JPH01295236A - Interchangeable lens camera - Google Patents

Abstract

PURPOSE:To prevent such trouble that a camera main body reads wrong lens data due to defective loading and the chattering of a terminal part by permitting data exchange between an interchangeable lens and the camera after a prescribed period of time has passed since the interchangeable lens was detected to be loaded onto the camera main body. CONSTITUTION:The title camera is provided with a detecting part SW1 which detects which of loading parts (a)-(e) the interchangeable lens is loaded onto, exchanging means 12-14 serially exchanging data with the interchangeable lens 2 through the terminals of the loading parts (a)-(e), a counting means counting a prescribed time in response to the output of a loading signal from the detecting part SW1, etc. While the counting means counts a prescribed time, or no loading signal is outputted from the loading part (a)-(c), the operation of the exchanging means 12-14 is inhibited, and after the counting means completes its counting for a prescribed time, the operation of the exchanging means 12-12 is permitted. Hence, exchange of wrong data due to the chattering of the terminal pats can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a camera system in which data is exchanged between a camera body and an interchangeable lens.

Conventional technology A camera system was developed in Japanese Patent Application Laid-Open No. 2003-11101 in which a storage device is installed in a sympathetic lens to electrically store various data unique to the lens, and this data is communicated in series from the sympathetic lens to the camera body. No. 54-108628. In this camera system, terminal portions for data communication between the camera body and the interchangeable lens are arranged in an arc shape around the lens mounting opening.

Problems to be Solved by the InventionHowever, this camera system has a structure in which the interchangeable lens is attached to the camera body by rotational operation.
There was an inconvenience in that normal data communication could not be performed unless the communication lens was properly attached to the camera body. or,
Even if the camera is installed correctly, chattering will occur between the terminals of the camera body and the terminals of the interchangeable lens immediately after installation, so if data is exchanged during this chattering period, incorrect data may be exchanged. There was also the inconvenience of

The object of the present invention is to provide a camera stem that does not suffer from the above-mentioned disadvantages.

The present invention provides an interchangeable lens camera with a mounting part to which the interchangeable lens is attached, including a terminal for serial data communication with the interchangeable lens, and a mounting part to which the interchangeable lens is attached. a detection unit that detects whether or not the interchangeable lens is attached and outputs an attachment signal when the interchangeable lens is attached; a communication unit that performs serial communication of data with the interchangeable lens via the terminal of the attachment unit; and the detection unit A timer for measuring a predetermined time in response to the output of a mounting signal from the mounting section, and a period during which the clocking means measures the predetermined time or a period during which no mounting signal is output from the mounting portion is the communication means described in 1. It is characterized by comprising a control means for prohibiting the operation of the communication means and for permitting the operation of the communication means after the clocking means or the communication means has finished counting the predetermined time.

Here, the above-mentioned predetermined time is determined, for example, as the time required for the chattering that occurs between the terminal portion of the interchangeable lens and the terminal of the camera body to subside when the interchangeable lens is attached to the camera body.

According to the above configuration, it is detected that the interchangeable lens has been properly attached, and the timing means starts counting a predetermined time, and data communication with the interchangeable lens starts only after the timing is finished. is allowed.

Embodiment FIG. 1 is a block diagram showing the entire photographic system using the present invention. (1) is a camera body, inside which outputs address data for accessories attached to or connected to the camera body, and outputs address data for accessories attached or connected to the camera body.
A central control circuit (]O) is provided which inputs data from the.

(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 for flash photography → nolly (stroboscopic light), and inside this is provided a data output device (30) for outputting data specific to the robot. (4)
is a lens accessory such as an intermediate ring or a hollow ring, and a data output device (40) for outputting data specific to the lens accessory is provided inside the lens accessory. (5)
is an interchangeable lens, and a data output device (50) for outputting data specific to the interchangeable lens is provided inside the interchangeable lens. Camera body (1) and accessories (2), (3)
, (4) and accessories (4) and (5) are electrically connected by terminals (a) to (f), respectively. Here, as described later, terminals (a), (
1]), (C), and (d) from the camera body (1) to the data output device of each accessory, respectively. Power, reference clock pulse, address data, reset, /1
, a signal is supplied. Further, data unique 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 the 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). (SWI) 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 metering switch for starting photometry operation. For example, when the release button is pressed,
The photometric switch (SW3) is closed in the second stage, and the release switch (SW2) is closed in the second stage. The photometric switch (SW3) 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 a switch (SW
Based on the closing signals of I), (SW2), and (SW3), a timing signal is given to the address output device (13) and the data input device (14) to control the timing of address data output and data capture, respectively. Then we both
A reference clock pulse is supplied to the terminal (b) and a reset signal is supplied to the terminal (d). The address output device (13) is controlled by the timing circuit (12) and serially outputs address data every 1 hit from the terminal (C). The data input device (14) reads each accessory-specific data that is serially input one hit at a time from the terminal (e), converts it into parallel data, and sends it to the arithmetic circuit (15).
Send to. The arithmetic circuit (5) calculates data for exposure control, etc. based on the above data, and sends the data to the aperture control device (16), the aperture control device (17), and the 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 top two h (a6) and (a5) of address data are data indicating whether to select an accessory with, that is, a ROM with, and if the selected accessory is an interchangeable lens. "O", "01" for strobes, and "11'" for lens accessories.Also, if it is not shown in Table 1 or is a motor drive, "o"
o”.

The lower five addresses h(a4) to (aO) of the address data are R
This specifies the address of OM. Next, input data when various accessories are attached will be explained based on Table 11 and Table 2. Focal length 50mm, open aperture F1
．． 4. A case will be explained in which, in addition to the minimum aperture value FI6, a lens capable of outputting distance information corresponding to the amount of lens protrusion is attached.

First, as mentioned above, the data unique to the lens is output from the lens by the top two h (a6) of the address data.
), (a5) is 10''.

Bottom 5 hino (・(a4) -(aO)?” o o o
o o", the interchangeable lens outputs the data of the check code F "I I I 00" indicating that the lens is attached to the camera body (1). Therefore, the camera body outputs the address " lOO00
If you specify "00", the data of "!"+1100" will be input to the camera body (1) to confirm whether an interchangeable lens is attached. Similarly, as shown in Table 1, "0100000" will be input to the camera body (1). "When specifying" l l
If the data of "lOO" is input to the camera body, it means that a strobe is attached, and the data is 1100000.
When specifying , if the data "11100" is input to the camera body, it means that the lens accessory is attached.

Next, when the address ``l 00000]'' is specified, it means that either the open aperture Avo data or the address of the stored ROM is specified, and the data ``00010'' for Fl, 4 is sent to the camera body. Next'
When the address of ``1000010'' is specified, the minimum aperture Avmax, for example, is the data ``01111'' of Fl6. This data corresponds to Fl6 as shown in Table 2. If the address of ``1000011'' is When specified, a signal indicating whether the lens is attached or a lens configured to output distance information is output.For example, 50mmF1 in Table 1
．． In the case of lens 4, it is a lens that outputs distance information, so o
o o o o” data is output, while 28 m
In the case of an mF2 lens, distance information is not output, so data of "00001" is output.

Next, when the address "1000100"' is specified,
This means that the address of the ROM where focal length data is recorded is specified, and since the focal length is 50 mm in the case of a 50 mm Fl, 4 lens, the data ``00110'' does not indicate that the focal length is within the range of 40 to 60 mm. ” is output. Also, it is used as lens protrusion amount data or lens ROM address data, which will be described later.
The distance information is output based on this address data. If the feed amount data is “I 0000”,
When the address ``1010000'' is specified, the data corresponding to the distance ■ ``] l l ] I'' is output, and the output amount data ``11111'' is output when the address ``l 011111'' is specified, and the distance 1.
Data ``00111'' corresponding to 41 is output.

Next, if a strobe is attached, as with the lens, when the address "0100000" is specified, the check code "l l I 00" is entered into the camera body to confirm that the strobe is attached. is confirmed. Next, the address "0100001" is specified. The minimum kite number data is stored in this address, and for example, the data "00010" for guide number 14 is output. Next, “0100
When the address 010'' is specified, the data of the maximum kite number is stored in this address, and for example, the data "10010'" for the tunoid number 28 is output.Next, the data of "0100011" is output. When an address is specified, the data of the light distribution characteristics is stored in 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.
It shows that.

If a lens accessory is attached, “1100
When the address 000'' is specified, the check code 11100''' is entered into the camera body, confirming that the lens accessory is attached, and
When the address “001” is specified, “00011” is specified.
"If the data is input, it is confirmed that the teleconverter is installed.As shown in Table 2, if the data is "OOO01", it is ``Heroze'', and the data is ``0''.
0010” is a reverse adapter, 00100
” This confirms that the intermediate ring has been installed.

If there is no example shown in Table 1, or if a Wineter (motor drive) is installed, the Wineter will be in the top two hits (B6
), (B5) or "o o", enter the wineter-specific data into the camera body.

And, like other accessories→Nolly,” o o
o.

If you specify the address "o o o", the check code "l l l 00" will be entered into the camera body,
When the address ``0000001'' 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''.

If it is "01100" then it is 7 seconds per frame, and if it is "01100" it is 7 frames/second.

Figure 3 shows the address output device (1) on the camera body (1) side.
3) is a circuit diagram showing a specific example of a partial circuit of the data input device (14) and a 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 (OS C) is also sent to the lens (5) via the terminal (b). (CNTI) is a counter that counts clock pulses (cp), and (DE
Cl) is the output (CBO) of the counter (CNTI), (C
This is a decoder that decodes the data of B1) and (CB2), and the output of this decoder is (TBO) to (B2) in Figure 4.
The timing signal is shown in TB7). In addition, the counter (CNT2) and decoder (DEC2) provided on the lens (5) side are replaced by the counter (CNT2) on the camera body (1) side.
NT l) and decoder (DECI) have the same configuration, and the output of this decoder (DEC2) is (TLO) to (
The timing signal is shown in TL7).

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 NT I) (CNT2) is decoded, the same timing signal is output and the camera body (1)
The circuits on the lens (5) side and the lens (5) side are synchronized. Table 3 shows counters (CNT1), (CNT2) and decoders (DE
The relationship between the outputs of Cl) and (DEC2) will be shown below.

When the camera body outputs a reading start signal, the flip
The flop (Fl) is sent (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 "o o o", the ant circuit (AN2) of the decoder (DECI) and (DEC2)
, (AN6) is 'High', the AND circuits (AN2) and (AN6) output the counter (
CNT1) and (CNT2) start counting, and then the timing signal (TB
O), (TLO) are output.

First, in step (SO) in Figure 4 (from when the read start signal is output until the first timing signal (TB7) is output), the register is set at the timing when (TBI) rises to "Higb". Address data “l 000000” is latched in (REGI), and further (T
The timing signal of B7) is output and the AND circuit (
This data is latched into the /ft register (SRI) at the timing when the output of ANll) falls to ``Low''. During this step (SO), the flip
Q output of 70 knobs (F2) (Fig. 4 F2Q) or °L0w
Since it is I+, other circuits do not operate. (SO) to (3
When moving to step 1), that is, when the 9th clock pulse (cp) is counted, the counter (CNT
When the output (C84) of I) rises to "High" (CB3 in Figure 4), the D input of the 7 lip-flop (F2) is taken in, and its Q output becomes "High" (Figure 4).
Figure F2Q). As a result, the gate of the AND circuit (ANI) is opened and a clock pulse is supplied to the shift register, and at the same time, the circuit on the lens (5) side is released from the ON state via the terminal (cl). The shift register (SRI) serially outputs the latched address data "1000000"' bit by bit from the terminal (C) in synchronization with the rising edge of the clock pulse. This output data is sequentially taken into the shift register (SR3) on the interchangeable lens (5) side in synchronization with the falling edge of the tarok pulse, and is output to the terminals (Lad) to (La4) (Fig. 4). (Lad)-(La4)). And at the timing when the terminal (TL5) becomes "High",
The outputs of terminals (La4) and (La3) become "l O", and the output of the AND circuit (AN5) becomes 'High'.
The Q output of the clip-on amplifier (F3) which receives this output at the D input becomes 'High'' (Fig. 4 F).
3Q).

Decoder (DEC2) terminal (TL7) on the lens (5) side
) rises, the /ft register (SR3)
The data at the output terminals (La4)-(Lad) of the address data is the lower five bits of the address data ('00000'' in the case of the Sl step), and the data of the ROM (5
1) address "ooooo" is specified. As a result of this address designation, the ROM (51) outputs the data of the aforementioned check codes ``1'' and 1oo''.

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

Since the Q output of the flip clip (F3) is 'High' at the time of the timing pulse (TL5), the next timing pulse (TLO) is 'High'.
When it stands at "h", the 7-resop flow knob (F4) takes in the Q output of the flip 70 knob (F3) and sets the Q output to 'High' (Fig. 4 F4Q).As a result, , the switch circuit (CS) conducts and the above data "1"
1100'' can be output to the terminal (e).

The data taken into the shift register (SR4) is output in the order of '11100' to the terminal Ce') 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 (BbO to Bb4 in FIG. 4).

At this time, the clip clip (F5)
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 launched into the register (REG2).

In step S2, the above data "I l ] O
0'' and transfers the next address data ``'l OO0001'' to the lens (5), and in step S3, the lens data ``00010'' with this address specification is transferred to the camera body. At the same time, the next address data "1000010" is transferred to the lens (5), and the addresses and data are transferred in the same manner.

As shown in Table 1, the first address of the lens is “I
O'', so check whether this is determined by the data output device (50) of the lens (5) and the switch circuit (GS) is turned on, or if other accessories such as strobes, lens accessories, motor drives, etc. As shown in Figure 5, an AND circuit (AN5) is connected to each accessory.
) is transformed. That is, in the case of stopo, the upper address data is "Q I", so when the lever signal is input, the AND circuit (AN5-1)
The output of is “f (i gh”), and in the case of lens accessories it is “I l”, so it is an AND circuit (AN5~
2) "High" for motor drive
o o “Is this the output of the Ant circuit (AN5-3)?”
The other circuit configurations of these accessories are the same as the internal circuit configuration of the lens (5).

In the circuit shown in FIG. 3, it is of course necessary to reset the camera body (1) using a power-on recent signal when the power is turned on.

In addition, a power-on reset signal generation circuit is installed inside each accessory, and a power-on reset 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. It is also necessary to reset the circuitry inside the accessory in this way.

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 them is a programmable ROM suitable for small-volume production, or Hikosu RO.
M etc. may also be used.

Also, it can be used for printed circuit board wiring patterns and hunter attachments.
＝ You may also do this by wiring, etc.

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 (BTI) becomes conductive, and the capacitor (C1) and resistor (R
A reset signal (power-on reset signal FOR) is output from the power-on reset circuit consisting of 1) and flip-flips (R41), (R42), (
R43) and the counter (CNT5) are reset.

Also, when the photometry 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 (
A tarock pulse (cp) is input to the clock pulse (DI), the frequency divider (DI) outputs a pulse with a fixed period obtained by dividing the clock pulse, and a read start signal is output from the one-shot circuit (O3I) at a fixed period. is output. Therefore,
In this embodiment, while the photometry switch is closed, the data from the accessory is automatically read periodically, so if an accessory like the switch (Sl) in Fig. 2 is attached. There is no need for a switch to detect this.

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), (
R41) is set and the AND circuit (AN41), (A
The gate of the counter (CN42) is opened and the counter (CN42) is opened.
T6), (CNT7), and (CNT8) are reset. Then, in the (SO) step, the output of the counter (CN T 5 ) becomes "OM" at the timing pulse (TBO), and the flip-flop (R40) is set at the falling edge of this timing pulse (TBO). , thereafter, the counter (CNT5) receives a timing pulse (T
BO) will no longer be input. Then, as mentioned above, at the rising edge of the timing pulse (TBI), the register (REG) is
I) is a counter (CNT5) and a multiplexer (MP
Either the output of 2) is latched as address data, or in this case, the output of the counter (CNT5) is "OI".
, the output of the multiplexer (MP2) is “'ooooo”
Therefore, the address data latched in the register (REGl) is "l 000000", which is the leading address of the lens. Note that the output of the counter (CNT5) is stored in the register (R
EGI). Here, the multiplexer (
MP2) inputs the input data (α) to the multiplexer (MP2) when the counter (CNT5) is '01'.
When it is "10", (β) is output, and when it is "11", (γ) is output.

At the rising edge of (TB2), the counter (CNT6) counts up by one via the circuit (AN42) from 771.
In the next step (Sl), the address data '1000001' is launched into the registers (RE, GI) at the rising edge of (TBI), and the address data '1000001' is launched at the rising edge of (TB2). ) will be output as '010'.

Thereafter, the same operation is repeated, and lens address data is sequentially loaded into the register (REGl). Then, in step (S4), the address data of "l O00100" (
The final address of the lens) is latched in the register (REGI), and when the output of the counter (CNT6) reaches "101" at the rising edge of (TB2), the AND circuit (AN56)
”) (rises to “high” and makes a single sound)
- A pulse is output from the circuit (OS2). This pulse sets the flip-flop (F41) through the OR circuit (OR6), sets the flip-flop (F40) through the OR circuit (OR5), and sets the flip-flop (F42). is 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 rising edge of the next (TBI) register (REG)
The address data that is loaded into I) is "010000"
0'', which becomes the strobe's first address. Then, the timing pulse of (TB2) or the AND circuit (AN4
3) to the counter (CNT7), and its output becomes "OOl". Thereafter, the same operation is repeated, and in step (S8), the address data '0100011' (the final address of the strobe) is latched into the register (REGI) at the rising edge of (TBI), and the next rising edge of (TB2). Then, when the highest output hit of the counter (CNT7) becomes 'Higl+' (the output is '10
0”), one-shot circuit (OS3) to “High”
” pulse is output. This pulse causes the flip-flop (F42) to be switched to 7/1 via the OR circuit (OR7), and the flip-flop via the OR circuit (OR5).
70 Tzu (F2O) is sent, and a flip-flop (F1a) is set directly. by this,
The gate of the AND circuit (AN43) is closed, and the gates -2, 1- of the AND circuits (AN41) and (AN44) are opened.

In step (S9), the output of the counter (CNT5) becomes '11' 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 '11'. "1100000"
address data (the first address of the lens accessory) is latched into the register (REGI). And (T
B2) rises and the output of the counter (CNT8) is '01
”, and in the (S I O) step, (TBI
), the address data of "l l O0001" is latched into the register (REGI). and,(
When the upper hit of the counter (CNT8) becomes 'High' at the rising edge of TB2) (output is '10'), a 'High' pulse is output from the one-shot circuit (053).This pulse causes the flip 70 pumps (F
1a) The gate of the AND circuit (AN44) is closed, and the flip-flop (F2O) is set via the OR circuit (OR5), and the gate of the AND circuit (AN44) is closed.
AN40) gate is opened. Then step (S
In l1), the output of the counter (CNT5) changes from "l l" to 'oo' at the timing pulse (TBO), and at the falling edge of the timing pulse (TBO), the counter (CNT5) output changes from "l l" to 'oo'.
The lip flop (R40) is set and the gate of the AND circuit (AN40) is closed. With the above operation, the operation of outputting the address data is completed, and the state waits for the next read start signal to be output from the one-shot circuit (○S1).

Next, the operation of reading the data read into the register "(REG2) into the registers (REG3) to (REG13) will be explained. The counter (CNT9) is reset by the read start signal and counts the timing pulse (TB2). .Then, the output of the counter (CNT9) is
It is input to the decoder (DEC3) and converted into outputs (dO) to (dlO) as shown in Table 4.
C3).

As mentioned above, in steps (SO) and (Sl),
Since data from the accessory has not yet been read into the register (REG2) (Figure 4), the decoder (D
All outputs of EC3) are "Low".

Therefore, the gates of AND circuits (AN45) to (AN55) are closed and registers (REG3) to (REG]3)
No data import operation is performed. In step (S2), the first data is taken into the register (REG2) at the rising edge of (TBS). Here, the terminal (dO)
is “High”, an AND circuit (A
N45) is opened, and the data latched in the register (REG2) is latched in the register (REG3) at the next rising edge of (TBG).

Similarly, the registers (REG4) to (REG13) are sequentially transferred to the registers (REG4) to (REG13) at the rising edge of the timing pulse (TBG) via the AND circuits (AN46) to (AN55).
The data from REG2) is imported. and,
(S12) In step S12, the timing pulse of (TBG) via the AND circuit (AN55) causes the register (REGI
When the last data is latched in step 3), it means that the read operation has finished, so the timing pulse (TBG) from this AND circuit (AN55) is simultaneously sent to the circuit in Figure 3 as a read end signal, and the read operation is completed. The operation ends. Latched in this register (REG3) to (REG13)
Various data from the near accessory are used for exposure control operations and the like.

Fig. 7 shows the circuit configuration of the address output device and data input device when reading only data from the interchangeable lens, and is also a circuit diagram of the camera body (1) side in which distance information is also read from the interchangeable lens. It is. Lens (5)
When the is installed and the installation switch (SWI) 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 chattering of the signal bottle contact portion between the lens and the camera body, which will be described later, to subside and become stable. Then, the photometric switch (SW3) is closed and the AND circuit (AN) is connected via the inverter (INS).
When the output of 61) becomes 'High', a read start signal is strongly outputted from the one-shot circuit (O35) via the OR circuit (ORII), and the read operation is started. ) becomes 'High', the gate of the AND circuit (AN60) is opened, and the clock pulse (CP) is input to the frequency divider (DI) and is output from the /Kruska frequency divider (DI) with a constant period. Output. Therefore, similarly to FIG. 6, the knock pulse (
Based on this I/X, a pulse for starting reading is outputted at a constant cycle via a one-shot circuit (○Sl) and an OR circuit (ORII).

The photometry switch (SW3) is closed and the capacitor (C1
) and a resistor (R1)! When the power-on reset signal (P○R) is output from the second power-on reset circuit, the free knob 70 fan (R50), (R5
1) is lysed. Maltiff.

Lexa (MP3) has an input power of 9' to the (S E) terminal.
When it is Low'', the data from (X) is
”, the data from (Y) is output, so when the photometry switch (SW3) is closed and the reading operation starts, the F
The Q output of 50) becomes “I-ow”, and (X
) is output. In the (S O) step, the Q output of the D flip-flop (F2) in FIG. 3 remains 'Low', so the counter (CNT II
) remains in the reset state and its output is “ o o
o”. Therefore, the multiplexer (MP
3) outputs the data 'l 000000', and the register (REGI) receives the timing pulse (TB
At the rising edge of I), this data is latched as address data. This data is the starting address of the interchangeable lens (5).

When the (Sl) step is reached, the Q output of the D clip frump (F2) in Figure 3 becomes "I-I i gb", the reset state of the counter (CNTII) is released, and the timing pulse (TBO) The count is increased by 1 and "001" is output, and the multiplexer (MP3
) outputs "°'1ooooooi". This data is latched into the register (REGI) at the rising edge of (TBI). At step (S2), the counter (C
The output of the decoder (DEC5) becomes '010', and the output terminal (eo) of the decoder (DEC5) becomes 'H' as shown in Table 5.
In addition, Table 5 shows the counter (CNTII)
The input/output relationship of the decoder (DEC5) that decodes the count contents of is shown.

Then, at the rising edge of (TBI), the register (REGl) is
The data of "l00010" is latched as an address.On the other hand, the first data "l1100" (check code) is input to the register (REG2) (Figure 3), and the timing pulse of (TB6) is input. It is output from the AND circuit (AN63) and this data is latched in the register (REGI5).In step (S3), when (TBO) rises, the output of the counter (CNTII) becomes 011'', and the terminal of the decoder (DEC5) (e
l) becomes “High” and the AND circuit (AN64)
gates will be opened. Then, at the rising edge of (TBI), '1000011' is latched into the register (REGI) as address data, and at the rising edge of (TB6), the data of the open aperture value (A vo) is transferred to the register (REGI6) via the register (REG2). ) is latched.

At step (S4), the output of the counter (CNTII) becomes ``100'' at the rising edge of (TBO), and the output of the counter (CNTII) becomes ``100'''' at the rising edge of (TBI).
The data of "OO100" is latched as address data.Then, at the timing of the rising edge of (TB2), the Q output of the D clip 70 tube (F50) becomes "High", and the multiplexer (MP3) thereafter outputs the data of (Y). Data 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 directly as the address of the ROM (51) in the interchangeable lens (5), the distance data stored at that address will be The data is imported 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) is a kite bin (72), (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),
(76), (77), (78), for example, if the position is 1 or (g), the output of terminals (f3) to (fO) will be "'
0001''', and the output of the multiplexer is "l
01000]". Therefore, if the attached interchangeable lens or the 50mm F1.4 lens in Table 1 is used, the distance is 4m.
If the lens is 135+l1mF3.5, the data ``10110'' for 19m will be output from the interchangeable lens.

Moreover, when the contacts (74) to (78) are placed at the position (h), "1001" is detected through the terminals (f3) to (fO), and "I 0110" is detected from the multiplexer (MP3).
The address of 01" is output, and the data of 5QmmF1.4 is 0.6m, and the data of "00010" is 135mm.
For F3.5, data of 2.5m "01010" will be output.

(S4) In the step, the decoder (DEC5) terminal (O
2) or "High", the timing pulse of (TB6) or the AND circuit (AN65) outputs the minimum aperture data (A vm) to the register (REGI, 7).
). In the following step (S5), lens type data is latched into the register (REGI8),
In step (S6), focal length data or register (
REGI9). (S7) stenbu (
The output of the Maso J counter (CNTII) becomes "Ill", the output of the AND circuit (AN62) rises to "High", the flip 70 amplifier (F51) is turned off, and the AND circuit (AN68) The gate of (TB
6), the distance data is loaded into the register (REG20), and at the same time, the pulse (TB6) from the AND circuit (AN68) is sent to the circuit shown in FIG. 3 as a read end signal.

If the photometric switch (SW3) remains closed even after reading is completed, the one-shot circuit (O3) will close after a certain period.
1,) outputs the next reading start signal. These days,
Since the Q outputs of the flip-flops (F2O) and (F51) remain 'High', only the data according to the payout amount is output from the multiplexer (MP3) to the register (REGI) in the (SO) step, and in the (S2) step The distance data is latched in the register (REG20) and the reading operation ends.In other words, the photometry switch (SW3)
is configured to repeatedly read only the distance information when it continues to be closed. Therefore, in the case of this embodiment, fixed information such as the minimum aperture of the interchangeable lens is read only once, and variable information such as distance information (other examples include focal length information and setting aperture information of a zoom lens) is read repeatedly. It is now possible to

In addition, in FIG. 3, shift 1 to address data output
Register (SRI) and Accessory - 771-Register (SR4) for data output has 7 hit inputs or 8
It is configured as a shift register for hint input. For example, in the case of 8-hit input, these shift registers read the data input in parallel at the rising edge of timing (TB7) and (TL7), and then read the data that is input in parallel at the rising edge of timing (TB7) and (TL7).
At the rising edge of BO) to (TB7) and (TLO) to (TL7), data is serially outputted to the output terminal (OUT) starting from the data of the highest hint. A foot register that performs such an operation has the following circuit configuration. First, eight flip-flops are provided for each bit, to which the data of each hint input in parallel is preset. The output terminal of the flip-flop corresponding to the lower bit is connected to the input terminal of the flip-flop corresponding to the hit immediately above the lower bit. By doing so, the data preset in each flip-flop is sequentially transferred from the lower hit to the upper hint in synchronization with the clock pulse. Furthermore, the output terminal of the flip-flop to which data of the most significant hit among the eight is preset is connected to the input terminal of another ninth flip-flop.

The output terminal of this ninth 7-lip bronze is designated as the output terminal of the amplifier resistor. By doing this, 9
The th flip front is a flip front in which the data of the most significant hit is preset in synchronization with the clock pulse.
By taking in the output of the flop, data is output with a delay of exactly one clock pulse.

Effects As described above, according to the present invention, after a predetermined period of time has passed since attachment of the interchangeable lens to the camera body is detected,
Since data communication with the interchangeable lens is permitted, it is possible to prevent the inconvenience of incorrect lens data being read into the camera body due to poor mounting or chatter at the terminal, and normal lens data can be read.

=39- Engraving of the statement (no changes to the contents) Engraving of the statement (no changes to the contents) Engraving of the statement (no changes to the contents) Table 2 ROM content data table Engraving of the statement (no changes to the contents) Table 2 (continued) Engraving of the statement (no changes to the contents) Table 3 Table 4 Table 5

[Brief explanation of the drawing]

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. Figure 4 is a circuit diagram showing the circuit with the output device, Figure 4 is a time chart diagram showing its operation, Figure 5 is a circuit connection diagram showing an example of connection to other accessories, Figure 6 is a diagram of the camera body side of Figure 3. A circuit diagram showing the circuit of other parts of the data input/output section,
FIG. 7 is a circuit diagram showing another embodiment of FIG. 6. 1: Camera body, 2: Interchangeable lens, a-e: Mounting part, S
WI: detection unit, 12, 13, 14: communication means, DL
Timekeeping means, AN61: Control means. Applicant Minolta Camera Co., Ltd. Procedural Amendment (Method) 1. Description of the case 1986 Patent Application No. 318896 2 Name of the invention Interchangeable lens camera 3 Person making the amendment Relationship to the case Applicant address 2-3-13 Azuchi-cho, Chuo-ku, Osaka City Osaka Kokusai Building “Heisei “Change of administrative division on February 13, 1999” March 3, 1999
1st (Delivery date: April 25, 1999) 5. Column 6 of "Detailed description of the invention" of the specification to be amended, Contents of the amendment

Claims (1)

[Claims] (1) In a camera that is removably attached to an interchangeable lens that has the function of communicating data with the camera body,
A mounting section on which an interchangeable lens is mounted, which includes a terminal for serial data communication with the interchangeable lens to be mounted, and a mounting section that detects whether or not an interchangeable lens is mounted on the mounting section and generates a mounting signal when the interchangeable lens is mounted. a detection unit that outputs a signal, a communication unit that serially communicates data between the interchangeable lens via the terminal of the mounting unit, and a communication unit that measures a predetermined time in response to the output of the mounting signal from the detection unit. A timekeeping means, and a period during which the timekeeping means measures the predetermined time or a period when no attachment signal is output from the attachment part, prohibits the operation of the communication means, and the timekeeping means finishes counting the predetermined time. An interchangeable lens camera comprising: a control means for later permitting operation of the communication means.