JPS58166330A - Camera system - Google Patents

Abstract

PURPOSE:To simplify an information transfer mechanism between a camera and accessory by providing an address designating device which designages an address of an ROM to generate an address signal successively in response to a read start signal. CONSTITUTION:Terminals JA1-5 of a lens adaptor are connected to terminals JB1-5 of a camera body side, and reset of a flip-flop DF3 is released by an input of a read start signal (start) from the terminal JB3 to make outputs of a decoder DE3 and an ROMRO1 possible. First of all, by a TA1 pulse from the decoder, an output of a counter CO4 becomes ''01'', by which an output of the ROM whose address is designated is inputted to a shift register SR2 in parallel. This data synchronizes with a clock CP from the camera body side and is read to the body side. Subsequently, by the TA1 pulse, the counter becomes ''10'', and the following designation is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to electrical exchange of various information between a camera body and a camera accessory attached to the camera body, such as an interchangeable lens or a lens adapter.

Prior Art An information fixed storage circuit (hereinafter referred to as ROM) is provided in an accessory (for example, an interchangeable lens) attached to a camera body, and this ROM stores various information specific to the accessory (for example, when the accessory is an interchangeable lens). There are already known devices in which desired information about the accessory is read into the camera body by specifying the address of the ROM (open aperture value, minimum aperture value, etc.). By the way, in such a device, an address signal specifying the address of the ROM is sent from the camera body to the accessory, and the ROM data stored at the address, that is, the accessory information, is read into the camera body. There is a drawback that the number of terminals for transmitting signals between the camera body and accessories, such as terminals for transmitting address signals, increases.

In addition, among various information on camera accessories, position information of setting members that move relative to the camera body, such as the aperture ring of an interchangeable lens that is set on the interchangeable lens side, such as the set aperture value. Some cameras are designed to mechanically transmit the amount of deviation of the camera body from a reference position to the camera body, and convert this mechanical information into electrical information in the camera body. Such a device requires precision in positioning and movement distance between the two, and the mechanical coupling mechanism becomes complicated. Especially when using a zoom lens, the aperture value of the lens changes as the focal length ring, which serves as the appetizer information setting member, is rotated to set the focal length to a desired value. If it is necessary to transmit a large amount of information about the position of a member to the camera body, the mechanism becomes even more complicated, and this is difficult to realize due to the spatial constraints of the connecting mechanism. Various devices have been proposed that electrically transmit information corresponding to the position of a setting member such as the aperture ring to the camera body, but these devices are only configured to transmit one piece of information through one terminal. When trying to transmit multiple types of information based on a signal from one setting member as described above, the accessory side electrically separates or combines the multiple types of information and then transmits this information to the camera. It is necessary to transmit the information to the camera body and convert the data into multiple types of information on the camera body side. Here, in the former case, the number of terminals for signal transmission increases, and in the latter case, the number of bits of the terminal increases, resulting in a complicated circuit configuration.

Furthermore, when there are a large number of types of accessories such as interchangeable lenses, there is also the problem that the data conversion section on the camera body side becomes extremely complicated.

OBJECTS It is an object of the present invention to provide a camera system equipped with an information transmission means that solves the various problems mentioned above.

View 1 The present invention includes a ROM that fixedly stores various information inside an accessory, and an addressing device that sequentially designates addresses of the ROM in response to a read start signal, and a ROM that stores various information fixedly inside the accessory. The point is to start the operation of reading information into the camera body.

Furthermore, the addressing device is configured to output data from a setting position of an aperture ring or the like as address data.

Embodiment FIG. 1 is a circuit diagram of the camera body side showing an embodiment of the present invention, FIG. 2 is a circuit diagram of the lens adapter attached to the camera body, and FIG. 3 is a circuit diagram of the lens adapter attached to the camera body. FIG. 3 is a circuit diagram inside the interchangeable lens that is installed. In Figure 1, (B
A) is a power supply battery, and (Sl) is a photometry switch that is closed in conjunction with a photometry button (not shown). When this photometry switch (Sl) is closed, the transistor (BTI) becomes conductive, and the power-on reset circuit (1) and the exposure control section (5th (Figure), etc. are supplied with power. The power-on reset circuit (]) outputs the /N6 power-on reset signal (FOR) when power supply starts from the power supply line (+V), and this signal (FOR) triggers the flip-flop (PF).
I), registers (REG2) to (REG13), D
Flip Flop (DFI) and Frequency Divider (Dll)
to be reset. In addition, power is constantly supplied from a power source battery (BA) to the counter, flip 70 tube, register, decoder, etc. shown in the figure via a power source line (-to E).

Furthermore, when the photometry switch (Sl) is closed, the inverter (IN
The output of I ) becomes ``High'' and the oscillator (PG
), the Q output of the D flip 70 tube (DPI) becomes 1 old gh" at the rise of the next clock pulse (cp) from ), the gate of the AND circuit (ANI) is opened, and the AND circuit (ANI) A clock pulse (cp) is then sent to the frequency divider (DIl).At the same time, this signal is also given to the one-shot circuit (OSt), and a predetermined signal is sent from the one-shot circuit (051). %High” pulse is sent to the flip-flop (ppt) via the OR circuit (011). This pulse sets the flip-flop (ppl) to
The output becomes 1 old gh〃. Further, this %H4gh'' signal is sent to the inside of the camera body and accessories, and serves as a start signal (Start) for starting the reading operation.

The gate of is heard and the counter (COl), (CO
2) is released from the reset state, and the decoder (
DEI) becomes ready for output. Counter (COI)
is the oscillator (PG) sent through the AND circuit (AN2)
), the decoder (DEI) counts one of the output terminals (TBO) to (Te3) by -1 according to the output of this counter (COI).
Make it ghll. Table 1 shows the relationship between the input and output of this decoder (DEI).

Table 1 Lens adapter terminals (JAI), (JA2) in Figure 2
.

(JAS), (JA4), (JAS) are terminals on the camera body side (JBI), (JB2), (J, B3), (J
B4), (JBI) are connected, (JAs) is a terminal that receives power from the power line (-)-E) from the camera body, (
JA2) is the terminal to which the clock pulse (cp) is input from the camera body, (JAS) is the terminal to which the reading start signal (Start) is input from the camera body, (JA4)
) is the common body ground terminal, and (JAs) is the terminal that outputs data from the lens adapter to the camera body. In addition, the end 1JL1t (JLs) of the interchangeable lens in Figure 3
is a terminal connected to the camera body in the same way as the terminal (JA18J^5) of the lens adapter shown in Fig. 2. From the terminal (JBI) on the camera body to the terminal (JAS) or (JL3)
) When the reading start signal (Start) is input through the counter (COII) and (CO4) in FIG.
, the reset state of the D flip-flop (DF3) is released, and the output of the decoder (DI3) and ROM (ROI) becomes possible. At the same time, this signal (Star
t) is also given to the one-shot circuit (054), and the pulse from the one-shot circuit (084) is used as a flip-flop (FF2).

(FF3) is reset. Similarly, in FIG. 3, the reset states of the counters (CO5), (CO6), (CO7), D flip-flops (DFs), (DFs) are released, and the decoder (DI4) and ROM (RO2)
can be output. Furthermore, one-shot circuit (OSS
) with a pulse from 7-lip flop (FF4), (F
F6) and (FF6) are reset. The counter in Figure 2 (003 person decoder (DI3)) and the counter in Figure 3 (
The C05 person decoder (DI4) is the counter (CO
l), has the same configuration as the decoder (DEI),
Each output terminal (T) of the decoder (DI3), (DI4)
Pulses are output from Ao) to (TAy) and (TLO) to (TL7) at the same timing as the output terminals (TBO) to (Te3) of the decoder (DEI), allowing synchronization between the camera body and the accessory side. It is taken.

(Castle margin) Table 3 Table 2-1.2-2 shows the relationship between addresses and the contents of various data in the ROM in which various data of accessories are stored, and Table 3 shows the relationship between the encoded data and the contents of the various data. This shows the relationship with the content indicated by the data. The operation will be explained below based on Tables 2-1, 2-2 and 3. In FIG. 2, the reading start signal (Start
) is output, the flip-flop (FF2) is reset via the one-shot (θS45), so
Even when the D flip-flop (DF3) is released from the reset state, its b output remains -High';
The switch circuit (ASI) remains conductive.

Similarly, in FIG. 3, the Q output of the D flip-flop (DF5) remains 'Low' and the switch circuit (AS2) remains non-conductive. In this case, data from the lens adapter can be transmitted to the camera body.

First, the output of the counter (CO4) becomes 101 with the pulse of (TAI) from the decoder (DE3), and the ROM (
'0000001' is given as the address of ROt), and the code for checking the lens adapter is '111'.
(The address marked with +5 is specified,
Data of '11100' is output from the ROM (ROI). Then, the flip-flop (FF3) is set by the AND circuit (AN23) at the falling edge of the clock pulse (cp) output during the period when the terminal (TAI) is ``old gh'', and the AND circuit (AN22) It is reset at the falling edge of the clock pulse (cp) output while the terminal (Ta2) is 'High'.Therefore, the Q output of the flip-flop (FF3) is output from the terminal (TA2).
l) 1 old gh only from the falling point of the clock pulse (CP) until the falling point of the clock pulse (cp) when the terminal (Ta2) is set to 1 old gh.
〃, and the rise of the clock pulse (cp) during this period,
That is, at the time when the terminal (Ta2) rises to 'High', data from the ROM (ROI) is fetched in parallel into the shift register (SR2). Thereafter, in synchronization with the rise of the clock pulse (cp) applied to the terminal (C), the above data is sequentially output in series from the upper bit as described below, to the switch circuit (ASI), the terminal (JAs),
(JBs) to the shift register (SR1) in Figure 1
The data from the terminal (JB5) is sequentially taken in one bit at a time in synchronization with the falling edge of the pulse (cp). Since the data sent from the lens adapter is 5 bits, 1 of the data sent at the rising edge of (Ta3)
The bit (TB3) is read into the shift register (SRI) on the camera body side at the falling timing of the clock pulse (cp) between - old gh, and thereafter (Ta4
).

One bit is sent at each timing of (Ta5), (Ta2), and (Ta2). In this way, (TB7)
The reading of one data is completed at the falling edge of the clock pulse during 'High #, and the next terminal (TBO
), the shift register (SRI)
The output data of is latched in parallel in the register (REGI).

The decoder (DE2) on the camera body side has the input and output relationship shown in Table 4.

(Leaving space below) Table 4 Here, the counter (CO2) whose output is given as an input to the decoder (DE2) counts one by one at the rising edge of the terminal (TB7). Therefore, first, the terminal (TBO
) rises and the first data, that is, check data, is latched into the register (REGI), the terminal (do) of the decoder (DIlC2) is -old ghI
It has become I. Therefore, the rising signal of the terminal (Tat) is sent to the register (REG2) via the AND circuit (AN3).
The data from the register (REGI) is latched into this register (REG2). The output of this register (REG2) is the AND circuit (A
If the lens adapter is attached and the value is '11100', the output of the AND circuit (AN15) will be ``GH'', and if the lens adapter is not attached, it will be -Low. Become. The output of this AND circuit (AN ls) is given to a display section (not shown) that displays whether or not the lens adapter is attached.

In Fig. 2, the output of the counter (CO4) becomes 110 when the terminal (TAI) rises, and the ROM (Rol)
The address '0000010' is specified.

Then, from the ROM (ROI), as shown in Table 2-1,
Data indicating the type of lens adapter is output. As shown in Table 3, this data is predefined as 1.00001" for the automatic diaphragm interlocking type bellows and "00010" for the automatic diaphragm interlocking type reverse adapter.

This data is also similar to the above, and the terminal (TBO) is "
At the timing when it becomes “High”, the register of the camera body (
RKGl), and at this time the counter (CO2)
The output is '0010'' and as shown in Table 4, the terminal (dl) of the decoder (DE2) is %)Hghl/, so the register (RE
Gt) is latched.

Also, since the output of the counter (CO4) became '10', the one-shot circuit (OS3)
A pulse is output and the flip-flop (FF2) is set. Then, the terminal (TAQ) is
At the time when the lens adapter type data has been sent (at this time, the transmission of the lens adapter type data has been completed), the D flip 70 tube (
DFa) is the D input (i.e. flip-flop (FF2)
Switch circuit (ASI) with the output (direct output) as 'Low'
is made non-conductive so that no data is transmitted from the lens adapter.

Similar to the counter (CO4) in Figure 2, the counter (COS) in Figure 3 also counts the rising edge of the terminal (TLI), and when the count output reaches '010', the output of the AND circuit (AN25) becomes ')Ihigh', a 'High' pulse is output from the one-shot circuit (O8s), and the flip-flip flop (FF4) is set.Then, the D flip-flop (DFs) in Fig. 2
Similarly, the Q output of the D flip-flop (DFs) becomes %High# at the rising edge of the terminal (TLO), and the switch circuit (AS 2 ) becomes conductive, making it possible to send data from the interchangeable lens. . Then, the next terminal (TL
At the rising edge of l), the output of the counter (Co6) is ' 011
'become. The 3-bit output from this counter (COS) is applied to the lower 3 bits of the (dl) input of the multiplexer (MP2). At this time, the Q output of the D flip-flop (DF6) is still 'Low', so the multiplexer (MP2) outputs the data g from (β1).
A0000011" is output, and this data is stored in the ROM (
RO2) address signal. Then, as shown in Table 2-1, check data '11100' is output from the ROM (RO2), and is read into the register (RuO2) in Figure 1 in the same manner as described above.
AND circuit (AN28) in Figure 3.

(AN29), OR circuit (OR4), flip-flop (FFs).

The shift registers (SRs) each have the circuit shown in Figure 2 (
AN23), (AN24), (OR3), (FF3),
The circuit is similar to (SR2).

The data read into the register (RuO2) is determined by the AND circuit (ANla) whether it is '11100' or not. If it is determined that it is not '11100', it means that the interchangeable lens is not attached, so the AND circuit ( A
The output of Nla) becomes 1 old gh〃, the gate of (ANty) is opened, and the pulse from the terminal (Ta2) is output as the read end r signal (endl). The following terminals (T
LI) rises to %l(i g h//), the output of the counter (COS) is -100", 1101.' 1
10'-111' and the multiplexer (MP2
) from '0000100'-0000101',
"0000110'.

'00001]1'' address data is used sequentially.

Here, as shown in Table 2-1, the above addresses in the ROM (RO2) contain the maximum aperture value AvO, minimum aperture value Avmax, wide side focal length, and Te1e of the interchangeable lens.
The side focal length data is stored. To explain specifically using Table 3, the aperture value data is Fil! : A general aperture value increasing at a pitch of Q, 5 E t , that is, Fl, from 2 to F32 is '00000'L
3] 0011'', which does not correspond to the aperture value of the above 0.5Ema pitch, and which often exists as the open aperture value of the lens + F1.8 to F6.9 is '10100''
~'11110''.In addition, the focal length data is categorized into commonly used focal lengths from 8m or less to 1000g or more as shown in Table 3.
Data of oooooo"~'11110" is defined. As for the focal length data, in the case of a zoom lens, the shortest focal length data on the Wide side is stored at the address ``0000110'', and the longest focal length data on the Ta1e side is stored at the address ``000011''. On the other hand, in the case of an interchangeable lens with a fixed focal length, the focal length data is stored as is at the address "0000110", and data '11111' indicating that the lens has a fixed focal length is stored at the address "0000111". Therefore, the above address data '0000100'N' from the multiplexer (MP2)
By sequentially outputting 0000111', the maximum aperture value, minimum aperture value, wide side focal length,
The focal length data on the Te1e side is stored in the register (REGS) on the camera body side.

(REGS), (REG?), and (R2O3) are read in sequence. Also, the output of the register (REGII) into which data on the Te1e side is read is '11111'.
The AND circuit (AN18) is used to determine whether
If the focal length of the interchangeable lens is fixed, the output of the AND circuit (AN 18 ) will be 1 old ghI. Then, the D flip-flop (DF2) outputs the terminal (Te2) of the decoder (DEl) when the terminal (d6) of the decoder (Dic) is % High #.
) takes in the D input (that is, the output of the AND circuit (AN18)).

In Figure 3, the output of the counter (COS) is 'Il
When l' is reached, the output of the AND circuit (AN26) is
h' rises and from the one-shot circuit (057)'
``High'' t4 pulse is output. This pulse sets the flip-flop (pps) and the next terminal (TLo) becomes 1 old gh/7. This opens the gate of the AND circuit (AN27). counter(
Pulses from the terminal (TLl) are input to CO7), and data from the input (β2) is output from the multiplexer (MP2). The Q output of the D-flip L-flop (DFs) becomes 1 old gh", and the pulse from the next terminal (TLI) is output to the counter (CO
7), the output of the counter (CO7) is v'0
01 //, and the multiplexer (MPI) outputs the data input from blocks (1o) to (α1). This block (1o) outputs data corresponding to the amount of deviation (movement amount) of the distance ring as a distance setting member of the interchangeable lens from the position . This data is designed to output 4-bit data starting with 'oooo' no matter what kind of interchangeable lens it is.This data is sent to the lower 4 bits of the input (β2) of the multiplexer (MP2) as follows. Also, since the output of the counter (CO7) is given to the upper 3 bits, the multiplexer (MP2) outputs 1'0010000'' to '0011''.
111" is output and this is input to the ROM (RO2). The area of the address '0010000"-JOOIII" of the ROM (RO2) is the distance of the interchangeable lens as illustrated in Table 2-1. Data on the photographing distance corresponding to the amount of deviation of the setting member from the ω position is stored. Therefore, this data is read into the register (REG9) of the camera body.

Next, when the output of the counter (Co?) becomes %010', the multiplexer (MPI) moves from block (11) to (
Output the data input to α2). This block (11) outputs data corresponding to the number of aperture steps from the open aperture position of the aperture ring as an aperture setting member of the interchangeable lens. This data is also designed to be output as 4-bit data starting with 'oooo/' for any interchangeable lens. In addition, if it is an interchangeable lens with a fixed aperture (for example, a reflective telephoto type lens),
Only the data oooo' is output. From the multiplexer (MP2) '0100000'' to '0101
111" is output and this data is input to the ROM (RO2). The address of the ROM (RO2) is '0100000 ~' 0101111
As shown in Table 2-1, data on the aperture value corresponding to the number of stops from the open aperture value of the aperture ring of the interchangeable lens is stored. Therefore, ROM(RO2
) is read into the register (REGIO) of the camera body.

In Figure 1, when the data of the set aperture value is read into the register (REGIO), the D flip-flop (D
When the Q output of F2) is -1gh〃, that is, when it is determined that the attached interchangeable lens is a fixed focal length lens, the gate of the AND circuit (AN20) is opened and the terminal (Te2 ) is output as a reading end signal (er+d2), and the reading operation ends. This is because all the data that is subsequently read is related to the zoom lens, so there is no need to read it in the case of a lens with a fixed focal length.

In Fig. 3, the output power of the counter (CO7) p 01
1 //, the multiplexer (MPI) outputs (α
Data from block (12) to 3) is output.

This block (J2) outputs the amount of deviation from the wide side focal length position of the zoom ring as the focal length setting member of the zoom lens, and blocks (10) and (
11), 4-bit data starting from "oooo" is output. From the multiplexer (MP2), '0110000'' to '01111 from (β2)
11' is output, this data is input to the ROM (RO2), and the address area of the ROM (R02) -0110000' to '0111111# is filled with the following data as shown in Table 2-2. Data on the focal length setting corresponding to the position of the focal length setting member is stored, and this data is output from the ROM (Ro2) and read into the register (REGII) on the camera body side.

Next, when the output of the counter (CO7) reaches %100#,
The multiplexer (MPl) also outputs data from (σ3), and the ROM (RO2) has '1000.
] data out of 000υ1001111' are input. This '1000000'~'100111
1" (7) RoM (Iris) (iD 7 F L/
As shown in Table 2-2, data △A of the amount of change in the aperture value due to changes in the focal length of the zoom lens is stored, and this data is stored in the ROM (ROM).
2) You can get out.

Next, when the output of the counter (CO7) becomes X-101, the multiplexer (MPI) outputs the data from the block (12) also from (α3),
(RO2) has '1010000 #~'10111
11" is input. This ROM
The area (RO2) shows how much (f
Data indicating the value of - to what percentage point is the long focus side is stored. To explain this data in more detail, if the value of f - fm x 100% f max - f m is between 0 and 19%, then
”), if it is 20-39% then 2 ('000
10 areas, 3 if 40-59% ('00
100 area, 4 if it is 60-79% ('
The data indicates that the area is 5 ('10000'') when it is 80% to 100%.

At the same time as the data indicating the above area is read into the register (REG13) on the camera body side shown in Fig. 1, a read end signal (end3) is output from the AND circuit (AN21), and a read end signal (end3) is output from the OR circuit (OR3). (
end) is output. This end signal (@nd) is sent to the flip-flop (FFI) via the OR circuit (OR2).
This flip-flop (FFI) is sent to the lycee
Get throated. Therefore, the reading start terminal (start
) becomes 'Low' and the counter (COI), (CO
2) The D flip-flop (DF2) enters a reset state, and the decoder (DEI) also becomes unable to output timing signals.

Similarly, the counters (Cog), (CO4), and
The D-flip 70 tube (DF 3 ) enters a reset state, and the decoder (OR3) and ROM (Rot) become unable to output. Furthermore, the counter (Cog) in Figure 3
, (Cog), (CO7), D flip-flops (DFs), (DFs) are in a reset state, and the decoder (OR4) and ROM (RO2) are in an output disabled state. As described above, the reading operation is completed.

In Figure 1, the photometry switch (
When Sl ) remains closed, the Q output of the D flip-flop (DF 1 ) becomes %H1gh.
// Since it remains as it is, the clock pulse (CP) continues to be input to the frequency divider (Dll) via the AND circuit (ANI), and from this divider (ntl), for example, 4Hz
clock pulses are output. At the rising edge of this 4 Hz clock pulse, the one-shot circuit (052) outputs SSHlgB, # pulses, and the OR circuit (
It is input to the flip 70 tube (FFI) via OR1) and is set again, the Q output becomes ``gh'' and a reading start signal is output. Therefore, if the photometering switch (51) remains closed, the lens adapter.

Data from the interchangeable lens is read repeatedly at a frequency of 4 Hz.

Here, in FIG. 3, blocks (10), (11), (12)
The specific structure of the setting member shown in ) will be explained below based on FIG. 4, taking an aperture ring as an example of an aperture setting member.

FIG. 4 is a circuit diagram showing the configuration of the setting member.

In the figure, the sliding member (VT) is set at a position corresponding to the setting position of the aperture ring (13) (any one of ■ to ■) by mechanically licking the aperture ring (13) on the lens side. . The conduction pattern (CT) is grounded, and the other conduction patterns (PAO) to (PA3) are connected to the power supply path (+E) via resistors, respectively.

Therefore, the contact piece of the sliding member (VT) is connected to the conductive pattern (PA).
When contacting any of the conductive patterns (PAO) to (PA3), the conductive patterns (PAO) to (PA3) selectively change to the conductive patterns (C
The conductive pattern (PAO) that is short-circuited and in contact with
) to (PA3) are connected to the inverter (IN20
) to (IN23) are selectively turned into air gh''.

On the other hand, the contact piece of the sliding member is connected to the conductive pattern (PAO) ~ (P
When not in contact with A3), inverter (IN20)
The outputs of ~(IN23) both become 'Low'.

The output of the inverter (IN23) is the output terminal (d3
) and one input of exclusive OR (EO2). The output of the inverter (1N22) is connected to the other input of the exclusive OR (EO2), and the output of the exclusive OR (EO2) is connected to the output terminal (
dl) and the output of the exclusive or (EOI) are connected to the other input of the exclusive or (F, 01), and the output of the exclusive or (EOl) is connected to the output terminal (dl) and the exclusive or (EOI). Connected to one input of ShivOR (EOO). Then, the inverter (I
The output of the exclusive OR (EOO) is connected to the other input of the exclusive OR (EOO).
The output of OO) is connected to the output terminal (do).

The conduction patterns (FAG) to (PA3) are gray codes, and the inputs and terminals (dO) to (d3) of the inverters (IN20) to (IN23) at each position ■ to [phase] are determined based on this code. Table 5 shows the relationship with the output.

Further, Table 6 shows the number of narrowing stages at each position.

(Yo top margin) Table 5 Table 6 Below, the set aperture value and the setting position of the sliding member (VT) ~
The relationship with [phase] will be explained. For lenses with Fl, 2 to F16, the aperture ring should be F 1.2 (Av=0.
5), the sliding member (VT) is at the position ■, and the terminals (d3) to (dO) output data 'oooo' with the number of narrowing stages O, and Fl, 4 (
If Av=l), the sliding member (VT) is at the position (■), and the terminals (d3) to (dO) output data ``0001'' with the number of stages of diaphragm 0.5. Similarly, if Fl3 (AV=7.5) is set, data 1110'' indicating the number of rubber narrowing stages 7 is output from terminals (d3) to (do), and F16 (Av=8).
When set to , data 111 indicates that the number of refinement stages is 75.
1' is output.

FIG. 5 is a block diagram showing an exposure control section that performs exposure control based on data read into the camera body side of FIG. 1. This figure 5 shows the measures to be taken when an interchangeable lens is not attached or a lens adapter without an automatic aperture mechanism is attached, and how the effective aperture of the lens changes when the lens adapter is attached. (set up)

The photometry circuit (20) receives as input a photodetector (PD) that performs so-called TTL photometry that measures the subject light that has passed through the lens, and its output is converted into A-, D-converter circuit (22).
D-converted. This output is Avo -4-k, where the subject brightness is By, the y maximum aperture value is Avo, and the limited aperture value due to attaching the lens adapter is Awe.
:) When Avc, By −(A'vo −)−
k) Avo 10k (When Awe is set, By -Avc. Furthermore, when a lens adapter without an automatic aperture mechanism is attached, or when an interchangeable lens is not attached, By -Avn is set.Here Avn corresponds to the actual value when the lens is stopped down or the aperture value when the lens is not attached.Also, if only the lens is attached, Bmar AV
0 data is output.

Here, to explain the relationship between Avo -4-k and Avc using a specific example, for example, F 1.4 (Avo=l) ~
Assuming that when a teleconverter is attached as a lens adapter to a F l 6 (Avmx=g) lens, the effective aperture value of the lens becomes one stop smaller, the effective aperture value is F 2 (AV=2). ~F22 (AV-9>
It turns out that.

Here, by installing a teleconverter, the maximum aperture of the lens is limited, for example, the limited aperture value is F4.
If (Amar 4), the effective aperture becomes F4 to F22, and the lens-side aperture between Fl and 4 to F4 (1+ma<4) becomes invalid. On the other hand, F 3.5 (A'0=3.
5) The effective aperture is F4.5 when a lens of ~F22 (Avmax=9) and the above-mentioned teleconverter are installed.
(^Ma = 45) ~ F 32 (Al = 10),
In this case, the limited aperture value due to the installation of the teleconverter is F 4 (Amer 4), so the aperture on the lens side <'i
4 (24), which is valid in all ranges, is a data output device to which data Sv of the set film sensitivity is output, and the adder circuit (26) is connected to this data output device (24) and the A-D exchange circuit. Based on the data from (22), By −(Avo −1−k) −4−Sv = Ev
-(Avo -4-k)By -Awe +Sv
= Ev −AvcBy −Avn −1−
Sv = Ev −AvnBy −Avo
+Sv=Ev−Av.

Perform one of the following operations. This addition circuit (26
) is input to the exposure calculation circuit (4o) and the multiplexer (42).

The exposure calculation circuit (40) further includes a decoder (28).

Data from (30), (32), and (34) are input.

Here, from the decoder (28), the register (R
Data Av for calculating the maximum aperture value of the lens from EGs)
a is from the decoder/(30) to the register in Figure 81 (
Based on the accessory type data number from the register (REG3), the data Awe of the limited aperture 1 shift due to the attachment of the accessory is output from the decoder (32), as well as the accessory type data from the register (REG3). Based on the data, the data k of the amount of change in the aperture value due to the attachment of this accessory is sent from the decoder (34), and the data Av for calculating the set aperture value from the register (REGIO) in FIG. Output.

(36) is a data output device that outputs the data Tvs of the set exposure time, and this data Tv@ is also the exposure calculation circuit (40
) is entered. (38) is a mode setting device which is in an exposure time priority automatic aperture control mode (hereinafter referred to as T priority mode) in which the aperture is automatically controlled according to the set exposure time, film sensitivity value and subject brightness. When is the terminal (T
) is set to 11ghI and the exposure time is automatically controlled according to the set aperture value, film sensitivity value, and subject brightness in aperture priority exposure time automatic control mode (hereinafter referred to as ^priority mode), the terminal (When Al is set to 1 old ghI and the program control mode (hereinafter referred to as P mode) in which both the exposure time aperture and the exposure time aperture are automatically controlled according to the set thin lumen sensitivity value and subject brightness, the terminal (P) is 1 old gh'
In the manual control mode (hereinafter referred to as M mode) in which both the exposure time and aperture are controlled by manual setting values, the terminal - becomes -1ghl. These terminals fTl, (
Al, fP), M are input to the exposure calculation circuit (40), which performs mode calculation corresponding to the mode designation signal from (M), and outputs the data for controlling and displaying the exposure time to the output terminal (OUTa). and a multiplexer (42) to an exposure time control device (50) and an exposure time display device (52) to output data for aperture control (OUTI).
) to the aperture control device (54), and data for aperture display is output from the output end (OUT 2 ) to the aperture display device (56).

Next, the exposure calculation operation in each mode within the exposure calculation circuit (40) will be explained based on the flowcharts of FIGS. 6-1 and 6e2. In step #1, the open aperture value Avo -1-k based on the change in aperture value caused by attaching the lens adapter is compared with the limited aperture value Avc caused by attaching the lens adapter, and Avo -
)-k :) If Avc, go to step #2, Av
If o -4-k < Avc, the process moves to step #38. When moving to step #2, the data input from the addition circuit (26) to the exposure calculation circuit (40) is Ev - (Ago -1-k), and in step #2, Ev - (Avo ”-k) +(Avo-1-k)
= Ev is calculated, and an exposure value Ev that is not affected by the open aperture value is calculated.

In the following step #3, the terminals (Tl, (Al, (P), M) given from the mode setting device (38) are
l The mode is determined based on one of the mode designation signals, and if it is T priority mode, go to step #4, if it is A priority mode, go to step #14, if it is P mode, go to step #24, If it is M mode, the process moves to step #34.

First, the case of the T priority mode from step #4 will be explained. In step #4, calculate Ev - Tvm = Ave, and then calculate the effective aperture value Awe and Avo.
-) Determine the magnitude relationship between k and Avmax -4-k. Here, Avo −1−k < Awe (A
If vmax +, it means that control to this effective aperture value Awe is possible, and in step #6,
The number of aperture stages, that is, (Awe - k) - AwQ is calculated and the data of this number of aperture stages is output to the output terminal (OUTt).
4) is input. When the aperture is narrowed down based on this value, the aperture value of the lens alone becomes Awe -k, but since the lens adapter makes the aperture smaller by k, the effective aperture value becomes Ave. In addition, the data Awe of the effective aperture value calculated in step #4 is transferred to the output end (
This effective aperture value is output to OUT2) and displayed on the aperture display device (56). In step #8, data Tvs of the set exposure time is output to the output terminal (OUT3). Then return to step #l again and perform the same operation.
This is repeated until the shutter release is performed.

If it is determined in step #5 that Awe (Avo) is ten, it is impossible to control the aperture to the effective aperture value of Awe, so Av.

The data is set as the set aperture value data Avs, and the mode shifts to the A priority mode starting from #14. Also, if Awe ) Avrllax -) k is determined in step #5, it is impossible to control the aperture as described above, so Avm
Shift to A priority mode with ax as the set aperture value.

In addition, Ave (Avo -4-k or Ave
:) When Avmax 10k is determined, the exposure time determined based on the newly set Avo or AvmaX is Tv == 7v m (maximum exposure time) or T
If the exposure time is outside the range of exposure time that can be controlled by v = Tvrrmx (minimum exposure time), it will be impossible to take a picture with proper exposure. In these cases, the effective aperture value is Avo +'
k, exposure control is performed by setting the exposure time to Tv■, and also performs an under warning, and changes the effective aperture value to Avma.
It is desirable to perform exposure control by setting the x+ζ exposure time as T v max and to issue an over warning.

Next, the A priority mode from #14 will be explained. First, in step #14, Ev-(Ava-4-k)==Tv is calculated. As mentioned above, for Ava 1, set the aperture value of the lens to A.
This is the effective aperture value Awe when controlled to vs. next,
It is determined whether the calculated exposure time data Tv is within a controllable range, and Tvsm (Tv (TVm
In the case of aX, the data on the number of aperture stages of AI-Avo is sent from the output end (OUTl) to the aperture control device (54), and the data on the effective aperture value of Ava is sent from the output end (OUT2) to the aperture display device (56). , exposure time data Tv is sent from the output terminal (OLrr3) to the exposure time control device (50) and the exposure time display bag! (52) and return to step #1. When the Tv mark is determined in step #15, the T mark is used as the set exposure time and the mode shifts to the T priority mode from step #4. At this time ^vi=
If A is 0, it is impossible to control proper exposure, so it is desirable to issue an under warning and perform control based on Avo and Tv-. On the other hand, when Tv ) Tvmax is determined, Tvmsx is set as the set value and the mode shifts to T priority mode. In this case as well, if it is determined that Avs = Avmax, an over warning is given and Av
It is desirable to control exposure based on max, Tvmax.

Next, the P mode from #24 will be explained.

First, in step #24, p*EV = Awe (Q (p (1)Ev
- Awe = Tv is calculated, and then it is determined whether Awe is within a controllable range. And Avo +k (If Awe < Avmsx -1-k, then (Awe -k) -Av.

The data of the number of refinement stages is outputted to the output terminal (oUTl). As in the case of the T priority mode, this data is the number of stops of the lens-side aperture to achieve the calculated effective aperture value kve. Then, the effective aperture value data Awe is outputted to the output terminal (OUT 2 ), the calculated exposure time data is outputted to the output terminal (OUTa), and the process returns to step #1. In addition, when Awe (Avo -1-k) is set, in step #3o, Avo is used as the set aperture value data and the mode returns to the A priority mode from #14, and conversely, Avmax -) -k is set. If so, in step #32, Avmax is used as the set aperture value data, and the process shifts to the A priority mode from #14.

Next, in the case of M mode, the output terminal (0υTl) has data Avs − of the number of aperture stages based on the set aperture value Ays.
Avo is the effective aperture value Av@- at the output end (0υT2)
)-k, the set exposure time data Tvs is outputted to the output terminal (OUT3), and the process returns to step #1.

Now, if it is determined in step #1 that Avo -1-k (Avc), then the arithmetic circuit (40
) is input from the adder circuit (26) to the E mark A.
Since we, (Ev −Avc) +Awe = Ev operation is #3
In step #39, the exposure control mode is determined and the process proceeds to the calculation flow for each mode shown in FIG. 6-2.

In Figure 6-2, in the case of T priority mode, first #40
In step , Ev - Tvs = Awe is calculated, and then it is determined whether Awe is within a controllable range. At this time, if Avc (Ave (Avmax-4-), then (A
ve -k) -Avo, Awe, Tvs
data to the output terminals (OUTI) and (OUT2), respectively.
, (OUT3) and return to step #1. In addition, if Ave (Awe), Avc -k is set as the aperture value and the flow shifts to the A priority mode from #61.In addition, at this time,
If Tvs = Tv-, proper exposure is impossible, so
It is desirable to issue an under warning and perform exposure control using Tvm as the set value for Awe -.On the other hand, for Ave') Avmsx +, A priority flow from #51 with Avmex as the set aperture value. , but in this case too, Tvs
= Tvmax, it is desirable to issue an over warning.

Next, the operation in the A priority mode from step #50 will be explained. First, in step #50, when it is determined that Avs 10k:) Avc, Ev - (Avs -4-k) = Tv is calculated, and then it is determined whether Tv is within the controllable range. Make a judgment. At this time, Tvm <Tv (If Tvmax, Avs −Avo, Ays −)−k,
Tv data is output to the output terminal (OUTI) and (OU
T2), (OUT3) and return to step #1.

Also, if Tv (Tv = +), Tvm is set as the exposure time and the flow shifts to the T priority mode from #40, while Tv ) Tv
If it is max, Tvmax is set as the set exposure time and the flow shifts to the T priority mode.

At this time, if Avs = Avmax, it is desirable to issue an over warning and perform exposure control using Avmax and Tvmax.

If it is determined that Avs 4-k (Avc) in step #50, the flow moves to #61 and below.In this case, the set aperture of the lens is larger than the limited aperture value by attaching the lens adapter. Since the effective aperture value based on the value is on the open side, the actual effective aperture value is Avc.In this case, reset Avc as the effective aperture value and calculate Ev - Avc = Tv, so that Tv is It is determined whether it is within the controllable range. Then, if Tvm (Tv (Tvmax), the process moves to step #64 and the output terminal (
The data with the number of refinement stages O is at the output terminal (OUTl).
The effective aperture value Awe data is stored at the output end (OUTz).
Exposure time data Tv is outputted to OUT3), and the process returns to step #l. Also, Tv (Tvs
+b, the set effective aperture value is the widest aperture value Avc, so correct exposure is impossible.
In this case, the process proceeds to step #64 using the value Tva+++ calculated in step #63. Note that at this time, it is desirable to also issue an under warning. On the other hand, if Tv ) Tvmax , the flow transitions to the T priority mode using Tvmax as the set value.

In case of P mode, p@Ev in step #70
= Ave Ev - Awe = Tv is calculated, and the following operations are similar to those in the T priority mode from #C41.

In the case of M mode, in step #80, Avs -1-
k:) If it is determined that it is Avc, the process moves to steps #81 and below, and the number of narrowing stages is Alow, Ama0. Data on effective aperture value Ave and exposure time Tvs are output to the output terminal (OUTl).
, (OUT2), (outTs) and return to step #1. On the other hand, in step #80, Avs
-4-k (If it is determined that the
v+s is the output terminal (OUTI), (OUT2), (OUT
a) Output from and return to step #l.

Note that if only an interchangeable lens is attached, the first
The output of the register (RIG3) in the figure is 'oooooo', and the photometric data is By-Avo. In this case, from the decoders (30) and (32), Avc =
If the data of Q, k = 0 is output, the normal exposure calculation according to the aforementioned flow (Fig. 6-1) will be performed.

The remaining portions of FIG. 5 will be explained again. decoder(
Step 44) determines whether the lens adapter is equipped with an automatic diaphragm mechanism or not based on the lens adapter type data from the register (RIG3).

As shown in Table 3, when the data indicating that the accessory is not equipped with an automatic diaphragm mechanism is input, the output of the decoder (44) becomes N old gh〃, and when other data is input, `` becomes LOW. Also, the lens is not attached, so the register (RI) shown in FIG.
When the check code '11100' data is not input to G4), the output of the AND circuit (AN16) becomes 'Low' and the input level to the OR circuit (46) in Figure 5 becomes 'High'. become. Therefore, when a lens adapter without an automatic aperture mechanism is attached or an interchangeable lens is not attached, the OR circuit (
The output of 46) becomes 'High l'. At this time, since there is no need to control the diaphragm, this output is given to the diaphragm control device (54) and the control device (54) becomes inactive. In addition, since the aperture display does not need to be displayed except when displaying the set aperture value, in T priority mode and P mode in which the aperture is automatically controlled, the output of the OR circuit (60) and the Due to the output of the circuit (46), the output of the AND circuit (62) becomes 1 old gh, and the aperture display in the aperture display device (56) is made inactive.

Next, regarding the exposure time, since the lens adapter does not have an automatic aperture mechanism, the output of the OR circuit (46) is 114i.
gh' and the selected mode is other than M mode (terminal (M) is -'Low'), AND circuit (48)
A 'High' signal is output from. This signal is sent to the selection terminal (SE) of the multiplexer (42),
In this case, the Ev - Avn data from the addition circuit (26) based on the photometry of the subject light that has passed through the manually aperture of the lens, that is, the aperture photometry, is output as is. Then, this data is displayed as an appropriate exposure time on the display device (52), and the exposure time is further controlled by the exposure time control device (5o) based on this data. In other words, it becomes an aperture-priority exposure time automatic control mode using aperture metering. On the other hand, OR circuit (46
) Even if the output of
) becomes 'Low' and is sent to the multiplexer (4
2) is the set exposure time T from the exposure calculation circuit (40).
The vs data is output as is, and display control is performed based on the data Tv@. Also, the OR circuit (46
) is 'LOW', the exposure calculation circuit (40)
Display control is performed based on data from.

In a zoom lens with a variable focal length, a typical focal length distance of at least 3 is provided on the setting member for focal length adjustment.
Although it is possible to infer the set focal length to some extent, it is also possible to find out more specific focal length values, or to what extent within the adjustable focal length range the set focal length falls. It is impossible to judge at a glance.

An embodiment in which the above information regarding the set focal length is made visible within the finder of the camera will be described below. Here, the register (RIG7) in Figure 1,
(RIG8), (REGII), (RIG13) the shortest focal length, longest focal length, set focal length,
FIG. 8 is a block diagram for carrying out the first example, and FIG. 8 is a diagram showing the display section of the first example. Further, Tables 7-1 and 7-2 show values regarding focal lengths of various zoom lenses.

Table 7-1 In Tables 7-1 and 7-2, the lens type indicates the range from the shortest focal length to the longest focal length of various zoom lenses, and the focal length is set and input to each zoom lens. This indicates the set focal length. As mentioned above, this data is input with commonly used focal length data, but since the set focal length data from block (12) in Figure 3 is 4 bits, it is better than that shown in Table 5. It is also possible to create data that is more finely divided. The IO・Iog2 column shows 10・of each setting focal length f.
It shows the value of Iog*, (, and the difference column is 10・Ioggf −1O−10ft when the shortest focal length is f−
'-' value is shown, and the display data column is '00001' if the value of f -fsb 101 00frr -fsk is O~19, '0001.0'' if it is 20~39, 'ootoo' if it is 40~59.
, 60-79 is 10]000! , if it's 80-100'
10000'.

In order to obtain these various data by dividing them into smaller pieces, input the data from block (12) in Figure 3 directly into the camera body, and then input the data corresponding to the shortest focal length and longest focal length (the The set focal length, 10 log
2' can be used to obtain difference data and display data.

In Fig. 7, the data on the shortest focal length from the register (REG7) is converted into display data by the decoder (DEIO) and sent to the display device (DPI), and the shortest focal length is displayed as a numerical value as shown in Fig. 8. Is displayed.

The longest focal length data from the registers (REGs) is converted into display data by the decoder (DEII), and the longest focal length is displayed numerically on the display device (DP2) as shown in FIG. In addition, the set focal length data from the register (REGlt) is converted into display data by the decoder (DE12), sent to the display device (DP3), and displayed numerically on the display device (DP3) as shown in Figure 8. Ru. Further, the % data from the register (REG18) is sent to the display device (DP4) and displayed on one of the display sections (el) to (e5). That is, if '00001' (
el), 'oooio' (e2), ' 0010
0' is (ea), 'to1000' is (e4)
, 1″10000′, (e5) is displayed, indicating what percentage of the overall performance the set focal length is.

Note that (60) indicates the field of view within the finder.

FIG. 9 is a block diagram showing a second example for displaying the set focal length in the finder, and FIG. 10 shows an example of the display section. Decoder (DE15) and (
DE16) are registers (REG8) and (REGII), respectively.
) from Qalogdmax, xos+og*f
These two decoders (DEls) convert data into data.

The data from (DE16) is input to the subtraction circuit (70), and the data of ]0·log@()maw/f) is output. This data is input to the decoder (72), and one of the terminals (fo) to (f24) corresponding to the data from the subtraction circuit (70) becomes 'High'. That is,
If the data from the subtraction circuit (70) is 24, the terminal (f24
) is 23, the terminal (f23) is connected, and similarly, if the data is 1, the terminal (fl) is 0, ~(f22) is connected through a diode and is connected to the terminal (gt), and the terminals (f2t) ~ (
ft9) is connected to the terminal (g2) through the diode, and the terminal (
fl) ~ (fts) operates the diode to connect the terminal (gs)
, (flz) ~ (f6) becomes (g4), (f5) ~ (
fO) are connected to (gl), respectively. The display device (74) then responds to the outputs of the terminals (gl) to (gs).
One of the display lines (hl), (h2), (h3), and (M) provided within the viewfinder field of view (60) in FIG. 10 is displayed.

The display lines (hl) to (h4) in Fig. 10 indicate the field frame visible within the viewfinder field of view when the focal length is set to the maximum focal length, and is 10oI1w1 to 50- Taking a zoom lens as an example, when the set focal length is 500 to 360 m, the terminal (g4) becomes gh and no line is displayed;
At ~25-, the terminal (g4) becomes %High# and the line (h4) is displayed, and at 200'' 18(m) the terminal (gs) becomes gh〃 and the line (h3) is displayed, and at 135 ~120mm, terminal (g2) is %H
1gh I becomes line (h- is displayed, 120m
If it is less than m, the terminal (gs) becomes 'XHigh/' and a line (ht) is displayed. Therefore, in this example, how much further can you close up by shifting the focal length to the long focal length side? 0, which can display whether it is possible.
Display unit (DPt).

CDP, I), (In DPρ, the shortest focal length, longest focal length, and set focal length are displayed numerically as in the first example.

In addition, the shift registers (SR-, (SR
As the configuration of a), (TAy) and (TLy) are 'High
ROM (ROl), CHD, ) at the timing of h'
data is taken in parallel, and the next (TAQ)
, the data becomes 1 from the rising edge of (TLO).
Although it is assumed that bits are sequentially output to the camera body side, the specific configuration of this shift register is as follows.

That is, a clip flop is provided for each bit to which the data of each bit input in parallel is preset, and the output terminal of the clip 70 tube corresponding to the lower bit is connected to a flip flop corresponding to the bit immediately above the lower bit.・Connect to the input terminal of the flop to sequentially transfer the data preset in each flip/frog from the lower bit to the upper bit in synchronization with the clock pulse. Furthermore, is there another flip-flop apart from these flip-flops? When g9 connects the input terminal of the flip-flop to the output terminal of the flip-flop corresponding to the most significant bit, the fetched data is output from this separately provided flip-flop with a delay of one clock pulse.
Bit by bit will be output.

In the above description, the reading start signal (star
t) flips due to the closing of the photometric switch (Sl).
70 tubes (FFp), but in this way, instead of outputting through the flip-flop (FFp), the power line (+V) generated by the closing of the photometric switch (S) is used. Reading start signal (5tar
t), and this voltage signal may be transmitted to the accessory via the connection terminal (JBa)k. Note that the timing at which the reading start signal (5tart) is generated is not limited to when the photometry switch (Sl) is closed, but may be generated at any time prior to the start of exposure of the camera body. Furthermore, it goes without saying that the above-described embodiments may be replaced with the above-mentioned embodiments, and the above-described embodiments may be constructed so that the operation is controlled in a sequential manner.

Effects The present invention stores various types of information about the accessories attached to the camera body, and when the camera system is structured such that this information is read into the camera body, the information is stored inside the accessories. An addressing device that sequentially specifies the address of the fixed memory circuit in which the above information is fixedly stored is installed, so that the camera body and accessories can be connected to each other.
There is no need to provide an addressing terminal between the two terminals, and an increase in the number of signal transmission terminals can be prevented. According to this embodiment, a signal based on the drive of a setting member such as an aperture ring that sets variable contact information (for example, aperture value) of an accessory is used as an address signal, and based on this, the address signal of the fixed memory circuit is , it is possible to electrically transmit variable information signals such as the aperture value, and the conventional problems of complicated coupling mechanisms and spatial restrictions can be solved.

Furthermore, since the addressing device is configured to sequentially output multiple types of information related to signals based on the movement of the focal length setting member of a zoom lens, for example, the addressing device is configured to sequentially output multiple types of information based on the movement of the focal length setting member of a zoom lens. Transmission of multiple types of information based on signals increases the number of signal transmission terminals,
This is possible without increasing the size of bits for signal transmission, and has the effect of solving the conventional problem that the data conversion section within the camera body is extremely complicated.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the camera body side of the present invention, and FIGS. 2 and 3 are accessories.
FIG. 4 is a diagram showing a specific circuit configuration of the setting device; FIG. 5 is a block diagram showing the configuration of an exposure control section on the camera body side to which the present invention is applied; 6th-
1 and 6-2 are flowcharts, and FIG. 7 is a block diagram showing another application example of the present invention in which when the accessory is a zoom lens, the set focal length can be displayed within the camera body. FIG. 8 is a diagram showing an example of the display, FIG. 9 is a block diagram showing another embodiment of FIG. 7, and FIG.
The figure shows an example of the display. Rot, RO2...Fixed memory circuit, CO4, CO
s, CO7, DE3. DE4, MPI, MP2...addressing device,
SR2, SR3, ASI. AS2...information transmission device, SRI, REGI~REG
I 3... Information reading device, s l , BTH, j...
- Reading signal generation circuit, 10°11.12...setting device, VT...sliding member, PAO to PA3. lN2O to lN23. EOO~EO2...Signal output member. Applicant Minolta Camera Co., Ltd. Figure 7 Figure 8 Figure 9 Figure 10 Procedural amendment 1, Indication of the case 1982 Patent Application No. 49768 2, Name of the invention Camera system 8, Person making the amendment Related Applicant Address 2-80 Azuchi-cho, Higashi-ku, Osaka Osaka Kokusai Building voluntary amendment 5, subject of amendment

Claims (1)

[Scope of Claims] 1. A fixed memory circuit that stores various information on accessories attached to the camera body, and an information transmission device that can transmit the stored information to the camera body in response to a read start signal. In a camera system in which an accessory is provided and information on the accessory is read into an information reading device of the camera body. An addressing device is installed in the accessory that designates the address by sequentially generating address signals in response to the reading start signal number ζ for transmitting information stored at a predetermined address of the fixed memory circuit to the camera body. A camera system characterized by being provided in. 2. The addressing device includes a timing pulse generation circuit that generates a predetermined timing pulse in response to the reading start signal, and a counter that counts the pulses from this circuit and uses the counted value for the addressing. A camera system according to claim 1, comprising: 3. The addressing device includes a setting member that is driven to set information on the call←豐◆→accessory, and the setting member includes a sliding member that slides in conjunction with the operation of the setting member; 2. A camera system according to claim 1, further comprising a signal output member that outputs a signal corresponding to the sliding position of the sliding member. 4. The camera system according to claim 3, wherein the setting member is a lens distance setting member. 5. The camera system according to claim 3, wherein the setting member is an aperture setting member of the lens. 6. The camera system according to claim 6, wherein the setting member is a lens focal length setting member.