit (IF) to be described later, data selector (MPI)
).

Power is supplied from the power line (+E) directly connected to the inverters (INI) to (INS), the antenna circuit (ANO) of the inverter, and the power supply battery (BA).

The switch (MS) is a photometry switch that is closed in conjunction with the photometry operation, and when this switch (MS) is closed,
11・□, 1 and μmcom (The input terminal (11) of 31 receives the N old g h// signal through the iraverter (INI), and μ-com (11 reads data for exposure control, photometry) The A-D conversion operation, exposure calculation, and display operation of the output are started.In addition, when the photometry switch (MS) is closed, the power supply transistor (BTl) becomes conductive, and the power supply line ('E) is connected. Power is being supplied. Power is supplied to the circuits inside the camera body other than the circuits mentioned above from the power supply line (+V B ) via the power supply transistor (BTI). Furthermore, power supply from the power supply line (-←VB) is started. A reset signal (PH1) is output from the power-on reset circuit (PO2), and this signal is input to an exposure time control device (CT) and an aperture control device (CA), which will be described later, to reset each device.

A block (3) surrounded by a broken line is an exposure control section, which is composed of an exposure time control device (cT), an aperture control device (CA), and a pulse generator (PG). Exposure time control device (CT) receives calculated or set exposure time data Tv from the output terminal (OPI) of μmcom (11), and the translation device (CT) uses this data Tv.
The time corresponding to v (ie, the time from opening to closing of the shutter, 2-Tv) is created based on the clock pulse (CP), thereby controlling the exposure time. The aperture control device (CA) has p-cow (11 output terminals (OP2
) Calculated or set number of refinement stages data Av
-Av'o (the meaning of this symbol will be described later) and a pulse from a pulse generator (PG) are input.

The pulse generator (PG) outputs a number of pulses corresponding to the amount of rotation of the aperture ring (13) provided on the camera body side. Here, the projection of the aperture ring (13) is brought into contact with the aperture pin (15) on the lens (LE) side when the lens is attached, so that the aperture value of the lens (LE) becomes the open aperture value. ) is biased by a spring (not shown). On the other hand, the aperture pin on the lens side (15
) is biased toward the maximum aperture value by a spring (not shown) on the lens side with a spring force weaker than the spring on the camera body side. With this mechanism, as the aperture ring (3) rotates, the aperture pin (15) is rotated by the same amount as the amount of rotation.
rotates, and the aperture of the lens (LE) is narrowed down from the open aperture value by the amount of rotation of the aperture pin (15). Therefore, the aperture control device (CA) is the aperture link 1G)
The number of pulses from the pulse generator (PG) corresponding to the number of aperture stages of the lens (LE) accompanying the rotation of the lens (LE) is counted, and this count value is combined with the output terminal of μmcom (31).
Data of the number of refinement steps from OP t ) Ay −Av
o and when they match, the rotation of the aperture ring (13) is stopped to control the aperture aperture.

The switch (LS) is a switch that detects whether or not an interchangeable lens (LE) is attached, and is released when the interchangeable lens (LE) is attached to the camera body and locked, but no release tag is attached. By closing this attachment detection switch (LS), a signal from the air body gh# is inputted to the input terminal (i4) of g-com (31) via the inverter (IN40), and μmcom (11 is the attached lens ( When the input terminal (i4) is set to LSLO, 1F by opening the attachment detection switch (LS), the lens data is read and other calculations described later are performed. A specific example of the mechanism for operating this lens attachment detection switch (LS) is shown in Figures 2 and 3. Figure 2 shows the lens (LE) not attached, and Figure 3 shows the lens (LE) not attached. In the figure, (20) is the body part of the camera body, (21) is the seat plate to which the lens (LE) is attached. (22) is the locking member, which is attached when the lens is not attached. When installed, the spring (
23) protrudes from the seat plate surface. (24)
(25) is a guide groove for lens mounting, and (25) is a mounting detection pin, and this detection pin (25) projects into the guide groove (24) by a spring (26) when the lens is not mounted. One contact piece (27) of the attachment detection switch (LS) is provided at the bottom of this detection pin (25) so that it can come into contact with it, and as shown in FIG. 2, when the lens is not attached, the detection pin (25) Due to the protrusion of the two contact pieces (27), (
, 28) are not in contact with each other, and the attachment detection switch (LS) is open.

In FIG. 3, the bayonet abutting surface of the lens (LE) indicated by the two-dot chain line is provided with a locking recess (31) and a lens mounting notification convex portion (32). The state when the mounting instruction marks (not shown) of the camera body and lens (LE) are aligned is shown by broken lines (22') and (32'), and the locking member (22) is on the 1 bayonet contact surface. Nyo 9-Cyu ah wa, (22'). □Do:゛Mouse 1
0, 2 A 0. .

The intellectual protrusion (32) is at the position (32). When the lens is rotated in the direction of the predetermined lock position from this state, the detection convex part (32) moves in the direction of the arrow (X), and the convex part (32) moves in the direction of the arrow (X).
32) pushes the slope at the top of the detection pin (25), and the pin (
25) is pushed down toward the body (20) of the camera body against the bias of the spring (26). By this, hij/
(25) is connected to the contact pieces (27) and (28) as shown in Figure 3.
and the switch (LS) is closed. At this time, the locking member (22) protrudes into the four parts (31) of the barnet abutting surface of the lens (LE), and the lens mounting state is locked. Note that this lock release is performed by operating a known lock release mechanism (not shown) to lower the lock member (22).

In Figure 1, the block (5) surrounded by a broken line is the hand (A
D), a set aperture value signal output device (AS), a set exposure time signal output device (TS), a film sensitivity signal output circuit (SS), and a mode black number output device (MS). The photometry circuit (Mg) is a photometry circuit that performs, for example, TTL aperture average photometry, and outputs an analog signal of B marker Avo corresponding to the subject brightness and the aperture value of the lens. The analog-to-digital converter (AD) is μm com (1
When a pulse of ss H1g h// is output from the output terminal (03) of 1, the analog signal from the photometry circuit (ME) is converted into a digital signal based on the clock pulse (cp).

This AD-converted data By -Avo is given to the input terminal (IF5) of the data selector (MP I ).

The set aperture value signal output device (AS) outputs data Ay corresponding to the set position of the aperture setting ring (11) of the lens (LE).
s-Avo to the input terminal of the data selector (MPl) (
Output to IF5). A specific example of this output device (AS) is shown in FIG. In Fig. 4, the sliding member (VT
) is set at a position corresponding to the setting position of the aperture setting ring (Jl) (any one of ■ to ■), and a member integral with it is set by a mechanical lick of the aperture setting ring (11) on the lens side. It is locked at the position corresponding to the setting. The conduction pattern (CT) is grounded, and the other conduction patterns (PAO) to (PAa) are connected to the power supply line (+VB) through respective resistors. Therefore, the contact piece of the sliding member (VT) connects the conductive pattern (PAO) to (P
A4) When it comes into contact with any of the
) to (PA4) are selectively short-circuited to the conduction patterns (CT), and the inverters (lN20) to (lN20) connected to these conduction patterns (PAO) to (PA4), respectively.
N24) selectively becomes % p Hg hI+. On the other hand, the contact piece of the contact member (VT) is connected to the conductive pattern (PA).
When not in contact with O) to (PA4), the inverter (
The outputs of lN20) to (lN24) are both %Low
'become. The output of the inverter (IN24) is connected to one input of the exclusive OR (EO3) and the terminal (d4) of the input section (IF3) of the data selector (MPI).
and is connected to. The output of the inverter (IN23) is connected to the other input of the exclusive OR (GEO3), and the output of this exclusive OR (EO3) is connected to the terminal (d3) of the input section (IF5) and the exclusive OR (EO2). ) is connected to one input. The output of the inverter (lN22) is an exclusive OR (EO2)
) is connected to the other input of the exclusive OR (E
The output of O2) is connected to the terminal (d2) of the input section (IF5) and one input of exclusive OR (EOl). The output of the inverter (lUN2t) is connected to the other input of the exclusive OR (EOl), and the output of the exclusive OR (EOI) is connected to the manual i1 (IF5
) terminal (dl) and one input of exclusive or (EOo). Then, the inverter (l
The output of the exclusive or (EOO) is connected to the other input of the exclusive or (EOO).
The output of data selector (MPl) is manually @ (IF5
) terminal (dO).

The conduction patterns (PAO) to (PA4) are gray codes, and the inverters (lN2O) to (IN24) at each position ■ to @ are related based on this code.
The relationship between the input of and the output of terminals (dO) to (d4) is shown in Table 1.
It is shown in the figure below. Further, Table 2 shows the relationship between the output of the terminals (dO) to (d4) and the number of narrowing stages at each position.

(Cooking margin) ::1': Table 1 Table 2 Below are the setting aperture value and the setting position of the sliding member (VT).
Explain the relationship with @. For lenses from Fl, 2 to F22, the aperture setting ring (11) is set to Fl, 2 (Av=
Q, 5), the sliding member (VT) is in the position ■, and the terminals (d4) to (dO) output data ゝゝoooooo'' with the number of stages of diaphragm being 0, and Fl, 4
If it is set to (AV=1), the sliding member (VT) will be
, the data '00001' with the number of refinement stages of 0.5 is output from the terminals (d4) to (dO).F 19 (AY=8.5) is set in the same manner. If so, data '10000' indicating the number of refinement stages is 8 is output from terminals (d4) to (dO), and F
When set to 22 (AV=9), the number of refinement stages is 85.
Data ``10001〃 indicating
2.41F2.8 +F3.41F 4. ;F4
．． 7, that is, when converted to Av, AIF=0.
If it is an integer multiple of 0.5, such as 5, 1.1.5, 2, 2.5, 3, 3.5, 4°45, data indicating the number of refinement stages can be output using the 5-bit data mentioned above. It is.

By the way, some interchangeable lenses have a maximum aperture of F2 or F5.
(AV=2.64), F 3.5 (Av=:3,5
1), F 1.8 (Av=1.7), F 4
．． 5 (AV=4.34), F 6.3 (AV=5
．． 31) There is an interchangeable lens that deviates from the 0.5 Ema unit. When such an interchangeable lens is attached, data on the number of aperture steps in units of 05 Ev is output from each position based on the position ■ with the following value.
The set aperture value obtained by calculating the data on the number of stops and the data on the open aperture value that is output separately is in Q, 5 Ev units as described above. Not only does it not match the numerical value of the index indicating the aperture value, but the actual set aperture value and the calculated aperture value are different, resulting in an exposure error. In addition, for such a lens, the index value of the set aperture corresponding to position ■ and beyond, excluding the open aperture position ■, is p 5.6
, pB, etc., in the usual 0.5Ev unit. Furthermore, the open aperture value data is 0.5EV
Since it is not a unit, the number of bits for outputting open aperture value data also increases.

Also, when attaching a lens whose maximum aperture value is not set in units of 0.5 Ev as described above, only the click position corresponding to the maximum aperture value is changed from the unit of ::・, :j 05 Ev of the maximum aperture value. It is possible to change the position from ■ according to the amount of deviation, but in order to read the amount of change from the shifted open position to the position ■, it is necessary to increase the number of bits of the conduction pattern, and the code pattern Problems arise in that it becomes complicated and the area of the board for the code pattern also increases.

Therefore, in this system, when the aperture setting ring (1) of a lens whose open aperture value is not set in units of 0.5 Ev as described above is set to the open aperture, the sliding member (VT) is At the next click position (■ position), set the aperture value in units of Q, 5 Ev. To give a specific example, if the open aperture value is F2.5 (AV=2.64), the set aperture value is set to F2.8 (All=3) at the position (■). Therefore, even though the number of stops from the position ■ to the position ■ is not 036, the data "0000" corresponds to stopping down by 0.5 stops from the open aperture.
1'' is output.Then, as data for the open aperture value of the interchangeable lens, data of Q, 5 Ev units is inputted, and in the case of this interchangeable lens, Q, 5 Ev units. F2.4 (Av=2.5
) is input, and the actually set aperture value is obtained from this number of stops and the data of the open aperture value. Therefore, it is possible to accurately read the data of the set aperture value at positions other than ■. Moreover, the sliding member (
VT) is located at the center of the code pattern corresponding to each code value, so reading errors due to rattling of the sliding member (VT) do not occur.

Next, the open aperture data is the aperture value at 05 stops from the aperture value at the position of the interchangeable lens (in the above case).
The data for F 2.4 (AY-25) and the data for the difference (0,14) between this maximum aperture value and the actual maximum aperture value are input separately from the interchangeable lens, and from these two data I am trying to get data on the actual open aperture value. Therefore, the number of bits of each data does not increase.

A general explanation of the above is as follows.

Ays is the set aperture value, Avo is the actual open aperture value, ■
Set the aperture value on the 05th open side from the
: Let the difference in Avo be △AVO 4. First, lens (LE)
Data on the number of aperture stages Avs- is sent from the set aperture value signal output device (As) through the aperture setting ring (11) of
Avo can be obtained, and Av can be obtained directly from the interchangeable lens (LE).
Data of o and △AvO are sent. As will be described later, even though these two data are fixedly stored in the data output section (Figure 1) in the interchangeable lens (LE), based on these three data, (Avs -Avo) +A
vo = Ay@=-(11Avo ten △Avo
= Avo
・If you perform the calculation of -a 2),
The set aperture value Avs and the actual open aperture value Avo are obtained.

Note that this is an interchangeable lens that has a mechanical configuration such that the aperture pin (15) does not move any further once the aperture pin (15) is narrowed down to the position set by the aperture setting ring (11), that is, the aperture setting ring. The amount of rotation of (11) and the amount of one rotation of the narrowing pin (15) are equal. When applying this system to interchangeable lenses, the following measures are required. The amount of movement from the position (2) to the position (2) corresponds to Q, 5 Ev, but the actual number of stops of the aperture must be varied depending on the interchangeable lens. That is, if the open aperture value is F2.5, it is 036 steps, F3.5
If so, it needs to be 0.39 steps, and if it is Fl, 8, it needs to be 0.3 steps. Therefore, due to the mechanical structure inside the interchangeable lens, while the aperture pin (15) moves from the position of ■ to the position of ■, the actual aperture is narrowed down by 0.36 stops for an F25 lens, from ■ to ■, and from ■ to ■. (Similarly below), the actual diaphragm is narrowed down by 05 stages, which is equal to the movement amount of the diaphragm pin (15). The graph in FIG. 5 shows the relationship between the amount of movement of the aperture pin (15) and the actual aperture value of the aperture.

In FIG. 5, the vertical axis shows the actual aperture value of the aperture, and the horizontal axis shows the amount of movement of the aperture pin (15).

The one-dot chain line is a graph showing the case of a lens with an open aperture value of F2 (AV=2), and as the aperture pin (15) moves, the actual aperture is gradually narrowed down from F2. Therefore, if the planned aperture value is At, then
Since △Avo=Q, (Ay −Ay'.(=Avo
)) and the data on the movement amount of the narrowing pin (15), and when the two match, the narrowing pin (15) is
If the movement of step 5) is stopped, the actual aperture will be controlled to the planned aperture value Ay.

In the case of the lens, the actual aperture value of the aperture remains at the open aperture value while the aperture pin (15) moves by an amount corresponding to Avo, and the aperture value is misplaced corresponding to ΔAvo.

The diaphragm mechanism of the lens is configured by a known cam mechanism so that when the diaphragm lever (15) moves, the aperture value is narrowed down from Av'o by an amount corresponding to the movement. Therefore, even in the case of such a lens, the A v'o data and the aperture pin (I5)
The aperture can be controlled by comparing the data on the amount of movement of the aperture pin (15) and when the two match, the movement of the aperture pin (15) is stopped.

The configuration of FIG. 1 will be explained again. The set exposure time signal output device (TS) is a device that outputs digital data corresponding to the exposure time manually set by the exposure time setting member (not shown) of the camera body, and this output is sent to the data selector (MPI). is connected to the input terminal (IP4) of

The film sensitivity signal output device (SS) is a device that outputs digital data corresponding to the film sensitivity manually set by the film sensitivity setting member (not shown) of the camera body, and this output is sent to the data selector (MP1). ) is connected to the input terminal (IPS) of the The mode signal output device (MS) is used to control the exposure control mode manually set by the mode setting member (not shown) on the camera body or from the flash light emitting device (FL) to the flash light emitting device (F side terminal (JFI)).
, a device that outputs digital data corresponding to a flash photography mode based on a charge completion signal of a main capacitor (not shown) in a flash light emitting device (PL) that is input through a terminal (JBs) on the camera body side, Its output is connected to the input terminal (IP6) of the data selector (MPI).

The interface circuit (!F) reads various data from the interchangeable lens (LE) when the output terminal (02) of μmcom (31) becomes lAH1gh/7, and reads various data from the interchangeable lens (LE). When the process is completed, the lens data read sequentially according to the 4-bit data from the output terminal (op3) of μmcom (]) is sent to the data selector (MPI) and the external data bus (DB) of μ-com (11). A specific circuit example of this interface circuit (IP) is shown in FIG. 7, and detailed operations will be described later.

The data selector (MPI) transfers data from the input terminals (IPI) to (IPs) to the data bus (DB) according to 4-bit data given from the output terminal (OF2) of μmcom (1) to the selection terminal (SL). μ-com (
Output to 11. The selection terminal (S) of this data selector (MPI) is given to the data and the data selector (M
Table 3 shows the relationship with the data output from the PI) to the data bus (DB).

Table 3 As can be seen from Table 3, if the data at the output terminal (OF2) is "OH", the set exposure time data Tvs from the input terminal (IF4) is II IHIf/(IP
The film sensitivity data 5v from s) is I' 2
u // If the exposure control mode data from (IPs) is %3.9, then the photometric value data from (IF2) is V'''4H // If the number of aperture steps is set from (IF3) Avs - Av The data of 'o' are respectively output to the data bus (DB) and taken in to μmcom(]). Also, the data of the output terminal (op3) is '5H'.
~'ACHII, data selector (MPI)
is input to the input terminal (IPI). Data from the interface circuit (IF) is output. Note that the interface circuit (IF) controls the lens (L) according to each data of "5H" to "X'CH" from the output terminal (OF2).
The data described below read from E) is sent to each terminal (IP
Output to I). Also, in μmcom(]l, when the lens attachment switch (LS) is closed and the input terminal (I4) is ``Low'', the data from the output terminal (op3) is from 'AOHII to kite 3H. data related to the lens (LE) is output as μmcom (11
is not loaded.

(FC) is a control device that controls the flashlight device (PL) from the camera body side, and sends a light emission start signal to the camera via the terminals (JBs) on the main body side and the terminal (IF2) on the flashlight device (PL) side. In addition to connecting the flashlight emitting device (FL) from the main body, you can also connect the terminal (JB7) on the main body side and the flashlight emitting device (F
A light emission stop signal is sent from the camera body to the flash light emitting device (PL) via the L) side terminal (IF3). The light emission start signal is sent, for example, when the shutter is fully opened, and the light emission stop signal is transmitted, for example, when the light from the subject illuminated by the flash light emitting device (FL) passes through the aperture of the lens and is reflected on the film surface. It is sent when the integral value reaches a predetermined value. With this configuration, when the charging voltage of the flashlight emitting device (F) of the main capacitor (not shown) reaches a predetermined value, a signal of "XXHigh" is output to the terminal (JFl),
A light emission start signal from the terminal (IF2) starts the light emission of the xenon tube (not shown), and a light emission stop signal from the terminal (IF3) causes the xenon tube to stop light emission.

The switch (R5) is a release switch that is closed in conjunction with the release operation, and the switch (CS) is an accidental exposure prevention switch that is closed when winding is completed and opened when the exposure control operation is completed. The signal from the release switch (R5) is input to one input terminal of the AND circuit (ANO) via the inverter (IN3), and the signal from the accidental exposure prevention switch (CS) is input via the inverter (IN4) to one input terminal of the AND circuit (ANO). Circuit (A
No.) is input to the other input terminal of μmc
It is input to the input terminal (12) of om(1). Further, the output terminal of the AND circuit (ANO) is connected to the interrupt terminal (1t) of μmcom (1). μ-com(1
) output terminal (Ol) is a terminal that becomes 1 old gh// when starting the exposure control operation, and this terminal is connected to the input terminal of the release circuit (Rrihakono-) figure
The output terminal (Ol) of μmcom (11) is connected to the input terminal of an inverter (IN2), and the output of this inverter (IN2) is connected to the input terminal of the inverter (IN2) via a resistor. is connected to the base of the power supply transistor (BTl), and even if the photometry switch (MS) is opened during exposure control operation, this transistor (
BTl) is maintained in a conductive state.

The output terminal (02) of μmcam (1) is a terminal that becomes 1 old ghl while the interface circuit (IF) is reading data from the lens (LE) side, and this terminal (0
2) is connected to the input terminal of the inverter (INK).

The output of this inverter (INS) is connected to the base of the power supply transistor (BTU) via a resistor.

Therefore, when the terminal (02) becomes %High, the output of the inverter (INS) becomes -Low #, the transistor (BT2) becomes conductive, and the voltage changes from the power supply line (+VB) to the power supply line (+VL).

Terminal on the camera body side (JBl), terminal on the lens side (J
Power is supplied to the circuit on the lens (LE) side via Lt).

L/7 Data output section on the lens (LE) side (ROM (Rot) in which various lens data is fixedly stored)
(described later) is built-in. The control pulse (CP) output from the interface circuit (IF) on the camera body side
L) is input to the data output section (power) via the terminal on the camera body side (JB2) and the terminal on the lens side (JL2).
Using this clock pulse (CPL) as a synchronization signal, the address signal and data signal of the ROM (ROI), the signal life (SB), and the terminal on the camera body side (JB3 ),
The signals are delivered alternately via the lens side terminal (JL3). The block (9) surrounded by a broken line is a variable data output unit that outputs data regarding the amount of movement from the reference position of the information output device, which will be described later, which outputs variable data on the lens side such as the distance to the subject. Inside, there is a distance information output device (DS) that outputs data on the amount of movement of a distance setting device (not shown) from the nearest shooting position to the shooting position, which is set corresponding to the distance from the subject to the subject, and a zoom lens. A focal length information output device (FS) is provided that outputs data on the amount of movement of a focal length setting device (not shown) from the position of the shortest focal length to the position of the set focal length. The data from the image information output device (DS) and (FS) is input to the data output section (power) and then stored in the ROM (
It becomes addressing data of ROM (ROI).
) outputs set distance data (absolute value) and set focal length data (absolute value).

1:'1., 1.1 Note that the distance information output device (DS) and the focal length information output device (ps) are constructed in the same way as the device that outputs data on the number of stops shown in FIG.

FIG. 6 is a flowchart showing the sequential operation of μmcom (1) in FIG. 1. Hereinafter, the data reading operation of the camera system of the embodiment shown in FIG. 1 will be explained based on the flowchart in FIG.

In step #], it is determined whether the photometry switch (MS) is closed and the input terminal (+1) becomes 'High'.If the photometry switch (MS) remains open, the input terminal (11) %Low', the process moves to step #2 and performs the operations of steps #3, #4, and #5, which will be described later.In step #1, the photometry switch (MS ) is closed and the input terminal (il) becomes "High//", the process moves to step #6 and the timer register (TR) is reset. This timer register (TR) will also be described later.

Next, in step #7, press the lens attachment switch ((LS)).
is closed and input leaks, child (i4) is uHHg), 7/
It is determined whether the Input terminal (14
) is Ill Low //, move to step #9 and change the 1-bit discrimination register (JP) to %li
g), // and move on to step #10.

On the other hand, if the input terminal (i4) is ゝゝHigh 〃
Move to step 8 and connect μmcom (output terminal 11 (
02) is set to 1 old gh", the transistor (Br3) is made conductive via the inverter (INS), and power is started to be supplied to the lens side circuit (power) (9), and the power is supplied from the lens in the interface circuit (IF). The data reading operation is started and the process moves to step #10.

Here, the detailed operation will be described later based on FIG. 7, but the lens side circuit is reset by the power-on reset signal caused by the start of power supply in conjunction with the 'High' terminal (02). ) data can be sent to the camera body.

As a result, the power supply terminal to the lens side and the terminal for transmitting the read operation start signal are shared, making it possible to reduce the number of terminals, suppressing increases in cost, and connecting the camera body and lens. The reliability and durability of the terminal can be improved.

In step #10, μ-com (11 output terminal (0
3) is set to "High", and then set to 'Low' in step #11. This causes the A-D converter (AD
) is given an A-D conversion start pulse to the photometry circuit (M
Start A-D conversion of the photometric output in E). Then, 4-bit data @ is stored in a data register (Dig) not shown.
Set OH# and output this data to the output terminal (OF2). Then, as shown in Table 3 above, the data selector (MPl) outputs the exposure time data Tvs from the input terminal (IF4), and this data is sent to the μ-com (inside 11) via the data bus (DB). Then, in step #15, 21" is added to the contents of the data register (DR), and in step #16, the contents of this data register (DR) are read as 'S4.
First, it is determined whether or not it has become u //, and ゝゝ4
If it is not u //, return to step #13 and repeat the same operation.

Therefore, the contents of the data register (DR) are SS 4H/
/ The data from the data selector (MPl) is read into μmcam (31).If the content of the data register (DR) is 11H, the film sensitivity data S
v is read, and if it is air axis, the exposure control mode data is read. Here, #10. A-D conversion is started by the pulse output from the terminal (03) in step #11, and when the content of the data register ((DR) reaches 13H〃 and the process moves to step #13, A-D conversion is started. - The time required for D conversion has passed, the A-D conversion has finished, and the input terminal of the data selector (MPt) (
IF2) is input with object brightness data By -Avo. Therefore, at '3H', this data is taken into a predetermined register.

Then, when the process moves to step #16, the content of the data register (DR) is 14H, so the process moves to step #17.

In step #17, the contents of the 1-bit register (JP) are determined, and if the mounting switch (LS) is not closed and is set to "1", the exposure calculation operation described below when there is no lens is performed. Move to step #18.
When it is determined that one piece is attached and the contents of the register (JF) are %o11, the process moves to step #2o and the data register (D
The content %4HI of R) is output to the output terminal (OF2).

As a result, the data selector (MPI) input terminal (I
Data of the number of refinement steps set for F3) Awe −A'
Outputs O to the data bus (DB).

Then, in step #21, this data Ays −Avo
μmcom (11 reads and takes it into a predetermined register.

Then, 11" is added to the contents of the data register (DR) and the process moves to step #23.

In step #23, μmcom(1) reads all lens data into the interface circuit (IF) and transfers it from the interface circuit (IF) to μmcom(1).
) is given to the input terminal (i3) of 1 old gh
Wait until it becomes /'. That is, after the output terminal (02) becomes *H1g h// in step #8, this #
Up to step 23, the interface circuit (I
F) to signal line (SB), terminal (JB2), (JL2
) via data output 4 (ROM (Rot) in 71
An address signal specifying the address of 1. is output in series.
Then fixed data based on the address is output from the data output section (7) to the terminal (JL2).

(JB2) and is sent serially to the interface circuit via the signal line (SB). When the fixed data transfer from the lens to the interface circuit (IF) is completed, the address of the ROM (ROI) is specified using the data from the information output device (DS) and (FS) on the lens side as an address signal. The set shooting distance information and the set focal length information are serially transferred from the lens to the interface circuit (IF) of the camera body. In this way, from the lens to the interface
When all the data transfer to (IF) is completed, the interface circuit (IF) sets the terminal connected to the input terminal (13) of μmcam (1) to 'High' and starts the lens data reading operation. On the other hand, the input terminal (13) of μ-cam (11) is set to XXH.
When it is determined that it has become Hghll, it moves to step #24 and sets the output terminal (02) to 1LOWl.
The power supply transistor (Br3) is made non-conductive to stop power supply from the power supply line (+VL) to the lens. Then, the interface circuit (I
Start reading data from F).

To summarize the above-mentioned data receiving and passing related to lens data reading, first, data specifying the address of the ROM (Rot) of the data output section (7) is sent from the camera body to the lens, and the data is stored at this specified address. The fixed data is sent from the lens to the main body repeatedly, and when the fixed data transfer operation is completed, the encoded setting information is output from the setting information output section (9) on the lens side. Data is R as is
Used as address data for OM (ROt),
The data stored at the specified address is sent to the camera body.

With such a configuration, the terminal for sending fixed data and the terminal for sending variable data (setting data) can be shared, and the number of terminals can be reduced. The setting information output unit (9) has a configuration similar to that shown in Fig. 4, and outputs coded data corresponding to the amount of relative movement from the reference position, and based on this data, it outputs coded data from the ROM (ROI). Since the set absolute value data is output, the number of bits is smaller than when the absolute value data is output directly from the code plate, and the area of the code plate can be reduced. Furthermore, address data is sent from the camera body to the lens via the signal line (SB), and then from the lens to the camera body.
) is configured to perform operations such as sending back data at different transfer timings, so addresses and data are transferred alternately in series, and only one terminal is required. The number of electrical contacts can be reduced.

When it is determined that the input terminal (!3) has become %H1ghll, μmcom (1) performs an operation to sequentially import the data taken into the interface circuit (IF) into μmcom (1) in step #25. . In this operation, 5H~--" data indicating which data is to be taken in from the output terminal (OPs) is sequentially output, and this specified data is given to the data selector (MPI) and the interface circuit (IF). The output terminal (OPs) data is 15H, 5H, 0.
7,3. ．． 11.6□・□11t1□7□ data AJ
O1'X7H" is the maximum aperture value data Avm.

jl BH〃, open aperture error data △Av o ,'
9 H', the shortest focal length data fw,' A)
I'', maximum focal length data ft, %BH#, set shooting distance data, and 11 CH//, set focal length data are output from the interface circuit (IF).

At this time, the data selector (MPA) outputs the input terminal (IP) to the data bus ΦB) (see Table 3), so μmcom (1) receives data from the data selector (MPI). data on the data bus (DB)
Repeat the process of importing from And μmco
All data from the interface circuit (IF) is taken into m(11), and when it is determined in step #28 that the contents of the data register (DR) have become %DH, the process moves to step #29.

The process in which lens data is transferred to μ-com (1) is mass, and each data is serially transferred to the interface circuit (IF).
Each data is latched into an interface circuit (IF) as parallel data. Next, μ-co
According to the data and data designation signals from m(11), each data is read in parallel in sequence into μ-cam(31).While the data is being read into the interface circuit (IF), μmcom(1) Other data is being read in. With this configuration, the overall operation is faster than when data is taken in using the data direct input terminal 11, in which data is input serially for each bit. It can save time.

#29 connects the lens to the interface circuit ((IP)
Among the data imported through the camera, it is determined whether check data, which is always input when a lens is attached, has been input. This check data is the first data sent from the lens, and is the same regardless of the lens. When it is determined that this check data has been input, μm
com(]) moves to step #30 and below, and if this check data is not input, moves to step #18. Cases in which this check data is not input include cases where a lens is not attached, and cases where a camera accessory such as an intermediate ring or bellows is attached between the lens and the camera body.

Based on the aforementioned data Av'o and △Avo read from the lens in step #30, Avo -1-Havo
= Avo −·+2+ is performed to calculate the open aperture value Avo of the lens. and#
Data By -Av A-D converted in step 31
Based on the data Avo calculated as o, (By −Avo) +Avo = By
...(Perform calculation 31 and move on to step #32.

In step #32, exposure calculation is performed according to the exposure control mode data read into μmcom (11).
The contents of exposure calculation in each mode will be explained below. Masu,
Calculations are performed in program mode, where both aperture value and exposure time are automatically and uniquely determined for exposure value Ev, and calculations are performed in aperture-priority automatic exposure time control mode, and exposure time-priority automatic aperture control mode is used. Calculations are performed in the control mode, and calculations are performed in the manual setting mode. In addition, the above program.

In each automatic exposure control mode of aperture priority and exposure time priority, if the calculated aperture value or exposure time is the control limit value, the exposure time or aperture value is conversely set based on the limit value. Re, order, 1 calculation 1 sea urchin.

ing.

In flash photography mode, the maximum light emitting point of the flash light emitting device (FL), the shooting distance to the subject set by the information output device (9) of the lens (LE), and the shutter mechanism (not shown) of the camera body Apex values corresponding to the flash synchronization limit exposure time determined by Iv, Dv, and Tvf, respectively.
Then, first, the calculation is performed, and the aperture value Avfl based on the exposure value Ev by TTL aperture average metering and the flash synchronization limit exposure time Tvf, and the aperture value Avf2 based on the maximum light emission amount and shooting distance are calculated. Calculated. Next, the sizes of these aperture values are compared and the Avfl
(If Avfz, Avf+ -Av.

If the refinement stage value is Avfl) Avfz, then A
vfz-Av.

The refinement stage value is calculated.

The aperture is controlled according to one of these refinement stage values, but the amount of light emitted by the flash light emitting device (F) is determined by the camera body's control device ( Here, the aperture value Avf1 is an aperture value that is narrowed down by αEv (for example, ]Ev) more than the appropriate aperture value determined by Ev and TVf.
Only the flash light emitting device (
By applying illumination light to the subject from the front end, the subject is exposed to appropriate light. In particular, when the brightness of the main subject is lower than the brightness of the sub-subject, as in so-called daytime synchronized photography, the exposure value Ev according to the average photometric value is close to the brightness of the sub-subject.

Control device (FC) for the luminance difference between the sub-objects and the above α
Accordingly, the amount of light emitted from the flash light emitting device (PL) is applied to the main subject, and the main subject is properly exposed. In addition, in the case of synchronized shooting during the daytime, the secondary subject is usually farther away than the main subject, and the amount of flash light is not given to the secondary subject sufficiently, but it is closer to ILE exposure, which is more or less suitable than αEv underexposure. This exposure is given to the sub-subject. Historically, when the aperture value becomes larger than Avfl or 8vf2 during daytime synchronized shooting, controlling the aperture with Avfl will cause the main subject to be underexposed due to insufficient light emitted from the flash device (F) to reach the main subject. So, Avfz
The aperture is controlled based on this to give the main subject proper exposure. In any case, the main subject is controlled to have proper exposure. Note that the value of α is not necessarily lEv and can be set as appropriate.

After performing the above calculation operations, μ-com (11 is 1-
Based on the calculation results described above, the exposure factor control value, exposure control mode, and warning display data are output to the display unit (DP) and #
Move to step 34.

On the other hand, if it is determined in step #29 that no check data has been input from the attached lens (LE), the process moves to step #18. The calculation operation in step #18 will be described in detail below.

Furthermore, as mentioned above, in step #17 the register (JF
) is 11 and it is determined that the lens (LE) 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. , when the effective aperture value at this time is Avn, the output of the photometry circuit (ME) is By -Avn. So (By −Avn) +Sv == Tv
. . -(9) is performed, and the exposure time is controlled using the calculated value. On the other hand, the value O is output as the number of stages of refinement, and no refinement 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 a zero value, and no narrowing down is performed. In the flash photography mode, the exposure time is controlled by the flash synchronization limit value Tvf, the number of stops outputs a value of O, and the amount of flash light emission is controlled by film metering and film sensitivity. And μmconi
(11 is step #19, and the exposure control value and exposure control setting are displayed on the display section (DP) at step i.
Display data such as codes and warnings are output, and the process moves to step #34. Note that at this time, information on the aperture value of the lens is not provided to the camera body, so it is impossible to display the aperture value, and the aperture value is not displayed.

In step #34, data for exposure time control is output from the output terminal (OPI) to the exposure time control device (CT),
In step #35, the data Av for controlling the number of narrowing stages
-A, v'o are sent to the aperture control device (CA) through the output terminal (op2). Then, in #36, the interrupt terminal (eye) is set to GH to enable transition to interrupt operation, and the contents of the register (JF) are set to ``0'' and the process returns to the start. Enabling migration means enabling the reception of an interrupt signal to the interrupt terminal (it).μmcom(
1) returns to the start, and when it is determined that the photometric switch (MS) is closed and the heka terminal (11) is "High", the above-mentioned operations #6 to #37 are repeated, This operation is repeated thereafter as long as the photometry switch (MS) is closed.

On the other hand, if the photometry switch (MS) is opened and the terminal (11) is set to ``Low'' when the operation of μ-com (11) returns to the start, the process moves to step #2.
It is determined whether the value of the timer register (TR) is larger than a certain value, and if it is smaller than K, the process moves to step #3, adds ] to the contents of this register (TR), and # Move to step 7, read the data mentioned above, display calculation 1, and then #1 → #2 →
Repeat the operations in the order of #3 → #7. and,#
If it is determined in step 2 whether the contents of the timer register (TR) have become larger than a certain value, the process moves to step #4 and the display section (DP) displays blank data with nothing displayed. is output, and in step #5, the reception of interrupt signals from the interrupt terminal (IT included) is stopped, and the process returns to step #l. After that, the photometry switch (MS
) is closed, repeating steps #2 → #4 → #5 → #1.

To summarize the operations of μmcom (11) above, while the photometric switch (MS) is closed, data is read,
The operation shown in calculation 1 is repeated, and even if the photometry switch is opened, the content of the timer register (TR) remains 0 for a certain period of time.
(from 1 to +1), the operations of data reading and calculation 2 display are repeated in the same way, and when the photometry switch (MS) is opened and a certain period of time has elapsed, the above-mentioned operations are no longer performed. Here, this certain period of time is, for example, about 15 seconds.

``When the photometric switch (MS) is closed and the first arithmetic operation is completed, it becomes possible to receive an interrupt signal to the interrupt terminal (it) in step #36.

Then, with the film winding completed and the accidental exposure prevention switch (CS) closed, press the release switch (
When R5) is closed, the output of the AND circuit (ANO) is N.
The signal becomes H1gh and an interrupt signal is input to the interrupt terminal (it). At this time, the calculation of the exposure factor control data has been completed and it is now possible to receive an interrupt signal, so the process moves to the flow for performing the exposure control operation from step #4o onwards. This transition is limited to μm as long as the exposure factor control data is calculated and interrupt operation is possible.
comfl) which step (however, 11, 2, 4.5
The flow is executed immediately even if the flow is being performed (excluded because it is a non-interruptable flow). Note that this transition is performed by immediately jumping to a specific address when μmcom(ll) receives an interrupt signal, and executing the instruction at that address.
In step 40, blank data is output to erase the display on the display (DP), and then in step 141, the terminal (DP) is output.
OL) to “H4gh” and release circuit (RL)
At the same time, even if the power supply transistor (BT+) is made conductive via the inverter (IN2) and the photometric switch (MS) is opened, the transistor (B
Self-maintains the conduction state of T+). Release circuit (RL
) operates, the exposure control mechanism (not shown) starts operating.

First, the aperture ring (13) starts the aperture operation, and the pulse generator (PG) outputs the number of pulses corresponding to the amount of rotation of the aperture ring (13). Data on the number of aperture stages A・-A・′・and-gate: When the aperture control device (CA) controls the aperture ring (1
The rotation of step 3) is stopped and the aperture aperture is determined. At this time, if the camera is, for example, a IIJ reflex camera having a focal plane shutter, a reflection mirror (not shown) is raised by 1 at the same time. Reflection mirror 1-
When the aperture is completed and the aperture aperture is determined, the front curtain (not shown)
At the same time, the exposure time control device (CT
) starts counting the exposure time based on data from the output terminal (OPI). In flash photography mode, the flash light emitting device (F-control device) is activated when the shutter is fully open.
A light emission start signal is output from the terminal (JBs) from the FC), and the flash light emitting device (F) receives this signal at the terminal (JF2) and starts emitting light, and the film surface photometry circuit (JBs) in the control device (FC) When the integral value of the terminal (shown) reaches a predetermined value,
JB7) outputs a light emission stop signal and activates the flash light emitting device (F
The device receives this signal from the terminal (JF3) and stops emitting light. Regardless of the flash photography mode or natural light photography mode, the cut value of the exposure time is output to the output terminal (O
When the value of the exposure time data from Pl) reaches the value, the exposure time control device (C") starts running the trailing curtain. Then,
When the trailing curtain completes travel, the accidental exposure prevention switch (CS)
The aperture is opened, the reflecting mirror is lowered, the diaphragm aperture becomes fully open, and the exposure operation is completed.

By completing the exposure control mechanism, accidental exposure can be prevented.
S) is open and the output of the inverter (IN4) connected to the input terminal (I2) becomes “Low”, #
At step 43, the output terminal (01) becomes 'Low', the release circuit (RL) becomes inactive, and
Self-holding of the power supply transistor (B'l) is released.

At step #44, it is determined that it is impossible to receive an interrupt signal to the interrupt terminal (it), and the process returns to the start. If the photometry switch (MS) continues to be closed at this time, data is read and calculated again.

When the display operation is performed and the photometry switch (MS) is closed, if the photometry switch (MS) is closed,
After reading and displaying calculation 2, μmcom (1)
is ready to accept interrupt signals, but since the release switch (R5) is closed and the accidental exposure protection switch (CS) is open, the AND circuit (ANO) is The output remains 'Low' and μmcom (1
), no interrupt signal is input to the interrupt terminal (it), and μmcomol will not perform the exposure control operation by mistake.

Note that even after the exposure control operation is completed, the film roll is still
When the spraying is not completed (when the accidental fogging prevention switch (CS) is
) When the photometry switch is opened, the data is read and calculated immediately.

The display operation may be stopped.

In this case, the input terminal (il) is set to IXH in step #1.
When it is determined that the input terminal (12) is not Hgh#, a snap is provided before step #2 to determine whether the input terminal (12) is ')Iigh, and it is determined that (12) is -oldgh//. If the %
If it is determined that it is LO, //, data of +1 may be set in the timer register (TR) and the process proceeds to step #2. At this time, (TR))K
Therefore, #4. Since the operation of step $5 is performed, the data reading and calculation 2 display operations are stopped immediately when the photometry switch (MS) is opened.

To summarize the operation of the μmcam(li) described in detail above, focusing on the interrupt signal, the photometry switch (MS) is closed, the data reading, calculation 2 display operation is completed once, and the data for exposure factor control is Once everything is in place, the interrupt signal can be accepted and the release switch (R5
) is closed, the exposure control operation based on the interrupt signal is started immediately. Further, even if the photometry switch (MS) is opened, the reading and calculation 7 display operations are repeated for a certain period of time, and interrupt signals are accepted during this time as well. When the photometry switch (MS) is opened and a certain period of time has elapsed, the reading, arithmetic and display operations are stopped, and no interrupt signals are accepted.

In addition, even if exposure control is completed, if winding is not completed, the reading and calculation 9 display will be performed in the same manner as described above, but the output of the AND circuit (ANo) will be output from the release switch (
R8X+ (closed and amo・n. ↓・remains 0.

No interrupt signal is input, and μmcom(ll) does not start the exposure control operation.

Since the system is as described above, μmcom (
When the data necessary for exposure control is not output from 31, even if the release switch (R5) is closed, the μmco
Since mll is in a state in which it does not accept interrupt signals, the exposure control operation is not started, and inappropriate exposure will not occur. Also, if the release switch (R8) is closed while the data necessary for exposure control is being output from μ-com (11), μ-com (1) will be immediately interrupted by an interrupt signal no matter what operation it is performing. Since the exposure control operation starts, you will never miss a photo opportunity.Furthermore, even if the release switch (R8) is closed before winding is complete, the μ-com
(Since no interrupt signal is input to 11, the μ-co
There is no malfunction such as m (lj starting an operation for exposure control.) As mentioned above, this system uses a mechanism based on □ in response to the interrupt signal of bar:... In connection with the start operation (release operation), μmc
We will explain the data fixedly stored in LOM (I (01) based on Table 4 and Table 5 for camera exposure control using om (11). As an example of a specific lens, the focal length is 50n ~ 135M and the aperture value is F
A zoom lens of 3.5 to F22 is shown. )tOM
(The address “00000001” of l(01) contains check data “111” to detect lens attachment.
00" is stored. Note that this data "1110" is stored in this address "00000001" for any type of lens, not limited to the lens mentioned in this specific example.
0'' is stored.The check data is 11.
It is not limited to 100'', but any data may be used as long as it is common to all types of lenses.

The address “00000010” stores the data of the aforementioned open aperture value Avo, but in this example, the open aperture value is F3.5 (Av = 3.61), so F3.4 (Av = Av = Data “00111” corresponding to 3.5) is stored. ”0000001
The data of the maximum aperture value Avm is stored in the address "1", and in this example, it is F22 (Av = 9), so the data "1" of F22 (Av = 9) shown in Table 5 is stored.
0010'' is stored.

The above-mentioned open aperture error ΔAvo data is stored in the address 00000100'', and in this example, the exact error is 0.11 Ev, so it is approximated to 1/8 and corresponds to ΔAvo = '/8 shown in Table 5. Data “00001”
Power (memorized. Note that the maximum aperture value is Q, 5 Ev
Table 6 shows the data of Av'o and ΔAvo of lenses that are not units. Also, the open aperture value is 0.5g.
In the case of a lens that is in v units, Av'o is of course the data of its maximum aperture value, and ΔAvo is zero data "ooooo".

At address "0OOOO10'l", data of the shortest focal length of the zoom lens /w is stored, and in this example, data "01011" corresponding to 50 cod shown in Table 5I is stored. Note that in the case of a fixed focal length lens whose focal length is not variable, data on the focal length of the lens is stored at this address. ”00000
The address "110" stores the data of the longest focal length of the zoom lens /1, and in this example, the data "10001" corresponding to 135M shown in 5 is stored. In the case of a focal length lens, the data “11111” indicates that it is a fixed focal length lens.
'' is stored. This is the data of L or the fixed data of the lens.

Address “00010000” to “00011111”
Data on the shooting distance as variable data is stored in the range ``.The shooting distance information output device (DS) records the amount of movement of the distance ring (not shown) from the infinite position.
-1 The corresponding 4-bit data is output, and this data specifies the address of the lower 4 bits of r3 to rO of the address data, and the shooting distance (absolute value) data stored in the corresponding address is Output. In this example, when data "0010" is output from the block (DS), data "0110" of 2m (Dv=2) stored in the specified address "00010010" is output, and data "0110" of 1011" is output. When data is output, address “00011011” is specified and 9.5m (Dv =
6.5) (7) Data “10101” is output.

Note that since the shooting distance data is used for calculations for flash photography, it is in the same apex series as the aperture value, and Dv
Data corresponding to the value of rm is displayed when rm changes in units of 0.5, but the block (DS)
Increase the number of bits of data for the address from R
By increasing the number of bits of data in OM(l(0+)), it is possible to increase the range of data in units of fineness.

Address number “00100009” to “00101111”
In the case of a zoom lens, data on the focal length set is stored in ``, and in the case of a fixed focus lens, data such as ``11111'' indicating that it is a fixed focus lens is stored in all of these addresses. Then, in the same way as the shooting distance, the focal length information output device (FS) outputs 4-bit data corresponding to the amount of movement of the zoom ring (not shown) of the zoom lens from the position of the shortest focal length. The address of the lower 4 bits of r3 to ro in the data is specified, and the data of the focal length (absolute value) stored there is output.In this example, the data from the block (FS) is The data is “001”
0”, address “00100010” is specified and 50M data “01011” is output, and '10
If "10" is output, the address "00101010" is specified and 105M data "10000" is output. Note that the focal length is 5Q ts.
, 85 m, 1001111, etc., that is, only the focal length of a fixed focal length lens can be obtained, but by increasing the number of bits of address data and focal length data, more detailed focal length data can be obtained. It is also possible to obtain

Next, in the interface circuit of FIG. 7, from the terminal (02) of p-com (1) to "f(
When the data reading start signal of ``high°'' is output (Fig. 9, 02.), the one-shot circuit (
A “High” pulse is output from O8+) (9th
As shown in the figure, seven lip-flops (PFl) are set at the falling edge of this pulse. This flip-flop (FF) is a pulse (Pi(2)) from the power-on reset circuit (PO2) (Fig. 1) output from the OR circuit (01(,t)) or the AND circuit (ANI7
) is reset at the falling edge of the t pulse (end2), which indicates the end of reading data from the interface circuit (IP). The Q output of the flip-flop (FFl) is connected to one input terminal of the NAND circuit (ANt) and the D input terminal of the D flip-flop (DF), and
The oscillator (O20) shown in Figure 1 is connected to the other input terminal of Nl).
The clock pulse output terminal (CP) of the AND circuit (ANI) is connected, and the output terminal (CPL) of the AND circuit (ANI) is connected to the clock terminal (CL) of the D flip flip (13Ft) and the terminal (
JB2) and the terminal on the lens side (JL2)
Intermediate lens (LE) to black pulse (CPL)
supplying. Therefore, D flip-flop 7p (1
)F takes in the D input at the falling edge of the next clock pulse (CPL) after the flip-flop (FF1) is set, and makes the Q output “High” (9th
Figure DPI). And this D flip-70 tube (1) F
Q output of l) is counter (CO1), (CO2)
, (COs) reset terminal, decoder (L) B2)
, is connected to the enable terminal of (DEa),
When the Q output becomes “Higb”, the counter (LY)
), (CO+), and (CO3) are released from the reset state, and the decoder (13E2).

(1) B3) becomes ready for output, and data can be exchanged between this interface circuit (IP) and the lens side. In addition, the output terminal of the OR circuit (ORI) is a flip-flop (FF3) and a D-flip fist 7.
It is also connected to the reset terminal of 0tub (DFt).
The flip-flop (FF3) is an OR circuit (set at the rising edge of the pulse from the OR circuit: ・S・, D)
:l・kaku1 The lip e-flop (L)'1) is reset at the rising edge of the pulse.

On the other hand, in FIG. 8, as mentioned above, μmco of FIG.
When the terminal (0) of mtll becomes “High”, the transistor (BTU) becomes conductive and the terminals (JBI) and (J
Power supply from the camera body side to the lens side is started via Lt). This allows the power-on reset circuit (PO
3) operates, and the flip-flop (FFy) whose reset terminal is connected to the output terminal of this circuit (POs)
), the D flip-flop (DFb) is reset at the rising edge of this pulse, and the flip-flops (FFs) to which the set terminal is connected are set at the falling edge. And the AND circuit (ANt) in Figure 7
The Q output (“High”) of the flip-flop (FFs) is taken into the D flip-flop (DFs) at the falling edge of the clock pulse (CPL) input from the The Q output of the D flip-flop (DFs) becomes "High".

This Q output terminal is connected to the reset terminal of the counter (■'), (Gos) and the enable terminal X of the counter (CO4), (cos).
) is released from the reset state, and the decoder (DE4) becomes ready for output. Here, the one-shot circuit (O8
During the “High” pulse output from the power-on reset circuit (PO3), the “High” pulse output from the power-on reset circuit (PO3)
If you make the pulse longer than the duration of the flip pulse shown in Figure 8,
After the flops (FFs) are set, the flip-flop (FFI) of FIG.
Since a clock pulse is output from the AND circuit (ANl) by setting the Il flop (FF I ), the first clock pulse (CP
D flip-flops (DFs) are reliably activated at the falling edge of L).
).

The Q output of (DFS) becomes "High", and the reset state of the camera body side and lens side circuits is released at the same time.

Counter (COt) and decoder (1) B2 in Figure 7
), the counter (L'04) and decoder (the gaps in Figure 8 are circuits that output timing signals for synchronizing the camera body side and the lens side, respectively, and the counter ((Il)
Decoder (oE2) is a 4-bit hexadecimal counter that counts clock pulses (CP) and a counter (CO and l) respectively count clock pulses (CP).

(DE4) is the counter (Cot), the lower 3 bits of (CO4) (CB2), (CBI), (C1
3o) , (CL2) , (CLt) , (C
LO) is input, and the data of the lower 3 bits and output terminals (TB7) to (TBo),
Set one of (TL?) to (TLo) to 'High'.The appearance force S of this output TBo (T
Table 7 shows the relationship between the inputs and outputs of the decoders (DEz) and (DE4). In addition, from now on, it is a terminal (1'BO).

(TLo) Ka"l-1-1i" +C null time 7'f
'x (Tt30).

(TLO) timing, (TBI), ('rI,
The timing when t) becomes “High” is determined by ('I'f3t
), (TLI) timing.

In FIG. 7, the terminal (TBS) of the decoder (L) E2) is connected to one input of the AND circuit (AN?),
A terminal (C84) of a counter (Cot) is connected to the other input via an inverter (INO). The output of the AND circuit (AN7) is connected to the clock input terminal (CL) of the counter (CO3). This counter (CO3) is stored in the ROM on the lens side (i(01) (
This is a 3-bit counter used to specify address data (Fig. 8), and the output of these 3 bits is the input terminal (Ba3) of the shift register (SRI), (
Baz).

(Ba 1 ). This counter (Co
3) The output terminal (C84) of the counter (COl) is “
When the output terminal (T
Since it is a counter that counts the pulses output from (BS), “
001'', '010' at the timing of (TBS) in step (82), 'on' at the timing of (TBS) in step (S4), '100' at the timing of (11B) in step (86), (Ss ) step of (”], “B
It becomes "101" at the timing of s), and becomes "110" at the timing of (TBS) of step (810).

The shift register (84(t) in FIG. 7 is an 8-bit manual shift register, and the terminals (Ba3.), (Ba2), to which the output of the counter ((X)3) is connected
Input terminals other than (Bad) (Bat) ~ (Hat)
, (Baa) are connected to ground and "0" is always input. When the input to the switching terminal (SP) is "High", this shift register (81(1) data is taken in, and the input to the switching terminal (sp) is “Low”.
When , the data captured at the rising edge of the clock pulse to the clock terminal is serially output from the L-order bit to the output terminal (
Output to OUT).

The clock pulse (CP) terminal is commonly connected to one input terminal of the AND circuits (AN2) and (AN s ), and the output terminal (DEz) of the decoder (DEz) is connected to the other input terminal of the AND circuit (AN2). TBS) is connected to the input terminal of the AND circuit (AN3), and the output terminal r (TB7) of the decoder CDE2) is connected to the input terminal of the AND circuit (AN3). The output of the AND circuit (AN2) is connected to the set terminal of the flip-flop (FF2), and the output of the AND circuit (AN3) is connected to the reset terminal T of the flip-flop (I/F). - The Q output of the flop (FF2) is connected to the switching terminal (SP) of the shift register (S). Therefore, the flip-flop (FF2) outputs the clock pulse (TBs) at the timing of (TBs).
cp) is set at the falling edge of clock pulse (CP), and is reset at the falling edge of the clock pulse (CP) output at the timing of (TB). is a decoder (DE2)
Data is input in parallel at the rising edge of the output terminal (TB?), and data is output in series at timings from (TBO) to (TB6).

The output (end) of an AND circuit (AN 15 ) is connected to the set terminal of the flip flop (FF3) in FIG. 7. One input terminal of this AND circuit (AN t s ) is connected to a decoder ( DE output terminal (TB6
) is connected, and the output terminal (S 12 ) of the 1:'7': coder (DE3) is connected to the other input terminal. Therefore, the timing (T
BS), a pulse of (endx) is output. As will be described later, this timing is the timing at which reading of the fixed data of the lens is completed, and henceforth there is no need to output address data from the interface circuit (IF) of the camera body. Therefore, this (ends) pulse sets the flip fist 70 knobs (FFs) to make the Q output "Low", and this Q output changes the output of the AND circuit (ANA) connected to one input terminal to ""Low" to make the switch circuit (SC) non-conductive.The other input terminal of this AND circuit (AN4) is connected to a counter (
Cot) terminal (CBa) is connected, and after the flip 7o tuff (FF3) is reset by the pulse from the OR circuit (Oftt), the above AND circuit (ANts) is connected.
The switch circuit (8Ct) is conductive until it is set by the pulse (endx) from
The address data from (,1) is transferred from the terminal (JBa) to (
The signal is sent to the lens side circuit via JL3).

One input terminal of the OR circuit (O
(IN6) Intermediate counter (COl) terminal (CB
S) is connected, and the other input terminal has the aforementioned flip
The Q output of the flop (FF3) is connected. The output of the OR circuit (01 (, 3) is connected to the control terminal f of the switch circuit (SC2) and one input terminal of the AND circuit (ANS).The other input terminal of the AND circuit (ANs) is Decoder (DE2) output terminal (THs
) are connected, and the output terminal of the AND circuit (ANs) is connected to the latch terminal ([j) of the latch circuit (LA). The switch circuit (SC2) is connected between the terminal (JB) and the input terminal (IN) of the shift register (SR), and this shift register (12) is connected to the clock terminal (CL).
) is input to the input terminal (CIN) in synchronization with the falling edge of the clock pulse (CP) input to the terminal (B).
bo) to (Bb4) in sequence. Note that the output of the OR circuit (0143) is a flip-flop (FF
s) is in the reset state (i.e., from the start of reading data from the lens until the reading of fixed data is completed) and the output terminal (CBS) of the counter (COl) is "Low" becomes "High", the switch circuit (SCz) is made conductive, and lens data is taken into the shift register (SR2).

In other words, the switch circuits (8C1) and (SC2) are made conductive alternately and never at the same time, and by doing this, the signal line (SB) is connected to the switch circuit (8C1) and (SC2).
While SC is conductive, the address data is connected to the terminal (JB
3) The data is sent from the shift register (8Rx) on the main body side to the lens side circuit via JL, and while the switch circuit (SC) is conductive, the lens data is sent to the terminal (
JL3), (JB3) [7] and is sent from the lens side to the shift register (81(,2)) on the camera body side.

The output terminal (Bb4) of this shift register (SR2) ~
(BbO) is connected to the input terminal of the latch circuit (LA), and the timing (TBs) when the output of the latch circuit (LA month or OR circuit (01(3)) is “High”
At the rising edge of , the output of the shift register (81(,2)) is latched.

The output of the latch circuit (LA) is the register ()tEGo)
The outputs of the AND circuits (ANs o ) to (ANt) are connected to these registers (source o) to (of the latch terminal of R1 (Gy)), respectively. This AND circuit (AN lo
) to (ANI7) are commonly connected to the output terminal (TBS) of the decoder (DEN), and the other input terminal of the AND circuit (ANlo) to (ANI) is connected to the decoder (1) E3. ) output terminals (82), (84)
, (86), (8g), (81G), (81su, (81
3) and (814) are connected to each other. Also, the output of the AND circuit (AN t t) is the terminal (endz) indicating that all data reading of the lens has been completed.
This terminal (end x) is connected to the set terminal of the flip-flop (FF4). The Q output of this flip-flop (FF4) is p in Figure 1.
-com (11 input terminal (i3). The output terminal of the OR circuit (ON'tZ) is connected to the reset terminal of this flip-flop (FFi), and one input terminal of this OR circuit is connected to the reset terminal of this flip-flop (FFi). The output terminal (PR2) of the power-on reset circuit CPOz in Fig. 1 is connected to the terminal, and the output terminal (a7) of the decoder (DE) described later is connected to the other input terminal.・
111, :11 The flop (FF4) is connected to the output terminal (P) of the power-on reset circuit (POz) when the photometry switch (MS) is closed.
When a pulse is output from L2), it is reset, and all data from the lens has been read, and the AND circuit (AN is set by a pulse output from the output terminal (end). Then, the decoder (DEI) terminal (a
7), as described later, is an interface circuit (I
The flip-flop (FF4) connects the interface circuit (IP) to
It is reset at the end of outputting data to om(1).

The output terminal (OF3) of p-com (1) is input to the decoder (L) and E, and depending on the data from this output terminal (OF), one of the output terminals Cab to (a) is input. One is 'i-1i g h.' Table 9 shows the relationship between the input and output of this decoder (1) El).

(Left below) :) □ Table 9 Output terminals (ao) to (a7) of decoder (1) El)
is connected to each chip select terminal (CS) of registers (1 (Jlo) to (RhCGy)), and the register whose chip select terminal (C8) is "H4gh" is taken into that (1). .

In FIG. 8, one input terminal of the AND circuit (AN30) is connected to the output terminal (CLa) of the counter (CO4), and the other input terminal is connected to the flip
t) is connected to the Q output (F D ) di, and the output of this AND circuit (AN3o) is connected to the control terminal of the switch circuit (SC3). And this switch circuit (
SC3) is connected to the terminal (JL3) and the shift register (SR,3
) input terminal. Furthermore, the clock pulse (CPL) from the C terminal (JL2) is input to the clock input terminal (CL) of the shift register (SR3), and the switch circuit (8C3) of this shift register (8Rs) is conductive. In the meantime, address data input from the camera body side via terminals (JB3) and (JL) is sequentially sent to terminals (Lao) to (La6) in synchronization with the falling edge of the clock pulse (CPL).

The AND circuit (AN a t ) includes a shift register (S
) t3 ) lower 3 bits output (Lag), (Lax
), (Lao) are input, and these outputs are “1”.
10'', the output of the AND circuit (AN a l) becomes ``High''.The timing of this ``High'' is at the time when the final address data for fixed data is sent from the camera body. Corresponds to the AND circuit (A
This AND circuit (AN!1) is connected to one input of Nss).
output is connected, and the other input receives a clock pulse (C
PL) is input, and this output is a flip-flop (F
F7) is connected to the set terminal. Therefore, this flip flop (FF7) has a timing ('I”C7
), when it is determined that the output of the AND circuit (AN31) is "High" (that is, it is the final atlas for fixed data), the Q output (F f')) changes to " The Q output (F'J) becomes "High" and the Q output (F'J) becomes "Low". One input terminal of the AND circuit (AN32) is the Q output (F I') of the flip-flop (FF7).
) is connected, and on the other hand, :'s, :::1 input terminal is connected to
- The output terminal (TL6) of the gate (DE4) is connected, and the output terminal of the AND4 (AN32) is connected to the counter (Cps
) is connected to the clock input terminal ((:'1.). Therefore, the output (Cat) of the counter (c, 'O8)
l CCa0) is the Q of the flip-flop (FFy)
When the output (FD) becomes “High”, the next step (8
1g) at the timing (TL6), '1' at the next step (S s s ) timing (TL6)
0”.

The outputs (Ca1) and (Cao) of the counter (■5) are connected to the selection terminal (SL) of the data selector (MP) and the data input sections (C2) and (C3).The data of the data selector (MP2) The outputs (La6) to (Lao) of the shift register (S) (C3) are connected to the input section (C1).

The most significant bit of the data input section (C2) is grounded, and the second and third bits from the most significant are connected to the counter ((X)s
, ) 0) The outputs (Cai) and (Cao) are the lower 4
The bits ζ are respectively connected to the output of a shooting distance information output device (DS). The most significant bit of the data input section (C3) is grounded, and the second and third bits from the most significant bit are connected to the output terminal -F (C
at).

(C2o,), the output of the focal length information output device (FS) is connected to the lower four bits. From this data selector (MP2), a selection terminal (SJ, )-
If the data of \ is "00", the data from the data input section (αl) is output, if it is "01", the data from the data input section (C2) is output, and if it is "10", the data is output from the data input section (αl). Data from (C3) is output.

Therefore, at the timing O of (TLs) in step (812), the address data sent from the camera body via shift register (SR3) via L5 is output from this data selector (MP 2 ), and the address data sent from the camera body via shift register (SR3) is output. Step (S t 3) from the timing of ('IT, 6)
) until the timing of ('rr, a), the address data for the shooting distance is output from the data input section (C2), and after the timing of (TL6) of step (Sr 3), the address data is output from the data input section (C3). Address data for the focal length of is output.

The output terminal of the data selector (MP2) is ilJM
The lower 7 bits of the address terminals (C7) to (rO) of the address terminals (C6) to (rO) are connected, and the highest 1st bit (C7) of the address terminals is connected to ground. has been done. As explained in Table 4 above, this ROM (i) has predetermined address numbers fixedly stored therein, and the AT1/S terminal (+7
) to (rO) (ζ specifies the at
Also, whether the data fixedly stored at the address or the output terminal
2 outputs. The output terminal of this It OM (ROI) is connected to the input terminals (Lby) to (
Lb3), and the remaining input terminals (IJb2), (Lbl), (Lb
o) is connected to ground. This shift register (
SR4), AND circuit (AN33).

(AN34), the flip-flop (FFa) is the shift register (S) (+) on the camera body side in Fig. 7 mentioned above.
, AND circuit (AN2), (AN3), has the same configuration as the flip 70 tube (FF2), and the input terminal (Lb7) is connected at the rising edge of the timing (TL7).
It takes in the data from ~(Lb,) and outputs the data serially to the output terminal (0[JT) starting from the most significant bits at the subsequent rising and falling timings.

One input terminal of the OR circuit (tl-C5) is the counter (CO4), and the output terminal (cr, a) is the inverter (■
1. The Q output (FD) of the flip-flop ( )'F7) is connected to the other input terminal, and the output terminal is connected to the control terminal of the switch (SC4). The switch circuit (SC'4a) connects the output terminal (OUT) of the shift register (8) and the terminal (J
L3). This OR circuit (01(
, 5), a switch circuit (SC4), and an AND circuit, (
Depending on the configuration of AN 30) and switch circuit (SC),
Q output (FD) of flip-flop (F'F 7 )
The switch circuit (S
Cs) is conductive and the terminal (JB3.) is connected from the camera body side.
, (JL3) is read into the shift register, and the output terminal (CL3) is “
During the period of 'Jr 01w・'', the switch circuit (SC4) becomes conductive and the data from l(, OM(i(01)
JL3) and (Ji33) to the camera body. In other words, the address data and the fixed data from ROM (I (01)) will be input and output in one cycle.
7, the Q output (F l
)) becomes “High h”, switch circuit C3C
4) remains conductive, and f(,OM,(IMJ
! ) is sent to the camera body via terminals (JLs) and (JB3).

Based on the time charts in Figures 9 and 10,
The operation of the circuits shown in FIG. 8 and FIG. 8 will be explained. First, p in Figure 1
-com (1) output terminal (02) is “I-l-1i
” (Fig. 9 02), the one-shot circuit (O8l
), the flip-flop (FFI) is set, and on the rising edge of the next clock pulse, the D flip-flop (DF 1) is set.
The Q output of the counter becomes “High” and the counter (Cot
).

The reset states of (CO2) and (coa) are released, and the decoders (DEz) and (DF3) become ready for output. Furthermore, by setting the flip-flop (FFI), a clock pulse (CI'L) is output from the AND circuit (AND) (CPL in Figure 9), and this clock pulse (CP, L) is sent to the terminal (J! 3su, (JL2
) is stolen by the circuit shown in Figure 8 on the lens side. on the other hand,
When the output terminal (02) of μm-con (1) in Fig. 1 becomes “High”, the power supply transistor (BT2) in Fig. 1 becomes conductive (7 terminal (JB+), , * (J
Power is started to be supplied to the circuit of No. 8 A via LI). When power supply from the terminal (JLI) starts, a pulse is output from the power-on reset circuit (PO2) and the flip-flop (FFy) and D flip-flop (DFS) are output.
is reset at this rising edge, and the flip-flop (FF5) is set at this falling edge. Then, at the first falling edge of the clock pulse (CPL), the Q output of the D flip-flop (DFs) becomes "High" and the counter (CO4) is activated.

(CO5) is released from the reset state, and the decoder (DF
4) becomes ready for output. This completes the preparation for starting the data output operation.

Next, in FIG. 7, (TB 6 of the (So) step
), the counter (COs) becomes "001", and this data is taken into the shift register (81-(,+)) at the timing of (TB7).
81) At the rising timing of steps (TBO) to (TB7), shift register (81(,l) Noah'
-9"00000010" It is output in series from the Cal1i primary switch circuit (SC+) via the terminals (Jl13) and CJL3). On the other hand, in FIG. 8, the switch circuit (SC3) is conductive at this time, so the above-mentioned data is taken into the shift register (sl(a)) at the falling timing of the clock pulse (CPL). Go (Fig. 9 081, La r, La2
).

The data from this shift register (Sf(,a) is transferred to the ROM(l(01)) via the data selector (MP2).
is sent to the address terminals (re) ~ (ro) of ($9
Figure SB, Lao.

1', a' + L a 2), data at the specified address is output from aOM (ROI). Output (Laa) ~ (L) of the shift register (8143) in Figure 8
ao), the output is '00000' at the falling edge of the clock pulse at the timing (TLs) of the (sl) step.
01'' and fA') (Fig. 9 Lao.

Lad, La2), ROM (1 (01) Lt“0
0000001" address is specified. This address contains check data "0000001" as shown in Table 4 above.
11100"" is stored, and this data is stored in the ROM.
oto+) is output. This output is ('IT, 7)
Shift register (SR4) at the rising edge of the timing of
be taken in. Next (S2) step timing (
At TI, o) ~ (TL7), the output terminal (CL3) of the counter (CO4) becomes “Low” and the timing (T
At the rising edge of Lo) to (TL7), the shift register (S
The data output from the output terminals (Lb, ) to (Lb O) of R4) is sequentially output from the sui-nochi circuit (SC4) to the terminal (
It is sent in series to the camera body via JLa) and (JB3) (SB in Figure 9).

In Figure 7, data is sent from the lens (S
2) In step, the output (CBS
) is “Low” and the Sui Nochi circuit (Se2)
is conducting. Therefore, the terminals (JLs), (JB
The check data “1110” input via
0"(@"9 Figure 8B) is taken into the shift register (SR2) via the switch circuit (SC2) at the falling edge of the clock pulse (CP) (Figure 9 BbO).
~Bb4). Then, at the falling edge of the clock pulse (cp) at timing (TB4), this shift register (S
The output of R becomes “11100” (Fig. 9 BbO-B
b4 ), (TBS) timing, AND circuit (AN
s) of the pulse output from (Fig. 9 ANs)
: 'Rise', data from the shift register (SL(2)) is latched into the latch circuit (LA) at the rising edge.
Then, at the timing of (TB6), the AND circuit (AN 10
) The data from the latch circuit (LA) is taken into the register (RE(io + ) at the rising edge of the pulse from the register (AN t o in FIG. 9).

(S2) By outputting a pulse from the AND circuit (AN7) at the timing (TBa) of the step, the counter (COs) becomes "010", and at the timing (TB), the shift register (SR, 1) is set to "000001".
00'' data is taken in. Then, at step (S3), the counter (CO output terminal ((, 'B3
) becomes "High", the switch circuit (8C becomes conductive [7], and the output terminal of the counter (cO in Fig. 8) becomes "High".
Cl3) becomes “High” and the switch circuit (8C
a) conducts. As a result, the address data from the shift register (S)Ll) is taken into the shift register (SR3) in FIG. ) to (rO). And (TLy
) data of the open aperture value Av6 stored in the address "00000010" of the ROM (HOt) is taken into the shift register (St(4)).Here, the data of the above Av6 is as shown in the example of Table 4. In this case, the data is "00111" corresponding to F 3.4 (Avd=3.5).

At step (S4), the counter (coi) terminal (C84), the counter (CO4) terminal (Cl3)
becomes “Low” and the switch circuit (8C2), (
8C4) becomes conductive, the data 00111'' from the shift register (81-L4) is transferred to the shift register (8kL2) in the same manner as described above, and the latch circuit (LA) is transferred at the timing of (1'Bs). The data is latched and the AND circuit (ANtt) is activated at the timing of (TBS).
The pulse from (ANtt in Figure 9) register (RJ]G
t), the data of the open aperture value Avo is taken in.

Similarly, in step (S5), “000001
10" address data is sent to the lens, and in step (86) the data of the maximum aperture value Avm is sent to the camera body side and is taken into the register (BEG2) at the timing of (TB6). In step (S7), the data of the maximum aperture value Avm is sent to the camera body side.
Address data of 0'' is sent to the lens, and in the (8s) step, data of the open aperture error ΔAvo is sent to the main body side, and at the timing of (TB6), the register (BEG3) (
This is taken in. (S9) At step “000010
10” address data is sent to the lens, (St
In step o), the data of the shortest focal length /w is sent to the main body side, and at the timing (T'f3a), it is stored in the register (BEG).
4). (811) Step “0”
Address data of "0001100" is sent to the lens, and in step (812), data of longest focal length/1 is sent to the main body side and taken into the register (BEG5) at the timing of (TB6). Loading of fixed data is completed.

In step (811), timing (TB6)
At the falling edge of the clock pulse (CPL), the outputs (La2) and (Lat
), (Lao) becomes “110” (Fig. 10 Lao,
La1. La2), the clock pulse (C) output from the AND circuit (AN a s ) at the timing (TL?)
At the rising edge of PL), the 7th lip-flop (FF7) is set and the terminal (F'l)) becomes "High" + (F
D) becomes “Low”. This allows the counter (
■Regardless of the output state of the output terminal (Cl3) in 4),
The output of the AND circuit (ANao) is “Low”.

The output of the OR circuit (Of(5) becomes "High", the switch circuit (SC3) becomes non-conductive, the Sui-Sochi circuit (SC4) becomes conductive, and from then on, the data from the lens is only sent to the main body. state.

In the step (812), the data of the maximum focal length is transferred, and at the same time that the above data is taken in to the register (REos) by the pulse at the timing of (TBS) from the AND circuit (jVhs), the AND circuit Circuit (AN
7 lip-flops (FF 3 ) are set by the Noculus from the output terminal (endt) of
) The output of the AND circuit (ANA) is 'Low' regardless of the output state of the output terminal (C84), and the OR circuit (ORB)
The output becomes “High” and the switch circuit (SC1)
The switch circuit (SC2) becomes conductive. Therefore, from now on, all you have to do is import data from the lens.

At the timing of (TL6) in step (812), the counter (c'os) inputs the /clueless from the AND circuit (AN32), runs 1:1:'1, and the output becomes "0 bit" (the Figure 10 Cao.

Ca1). As a result, the data selector (MP2) outputs the data from the data input section (C2) [7, and this data specifies the address of the ROM ()10.

Furthermore, the upper 4 bits of this data are the counter (■5)
"0001" corresponding to the output of If is “ooootooo”, it is 1.4m
The data “01010” indicating “0001000
1” indicates 1.7m, and 00011110 indicates 16m.
If the data of ``0'' is ``00011111'', data of ``11111'' indicating ■ is stored.

This shooting distance data (Dv) 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).
1s) At the falling edge of the clock pulse (CP) at step timing (TBO) ~ (TB4), it is taken into the shift register (S) t2) in Figure 7 (BbO ~ in Figure 10).
Bb4), (TBS) timing and latch circuit (L
A) Latch , ′.

and the AND circuit (ANia) is activated at the timing of (TBa).
) output pulse (Figure 10 AN s 6) register (
The shooting distance data is imported into Moe α).

At the timing (TLs) of the step (314), the counter (■5) outputs "10" due to the pulse from the AND circuit (Cao, Ca1 in Figure 10), and the output from the data selector (MP2) is Data input section (C3)
The data from is output. This allows ROM ()
The upper 4 bits of the address [)t) are "ooto", and the lower 4 bits are data from the focal length information output device (FS). As shown in Table 4, this address stores point distance data, and in the example of Table 4, if the address is "00100000", it is 150JII.
The data "01011" indicating I is '00101010
”, data “10000” indicating f105M, and data “10001” indicating 7135 m, if “00101111” are output from the focal length data (/S ) is taken into the shift register (SR) at the timing ('rL 7 ) of the step of (Sl) in the same manner as described above, and (Sl
The data is taken into the latch circuit (LA) at the timing of (TBs) in step 4), and this data is taken into the register (REG7) at the timing of (TBs). At this time, the output (endz) of the AND circuit (AN17) sets the flip-flop (FF4) [7 (Fig. 10A
Nxt,endz,FFa),p-(om(1)
(7) Send the “Higls” signal to the input terminal (i3). p-com (1) is the input terminal (
It is determined that the reading of lens data is completed when the input signal becomes “High”, and the output terminal (02) is set to “L”.
ow" and stop the power supply to the lens side at 17. This completes the interface circuit (IF) from the lens to the camera body side.
) ends.

Next, p-com (1) is an interface circuit (I
P ) to μmcom (
1) Start loading data into. First, μ-co
m (data from output terminal (OPa) of 11 is “5H”)
Then, the output terminal (ao) of the decoder (DEl) becomes “Hi”
gh'', the check data from the register (REGo) is output to the data bus (1)B)in via the data selector (MP t ), and this check data is
com(1). Next, when the data of (op a) becomes "6H", the terminal (a+) becomes "High" and the data of the register (RE()l) is read into μmcom(1) via the data bus (DB). . Similarly, registers (i'tEG a) to (Rg
The data from G7) is sequentially read into μmcom (1) via the data bus (DB), and when the reading is completed, the data is transferred to μmcom (1) according to the flowchart in FIG.
(11 moves on to the next operation.

The overall embodiment of the camera to which this invention is applied, which has been described in detail above, can be modified as follows. First, most of the control operations of the aperture and kiln exit time control sections can be performed by μmcom (11), which reduces the number of external circuit components.Also, the interface circuit from the lens to the camera body side When reading data serially into (IF), if you read the data that has already been read in parallel into μmcom (1), it will add more μm.
The time to read data to com(1) can be shortened.

In addition, in the flowchart of FIG. 6 of this embodiment, μ
mcom(1) starts to operate constantly,・□
・)□ However, running μ-com (11) all the time consumes a lot of power, and the power battery (BA) quickly runs out [7
Therefore, adjust the μmc according to the functions of the μmcom you are using.
The program may be predetermined so that om does not operate when it is not required to do so. Since this can be easily realized by a person skilled in the art, a specific example of μmcom will be given, and a flowchart (program) suitable for the μmcom will not be shown.

Furthermore, in the above-described embodiments, an interchangeable lens is given as an example of a camera accessory, but the present invention is not limited to data exchange between an interchangeable lens and a camera body; Other strobes, motor drives, data bags, lens accessories
For example, the exposure factor control data calculated by the camera body may be controlled by attaching the accessory.

Note that the shift register for address data output (SR) in FIG. 7 and the shift register for data output in FIG.
SL (4) is -), as shown in the tie 11ζ whipyard in Figures 9 and 10, timing /f (TB7)
.

At the rising edge of (TL7), the data input in parallel is taken in, and from then on the timing (Tf3o) to (TB7
), (TLO) to (TL?), the data is serially outputted to the output terminal (OUT) starting from the most significant bit. The shift register that performs this operation has the following circuit configuration. First, eight flip-flops are provided for each bit, to which the data of each bit input in parallel is preset. The output terminal of the flip-flop corresponding to the lower bit is connected to the input terminal of the flip-flop corresponding to the bit immediately above the lower bit. By doing so, the data preset in each flip-70 block is sequentially transferred from the lower bits to the upper bits in synchronization with the clock pulse.

Furthermore, the output terminal of the flip-flop to which data of the most significant bits of the eight flip-flops is preset is connected to the input terminal of another ninth flip-flop. The output terminal of this ninth flip-flop is used as the output terminal of the shift register. By doing this,
The ninth flip-flop is a flip-flop whose most significant bit data is preset in synchronization with the clock pulse.
By taking in the output of the flop, data is output with a delay of exactly one clock pulse.

According to the present invention, various data to be used in the camera body are serially outputted from the camera accessory to the camera body side via a data output means, and a microcomputer installed in the camera body is used. In a camera system that performs exposure calculations based on this serial data, an interface circuit is provided between the data output means of the camera accessory and the microcomputer of the camera body, and this interface circuit can receive the old series data from the camera accessory. Since the data is read and converted into parallel data, it has the following effects.

+tql In the conventional data reading device, a microcomputer reads the serial data of the camera accessory, including 11 serial VCs, and in order to read one data, it is necessary to specify each bit of the data and read each bit based on this. ftrt of multi-column data,
Whereas it took a considerable amount of time to repeat the reading operation, according to the present invention, the data specified by the addressing means is sent to the serial VC in the interface circuit.
In addition to performing the reading operation, the operation of specifying each bit in the conventional device can be omitted, and the time required to process serial data can be reduced compared to the conventional device. ti, in order to perform the exposure calculation on a microcomputer, this operation π requires the step of specifying and reading the necessary data, but in the $ invention, the microcomputer can be seen in advance by this interface circuit and converted into parallel data. Exposure calculations are performed by specifying desired data among the ζ name data in parallel and reading them, and when the desired data is specified and read serially in relation to r non-output calculations as in the conventional device, π comparison is required. The microcomputer is now available as a camera accessory! (c) The time spent on reading is saved ζノ1, and as a result, the distance between each pupil required for exposure calculation is greatly shortened, and the probability that 1fi1 will be short between data reading and exposure calculation and you will miss a photo opportunity. It is possible to reduce the

Well, while the reading is being done in the interface circuit, the microcomputer can be used for other purposes, such as reading data from camera accessories in the interface circuit, as in the fourth complaint of this defense. While I was doing this, I was asked to do so.

A-, D conversion operation or manually set exposure? l1ll
The microcomputer 0 can be configured to perform uniformity-reducing operation of the data data, thereby shortening the sequential operation time of the microcomputer, and during that shortened time, other The microcomputer can be used more effectively by allowing the operation to be performed.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an embodiment of the present invention; Figure 2;
Figure 3 in dark blue is a cross-sectional view showing the mechanism for operating the switch (LS) of the actual example.
S) is a circuit diagram showing a specific example, Figure v5 is an explanatory diagram regarding Nanano 1, Figure 6 is a flowchart diagram showing the overall operation of the Mokushogun example, and Figure 7 is an interface circuit (IF
), FIG. 18 is a circuit diagram showing a specific example of the data output section (7) of this embodiment, and FIGS. 9 and 10 are actuation tie specifying means of this embodiment, SR, : Data output means, Engineering F: Interface circuit, μme1m
: Microcomputer. Applicant Minolta Camera Co., Ltd. Procedural Amendment 1. Indication of the case Patent Application No. 68528 2 of 1980, Name of the invention Camera system Kushikoo data reading device 3, Person making the amendment Relationship to the case Applicant Address Osaka Kokusai Building, 2-80 Azuchi-cho, Higashi-ku, Osaka Name (607) 'Minolta Camera Co., Ltd. k) "Detailed Description of the Invention" column of the specification (b) Figures 6 and 7 of the drawings
Figure, Figure 8 and Figure 1O Figure 6, Contents of correction 1) Change ``Control'' on page 6, line 14 of the specification to ``Control and further perform exposure calculations''. 2) Delete "Power line..." from the 3rd or 4th line of page 8 of the statement. 3) "In the 11th line to the 12th line of page 12 of the specification"
Delete "Manually configured". 4) On page 45, lines 4 to 13 of the specification, [Iruga,...]. ] to "Yes." 5) On page 48, lines 9 and 10 of the specification, change ``transition to interrupt operation when '' to ``transition to interrupt operation when ''. 6) Change r#40J on page 50, line 15 of the specification to r#3
9 Change to j. 7) In front of r#40J on page 51, line 5 of the specification, there is a message that says "As a countermeasure in case an interrupt is generated while reading data from the lens (LE), the terminal (#39) 02) to “Low” and insert “. 8) Delete "Has a focal plane shutter" in the first line of page 52 of the specification. 9) "Because I will do it" on page 5 and 4, line 19 of the specification.
Change ``to do''. 10) Change "Rising" to "Falling" on page 67, line 18 of the statement. 11) Figures 6, 7, 8 and 10 of the drawings
The figures will be amended as shown in the attached revised figures 6, 7, 8, and 10, respectively.

Claims (1)

[Scope of Claims] 1. Fixed storage means having a plurality of addresses, each address fixedly storing data to be used in the camera body, and an address specifying means for specifying the address of this fixed storage means. , the camera accessory is provided with data output means for serially outputting the data of the fixed storage means fixedly stored at the address designated by the address designation means to the camera body, The camera body is equipped with an interface circuit that reads data input to the interface circuit and converts it into parallel data, and a microcomputer that reads the parallel data from the interface circuit and performs exposure calculations based on the read data. Data reading device in camera system. 2 The camera body has a photometric circuit that outputs a photometric value according to the subject light intensity, and an A that converts the output from the photometric circuit from A to D.
-D conversion means, and the microcomputer performs A-D conversion and A-D conversion by the A-D conversion means while the interface circuit is reading data from the camera accessory. 2. A data reading device according to claim 1, which reads data that has been recorded. 6. The camera body has an exposure control data output means for outputting exposure control data manually set on the camera body side, and the microcomputer reads data from the camera accessory using the interface circuit. 2. The data reading device according to claim 1, which reads data from the exposure control data output means while the exposure control data output means is in use.