JPH02110438A - Camera having data communicating function - Google Patents

Abstract

PURPOSE:To shorten time and to effectively communicate data by repeating data input from an accessory and changing the number of the data to be inputted to the title camera according to the proceeding state of the prescribed operation of the camera during a period when a manual operation is executed. CONSTITUTION:The camera is equipped with a data input means 14 to start in response to the manual operation to manual operating members SW1-3 and serially input plural types of data held by an accessory 5 through a terminal part, a control means to operate the data input means 14 at prescribed time intervals at least during the period when the manual operating members SW1-3 are manually operated, and a changing means to change the number of the data to be inputted from the accessory 5 according to the proceeding state of the prescribed operation of a camera body 1. Consequently, during the period when the manual operating members SW1-3 are operated, the data input from the accessory 5 is repeated at the prescribed time intervals, and the number of the data to be inputted is changed according to the proceeding state of the prescribed operation of the camera. Thus, the data can be communicated efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a camera to which a camera accessory (for example, an interchangeable lens, an electronic flash device, etc.) is detachably attached, which has the function of outputting multiple types of data in series. Regarding.

2. Description of the Related Art Conventionally, when performing a predetermined exposure calculation, data necessary for each time is input in parallel (for example, Japanese Patent Laid-Open No. 51-6541,
It is common practice to input all the data of an interchangeable lens in series at a predetermined timing (for example, Japanese Patent Application Laid-Open No. 54-108628).

Problems to be Solved by the Invention When communicating data between a camera and a camera accessory, it is preferable to communicate data in series with the latter rather than with the former in order to reduce the number of terminals between the two. This is desirable. However, serial communication takes time equal to the number of bits of data, which is disadvantageous when performing a predetermined operation based on a plurality of data. Also, the type of data required by the camera is not always the same and changes depending on the progress of the camera's operation, but if all data is input at all times, the amount of data required to input unnecessary data will be reduced. It would also be a waste of time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a camera that eliminates the above-mentioned disadvantages and allows efficient data communication.

Means for Solving the Problems The present invention provides a manual operation member that is manually operated to start a predetermined operation of a camera, and a plurality of types of accessories that are activated in response to the manual operation of the manual operation member. a data input means for inputting data in series through the terminal section; a control means for operating the data input means at predetermined time intervals at least during the period when the manual operation member is manually operated; and a control means for inputting data from an accessory. and a changing means for changing the number of data according to the progress state of the predetermined operation of the camera body.

Operation With the above configuration, data input from the accessory is repeated at predetermined time intervals while the manual operation member is being operated, and the number of input data is changed according to the progress state of the predetermined operation of the camera. This allows the camera to input only the data that is needed at that time.

Embodiment FIG. 1 is a block diagram showing the entire photographic system using the present invention. (L) is a camera body, and inside this body, address data is output for accessories attached to or connected to the camera body, and
A central control circuit (10) is provided for inputting data from.

(2) is an electric drive accessory (motor drive)
A data output device (20) for outputting data specific to the motor drive is provided inside the motor drive. (
3) is an accessory (strobe) for flash photography, and a data output device (30) for outputting data specific to the strobe is provided inside. (4) is a lens accessory such as an intermediate ring or a bellows, and a data output device (40) for outputting data specific to the lens accessory is provided inside this lens accessory. (5) is an interchangeable lens, and a data output device (50) for outputting data specific to the interchangeable lens is provided inside this lens. Camera body (1) and accessories - (2), (3), (4)
) and between accessories (4) and (5),
They are electrically connected through terminals (a) to (f), respectively. Here, as described later, terminals (a), (b),
Electric power, reference clock pulses, address data, and reset signals are supplied from the camera body (1) to the data output device of each accessory via (C) and (d), respectively. Further, data specific to each accessory is supplied to the camera body (1) from the data output device of each accessory via the terminal (e). Terminal (f) is a ground terminal.

FIG. 2 is a block diagram of the central control circuit (10) of the camera body (1). (11) is a power supply control circuit which supplies power from a terminal (a) to a data output device (50) of an accessory such as an interchangeable lens (5). (SWl)
is a switch that is closed when the lens (5) is attached to the camera body (1). (SW2) is a release switch for starting exposure control operation, and (SW3) is a photometry switch for starting photometry operation. For example, when the release button is pressed in the first step, the photometry switch (SW3) is activated in the second step. The eye closes the release switch (SW2). The photometric switch (S W 3 ) may close in response to a change in resistance of the pressure-sensitive element caused by the current flowing through the user's finger or the pressure of the finger when the user's finger touches the release button. (12) is a timing circuit, and the address output device (13) and the data input device (
14) to control the output of address data and the timing of data capture, respectively, and a reference clock pulse to terminal (b), and a reference clock pulse to terminal (b).
d) supplying a reset signal to Address output device (1
3) is controlled by a timing circuit (12),
Address data is serially output bit by bit from terminal (c). Data input device? The ffi (14) reads data unique to each accessory that is serially input bit by bit from the terminal (e), converts it into parallel data, and sends it to the arithmetic circuit (15). The arithmetic circuit (15) calculates data for exposure control and the like based on the above data, and sends the data to the exposure control device (16), shutter control device (17), and display device (18), respectively.

Table 1 is a table showing an example of the contents of a ROM that is provided for each data output device of each accessory and stores data unique to each accessory.

Table 2 is a table showing the relationship between the above data output from the ROM and the meaning of the data. In Table 1,
The upper 2 bits (aO) and (a5) of the address data are
This is data indicating which accessory, that is, which ROM to select, and is "10" if the selected accessory is an interchangeable lens, "01'° if the selected accessory is a strobe, and "11" if the selected accessory is a lens accessory. Also, Table 1
Although it is not shown, if it is a motor drive, it is 00″
It is.

The lower 5 bits (a4) to (aO) of the address data are R
This specifies the address of OM. Next, input data when various accessories are installed will be explained based on Table 11 and Table 2. Focal length: 50 mm, maximum aperture: F
1.4. In addition to the minimum aperture value F16, a case will be described in which a lens capable of outputting distance information corresponding to the amount of lens protrusion is attached.

First, as mentioned above, data unique to the lens is output from the lens by using the upper two bits of the address data (aO
), (a5) is 10''.

When the lower 5 bits (a4) to (aO) become 'ooooo', the interchangeable lens will issue a check code ''111' indicating that the lens is attached to the camera body (1).
00" data is output. Therefore, when specifying the address "1000000" from the camera body, the data "'111" is output.
If data 00' is input to the camera body (1), it can be confirmed that an interchangeable lens is attached. Similarly, as shown in Table 1, if the data "l l l OO"' is input to the camera body when "'otoooooo" is specified, it means that the strobe is attached, and the data is 1100000. ”, if data of 11100゛' is input to the camera body, it means that the lens accessory is attached.

Next, when the address "'1000001" is specified, it means that the address of the ROM where the data of the open aperture Avo is stored is specified, and the data "00010" of Fl, 4 is sent to the camera body. .Next “'10
If the address “00010” is specified, the minimum aperture A v
For example, data "01111'' of Fl6 is sent. This data corresponds to Fl6 as shown in Table 2.

When the address "1000011" is specified, a signal indicating whether the attached lens is configured to output distance information is output. For example, in the case of the 50mm F1.4 lens in Table 1, it is a lens that outputs distance information, so o o
o o o” data is output, while 28mmF2
In the case of the lens, distance information is not output, so “0
0001'' data is output.

Next, when the address ``1000100'' is specified,
This means that the address of the ROM in which focal length data is recorded is specified, and since the focal length is 50 mm for a 50 mm F1.4 lens, the data ``'00110'' indicates that the focal length is within the range of 40 to 60 mm. " is output. Also, data on the amount of lens protrusion, which will be described later, is used as address data of the lens ROM, and the distance information is output based on this address data. When the amount of protrusion data is "l O000". If,
When the address "1010000'" is specified, the data "11111" corresponding to the distance ω is output, and if the protrusion amount data is "11111", the address "1011" is output.
111" is specified, and data "00111" corresponding to a distance of 1.4 m is output.

Next, when a strobe is attached, as with the lens, when the address "'0100000" is specified, the check hood "11100" is input to the camera body, indicating that the strobe is attached. is confirmed.

Next, the address "0100001" is specified.

This address stores the data of the minimum guide number, for example, the data “00” for guide number 1.4.
010'' is output.Next, when the address ``0100010'' is specified, data of the maximum guide number is stored in this address, and for example, data ``10010'' for guide number 28 is output. next,
When the address "010001 bit" is specified, the light distribution characteristic data is stored at this address, and in this example, the data "00001" is output.This data is 45 degrees in the vertical direction and 60 degrees in the horizontal direction. °.

11000 if lens accessory is attached
When the address 00'' is specified, the check code ``11100'' is input into the camera body, confirming that the lens accessory is attached, and ``1100'' is input.
When the address of 001''' is specified,
If the data "1" is input, it is confirmed that the teleconverter is installed.As shown in Table 2, if the data is "00001", it is a bellows, and if the data is "00010", it is a bellows. Reverse adapter ″00
If it is 100'', it is confirmed that the intermediate ring is attached.

Although not shown as an example in Table 1, when a winder (motor drive) is installed, the winder uses the upper 2 bits (B6
), (B5) is 00'', data unique to the winder is input to the camera body.

And like other accessories, "o o o
.

If you specify the address ``o o o'', the check code ``11100'' will be input into the camera body, and 0000 will be input.
When the address 001'' is specified, data on the number of images that can be taken per second (frame speed) is input.As shown in Table 2, the data is 'o o o o.

'° means 1 frame/second, and "01100" means 7 frames/second.

Figure 3 shows the address output device (1) on the camera body (1) side.
3), a partial circuit of the data input device (14), and a specific example of the data output device of each accessory. FIG. Note that an interchangeable lens is shown as an example of an accessory. Further, FIG. 4 is a time chart of FIG. 3. In FIG. 3 (OSC) is a reference clock pulse output circuit. A clock pulse (CP in FIG. 4) from this circuit (OSC) is also sent to the lens (5) via the terminal (b). (CNTI) is a counter that counts clock pulses (CP), and (DECI)
are the outputs (CBO) and (CBI) of the counter (CNTI)
, (CB2) is a decoder that decodes data of
The output of this decoder is (TBO) to (TB7) in Figure 4.
The timing signal is shown below. In addition, the lens (5
) side, the counter (CNT2) and decoder (D
EC2) is the counter (CNTI) on the camera body (1) side.
This decoder (DECI) has the same configuration as the decoder (DECI).
The output of DEC2,) is (TLO) to (TL7) in Figure 4.
The timing signal is shown below.

The outputs of the two decoders (DECl) and (DEC2) are connected to a counter (C) that counts the same clock pulses (CP).
Since the output of NT1) (CNT2) is decoded,
The same timing signal is output, and the circuits on the camera body (1) side and the lens (5) side are synchronized. Table 3 shows the counter (CNT1), (CNT2) and decoder (DEC
The relationship between the outputs of (DEC2) and (DEC2) is shown below.

When the camera body outputs a reading start signal, the flip
The value 70 (Fl) is set (FIQ in FIG. 4), and the reset state of the counter (CNTI) is released.

As a result, the counter (CNTI) starts counting clock pulses, and the decoder (DECl) starts outputting timing signals (TBO) to (TB7). In addition, the counter (CNTI).

When the output of (CNT2) is 'ooo', the decoder (DE
C1), (DEC2) AND circuit (AN2), (AN
6) is “High”, the AND circuits (AN2) and (AN6) output the counter (CNT
l), (CNT2) starts counting, “
'High' level timing signal (TBO), (T
LO) is output.

First, in step (So) in FIG. 4 (from when the read start signal is output until the first timing signal (TB7) is output), at the timing when (TBI) rises to 'High''', The address data “1000000°°” is latched in the register (REGl), and the address data “1000000°°” is
) is output and the AND circuit (AN
This data is latched in the shift register (SRI) at the timing when the output of the flip-flop (F2) falls to Low. During this step (SO), the Q output of the flip-flop (F2) ) is “LOW”, other circuits do not operate. (S The output (CR2) rises to "High'" (Figure 4 CB
3) As a result, the D input of 7 rip and 70 rip (F2) is taken in, and the Q output becomes "High" (Fig. 4 F2Q).
). As a result, the gate of the AND circuit (ANI) is opened and a clock pulse is supplied to the shift register, and the reset state of the circuit on the lens (5) side is released via the terminal (d). The shift register (SRI) transfers the latched address data "1000000'" from the terminal (C) to 1 in synchronization with the rising edge of the clock pulse.
Outputs each bit sequentially in series. This output data is sent to the interchangeable lens (
5) are sequentially taken into the shift register (SR3),
It is output to the terminals (Lad) to (La4) (Fig. 4 (Lad) to (La4)). and terminal (TL5)
At the timing when becomes “High”, the terminal (L
a4), (:La3) output becomes “l O”,
The output of the AND circuit (AN5) becomes "High'",
Flip 70 tube (F3) that receives this output to D input
The Q output of becomes 'High''' (FIG. 4, F3Q).

Decoder (DEC2) terminal (TL7) on the lens (5) side
) rises, the shift register (SR3
The data at the output terminals (La4) to (Lad) of the
The address "o o o o o" of M (51) is specified. As a result of this address specification, the data of the aforementioned check code "11100" is output from the ROM (51).

The above data from this ROM (51) is transferred to the terminal (TL7).
) is latched into the shift register (SR4) at the rising edge of the signal.

Since the Q output of the flip-flop (F3) is high at the time of the timing pulse (TL5), when the next timing pulse (TLO) rises to high, the flip-flop (F4) will flip 70.
Take in the Q output of Tsubu (F3) and set the Q output to High
'' (Fig. 4 F4Q). As a result, the switch circuit (G, S) becomes conductive and the above data ``11100'' is set.
becomes ready to be output to terminal (e).

The data taken into the shift register (SR4) is output in the order of "11100" to the terminal (e) via the switch circuit (GS) in synchronization with the clock pulse, and on the camera body (1) side, it is output at the falling edge of the clock pulse. This data is taken into the shift register (SR2) in synchronization with the fourth shift register (SR2).
Figures BbO-Bb4).

At this time, the clip 70 tube (F5) is the flip
Since the Q output of the flop (F2) is high, the next timing pulse (TBO) is high.
” (TBO rises at S2 step)
, its Q output is 'High'. Therefore,
The gates of the AND circuits (AN3) and (AN4) are open after the S2 step.

Then, at the rising edge of the timing pulse (TBS), the output of the shift register (SR2) is latched into the register (REG2).

In step S2, the above-mentioned data "2100" is taken in, and the next address data "100000" is taken in.
1"' is transferred to the lens (5), and in step S3, the lens data ""000" according to this address specification is transferred.
10" to the camera body, and the next address data "1000010" to the lens (5). Addresses and data are transferred in the same manner.

As shown in Table 1, the upper address of the lens is “I
O'', this is determined by the data output device (50) of the lens (5) and the switch circuit (GS) is turned on, but other accessories such as strobes, lens accessories, motor drives, etc. In this case, as shown in Figure 5, an AND circuit (AN5) is installed corresponding to each accessory.
The input voltage level of the input terminal of is modified. That is, in the case of a strobe, the upper address data is 01''', so when this signal is input, the output of the AND circuit (AN5-1) becomes "'High"', and in the case of a lens accessory, it becomes "'High"'.
l Bi′, so the AND circuit (AN 5-2) is “” Hi
In the case of a motor drive, the circuit is configured so that the output of the AND circuit (AN5-3) becomes 'High''. The circuit configuration is the same.

In the circuit shown in FIG. 3, it is needless to say that the camera body (1) needs to be reset by a power-on reset signal when the power is turned on.

In addition, a power-on reset signal generation circuit is provided inside each accessory, and a power-on recent signal is generated when the accessory is connected to the camera body (1) and power supply starts to the data output device of the accessory. In this way, it is also necessary to reset the circuitry inside the accessory.

In addition, in the case of accessories such as lens accessories, which have only a small number of types of data to be fixedly stored and which are produced in small quantities, the ROM installed inside the accessory may be a programmable ROM or a fuse ROM suitable for small-volume production.
etc. may also be used.

Alternatively, the wiring may be performed using a wiring pattern on a printed circuit board or wiring by soldering.

FIG. 6 shows a part of the address output device (13) that sends address data to the register (REGI) in FIG.
and a register (RE) in the data input device (14).
FIG. 2 is a circuit diagram of a portion that reads data from G2). When the photometric switch (sw3) is closed, the power supply transistor (BTl) becomes conductive, and the capacitor (CI) and resistor (
A reset signal (power-on reset signal FOR) is output from the power-on reset circuit consisting of flip-flops (R41), (R42),
(R43) and the counter (CNT5) are reset. Furthermore, when the photometric switch (SW3) is closed, the output of the inverter (INI) becomes "High", the gate of the AND circuit (AN40) is opened, and the frequency divider (D
A clock pulse (CP) is input to I), and the frequency divider (
DI) outputs a pulse with a constant period obtained by dividing the clock pulse, and a one-shot circuit (O3I) outputs a read opening signal at every constant period. Therefore, in this embodiment, while the photometry switch is closed, the data from the accessory is automatically read periodically. - No need for a switch to detect that the device is attached.

First, the operation of sending address data to the register (REGI) in response to a read start signal will be described. When the read start signal is output, the flip-flop (R40), (
F41) is set and the AND circuit (AN41),
The gate of (AN42) is opened and the counters (CNT6), (CNT7), and (CNT8) are reset. Then, in the (SO) step, (TB
O) timing pulse causes the output of the counter (CNT5) to become "01", and this timing pulse (TBO
), the 7-lip/70-tub (F2O) is reset, and the timing pulse (TBO) is no longer input to the counter (CNT5). As mentioned above, at the rising edge of the timing pulse (TBI), the register (
REGI) latches the outputs of the counter (CNT5) and multiplexer (MP2) as address data, but at this time, the output of the counter (CNT5) is Q I
II, the output of the multiplexer (MP2) is 'ooooo
” Therefore, the address data latched in the register (REGI) is “1000000”, which is the start address of the lens.The output of the counter (CNT5) is latched into the register (REGI) with the front and back of the output bit reversed. R.E.
GI). Here, the multiplexer (M
P2) is the input data (α) to the multiplexer (MP2) when the counter (CNT5) is “O1′′.
When it is "10", (β) is output, and when it is "2", (γ) is output.

At the rising edge of (TB2), the counter (CNT6) counts up by one via the AND circuit (AN42) and becomes 00.
] ". Then, in the next step (Sl), at the rising edge of (TBI), the register (REGI) is set to '
1000001” address data is latched,
At the rising edge of (TB2), the output of the counter (CNT6) is “
010".

Thereafter, the same operation is repeated, and the address data of the lens is sequentially fetched into the register (REGl). Then, in step (S4), at the rising edge of (TBl), the address data of "l OO0100" (
The final address of the lens) is latched in the register (REGI), and when the output of the counter (CNT6) becomes '10t' at the rising edge of (TB2), the AND circuit (AN56)
The output of the one-shot circuit (
A pulse is output from O32). This pulse causes
Flip 70 tube (F4) via OR circuit (OR6)
1) is reset, a flip 70-tub (F40) is set via the OR circuit (OR5), and a 7-lip 70-tub (F42) is further set directly.

In step (S5), the output of the counter (CNT5) becomes "10" at the rising edge of (TBO), and the data of (β) is output from the multiplexer (MP2). Therefore, at the next rising edge of (TBl), register (REG'l)
The address data latched in ) becomes 0100000", which becomes the strobe's first address. Then, the address data latched in (TB
The timing pulse of 2) is sent to the counter (CNT7) via the AND circuit (AN43), and its output becomes '0'.
01'. After that, repeat the same operation (S8)
In the step, at the rising edge of (TBI) '01000
11'' address data (the final address of the strobe) is latched in the register (REGI), and at the next rising edge of (TB2), the most significant output bit of the counter (CNT7) becomes "High" (the output becomes "100"). ), a “High” pulse is output from the one-shot circuit (O33).This pulse resets the clip/70 tube (F42) via the OR circuit (OR7), and The clip flop (F2O) is set, and the 7-lip 70-tub (F43) is directly set.This causes the AND circuit (AN43
) is closed and the AND circuit (AN41), (AN
44) gate is opened.

In step (S9), the output of the counter (CNT5) becomes "tt" at the rising edge of (TBO), data of (γ) is output from the multiplexer (MP2), and at the rising edge of (TBI), the output of the counter (CNT5) becomes "tt". Address data of '100000'' (first address of lens accessory) is latched in the register (REGI). Then, (TB2
At the rising edge of ), the output of the counter (CNT8) becomes "Ol", and in step (S10), the address data of "1100001" is latched into the register (REGI) at the rising edge of (TBI). At the rising edge of CNT8, the upper bit of the counter (CNT8) becomes “High”.
” (output is “10”), one-shot circuit (O
33) outputs a high pulse. This pulse resets the flip 70 tube (F43) and closes the gate of the AND circuit (AN44), which roughly passes the flip through the OR circuit (OR5).・70 whelks (
F2O) is set and the gate of the AND circuit (AN40) is opened. Then, in step (S l l), the counter (CNT5
) changes from "I I" to "00", and at the falling edge of the timing pulse (TBO), the 7 lip-flop (F40) is reset and the AND circuit (AN40)
) gate is closed. With the above operation, the operation of outputting the address data is completed, and a state is entered in which it waits for the next read start signal to be output from the one-shot circuit (O5l).

Next, the operation of reading the data read into the register (REG2) into the registers (REG3) to (REG13) will be described. The counter (CNT9) is reset by the read start signal and counts timing pulses (TB2). And force'>n9 (CNT9) (7
) The outputs are input to the decoder (DEC3), converted into outputs (dO) to (dlo) as shown in Table 4, and output from the decoder (DEC3).

As mentioned above, in steps (SO) and (S1), data from the accessory has not yet been read into the register (REG2) (Fig. 4), so the decoder (D
E, O3) outputs are all u L o, II. Therefore, the gates of the AND circuits (AN45) to (AN55) are closed and the registers (REG3) to (REG1
In 3), no data import operation is performed. In step (S2), the first data is taken into the register (RE G 2) at the rising edge of (TBS). Here, since the terminal (dO) is "High", the gate of the AND circuit (AN45) is open, and the next (TB
6), the data latched in the register (REG2) is latched in the register (REG3).

Similarly, the registers (REG4) to (REG13) are sequentially transferred to the registers (REG4) to (REG13) at the rising edge of the timing pulse (TB6) via the AND circuits (AN46) to (AN55).
The data from REG2) is imported. and,
In step (S l 2), the register (RE) is activated by the timing pulse of (TBfi) via the AND circuit (AN55).
When the last data is latched in G13), the read operation is completed, so this AND circuit (AN55)
At the same time, a timing pulse (TB6) from TB6 is sent to the circuit shown in FIG. 3 as a read end signal, and the read operation is completed.

Various data latched in these registers (REG3) to (REG13) and sent from the second accessory are used for exposure control operations and the like.

Figure 7 shows the circuit configuration of the address output device and the data storage device when reading only data from the interchangeable lens, and also the circuit on the camera body (1) side that also reads distance information from the interchangeable lens. It is a diagram. Lens (5)
is installed and the installation switch ('3W) is closed,
After a certain period of time, the delay circuit (DL)
) becomes °'High''. This delay time is set to the time required for the signal pin contact between the lens and the camera body, which will be described later, to stop chattering and become stable.Then, the photometry switch (SW3) is closed and the AND circuit (AN
When the output of 61) becomes 'High', a read start signal is output from the one-shot circuit (O35) via the OR circuit (ORII), and the read operation is started.
When the AND circuit (AN61) becomes "High", the gate of the AND circuit (AN60) is opened, and the clock pulse (cp) is input to the frequency divider (DI), and a constant period pulse is sent to the frequency divider (D- 1) is output. Therefore, similarly to FIG.
), is output via the OR circuit (ORII).

The photometry switch (SW3) is closed and the capacitor (C1
) and a resistor (R1) output a power-on reset signal (FOR), the flip-70 tubes (F2O) and (F51) are reset. The multiplexer (MP3) inputs data from (X) when the input to the (SE) terminal is “Low”.
When IH1ghH, the data from (Y) is output, so when the photometry switch (SW3) is closed and the reading operation starts, the Q output of the D flip-flop (F50) is output. is “Low”, (
The data from X) is output. In the (SO) step, the Q output of the D flip-flop (F2) of FIG. 3 remains "Low", so the counter (CNTII) remains in the reset state and its output is 000''. Therefore, '1' is output from the multiplexer (MP3).
The data of 000000″′ is output and the register (RE
GI), this data is latched as address data at the rising edge of the timing pulse (TB1). This data is the leading address of the interchangeable lens (5).

When it comes to the (Sl) step, the D7 rib 70 in Figure 3
The Q output of the knob (F2) becomes “High” and the counter (
CNTII) is released from the reset state, and the count is incremented by one with the timing pulse (TBO) to 001.
is output, and the multiplexer (MP3) outputs 1000
001" is output. This data is latched into the register (REGI) at the rising edge of (TBI). (S2)
When the step is reached, the output of the counter (CNTII) is “
010'', and as shown in Table 5, the decoder (DEC5
) output terminal (eO) becomes l Higl, II. Note that Table 5 shows the input/output relationship of the decoder (DEC5) that decodes the count contents of the counter (CNTII).

Then, at the rising edge of (TBI), the register (REGl) is
The data "1000010" is latched as an address. On the other hand, the first data "11100" (check code) is input to the register (REG2) (Fig. 3), and the timing pulse of (TB6) is input to the AND circuit (A
N63), and this data is output from the register (REG
l5). (S3) In step (S3), (TB
At the rising edge of O), the output of the counter (CNTII) becomes “01”.
[", and the terminal (el) of the decoder (DEC5) is "
"High" and the gate of the AND circuit (AN64) is opened.Then, the rise of (TBI) is L and 9.
(REGl) Nih "1000011" is latched as address data, and at the rising edge of (TB6), the data of the open aperture value (A vo) is latched into the register (REGl6) via the register (REG2).

In step (S4), the output of the counter (CNTII) becomes "100" at the rising edge of (TBO), and '10001' is stored in the register (REGI) at the rising edge of (TBI).
0" data is latched as address data. Then, at the timing of the rising edge of (TB2), the Q output of the D clip flop (F50) becomes "High", and the multiplexer (MP3) thereafter uses the data of (Y). will now be output.

This (Y) data indicates the amount of extension of the interchangeable lens (5), and the amount of extension is detected on the camera body (1) side by a mechanism described later. Here, taking advantage of the fact that the relationship between the amount of extension of each interchangeable lens (5) and the distance at which the focus has been adjusted is constant for each interchangeable lens, the ROM of each interchangeable lens (5) contains a table. As shown in FIG. 1, distance data is fixedly stored in correspondence with the above-mentioned feed-out amount data. Therefore, if the data of the extension amount detected on the camera body (1) side is specified as the address of the ROM (51) in the interchangeable lens (5), the distance data stored at that address will be The data is taken into the camera body (1) and distance data can be obtained.

Reference numeral (55) denotes a member provided on the side of the interchangeable lens (5), which moves in the left-right direction in the figure in conjunction with a focus adjustment member (not shown, for example, a distance ring) of the interchangeable lens (5). (70) is provided on the camera body (1) side, and the member (55) has a spring (
The member (55) is brought into contact with the spring force of the member (71).
It moves left and right as it moves. This camera body (
1) side member (70) includes guide pins (72) and (73).
) and a brush (74) as an electrical contact.
, (75), (76), (77), and (78) are provided, and all the contacts are electrically connected. (80) is a code board, the blacked out part is the electrode, and the electrode (80) is the code board.
1) is connected to ground, (82), (83), (84
) and (85) are each connected to the power supply (10E) via a resistor.

Contacts (74), (75) provided on the member (70),
For example, when (76), (77), and (78) are in the position (g), the outputs of terminals (f3) to (fO) are '00
01” and the multiplexer output is 1010001
''. Therefore, the attached interchangeable lens is 50 in Table 1.
+nmF1.4 lens, 4m data ''0
1101" is a 135mm F3.5 lens, it is 1
Data “10110” for 9 m will be output from the interchangeable lens.

Furthermore, when the contacts (74) to (78) come to the position (h), "l O01" is detected through the terminals (f3) to (fO), and "101100" is detected from the multiplexer (MP3).
1" address is output, and if it is 5QmmF1-4, the data of 0.6m "00010" is l 35n++
If nF is 3.5, data of 2.5m"01010" will be output.

In step (S4), the terminal (e) of the decoder (DEC5)
2) is “High”, the timing pulse of (TB6) is output from the AND circuit (AN65), and the minimum aperture data (A vm) is stored in the register (REG l7).
) is latched. In the following step (S5), lens type data is latched into the register (REGI8),
In step (S6), focal length data is stored in the register (
REGI9). In step (S7), the output of the counter (CNTII) becomes "Ill",
The output of the AND circuit (AN62) rises to "High", the flip-flop (F51) is set, the gate of the AND circuit (AN68) is opened, and at the rise of (TB6), the distance data is stored in the register (REG20). is latched, and at the same time (
The pulse of TB6) is sent to the circuit of FIG. 3 as a read end signal.

If the photometry switch (SW3) remains closed even after reading is completed, the one-shot circuit (O3) will close after a certain period.
The next reading start signal is output from I). At this time, the Q output of the flip 70 tube (F2O) and (F51) is “
Since it remains "High", only the data according to the feed amount is output from the multiplexer (MP3) to the register (REGI) in the (SO) step, and the distance data is latched to the register (REG20) in the (S2) step, and the read operation is performed. In other words, when the photometry switch (SW3) continues to be closed, only the distance information is read repeatedly.Therefore, in this embodiment,
Fixed information such as the minimum aperture of an interchangeable lens is read only once, and variable information such as distance information, focal length information of a zoom lens, setting aperture information, etc. is read repeatedly.

In FIG. 3, the shift register for address data output (SRI) and the shift register for accessory data output (SR4) are configured as 7-bit input or 8-bit input shift registers. For example, in the case of 8-bit input, these shift registers read the data input in parallel at the rising edge of timing (TB7) and (TL7), and then read the data input in parallel at the rising edge of timing (TB7) and (TL7).
) to (TB7) and (TLO) to (TL7), the data is sequentially output from the most significant bit to the output terminal (O
output in series to UT). A shift register that performs such an operation has the following circuit configuration. First, eight clip-flops are provided for each bit, to which data of each bit input in parallel is preset. and,
The output terminal of the flip-flop corresponding to the lower bit is connected to the flip-flop corresponding to the bit immediately above the lower bit.
Connected to the input terminal of the flop. By doing so, the data preset in each flip-flop is sequentially transferred from the lower bits to the upper bits in synchronization with the clock pulse. Furthermore, the output terminal of the clip 70 tube, where the data of the most significant bit among the eight bits is preset,
Connect to the input terminal of another ninth 7-lip flop.

The output terminal of this ninth 7-lip-flop is used as the output terminal of the shift register. By doing this, 9
The 70th flip-flop takes in the output of a flip-flop whose most significant bit data is preset in synchronization with the clock pulse, thereby outputting data with a delay of exactly 1 clock pulse.

Effects As described above, according to the present invention, data input from the accessory is repeated during a period when manual operation is performed to make the camera perform a predetermined operation, and the number of data input to the camera is reduced. Since the information is changed according to the progress of the predetermined operation, the time can be shortened and effective data communication can be performed compared to the case where all data is input all the time. In particular, according to the implementation plan, data consists of fixed data and variable data, and we focused on the fact that once fixed data is input, there is no need to input it thereafter, and when inputting data for the second time, only variable data is input. By inputting information, the time can be further reduced.

(↓%/, 1 turn table (continued) Engraving of the statement (no changes to the contents) table Engraving of the statement (no changes to the contents) 2 ROM content data table table

[Brief explanation of drawings]

Figure 1 is a block diagram showing the principle of the present invention, Figure 2 is a block diagram showing the circuit configuration of the camera body, and Figure 3 is a part of the data input/output section on the camera body and data on the accessory side. A circuit diagram showing the circuit with the output device, Fig. 4 is a time chart showing its operation, and Fig. 5 shows other accessories.
6 is a circuit diagram showing an example of connection to the data input/output section and other parts of the camera body in FIG. 3.
FIG. 7 is a circuit diagram showing another embodiment of FIG. 6. l: Camera body, 2.3.4.5: Accessories a-e
: Terminal section, SW3 : Manual operation member, 14: Data input means, DI, OSI, OR5: Control means, F2O, F5
1: Change means. Applicant Minolta Camera Co., Ltd. Procedural Amendment (Format % Formula % Display of Case No. 318892 of 1985 Name of Invention Person who corrects camera with data communication function Relationship to Case Applicant Address Nakahi-ku, Osaka City Osaka Kokusai Building, 2-3-13 Azuchicho "Change of administrative district on February 13, 1989" Name (607
) Minolta Camera Co., Ltd. 5゜6゜March 31, 1999 (Delivery date: April 25, 1999) Contents of the amendment in the "Detailed description of the invention" column of the specification subject to the amendment

Claims (3)

[Claims] (1) In a camera that is removably attached to an accessory that has the function of outputting multiple types of data in series, data that is electrically connected to the accessory and used to perform data communication with the accessory in series. a communication terminal section, a manual operation member that is manually operated to start a predetermined operation of the camera, and a terminal section that starts in response to the manual operation of the manual operation member and transmits multiple types of data held by the accessory. a data input means for inputting data in series through the camera; a control means for operating the data input means at predetermined time intervals at least during the period when the manual operation member is manually operated; A camera characterized by comprising: a changing means for changing the predetermined operation according to the progress state of the predetermined operation. (2) When the second data input by the control means is performed after the first data input in response to a manual operation on the manual operation member, the changing means converts the data into one of the first input data. The camera according to claim 1, in which only the portion of the camera is changed. (3) The accessory has its own fixed data and variable data, and the command means uses fixed data and variable data when inputting data for the first time, and only variable data when inputting data for the second time. A camera according to claim 2.