JPH0627893B2 - Automatic focus adjustment device - Google Patents

Description

Detailed Description of the Invention

 TECHNICAL FIELD The present invention relates to a subject within a relatively narrow predetermined area of a captured image.
Determine the focusing lens position to focus on
Then, once it is decided, the lens position should be fixed.
The present invention relates to an automatic focusing device. Conventional technology Conventionally, automatically for subjects within a relatively narrow predetermined area
In the thing that adjusts the focus, once focus is achieved,
Automatic focus adjustment device that prohibits focus adjustment
Yot AF) has been proposed. According to this device,
The focus state is fixed when the subject is in focus.
The focus position does not shift even if you adjust the area to another subject. Shi
Therefore, change the composition while focusing on the main subject.
It is possible to shoot. DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, when determining a composition, an object other than the main subject is determined.
Whether the subject (sub-subject) is within the depth of field
That is an important requirement. However, the above conventional
With this device, the focus state of the sub-subject cannot be confirmed, and the main subject
Focusing the sub-subject to determine the composition after focusing on the subject
There was a problem that it could not be done in consideration. Therefore, the present invention is a sub-camera when the main subject is in focus.
You can check whether the subject is within the depth of field
It is an object of the present invention to provide an automatic focus adjusting device. Means for Solving the Problems In order to solve the above problems, the present invention provides a focus on a subject within a relatively narrow predetermined area of a captured image.
Detecting means for detecting data relating to the adjustment, and focusing on the subject based on the output of the detecting means.
Position the focusing lens so that
In response to the completion of the operation of the lens position determining means
A focus lock for prohibiting the operation of the lens position determining means.
Lock means and the focus lock means during operation, the detection means
Based on the output and aperture value, the subject within the above-mentioned predetermined area is covered.
Determine whether it is within the depth of field and the determination result
And display means for displaying. Focus on the subject within the specified area to obtain focus.
Once the position of the focusing lens is determined,
Focusing lens position is maintained and the above predetermined area
A display showing whether the subject is within the depth of field
Done. Embodiment An outline of an automatic focusing camera system according to the present invention will be described with reference to
First example showing use in a replaceable single-lens reflex camera
It will be described with reference to the drawings. In Fig. 1, left side of the alternate long and short dash line
Is a zoom lens as an example of a taking lens (LE), right
The side is the camera body (BD), and both are couplers.
-Mechanically connected via (101) and (102)
It In this camera system, the lens of the taking lens (LE)
Focus lens (FL), zoom lens (ZL),
Subject light that has passed through the master lens (ML)
Semi-translucent part in the center of the reflection mirror (103) of the main body (BD)
Of the focus reflected by the sub-mirror (104).
The light is received so that it is received by the point detection light receiving unit (FLM).
The academic system is organized. This light receiving part is
Only the amount of light incident on a relatively narrow predetermined area is received. The rotation of the motor (MO) is controlled by the slip mechanism (SLP)
Dynamic mechanism (LDR), camera body side coupler (102)
It is transmitted to the photographic lens (LE) via. Incidentally, slip
The mechanism (SLP) applied more torque than a predetermined amount to the latter stage.
Sometimes slips and the motor (MO) is overloaded
It is to prevent it. Also, of the shooting lens
The focusing lens (FL) is through the transmission mechanism (100).
And is connected to the lens side coupler (101). This
This allows the focus to follow the rotation of the motor (MO).
Lens (FL) moves back and forth along the optical axis for focus adjustment
Is performed. The signal processing circuit (106) includes a focus detection light receiving unit (FL).
M) the imaging position of the focusing object based on the received light output from
For defocus, which indicates the amount of deviation at the in-focus position
｜ and defocus direction (front pin or rear pin)
Data is output periodically. First focus state determination circuit (1
07 is a defocus amount from the signal processing circuit (106)
| ΔL | is compared with the focus width ZN, and
Defocus | ΔL | according to the amount of movement of the lens (FL).
To detect whether or not | ΔL |
Then, for example, if | ΔL | ≦ ZN, a focusing signal is output, and if | ΔL |> ZN, a non-focusing signal is output. The motor drive circuit (MDR) uses this out-of-focus signal and
Based on the signal in the defocus direction, the motor (M
O) drive is controlled to drive the motor (that is, lens movement).
Focus signal is output from the focus state determination circuit (107)
If so, the drive of the motor (MO) is stopped.
Aperture data output circuit (105) is used for capturing aperture data.
Is output. The second focus state determination circuit (108)
Starts operation in response to drive stop, and includes focus when drive stops
Defocus output from the state determination circuit (107)
Output from the aperture data output circuit (105)
The depth of focus data corresponding to the aperture data
It The depth of focus display means (109) is based on this determination result.
Display, that is, the image formation position is within the depth of focus according to the diaphragm.
Is displayed. A brief description of the operation of the camera system having the above configuration
To do. First, when the motor (MO) is stopped,
ΔL |> ZN and the imaging position is outside the focusing area
If it is determined that the first focus state determination circuit (107)
The motor (MO) starts driving by the non-focus signal from
It As a result, the focusing lens (FL) is in focus.
Start moving towards the table. The signal processing circuit (106)
The amount of deviation based on the amount of light received from the light receiving unit (FLM)
Is periodically output to drive the motor (MO).
The image formation position reaches the in-focus area, and | ΔL | ≦ ZN is determined.
Separated, the motor drive circuit (MDR)
-(MO) stops suddenly. As a result, the second focus state determination
Another circuit (108) starts to operate. Now, with the lens movement stopped in this way, focus
If the direction of the camera is changed to the desired part of the subject other than the target book
Then, from the signal processing circuit (106) to the desired portion
Defocus amount and direction data for
It At this time, the motor (MO) is not driven. This
Here, the second focus state determination circuit (108)
According to the iris for photography given from the digital output circuit (105)
The focal depth data of the
Data and defocus amount data for the desired part
Compare with. The depth of focus display circuit (109) is
Depending on the comparison result, the image formation position of the desired part can be adjusted to the shooting diaphragm.
It is displayed whether it is within the same depth of focus. This depth of focus
To determine and display the direction of the camera
Every time you turn to. Component of the automatic focusing camera system of the present invention having the above configuration
The physical contents will be described below in detail according to the drawings starting from FIG.
It In addition, the signal processing circuit of FIG. 1, the first and second focusing
The functions of the status determination circuit and the depth of focus display circuit are
Achieved by computer (hereinafter referred to as microcomputer)
It FIG. 2 shows the camera body (B
It is a block diagram which shows the structure of the circuit part of the D) side. In the figure
Between the camera body (BD) and the lens (LE)
For example, the focal length of the lens (LE) is 1.4 times or 2 times
A converter (CV) for extending the cable is inserted.
The camera body (BD) and converter (CV) are respectively
Connected by connecting terminal group (CN 1) and (CN 2),
Verta (CV) and lens (LE) are connected to each other
The child groups (CN 3) and (CN 4) are connected and
Various information from the barter (CV) and lens (LE)
It is designed to be given to the camera body (BD) side.
By closing the power switch (MAS),
-Only set circuit (POR 1), microcomputer (MC
1), (MC 2), display control circuit (DSC), oscillator circuit
(OSC), inverters (IN 1) to (IN 8),
Power to the circuit (AN 1) via the power line (+ E)
Be started. Power-on reset by this power supply start
The reset signal (PO 1) is output from the circuit (OR 1)
Microcomputer (MC 1), (MC 2) and display control circuit
Path (DSC) is reset. Microcomputer (MC 2)
The overall operation of this camera system is performed in sequence.
It is a microcomputer to play
 1) responds to the control signal from this microcomputer (MC 2)
Micro-computer for performing focus adjustment operation in sequence
It is a computer. The operation of the microcomputer (MC 2)
The flow chart of Fig. 3 shows the operation of the microcomputer (MC 1).
It is shown in the flow charts of FIGS. 8 to 10. Metering switch (MES) is a release button (not shown)
This switch (ME
S) is closed, the inverter (IN 1) is used to
“High” level on the input terminal (i 0) of the icon (MC 2)
Signal is given. In response to this, the microcomputer (MC
 The terminal (O 0) of 2) becomes “High” and the inverter
Transistor (BT 1) conducts via (IN 2)
It This transistor (BT 1) conducts power
On-resetter circuit (POR 3), photometric circuit (LMC),
Decoder (DEC 1), Transistor for driving light emitting diode
Star (BT 3), film sensitivity setting device (SSE), diaphragm
Threshold setting device (ASE), exposure time setting device (TS
E), exposure control mode setting device (MSE), exposure control device
Power supply line (V) to the latch circuit (LA).
Power supply is started via B). By starting this power supply,
Reset signal from power-on reset circuit (POR 3)
(PO 3) is output and the exposure controller (EXC) resets.
Is set. In addition, the output terminal (O) of the microcomputer (MC 2)
The "High" level signal from 0) is sent to the buffer (B
F) of converter (CV) and lens (LE)
As the power supply voltage (VL), the connection terminal groups (CN 1), (C
Via N 2), (CN 3), (CN 4))
In the circuit (CVC) in the camera (CV) and in the lens (LE)
Provided to the circuit (LEC). The connection terminal group is
In addition to the power supply terminal, the output terminal (O of the microcomputer (MC 2)
 6) Output from converter circuit (CVC), lens
Signal to release the circuit (LEC) from the reset state
Transmission terminal and microcomputer (MC 2) clock output terminal
Synchronous clock pulse from (SCO)
Path (CVC), lens circuit (LEC)
Direct connection of the clock pulse transmission terminal and the microcomputer (MC 2)
The column data input terminal (SDI) has a covert (CV) and
Input terminal for inputting data from LEs
And a ground terminal. In addition, microcomputer (MC
 Figure 2 shows the circuit configuration of the serial data input section in 2).
Circuit (CVC) and lens (LE)
The circuit configuration of the circuit (LEC) is shown in FIG. The photometric circuit (LMC) is an analog of the microcomputer (MC 2)
Reference the analog photometric signal to the input terminal (ANI)
Reference voltage signal for DA conversion to the voltage input terminal (VR)
I'm giving. The microcomputer (MC 2) is a photometric circuit (LM
To the terminal (ANI) based on the reference voltage signal from C).
Converts the input analog photometric signal to a digital signal
It The display control circuit (DSC) connects the data bus (DB)
According to various data input via the liquid crystal display (D
SP) to display the exposure control value and the light emitting diode
Warning display etc. is performed by the mode (LD10) to (LD1n).
U The output terminal (O 8) of the microcomputer (MC 2) is the metering switch.
Exposure control operation of the turtle after the switch (MES) was closed
It is "High" until the start
Due to (IN 8), the transistor (BT 3) is only this question.
Allows light emitting diodes (LD10) to (LD1n) to emit light
It The decoder (DEC 1) is the output port of the microcomputer (MC 2).
A device (M
SE), (TSE), (ASE), (SSE), circuit
(DSC), #LA) device or circuit
And Maiko (MC 2) via data bus (DB)
Output signal that indicates whether to transfer data
It is given to (a 0) to (an + 1). For example, a microcomputer
When (MC 2) reads the data of exposure control mode
Is a specific data from the output port (OP 1)
When (ao) becomes "High", the data bus (D
B) Set exposure from exposure control mode setting device (MSE)
Data indicating the control mode is output, and this data is
Read from input / output port (I / O) of controller (MC 2)
It Similarly, when reading the set aperture value, the terminal (a2)
It becomes "High". Display control circuit (DSC)
When sending data, the terminal (a4) ~
One of (an) becomes "High". In addition,
Input / output port when sending the conversion coefficient data (KD)
(I / O) to data bus (DB)
Specific data to the output port (OP 1) after outputting the data
Is output for a certain period of time and the pulse from the terminal (an + 1)
The latch circuit (LA) latches the conversion coefficient data.
It The exposure control device (EXC) interrupts the microcomputer (MC 2)
If a “High” interrupt signal is given to the signal input terminal (it)
To start the following exposure control operations.
Release circuit, mirror drive circuit, aperture control
It is equipped with a circuit and an exposure time control circuit. This device (EX
C) is output from the output terminal (O 4) of the microcomputer (MC 2).
When the rule is output, it is output to the data bus (DB)
Capture the data of the number of narrowing steps and activate the release circuit.
Then, the exposure control operation is started. Start of exposure control operation
After a certain time has passed from the microcomputer (MC 2)
Output time data is on the data bus (DB), and pulse is the terminal
It is output to (O 5). This allows the exposure control device (E
XC) takes in the exposure time data and creates a mirror drive circuit.
Move the mirror to start rising, and stop the diaphragm.
Operate the control circuit to reduce the aperture by the number of aperture data.
Let it slip in. When the raising of the reflection mirror is completed, the shutter
-The running of the first curtain begins. At the same time, count switch
The exposure time control circuit is created by closing (COS).
Moves and starts counting the time corresponding to the exposure time data
To be done. When the count is complete
By starting, opening the aperture and lowering the mirror
The exposure control operation is completed. Release switch (RLS) is by pressing the relays button.
This switch (RLS) is closed in the second stage
Is closed, the output of the inverter (IN 3),
One input terminal of the switching circuit (AN 1) becomes "High".
The switch (EES) is closed when the exposure control operation is completed.
The exposure control mechanism (not shown) is ready for operation.
When released, it is released. Indicates the open / closed state of this switch
The signal is sent to the microcomputer (MC
2) Input terminal (i 2) and AND circuit (AN 1)
It is given to the other input terminal. In addition, AND circuit (AN 1)
The output end of is the interrupt signal input terminal (i
connected to t). Therefore, the charge of the exposure control mechanism
Is not completed, the AND circuit (AN 1)
The door is closed and the release switch (RLS) is
The output of the AND circuit (AN 1) is "Low" even if it is closed.
There is. That is, the interrupt signal is not sent to the microcomputer (MC 2).
No input is made and the exposure control operation is not started. Meanwhile, exposed
In the body where the charge of the control mechanism is completed, the AND circuit
(AN 1) gate is open, release switch
Output of AND circuit (AN 1) when (RLS) is closed
Becomes "High" and the interrupt signal or the microcomputer (MC 2)
Input to the interrupt terminal (it) and the microcomputer (MC 2) immediately
Move to exposure control operation. Microcomputer (MC 2) output terminals (O 1), (O 2),
(O 3) is the input terminal (i
11), (i 12), and (i 13). here
Then, the output terminal (O 1) is detected by the microcomputer (MC 1).
"High" when you want to get out, you have to do
It becomes "Low". The output terminal (O 2) is the motor
Focus lens when (MO) is rotated clockwise
An interchangeable lens configured to extend (FL)
If installed, turn "High" on the motor (MO)
In the case of an interchangeable lens that is extended by rotating it counterclockwise
When it becomes "Low". The output terminal (O 3) is
Based on the amount of deviation from the in-focus position and the defocus direction
Method to drive the focusing lens toward the in-focus position
(Hereinafter referred to as the predictor method) only
In the case of an interchangeable lens with focus adjustment, "Low",
Signal in the direction of deviation from the focus position (front pin, rear pin, in-focus)
The method of driving the lens by (hereinafter referred to as the three-point pointing method)
With this predictor method.
In the case of the interchangeable lens to be used, it becomes "High". Switch
(FAS) is opened and closed by a manual switching member (not shown).
The focusing lens is moved according to the result of focus detection.
Driven to the in-focus position and automatic focus adjustment is performed
Closed when in mode (hereinafter referred to as AF mode)
Only the in-focus state is displayed according to the in-focus state detection result.
Is performed and focus adjustment is performed manually (hereinafter,
It is opened in the FA mode). This sui
The open / close signal of the switch (FAS) is passed through the inverter (IN 6).
The input terminal (i 1) of the microcomputer (MC 2) and myco
Is applied to the input terminal (i 14) of the input terminal (MC 1). The output terminal (O16) of the microcomputer (MC 1) is an inverter
Via (IN 5) to the base of the transistor (BT 2)
It is connected. Therefore, the terminal (O16) becomes "High".
Then, the transistor (BT 2) becomes conductive and the power is turned on.
Reset circuit (PO 2), light receiving unit for focus detection (FL
M), light receiving part control circuit (COT), motor drive circuit
(MDR), encoder (ENC), light emitting diode drive
Power is supplied to the drive circuit (FAD) through the power line (VF).
Be started. Power-on reset by this power supply start
The reset signal (PO 2) is output from the circuit (POR 2).
Be done. The light emitting diode drive circuit (FAD) is shown in FIG. 6, for example.
The circuit configuration is as shown, and the microcomputer (MC 1)
Output port (OP 0), that is, output terminals (O17), (O
18), (O19) according to the data output
Drives odes (LD 0), (LD 1), (LD 2)
It With this circuit configuration, the output terminal of the microcomputer (MC 1)
Any one terminal of child (O17), (O18), (O19)
Becomes "High", the front pin display LED (L
D 0), Focus display LED (LD 1), Rear pin
One of the display light emitting diodes (LD 2) lights up
To display the front focus, focus, or rear focus. Also,
The two terminals of output terminals (O17) and (O19) are "High".
Then, the clock pulse (C
P) based on light emitting diodes (LD 0), (LD 2)
Flashes at the same time, indicating that focus cannot be detected. Table 1
Indicates the operating state.The light receiving unit (FLM) for focus detection is a plurality of light receiving units for focus detection.
With CCD (Charge Coupled Device)
Has been formed. The control circuit (COT) is a microcomputer (M
Driving of CCD (FLM) based on the signal from C 1),
CCD output A-D conversion and A-D conversion output myco
It has a function of transmitting to the mobile phone (MC 1). From the microcomputer (MC 1) to the control circuit (COT)
The output terminal (O10) to CCD (FLM) integration operation
Is the pulse signal for starting the output terminal (O11)
Pulse signal to forcibly stop this integration operation
Are output respectively. Also, for the microcomputer (MC 1)
Then, from the control circuit (COT), the product of CCD (FLM)
The signal indicating that the minute operation is completed is sent to the interrupt terminal (it).
A of the accumulated charge for each light receiving element of the CCD (FLM)
A signal indicating that the -D conversion operation is completed is input to the input terminal (i
 In 10), the data converted from A to D above is the input port.
(IP 0) respectively. In addition, CCD (FL
A reset signal from the control circuit (COT) for M)
Transfer command signal to terminal (φR), transfer to terminal (φT)
Clock for terminals (φ 1), (φ 2), (φ 3)
The illumination potential is input to each terminal (ANB) and the CCD
From (FLM) to the control circuit (COT), the terminal (A
From NB), the potential according to the amount of light received by the monitor light receiving unit
The accumulated charge in each light receiving part is output from the terminal (AOT).
I will be forced. Specific circuit configuration of this control circuit (COT)
Will be described in detail later with reference to FIG. Here, CCD (FLM), control circuit (COT), my
To briefly explain the operation of the controller (MC 1), the control circuit (CO
T) is from the output terminal (O10) of the microcomputer (MC 1)
Reset to CCD (FLM) in response to the integration start signal
Sending a signal and resetting the CCD (FLM)
Then, a reference potential signal is applied to the CCD (FLM). CC
Accumulation according to the amount of light received at each light receiving unit in D (FLM)
The charge increases, which causes the output from the terminal (ANB).
The applied potential drops. The control circuit (COT)
When the terminal (ANB) level reaches a specified value, the CCD
Output a transfer command signal to (FLM) to CCD (FLM)
Accumulated charge of each light receiving part of the transfer gate in the CCD (FLM)
And the interrupt end of the microcomputer (MC 1)
The integration completion signal is given to the child (it). And the control circuit
(COT) is transferred to the transfer gate of CCD (FLM).
The stored charge is based on the transfer clock of φ 1, φ 2, and φ 3.
Then, the data is received, A-D converted, and stored by one light receiving unit.
Every time the charge A-D conversion is completed, the microcomputer (MC 1)
An A-D conversion completion signal is given to the input terminal (i 10). Ma
The icon (MC 1) is AD converted in response to this signal.
Captured data from the input port (IP 0). That
The microcomputer (MC 1) is the light receiving element of CCD (FLM).
When the data converted from A to D is captured, the CCD output
End the uptake of force. It should be noted that the microcomputer (MC 1) has passed a certain time since the start of integration.
If the interrupt signal is not input even if it passes, CCD integration
The pulse for stopping the operation compulsorily is
Output from the terminal (O11) of C1). Control circuit (CO
T) is a transfer command from the terminal (φT) in response to this pulse.
The signal is given to the CCD and also to the microcomputer (MC 1)
By outputting an interrupt signal, A-D conversion of the CCD output,
Performs data transfer operation. The motor drive circuit (MDR) is the output of the microcomputer (MC 1).
The signals given from the power terminals (O12), (O13), (O14)
The motor (MO) is driven based on the number. In addition, Maiko
Mode (MC1) output terminal (O12) is "High".
The motor (MO) is clockwise and the output terminal (O13) is "H".
When "igh", the motor (MO) is driven counterclockwise.
Monitored when both output terminals (O12) and (O13) are "Low".
The drive of the motor (MO) is stopped. Furthermore, the microcomputer
When the output terminal (O14) of (MC 1) is "High",
(MO) is driven at high speed, and at "Low", it is driven at low speed.
To be done. A specific example of this motor control circuit (MDR) is
Although the applicant of the present application has already proposed it in Japanese Patent Application No. 57-136772,
Since it has nothing to do with the gist of the present invention, its explanation is omitted. The encoder (ENC) is the rotation torque of the motor (MO).
Transmission mechanism on the camera body side (L
MD) drive amount, for example by a photo coupler
And outputs a number of pulses proportional to the driving amount.
This pulse is the clock input terminal of the microcomputer (MC 1)
It is input to (DCL) and is automatically counted.
The actual value ECD is the flow of the microcomputer (MC 1) described later.
It is used to interrupt the counter. Also, this pulse is
To the motor drive circuit (MDR) and respond to the pulse.
Accordingly, the rotation speed of the motor (MO) is controlled. FIG. 3 is a flow chart showing the operation of the microcomputer (MC 2) shown in FIG.
It is a row chart. The operation of the microcomputer (MC 2) is roughly
Crab is roughly divided into the following three flows. Step # 1
The flow starting from is for closing the power switch (MAS)
This is the main flow that starts from
Focus adjustment by closing (MES) (# 2)
Power supply to circuits other than those for power supply (# 4)
Reading the exposure control information set on the camera body (BD)
(# 5), lens (LE), converter (CV)
Data reading (# 6 to # 12), metering value reading (# 1
3 and 14), AF mode, automatic setting of AF mode (# 16 ~
# 27), exposure control value calculation (# 28) and display (# 31,
# 32) and so on are repeated. # Start with step 45
Low is from the timer built in the microcomputer (MC 2)
Metering switch with a periodically output timer signal
Even if the (MES) is opened, it will take a predetermined time (for example, 15 seconds)
A timer interrupt for performing the operation of the main flow
This is the flow of Mino. Also, start from step # 59.
Low is closed by closing the release switch (RLS).
Release interrupt to start exposure control operation of camera
Is the flow. Below, based on FIG. 3 to FIG.
2 related to the microcomputer (MC 2)
The operation of the system will be described in detail. First, when the power switch (MAS) is closed,
From the on-reset circuit (POR 1) to the reset signal (PO
 1) is output. This reset signal (PO 1)
The microcomputer (MC 2) is a reset in the main flow.
The set operation is performed in step # 1. Metering switch (M
ES) is closed, so input in step # 2
When it is found that the terminal (i 0) becomes "High",
Disable the timer interrupt (# 3) and connect the terminal (O 0)
Set to "High" (# 4). This makes the transistor
(BT 1) becomes conductive and power is supplied from the power line (VB).
Be started. At the same time, the power supply is controlled via the buffer (BF).
In (VL) to converter (CV) and interchangeable lens
Power supply to (LE) is started. In step # 5,
Exposure control mode setting device (MSE), exposure time setting device
(TSE), aperture setting device (ASE), film sensitivity
Data from the setting device (SSE) is data bus (DB)
Are sequentially taken into the input / output port (I / O) via the. In steps # 6 to # 12, first register D
"O" is set (# 6) and the terminal (O6) is set to "High".
 Is defined as "converter circuit (CVC), lens circuit"
The reset state of (LEC) is released, and (# 7-1)
The serial input command of the data is output (# 7-2). Convertor
Data circuit (CVC) and lens circuit (LEC)
When the data input is completed (# 8), the data
Data in the register M (A) corresponding to the contents of register A.
(# 9). Next, "1" is added to the contents of register A
Added (# 10), the content became Ac (constant value)
It is determined whether or not. Here, if (A) ≠ Ac, #
Return to step 7-2, and the next data is acquired again.
Be played. When (A) = Ac, the lens (LE) and converter
It means that the data acquisition from (CV) is completed.
Then, set the output terminal (O 6) to “Low” (# 12), and
Reset the barter circuit (CVC) and lens circuit (LEC)
To Here, from the lens (LE) and converter (CV)
Based on Fig.4 and Fig.5
explain. The serial data input section shown in FIG.
Output terminal when inputting 8-bit serial data
(SOC) outputs 8 clock pulses and
Sequential input of serial data at the falling edge of the lock pulse
Read in. That is, according to the serial data input command (SIIN)
The flip-flop (FF 1) is set to 3 bits
The reset state of the binary counter (CO 1)
It will be canceled. At the same time, the gate of the AND circuit (AN 7)
Clock opened and divided in the microcomputer (MC 2)
Output terminal for pulse (DP) as synchronization clock output
From (SCO) to converter (CV) and lens (LE)
It is sent to the circuits (CVC) and (LEC). In addition, this
Loss pulse is counter (CO 1), shift register
(SR 1) clock input terminal. Shift cash register
(SR 1) is the falling edge of clock pulse (DP)
Input to the input terminal (SDI) of the microcomputer (MC2).
The data that is being acquired is sequentially acquired. Where the counter
The carry terminal (CY) of (CO 1) is
The next cross pulse from when the pulse (DP) is input
It becomes "High" until the input of (DP)
It On the other hand, at the one input end of the AND circuit (AN 5)
Carry output is an inverter (IN15) at the other input
Since the clock pulse (DP) is input via
The AND circuit (AN 5) uses the 8th clock pulse (D
At the falling edge of P), it becomes "High", and the flip flow
Reset the counter (FF 1) and counter (CO 1)
Enter the reset state. Therefore, the AND circuit (AN 5)
As for the output, the carry terminal (CY) of the counter (CO 1)
Being "Low" makes it "Low" and prepares for the next operation.
It Pal of "High" from this AND circuit (AN 5)
Serial input flag SIFL is set and data is input.
Is determined, the microcomputer (MC 2) shift register
From the data (SR 1) to the internal data bus (IDB)
Stored data in a predetermined register M (A). In FIG. 5, the converter (C
V) converter circuit (CVC), the lens on the right side
(LE) lens circuit (LEC). Microcomputer (M
When the output terminal (O 6) of C 2) becomes "High"
(CO 3), (CO 5), (CO 7), (CO 9)
The reset state is released and these counters
The clock applied from the output terminal (SCO) of (MC 2)
It is possible to count the pulse rate (DP). Three
Bit-by counter (CO 3), (CO 7)
The rising edge of the clock pulse (DP) of
From the rising edge of the second clock pulse,
Q carry terminal (CY)
Set to "High". 4-bit binary counter (C
O 5) and (CO 9) are the trailing edges of this carry terminal (CY).
Count the bite and the first pulse of 8 clock pulses
Counter (CO 5), (CO 9)
The und value increases by one. ROM (RO 1) of converter circuit (CVC) is
The cash register directly based on the count value of the und (CO 3)
A star is specified. Lens circuit (LEC) ROM (R
O 3) is a value based on the count value of the counter (CO 1).
Via coder (DE 9), data selector (DS 1)
The register is indirectly specified. ROM (RO
1) and (RO 3) output lenses (L
E) and converter (CV) data are stored in the decoder (DE
 Depending on the output of 5), either output will be added again in series.
Output of the sum of the two added by the path (AL 1) or
All the data of "0" is selectively output. Where,
Counter (CO for a lens with a fixed point distance)
 9) Decoder (DE 9) and ROM (RO 3)
Table 2 shows the above for a zoom lens with a variable focal length.
The relationship is shown in Table 3. Also, the counter in the converter
(CR 5), decoder (DE 5), ROM (RO 1)
Table 4 shows the relationship with the output data to the camera body. still,
φ may be either “0” or “1” for each bit data
Indicates. Outputs (b 0) and (b 0) of counters (CO 3) and (CO 7)
1) and (b 2) enter decoders (DE 3) and (DE 7)
Decoders (DE 3) and (DE 7)
The signals shown in Table 5 are output according to the data. Therefore, when the clock pulse rises, the ROM (R
 The data of 3) is 1 bit sequentially from the least significant bit (r 0).
AND circuit (AN20) to (AN27), OR circuit (O
R 5) and output at the same timing to ROM (R
The data of O 1) is also the lowest at each rising edge of the clock pulse.
AND circuit (AN) bit by bit sequentially from bit (e 0).
10) to (AN17), output via the OR circuit (OR 1)
Be done. Also, in the case of a zoom lens, the zoom ring
Depending on the focal length set by (ZR) operation,
The code board (FCD) that outputs the data of
It is provided in the road (LEC). Depending on the set focal length
Data by the output of the code plate (FCD) that changes with
Lower 5 bits of input terminal (α 2) of selector (DS 1)
The value of is uniquely determined. Therefore, the data selector (DS
 In 1), the output (h 4) of the decoder (DE 9) is “Low”.
In the case of, “0 0 0 0 h3 h2 h1 h from the input terminal (α 1)
0 ”data, and when it is“ High ”, input terminal (α
 2) to “h2 h1 h0 ********” (* indicates the code plate
(ROM) by outputting the data
 Specify the address of 3). If the count (CO 9) output is “0000”, ROM
(RO 3) address “OOH” (H indicates hexadecimal number)
The check data indicating the lens mounting is stored in the address of
This data has been applied to all types of interchangeable lenses.
It is common data (for example, 01010101). This and
Between the camera body (BD) and lens (LE).
If the burner (CV) is installed, the decoder (DE
5) The output terminal (g 2) of "High" makes the lens
The data “01010101” sent from (LE) is AND
Through the circuit (AN32) and the OR circuit (OR3),
The lens (LE) is directly attached to the camera body (BD)
If it is, it will be sent to the camera as it is, and the input terminal
Read from (SDI) to microcomputer (MC 2). this
The interchangeable lens is installed according to the check data
If is determined, the exposure metering mode is set and the exposure control
(EXC) controls the aperture. On the other hand, exchange lens
If it is determined that the
Only the metering mode is set and aperture control is not performed. The outputs of the counters (CO 5) and (CO 9) become “0001”.
Then, the lens ROM (RO 3) address “01H”
Is specified and the open aperture value data A from the ROM (RO 3)
vo is output. Note that the effective aperture is set according to the set focal length.
For zoom lens with variable values,
The maximum aperture value is output. In addition, the converter (CV)
A converter for the address "1H" of ROM (RO 1)
(CV) Equivalent to the amount of change in lens open aperture value due to mounting
Is stored in the ROM (OR
Constant value data β is output from 1). Decoder (D
E (5) terminal (g 0) "High" causes ROM (R
The data from O 1) and (RO 3) are added to the series addition circuit (AL
 This data is calculated by adding in 1) and calculating (Avo + β)
Via the AND circuit (AN30) and OR circuit (OR3)
Is output. The counter (CO 5) and (CO 9) outputs
When it becomes "0010", the ROM (RO 3) and (RO 1)
The address "02H" is designated respectively. RO of the lens
Minimum aperture data from M (RO 3) Avamx and convert
Data from the ROM (RO 1) of the
As in the case of the threshold value, the Avmax + β data is reattached.
If not, Avmax data is output. The count (CO 5) and (CO 9) outputs become “0011”.
Then, the address (03H) of the ROM (RO 3) of the lens
Is specified and the open metering error data is read from the ROM (RO 3).
Is output. Where the converter is not installed
If this is not the case, this data will be loaded directly into the camera body.
It On the other hand, if the converter (CV) is installed,
As shown in 4, all the outputs of the decoder (DE 5) are "L".
ow ”, the output of the OR circuit (OR 3) is the data from the lens.
It remains "Low" regardless of the
The data of "0" is read as the open metering error. this
Can be opened by installing a converter (CV).
Is a relatively small aperture, and the open metering error is "0"
You can think of it. Count (CO 5), (CO 9) output becomes “0100”
Then, ROM (RO 1) and (RO 3) are respectively
The address of "H" is designated. ROM of the lens (RO
Focusing lens at address “04H” in 3)
The direction of rotation of the motor (MO) when feeding (FL)
According to the data shown and this interchangeable lens depending on the set shooting distance
Indicates whether or not the lens type has a variable exchange coefficient
Data and are stored. For example, a motor clock
A model in which the focus lens is extended when rotated in the opposite direction.
If the lens is, the least significant bit is "1"
When it is rotated clockwise, the focusing lens is extended.
In the case of a lens of the type
There is. Also, the conversion coefficient changes depending on the set shooting distance.
In the case of a model lens, the least significant bit changes to "1"
If the lens is not available, the least significant bit will be "0".
ing. This data does not mean that the converter (CV) is installed.
It is sent to the camera body as it is. Decoder when the output of the counter (CO 9) becomes “0101”
The output of (DE 9) is "0" for a lens with a fixed focal length.
0101 ”, with a zoom lens it becomes“ 1001φ ”
Circuit (LEC) ROM (RO 3) is "05"
The address "H" or "001 *****" is specified.
It Note that "*****" is the data from the code plate (FCD).
Data. Fixed at this address in ROM (RO 3)
For a focal length lens, the fixed focal length f of that lens is 2
Logarithmic value with base₂ The data corresponding to f is
In the case of a mullens, the set focal length f of the zoom lens
Number log₂ The data corresponding to f is stored.
The data is output to the camera body. Also for the converter
Address "5H" is specified in ROM (RO 1)
At this address, a converter (CV) is attached to the camera book.
Wearing between the body (BD) and the interchangeable lens (LE)
The data γ corresponding to the amount of change in focal length
Remembered At this time, the output terminal of the decoder (DE 5)
Since the child (g 0) is "High", the adder circuit
(AL 1) focal length data log₂ A constant value de
The data obtained by adding the data γ is sent to the camera body. this
The focal length is used for determining a camera shake warning and the like. When the output of the counter (CO 9) becomes “0110”, zoom
In the case of a lens, "1010φ" from the Decoder (DE 9)
Data is output and the terminal (h 4) becomes “High”.
Transition from the input terminal α 2 of the data selector (DS 1)
The data is output. As a result, the ROM (OR 3) is designated with the address "010 *****". This ad
The focal length of the zoom lens from the shortest focal length
Aperture from the effective aperture value at the shortest focal length when changed
The change amount data ΔAv is stored according to the set focal length.
Has been done. In the case of a lens with a fixed focal length, ΔA
Since v = 0, the data of “0” is stored in the address “06H”.
Is remembered. This data is the converter (CV)
Is sent to the camera as it is regardless of whether or not
It In addition, this data is the aperture component from the open metering data.
Calculation for removal (Bv-Avo-ΔAv) -Avo-
Controls the effective diaphragm to the diaphragm aperture set or calculated by ΔAv.
It is used in the calculation Av-Avo-ΔAv for controlling. When the output of the counter (CO 9) becomes “0111”, zoom
In the case of a lens, the output of the decoder (DE 9) is "1011φ"
Therefore, the ROM (RO 3) is designated with the address “011 *****”. This ad
For conversion, the conversion coefficient data KD corresponding to the set focal length
Is remembered. Also, in the case of a lens with a fixed focal length
In case of ROM (RO 3), the address of “07H” is specified.
The fixed conversion coefficient data KD is written at this address.
It is remembered. Mechanical transmission that compensates for changes in conversion factors
If a converter with a built-in reaching mechanism is installed
This data is transmitted to the body as it is. This conversion
The coefficient data KD is calculated by the microcomputer (MC 1)
From the defocus amount | ΔL |, the calculation of | ΔL | × KD is performed and the motor drive mechanism (L
It is used to obtain the data of the driving amount of (MD). The conversion coefficient data is, for example, 8-bit data.
If, upper 4 bits exponent and lower 4 significant digits
It is divided into parts and is coded as shown in Table 6.The conversion coefficient data KD is KD = (k3 ・ 2⁰ + k2 ・ 2^-1 + k1 / 2^-2+ k0 ・ 2^-3) ・ 2ⁿ・ 2^m m = k4 ・ 2⁰ + k5 ・ 2¹ + k6 ・ 2²+ k7 ・ 2³ It is calculated by n = constant value (for example, -7). Note that k3 is the most significant bit of the significant figure part.
It is always "1" because it exists. Therefore, like this
If you code it, the value of KD will change in a fairly wide range.
Even if it is easy to operate in the microcomputer (MC 1),
It can be stored as data of the number of packets. Figure 7 shows the conversion coefficient data output from the zoom lens.
Is a graph showing the relationship between the focal length and the focal length, and the horizontal axis is log₂
 It corresponds to f and the vertical axis corresponds to the conversion coefficient KD. By the way, KD is shown by the straight lines A, B, C according to the focal length f.
Although it changes continuously as shown, in this example, the broken line
As indicated by A ', B', and C ', the values of KD are set to K 1 to K 33.
Is a discrete value of. Where K 1 = 2⁰In case of KD = “01111000”, K 2 = 2^-1+2^-2+2^-3+2^-FourIn case of KD = “0110111
1 ”, K 3 = 2^-1+2^-2+2^-3In case of KD = “01101110”, K 4 = 2^-1+2^-2+2^-FourIn case of KD = “01101101”, K31 = 2^-Four+2^-6In case of KD = “00101000”, K32 = 2^-Four+2^-7In case of KD = “00111001”, K32 = 2^-FiveIn the case of, KD = “00101000”. The focal length of the zoom lens is 5 bits on the code plate (FCD).
It is divided into a number of areas corresponding to the output of
For example, if the lens changes straight line A, f17 to f25 9
It is divided into zones. With this configuration, the f25
Is the closest to the smallest K value in that zone and
Data of small value K17, if it is a zone of f24, K16,
The f23 zone is K15, and the f22 zone is K13.
Data is output. The reason for determining the value of KD in this way is as follows.
It That is, set KD to a value larger than the actual data.
To drive the focusing lens to the in-focus position.
Encoder (ENC) pulse corresponding to the required drive amount
The number of N obtained by N = KD × | ΔL | is larger than the number
As a result, the lens passes the in-focus position and the in-focus position
Because the lens hunts before and after placing
It Therefore, if KD is set to a small value,
From the direction of, the focus position is approached, and the actual
I try to minimize the difference with KD
To shorten the time for the focusing lens to reach the in-focus position.
You can do it. In addition, if the value of KD is always set to a small value, the actual KD
When it reaches the in-focus position because the difference from the value of becomes too large
Can take too long, but saves time
In order to do so, as shown in the zone f18, f12 shown in B '
Provide a small area that is slightly larger than
So that you may go too far from the in-focus position
May be. Also, if the shooting distance is infinite, the solid line C (∞) is a short distance.
And the one-dot chain line C (near), depending on the shooting distance
There are zoom lenses whose numbers change drastically. This zoom
For example, the shooting distance is infinite in the focal length f1 zone.
If the position changes from the large position to the closest position, KD = k 17 =
Two^-2To KD = K15 =^-2+2^-FourChange to. like this
In this embodiment, there is no zoom lens so that it can be used with a zoom lens.
Only the conversion coefficient data at the maximum position is stored in the ROM (RO
3) and store it in the area near the focus range (hereinafter, near focus
Until it reaches the zone (indicated by the zone).
Defocus direction) for focus based on signal only
When the lens is driven to enter the near focus zone, the above KD
Drive the lens based on the value of N found by | ΔL |
I am trying to move. The focal length code plate (F
In addition to (CD), a code plate for the set shooting distance is installed separately.
Specify the ROM (RO 3) address with the code plate
It may be possible to obtain accurate conversion coefficient data by
Increased number of parts, increased number of bits for addressing, R
There is a problem such as an increase in the capacity of the OM, which is not practical. Furthermore, set the zoom ring from the position of the shortest focal length, for example.
Even if you move to the short focus side, macro photography can be performed.
There is a zoom lens configured to. (This zoom
Since the mechanism of the lens has nothing to do with the gist of the present application, its explanation
Is omitted. ) For such a zoom lens,
In the example, the code plate (FC
The data of “11111” is output from D) and the specified address
The space "01111111" is specified. Macro shot
In the case of shadows, the position of the pupil diameter does not change and the depth of focus does not become shallow.
Or the aperture value becomes dark, depending on the AF mode
It is difficult to adjust the focus, so "φφφφ"
The data of 0110 ”is stored, and its k 3 is“ 0 ”.
Has become. Microcomputer (MC 2)
Determine that you have switched to macro shooting, and then switch (F
Even if AF mode is set by AS), only the display
The focus adjustment mode is automatically switched to the FA mode. Also, if you do not set the shooting distance to the closest position,
A zoom lens configured to prevent switching to shooting.
There is a gap. With such a lens, you can switch to macro photography.
By the replacement operation, the switch (MCS) of FIG. 5 is closed,
Via inverter (IN17) and inverter (IN19)
The outputs of the AND circuits (AN40) to (AN44) are all "L".
ow ”. By this, the address of ROM (RO 3)
"01100000" is specified. Data of "φφφφ0100" as KD at this address
Is stored, the microcomputer (MC 1) stores this data.
If k3 = k1 = 0, the switching operation to macro photography has been performed.
And the shooting distance is automatically set to the closest position.
Rotate the motor (MO) to
Pay out. The light-receiving part for focus detection is an exit pupil with a shooting lens
The pupil diameter and the light receiving element (figure
(Optically equivalent to the Lum plane)
From the subject that has passed through the shooting lens according to the position of the pupil
Whether or not the light receiving element receives the light is determined. Therefore,
Depending on the lens, some light may not enter the light receiving part.
There are some. Focus detection is performed with such a lens.
However, since it is not reliable, the AF mode or AF mode
It is recommended that no action be taken. So Ren like this
In the case of
"011 *****" for lenses, fixed focal length lenses
"00000111") and the data of "φφφφ0001" is KD
To remember. The microcomputer (MC 2) uses this data
In step # 16-2 described later, the microcomputer (MC 1)
Performs focus detection operation in F mode or FA mode
Try not to. In addition, AND circuit (AN40) to (A
The data of "00000" or "11111" from N44)
If output, ROM (RO 3) address “001000
00 ”and“ 00111111 ”correspond to the focal length f during macro shooting.
The corresponding data is the address “01000000”, “01011111”
Stores the data corresponding to ΔAv during macro shooting.
Output from the ROM (RO 3). Also, the rotation of the drive shaft in the camera body is transmitted to the focus adjustment member.
For interchangeable lenses that do not have the climate to reach,
(2) “φφφφ0110” as KD as well as switching to shooting
It is stored, and only FA mode is possible. Change
In addition, like the lens described above, it does not have a transmission mechanism.
In the case of a burner, the output of the counter (CO 2) is “011
When it becomes 1 ”, the ROM (RO 1) reads“ φφφφ011
0 ”is output and the terminal (g1) of the decoder (DE 5)
Only the "High" and the data from ROM (RO 1)
If the data is transmitted to the camera body,
Even if a replacement lens is attached, only FA mode operation is performed
Be done. Insert converter to connect between camera body and interchangeable lens
If you do, the converter changes the focal length, so
Only the amount corresponding to the increase amount
It is necessary to install a reduction mechanism in the converter to reduce the amount of rotation.
There is a point. That is, the amount of rotation of the drive shaft of the camera body is unchanged
Only the mechanism that transmits to the drive axis of the focusing lens is controlled.
When preparing for a barter, the KD of the lens is used as is for the camera book.
Driven by N = KD × | ΔL |
When the axis is rotated, only the amount corresponding to the increase in the focal length
There is a problem that the position is out of focus. Therefore
For converters that do not have the above-mentioned reduction mechanism,
In the embodiment, for example, a converter that increases the focal length by 1.4 times
If so, KD is 1/2, and if it is a double converter, KD is 1 /
Exponent part of the upper 4 bits of KD so that it becomes 4
From the data (k7k6k5k4) of 1.4, if the converter of 1.4 times, 1
Is reduced, and if it is a double converter, 2 is reduced.
It Returning to FIG. 5, the output of the counter (CO 5) is “1000”.
Then, as shown in Table 4, the converter circuit (CVC)
A converter (CV) is installed from the ROM (RO 1)
Check data of “01010101” indicating that
I will be forced. At this time, the terminal (g1) of the decoder (DE 5)
Is "High", this check data is
Data from ROM (RO 3) of lens circuit (LEC)
AND circuit (AN31), OR circuit (OR
It is sent to the camera body (BD) via 3). When the output of the counter (CO 5) becomes “1001”, this
Vignetting due to the light flux being limited when the inverter is attached
The aperture value data Avl determined based on the
1) output from the AND circuit (AN3
1), sent to the camera body via the OR circuit (OR 3)
It This data Avl is opened by a microcomputer (MC 2)
The value data is compared with Avo + β. With Avo + B <Avl
By default, the photometric output is Bv-Avl, so (B
v-Avl) + Avl = Bv and narrowing stage number data Av
− (Avo + B) is calculated. Lens (LE) and converter as described above
When data acquisition from (CV) is complete,
Output of photometric circuit (LMC)
A-D conversion is performed (# 13), and this A-D conversion is performed.
The photometric output data is stored in a predetermined register (#
13). In step # 15, whether the release flag RLF is "1"
If this flag is "1", step 28
Directly move to the next step, and when it is "0", the steps from # 16 to # 26
After going up, move to step # 28. Where Lerry
The release flag (RLS) of the Z flag RLF is closed.
Interrupted after # 59 step
Set to "1" when the exposure control value of the camera is calculated in
This is the flag that is set. In addition, it is exposed during this interrupt operation
It is determined in step # 63 that the control value has not been calculated.
If it is done, import the above data in steps after # 5.
If the operation is performed and RLF = 1 in step # 15, #
Focus in AF and FA modes in steps after 16
Jump in the flow of detection operation and expose in step # 28
After performing the calculation, go through # 30 and then # 64
Exposure control is performed in step. In step # 16, the AF mode or FA mode is used.
It is determined whether or not the focus detection operation is possible.
Step # 17 if possible, # 28 if not
Go to step. In this step, the lens is attached
Whether or not (# 16-1), the diameter and position of the exit pupil can be determined.
Whether the conditions are correct for the light receiver (# 16-2)
Light from the subject is incident on all the light receiving parts for point detection.
Whether or not (# 16-3), is the metering switch closed?
Whether or not (# 16-5) is determined sequentially. Check data “01010101” is not entered here.
In the case (# 16-1), if k3 to k0 of KD data are “0001”.
(# 16-2), the diameter of the exit pupil of the lens is too small and the aperture is open.
Value Avo, Avo + β, Avo + ΔAv or Av1 is constant
Price

[For example, 5 (F 5.6)] If it is larger than Avc (# 16
-3), focus detection in both AF mode and FA mode
It is impossible to move out, so in step # 16-4
If the focus detection operation is not performed, the display control circuit (DS
After the warning is displayed in C), move to step # 28.
It Also, the photometric switch (MES) is open
If (i0) is "Low"(# 16-5), the FA mode
# 28 step for only 15 seconds
Move to. Check data input, k3 to k0 ≠ “0001”, Avo, Avo
+ Β, Avo + Av or Avl ≦ Avc, (i0) “High
If both are determined, proceed to # 17 and subsequent steps.
Transition. In step # 17, the output terminal (O 1) goes to "High".
, The microcomputer (MC1) has its input terminal (i11)
Focus detection operation in AF and FA modes by "High"
To start. In step # 18, the microcomputer (MC 2)
The read conversion coefficient data KD is input / output port (I /
O) to the data bus and output to the latch circuit (LA)
Make it latch. Latched by this latch circuit (LA)
The data is based on the No. 93 step described below of the microcomputer (MC 1).
Read in. In the step of # 19, the output of the counter (CO 9) is “01
Installed based on the data read when it was "00"
A lens whose conversion coefficient KD changes according to the shooting distance
Determine if the lens is a formula. Where the changing len
Output terminal (O 3) of the microcomputer (MC 2)
Set the input terminal (i13) of the microcomputer (MC 1) to "High"
If the lens does not change, set to "Low". Maiko
This signal is used by the master (MC 1), and details will be described later in No. 19
As described in steps 2 to No. 197, the imaging position is close.
Whether it is in the focusing zone or whether the integration time is
Depending on whether it is long or not, the motor (MO) in AF mode
Switch the drive. In the step of # 22, the counter (CO 9) is also “010”.
For focus based on the data read when it is 0 ”
Determine the rotation direction of the motor (MO) when extending the lens
Separate. Here, if it is clockwise, microcomputer (MC 2)
Output terminal (O 2) of the microcomputer (MC 1) input terminal
Set (i12) to "High", or "Low" if counterclockwise.
To The microcomputer (MC 1) sends a signal to this terminal (i12).
Of the motor (MO) by the signal and the signal in the defocus direction.
Determine the rolling direction. In step # 25, the third bit of the conversion coefficient data KD
Mounting by detecting whether the k3 is "1" or "0"
AF converter with the converted converter (CV) and lens (LE)
It is determined whether or not the focus adjustment operation by the camera is possible. this
At this time, if k3 = 1, AF mode is possible, so the flag MF
F is set to "0" and the process proceeds to step # 28. On the other hand, k3
If = 0, AF mode is not possible, so set MFF to "1".
Then, use the switch (FAS) to switch between AF and FA.
Detects whether any mode is selected. here
And AF mode is selected and the input terminal (i1) is
If it is "High", the AF mode is set by the photographer.
That FA mode can be automatically switched even if
The warning display by the display control circuit (DSC),
Go to step # 28. Input terminal (i 1) is "Lo
If w ”, FA mode is originally selected, so
Then, move to step # 28. In step # 28, read in steps # 5 to # 14
Set exposure control value, metering value, data from lens
A well-known exposure calculation is performed based on the exposure time and aperture value.
Data is calculated and the flag LMF is set to "1". In step # 30, whether the release flag RLF is "1"
If it is “1”, the exposure of the step after # 64 is performed.
Return to the flow of control operation. If it is "0", step # 31 is started.
Move to In step # 31, set the output terminal (O 8)
Inverter (IN
8) Make the transistor (BT 3) conductive and issue the issue
Warning display and LCD by (LD10) to (LD1n)
Display the exposure control value on the display (DSP).
It In step # 33, open / close state of photometric switch (MES)
To determine. Here, the photometric switch (MES) is closed.
If (i 0) is “High”, the timer interrupt
Data for counting 15 seconds for
Set it to Star Tc (# 34) and start the timer.
(# 35), timer interruption is possible (# 36)
Return to step. In this case, (i 0) is “High” (measurement
Immediately because the optical switch (MES) remains closed)
And move to step # 3 to disable timer interruption
Then, the same operation as described above is repeated. On the other hand, the metering switch (MES) is open (i0
) Is “Low”, press the switch (FAS) to A
It is determined whether F or FA mode is selected.
(# 37) based on the data from the lens.
The mode determined by the top is determined (# 38). here
, The input terminal (i1) is "Low" and FA mode is selected.
(# 37), or AF mode is selected.
Even if the flag MFF is "1" and the lens side is in FA mode,
If you can only operate, move to step # 40.
It When AF mode is selected and MFF is "0"
Outputs the output terminal (O 1) to “Low” (# 39)
After stopping the operation of (MC 1), move to the step of # 40.
To go. The FA mode is determined in steps # 37 and # 38.
Terminal (O 1) remains “High” when # 40
Move to step and continue operation of microcomputer (MC 1)
To be done. In step # 40, the open / closed state of the switch (EES) can be determined.
Separately, charging of the exposure control mechanism is not completed (i
If 2) is "High", move to step # 47.
A return operation to the initial state described later is performed. Exposure control mechanism
Is fully charged (i 2) is “Low”
For example, after enabling the timer interrupt in step # 36, #
Return to step 2 and close the photometric switch (MES) again.
Input terminal (i 0) becomes “High” or
Wait for a timer interrupt. Now, if there is a timer interrupt, 1 from the contents of register Tc
Was subtracted and (# 45), the content of Tc became "0".
It is determined (# 46). If Tc ≠ 0, # 5 or later
Move to the descending step to capture the above-mentioned data, exposure calculation
And so on. At this time, if the FA mode,
Since the child (O 1) is “High”, the microcomputer (MC 1) is F
The operation for A is repeated.
The terminal (O 1) is set to “Low” at the top
(MC 1) operation is stopped. On the other hand, when Tc = 0, the output terminals (O 0), (O 1),
(O 8) is set to “Low” and the transistor (BT 1)
And stop the power supply by the buffer (BF),
In case of stop of microcomputer (MC 1) operation, transistor
The power supply is stopped by (BT 3). Furthermore, the liquid
Blank display of crystal display (DSP), flags MFF, L
After resetting the MF, the process returns to step # 2. To summarize the above operation, the photometric switch (MES) is closed.
While it is being created, data acquisition, microcomputer (MC
The operation of 1), exposure calculation, and display operation are repeated.
It Next, when the photometric switch (MES) is opened, A
In F mode, the operation of the microcomputer (MC 1) is immediately
15 operations for data acquisition, exposure calculation, and display after being stopped
It is repeated for 2 seconds, and when in FA mode, data acquisition,
FA operation, exposure calculation, and display by microcomputer (MC 1)
The operation is repeated for 15 seconds. Also, the char of the exposure control mechanism
If the measurement is not completed, the metering switch (MES)
When released, data acquisition and operation of the microcomputer (MC 1)
Immediately stop the operation of exposure, exposure calculation, and display. Note that the warning display for steps # 16-4 and # 27-2 will be displayed once.
If the warning is no longer needed at the next flow,
Display data for canceling this warning Control circuit
Needless to say, it must be communicated to (DSC)
Yes. Next, release with the exposure control mechanism charged.
The operation when the switch (RLS) is closed is explained.
It In this case, what kind of operation is the microcomputer (MC 2)?
Even if you are doing it, release release from step # 59 immediately
Performs complicated operation. First, read the data from the lens
Considering the case where an interrupt occurs during
Set to “Low” to convert converter and lens circuit (CV
C) and (LEC) are reset (# 59), and the terminal
Set (O 1) to “Low” and use the microcomputer (MC 1)
The operation in AF or FA mode is stopped (# 60). Furthermore
The output terminal (O 8) is set to “Low” and the warning light emitting die
Turn off the lights (LD10) to (LD1n) (# 61),
After setting the release flag RLF to "1"(# 62)
Then, it is determined whether or not the above-mentioned flag LMF is "1".
(# 63). If the flag LMF is "1", the exposure control value is calculated.
Since the output has been completed, move to step # 64. one
If LMF is "0", the calculation of exposure control value is completed.
I haven't done so
Calculate the control value and proceed to step # 64. In step # 64, the aperture calculated in step # 28
Data of the number of steps Av-Avo, Av- (Avo + ΔAv
), Av− (Avo + β), Av− (Avo + β + ΔA
v) is output to the data bus (DB) and the output terminal (O
A pulse for data acquisition is output from (4) (# 6
Five). This narrows down the exposure control device (EXC).
Data of the number of steps is captured and the exposure controller
The number of narrowing steps taken after the target narrowing operation was started
When the diaphragm is narrowed down, the narrowing operation is completed. A certain time has passed since the pulse output from the output terminal (O 4)
Then (# 66), the calculated exposure time data Tv is
It is output to the data bus (DB) and output from the output terminal (O 5).
A pulse for capturing data is output (# 67, # 68). This
Exposure pulse causes the exposure control device (EXC)
Data is captured and the built-in mirror drive
The circuit starts the mirror-up operation. Mirror up
When the shutter is closed,
The count switch (COS) is closed and taken in.
The counting of the time corresponding to the exposure time data
It When the count is over, the shutter rear curtain starts running
To complete the trailing curtain, down the mirror, and open the aperture.
As a result, the switch (EES) is closed. This switch (EES) is closed in the microcomputer (MC 2)
And determine that the input terminal (i 2) has become “High”
Then, (# 69) resets the relays flag (RLF).
(# 70), the metering switch (MES) is closed.
To determine whether the input terminal (i 0) is "High"
(# 71). Here, if (i 0) is “High”, #
Return to step 2 and subsequent steps to import the above-mentioned data, Myco
Repeat the operation of the monitor (MC 1), exposure calculation, and display.
On the other hand, the photometric switch (MES) is opened in step # 71.
If the input terminal (i 0) is set to “Low”, # 47 or later
Move to the descending step and set the microcomputer (MC 2) to the initial state.
Then set the condition and return to step # 2. 8, 9 and 10 show the operation of the microcomputer (MC 1)
It is a flowchart showing. Movement of microcomputer (MC 1)
The works are roughly classified into the following three flows. The flow starting with step No. 1 is the microcomputer (MC
2) Main flow started by the focus operation command from
And the CCD (FLM) by the control circuit (COT)
Operation start (No.8), judgment of motor rotation (No. 8)
10-No.13), longest integration time of CCD and longest
Operation when the integration time has elapsed (No. 14 to 19), focus recording
Detecting the end position of the sensor and measuring the longest integration time (No. 35-
44), with motor stopped at end position and low contrast
Restart (No.43-48, 51-67), microcomputer (MC
Initial setting when the operation of 1) is stopped (No. 25 to 33), low brightness
CCD data conversion (No.78-80), defocus amount
And defocus direction calculation (No. 81 to 91), AF mode
Judgment of whether or not the lens can be operated (No.92-96),
Contrast discrimination (No.100), in AF mode
Motor drive to focus zone and focus determination (No.125-
196) (Fig. 9), focus determination in FA mode (No.
240-261) (Fig. 10), operation at low contrast (N
o.105-115,205-214), macro shooting at the closest shooting position
Motor drive in case of lens that can switch to shadow (No.22
0 to 232) and the like are performed. Steps No. 70 to 76 are the ends from the control circuit (COT).
The CCD output signal is output by the CCD integration completion signal to the child (it).
The flow of the terminal interrupt in which the reading operation of the data is performed.
It The steps No. 200 to 204 in FIG.
Match signal from counter ECC via coder (ENC)
A counter interrupt in which focus is determined by outputting
This is the flow of Mino. Note that once the terminal interrupt is enabled
Then, even if the counter interrupt signal is generated after that, the terminal assignment
The counter interrupt will not be executed until after the
Therefore, the priority order of both interrupt operations is set.
It In the following, this embodiment will be described based on this flowchart.
The operation of the AF and FA modes will be described. First, the power is turned on in response to the closing of the power switch (MAS).
From the on-reset circuit (POR 1) to the reset signal (PO
1) is output, and this reset signal causes the microcomputer (MC
1) Perform the reset operation (N0.1) from the specified address.
U In the step of N0.2, the switch (FAS) is closed.
The input terminal (i14) is "High".
To determine. If (i14) is "High", then A
Since the F mode is selected, set "0" to the flag MOF.
If it is set and "Low", FA mode is selected
Therefore, the flag MOF is set to "1". In step No.5, output terminal of microcomputer (MC 2)
(O 1) is “High”, that is, the input terminal (i 11) is “High”.
It is determined whether or not it is ".
If the child (i11) is "Low", return to No.2 step.
Repeat the above operation. (I11) is "High"
If it is determined that the output terminal (O16) is "High"
(No.6), and the inverter (IN 5)
Power supply line (VF) by turning on the transistor (BT 2)
To start power supply. Next, CCD (FLM) integration
The time counting register ITR is fixed to correspond to the longest integration time.
Set constant data C 1 (No. 7). Then the output terminal
Output a "High" pulse from (O10) (No.8
), The integral movement of CCD (FLM) in the control circuit (COT)
After starting the work and enabling interrupts (No. 9), No. 10
Go to step. In steps 10 to 13, the motor (MO) turns
Whether or not it is rolling is sequentially determined. That is, the first
The flag FPF determines whether or not the focus detection operation is performed.
(No.10), focus lens (FL) drive position
Whether or not has reached the closest or infinity end position
The drive position is in focus by the end flag ENF (No. 11).
Whether or not it is inside the scene is determined by the focus flag IFF.
(No.12), switch (FAS) which mode
Is selected by the flag MOF (No. 13),
Each is sequentially determined. Here, if the first focus detection operation is performed,
Is at the end position or is in the focusing zone
Or if FA mode is selected, the motor
-(MO) rotation is stopped,
Move on. In addition, the focus detection operation after the second time
And the lens reaches the end position, the focus zone
If the AF mode is not selected and the AF mode is selected,
Since the target (MO) is rotating, the
Move to The flag FPF indicates the first focus detection.
The period during which the operation is being performed is "1", during the second and subsequent operations
Becomes "0" and the end flag ENF is set to the focus lens.
(FL) drive position is closest to infinity position
Even if the motor (MO) is rotated further
When no pulse is output from the encoder (ENC)
Is set to "1" and the focus flag IFF indicates that the lens is in focus.
"1" when you are in the computer, "0" when you are out
It In the steps after No.14, first register for integration time measurement
"1" is deducted from the contents of TAITR (No.14),
Whether or not the borrow BRW is coming out from the register ITR
Determine (No. 15). Borrow BRW is not here
If so, the low brightness flag LLF is set to “0” (No. 1).
8), from the microcomputer (MC 2) to the input terminal (i11)
Input "High" signal to operate controller (MC 1)
Determine whether or not (No. 19), (i11) is
If it is "High", return to step No.14 and perform this operation.
Repeat. If it is "Low", the step after No.25
After returning to the initial state and performing a return operation to the initial state,
Return to step o.2 and input terminal (i11) becomes "Hig" again.
It has a value of h ”. On the other hand, borrow at step No.15.
If it is determined that BRW has occurred, the longest integration time elapses.
It has passed and outputs a pulse to the output terminal (011).
(No. 16) to force the integration operation of CCD (FLM)
Stop, set the low brightness flag LLF to "1", and control
An interrupt signal is output from the line (COT) to the interrupt terminal (it)
Wait for In steps after No. 35, first, the register T for clocking is used.
The question data C 2 is set in the WR at a certain time (No. 35), and the cash register
Borrow by subtracting n (for example, 3) from the contents of the Star ITR
It is determined whether BRW is out (No. 37). here
Then, if it is borrow BRW from the register ITR,
Similarly, since the longest integration time has elapsed, N
Integral operation of CCD (FLM) by moving to step o.16
Is forcibly stopped and LLF of the low brightness flag is set to "1".
Then, an interrupt signal from the control circuit (COT) to the interrupt terminal (it)
Wait for you to type. If the borrow BRW does not appear, the low brightness flag LL
Set F to "0" and subtract "1" from the register TWR.
Determine if Borrow BRW is out (No.4
0). At this time, if the borrow BRW does not appear, the input end
Whether or not the child (i11) is "High" is No.41.
Determine in step. (I11) becomes "High"
If so, go back to No. 36 step and become "Low"
For example, move to step No.25. In addition, C1 / n> C2
, And Borrow BRW by the judgment in No.37 step.
Until it appears, it is judged multiple times in the steps of No.40.
Borrowed. When borrow BRW comes out in step No.40, encoder
Data ECD counting the number of pulses from (ENC)
To the register ECD 1 (No.42), and set this
Data and the contents of register ECR 2 are compared (No. 4
3). Note that the register ECR 2 was previously loaded.
The count data that has been set is set. Where regis
If the contents of ECR 1 and ECR 2 do not match, the
Of the register ECR1
Set the contents in the register ECR2 (No.44) and set No.35.
Return to step. Of the registers ECR 1 and ECR 2 in step No. 43
If they match, the encoder (E
The pulse count data from NC) has not changed.
I.e. the lens does not move, the closest position or infinity
You have reached the stage. So in this case
Disables interruption (No.45) and outputs to the output terminal (O11).
Outputs a pulse (No.46) and integrates the CCD (FLM)
Operation is forcibly stopped and output terminals (O12) and (O13)
Both are set to “Low” (No. 47) and the motor (MO) turns
Stop the rotation and set the low contrast flag LCF to "1".
Determine whether (No.48). This flag LCF is
If the subject has low contrast and the CCD (FLM)
Defocus amount ΔL calculated based on output is reliable
It becomes "1" when it is scarce. Here, the flag LCF
When it is "0", the end flag ENF is set to "1" (N
o.49), and proceed to step No.270 in FIG. No.
In step 270, the input terminal (i14) is "High".
It is determined whether or not it remains as it is. (I14) is "High" and AF
If the mode is still selected, the No. 2
Move on. On the other hand, (i14) is "Low"
If it has been switched to FA mode by
Set to "1" and set terminals (O12) and (O13) to "Low"
The motor (MO) is stopped and the flags LCF, LCF 1,
After setting LCF 3 to “0”, return to step No.2. The above operation is summarized as follows:
The CCD integration is started by the command of the focus detection copper product, and the
Enable the start of counting the longest integration time.
It If the motor (MO) is not rotating at this time,
An interrupt signal is input while counting this longest integration time
Wait until the maximum time elapses and the interrupt signal is input.
If not, the CCD integration is forcibly stopped and the interrupt signal is sent.
Wait for the number to enter. On the other hand, start integration operation of CCD
If the motor (MO) is rotating when the
Whether the lens reaches the end position during time counting
Wait for the input of interrupt signal while discriminating whether
Even if the long integration time has elapsed, no interrupt signal is input and the
If the pixel has not reached the end, force CCD integration
Stop and wait for interrupt signal. Also, the lens reaches the end
If so, interrupts are disabled and integration is forcibly stopped.
Stop the rotation of the motor (MO), and again CCD
Is calculated and ΔL is calculated and focused as described later.
It is determined whether or not, and after that, from the microcomputer (MC 2),
"High" signal to input terminal (i11) of controller (MC 1)
Even if is input, the microcomputer (MC 1) detects focus
This signal becomes "Low" without the point adjustment operation.
The photometric switch (MFS) is closed again and the input terminal (i1
When 1) becomes "High", operation from step No.2
To start. Now, in the step of No.48, the flag LCF is "1".
If it is determined that the flag LCF 1 is “1”,
It is determined (No. 51). Here, LCF is "0"
If so, set LCF 1 to “1” (No. 52) and switch No. 60.
Determine whether the focus direction flag FDF is "1" at step
To do. The flag LCF 1 indicates whether the lens position is the in-focus position.
Whether it is in a so-called bokeh state that is greatly deviated from
The lens whose contrast is higher than a predetermined value to judge
The flag for scanning the scanning position and the flag FDF are ΔL
> 1 when assembling the lens (front pin), “1”, ΔL <
When the lens is extended at 0 (back pin), the
It is Gu. At this time, if the FDF is "1", it becomes "0",
If it is "0", it is reset to "1" and input terminals
It is determined whether (i12) is "High" (No. 63, 6)
Four). That is, the direction of rotation of the motor for extending the lens
And (i12) is “High” in step No.63.
In order to extend the lens, it must be rotated clockwise.
Since it must be done, move to No. 66 step and set the terminal (O
12) to "High" and (O13) to "Low" (i12)
If is “Low”, the motor (M
O) must be rotated counterclockwise, so N
Go to step o.65 and set terminal (O12) to “Low”,
Set (O13) to "High". Also, the steps of No. 64
If (i12) is "High", it is necessary to retract the lens
The motor (MO) must be rotated in the measuring direction
Therefore, move to step No. 65. (I12) is “Low”
If so, the motor (MO) in the clockwise direction to retract the lens
Must be rotated, so move to step No. 66.
To go. Next, in step No. 67, the terminal (O14) is set to "H".
Set to "igh" to rotate the motor (MO) at high speed.
Go to step 270. The flag LCF 1 is "1" in step No.51.
Is determined to be the closest or
The infinite end position has been reached, and the motor (M
O) is stopped (No.53), and (i11) becomes "Low".
Wait for (No.55), flags LCF, LCF 1, LCF
Set 3 to “0” and return to step No.25. Now, a series of operations in the case of low contrast will be described.
First, in the AF mode with low contrast, the output port
Outputs "101" to (OP 0) and displays a warning (N
o.105), and then whether the flag LCF is "1"
Determine whether. (No.107). Here, the flag LCF
Is not "1", but this time it became low contrast for the first time
If so, set flags LCF and LCF 3 to “1”
(No. 108, 109), the first operation in the step No. 110
It is determined whether (FPF = 1). Flag FPF
If it is “0”, the operation up to that point is low contrast.
No, there is a possibility that this measurement is incorrect,
Move to No. 280 step, and follow No. 270, 271 step.
Back to No. 2 step and repeat the measurement.
It At this time, the motor rotates toward the previously calculated value.
ing. The end flag ENF is "1" and the No. 110
If you move to No.280 step after step,
Since the rotation of the motor (MO) is stopped, the input terminal
Wait until (i11) becomes "Low" (No.281), then
After setting the lag LCF and LCF 3 to "0" (No. 282)
Stops the operation of the microcomputer (MC 1) in steps after No.25
Initial value setting for. If the flag FPF is "1" in step No.110,
If it is determined that this is the first operation, the flags FPF, L
CF 3 is set to “0” (No. 111, 113) and No. 205
Whether the defocus amount ΔL is positive or negative is determined by the step. ΔL>
If 0 is the front pin, flag FDF is set to "1", and if ΔL <0, the rear pin
If yes, set flag FDF to “0” (No. 206,209), and
The lens was extended in the same way as the steps No. 63 to 66 described above.
The motor (M) depending on the direction of rotation of the motor (MO)
Rotate O) counterclockwise or clockwise. Then N
Integration time in steps of o.212 (contents of register ITR)
Is shorter than a constant value C 7
If the interval is less than a certain value ((ITR) ≧ C 7), the terminal (O
14) is set to “High” to drive the motor (MO) at high speed.
(No.213), when the integration time is over a certain value, the terminal
(O14) is set to "Low" to drive the motor (MO) at low speed
(No. 214), and after No. 270 step, No. 2
Return to the step and start the measurement again. in this way
After that, until the measured value does not have low contrast,
Then, move the lens in the direction that was fixed first. Lens reaches one end position with low contrast
Then, the flag LCF 1 is set to “1” in the step No. 52.
To reverse the direction of movement, and repeat the measurement
To move. Still with low contrast and other termination
When the position is reached, the lens moves from one end to the other
Since it has been scanned, move to step No. 55.
Stop the operation. During this operation, the measured value is
If it is determined that it is not trust, the No. 101 step
Lens system based on the defocus amount described later.
Perform your actions. Where suddenly low contrast
If this happens, ignore the first measurement value as described above and
Make a measurement, and if low contrast is still present, flag
LCF 3 is "1" (No.112), so LC
Set F 3 to “0” and move to step No. 205.
The lens movement direction based on the measured value
Find the position where the trust is above a certain value. In case of low contrast in FA mode (MOF = 1)
Moves from step No. 106 to step No. 115
Then, the flag LCF is set to “1”, and the flags LCF 1 and LCF are set.
3 is "0", flag FPF is "1", end flag ENF
To "0" and output terminals (O12) and (O13) to "Low"
Then, move to step No.258 and perform the operation described later.
Then, measure again. The microcomputer (MC 1) starts from step No. 9 to No. 1
4,15,18,19 loops or No. 35-40, 42-44 loops
C or while executing the loop of No. 36 to 41, C
When the integration operation of CD (FLM) is completed, the interrupt terminal (it
), A "High" pulse is input from the control circuit (COT).
When you press it, the microcomputer (MC 1) will move to No. 70 step.
To start the interrupt operation. First, the encoder
The value ECD obtained by counting the pulses from (ENC) is
Is set to ECR 3 (No. 70), and
The number, that is, the input port (IP 0) of the microcomputer (MC 1)
The value C 3 corresponding to the number of input data is the register DN.
Set to R (No.71) and input terminal at No.72 step
Wait for the "High" pulse to be input to (i10).
After the A / D conversion of CCD output is completed, the input terminal (i10)
When it becomes "High", it is input to the input port (IP 0).
Only one CCD output data CD is register M (DNR)
Is set (No. 73). Next, the contents of the register DNR
"1" is subtracted from this (No.74), and this register DNR
Steps of No. 72-75 until the borrow BRW is output from
Repeats. In this way, the CCD output data C
D is sequentially set in the register M (DNR). All
When the output of CCD output data CD is completed,
Address and set the return operation to that address.
I went and moved to the main flow after Step No. 77.
To go. In step No.77, whether the flag LLF is "1"
To be determined. Here, if LLF is "1", from the CCD
The largest data MACD among all data CDs
(No. 78). The most significant bit of this data MACD
If not "1", all CCD output data ALCD
It is doubled (No.80), and when it is "1", it is doubled.
Then, overflow data will appear, so No.
Go to step 81. On the other hand, the flag LLF is "0"
If so, immediately move to step No. 81. In steps 81 and 90,
Integer and fractional parts of the shifts of two images in the equivalent plane
Is calculated. In addition, the shift in these steps
A concrete example of the calculation of the quantity is, for example, US Pat. No. 4,333,007.
Is proposed in JP-A-57-45510.
Since it has nothing to do with the effect, the description is omitted. No. 82-85
In the step, like the steps of No. 10 to 13 described above,
Whether or not the motor (MO) is rotating is determined. Where
If the data (MO) is rotating, the encoder (ENC)
The count data ECD of the number of pulses from the register EC
It was taken into R 1 (No.86), and this data and No.44
Compare with the contents of register ECR 2 previously fetched
To be done. If (ECR 1) = (ECR 2), the lens has reached the end
Since it means that it is moving from the step of No. 47 mentioned above.
If (ECR 1) ≠ (ECR 2), the lens has reached the end
Since it is not, reset the contents of ECR 1 to ECR 2 and set N
Go to step o.89. On the other hand, the motor (MO)
If it is not rotating, move to No. 89 step immediately.
It In step No.89, is the input terminal (i11) "High"?
Determine if it is "Low" and after Step 25
The focus detection operation of the
When h ”, shift to No.90 step and shift amount is small.
Calculate several parts and calculate in steps No.81 and No.90.
The defocus amount ΔL is calculated based on the shifted shift amount.
(No.91). When flag IFF 1 is "0" (No.305), No.92 or later
The descending step is executed. In No.92 step,
If the AF mode is determined by the lag MOF, the AF
If in mode, go to step No. 93, if in FA mode, go to step No. 10
Move to step 0. In AF mode, first
Latched by latch circuit (LA) by controller (MC 2)
Import the conversion coefficient KD that was used from the input port (IP 1)
(No. 93), k3 of this data is "0" and k2 is "1"
It is determined whether or not (No.94). Where k3 = 0 and k2
If = 1, as described above, the interchangeable lens
Mode flag MOF
Set to "1" (FA mode) and move to No. 96 step.
It On the other hand, if k3 = 1 or k2 = 0, the AF mode is
It means that an interchangeable lens that can be used is installed, No. 10
Go to step 0. Furthermore, in the step of No. 96
Determines whether k1 = 0. If k1 = 1, No.100
Go to step. If k1 = 0, as mentioned above, move the lens to the closest position.
A lens is attached that cannot be switched to macro shooting unless extended.
And is about to switch to macro photography
become. At this time, move to step No. 220 and exit.
Set the power terminal (O14) to "High" and turn on the motor (MO).
Rotate at high speed, then input terminal (i12) is "High"
It is determined whether or not (No.221). Where (i12) is
If it is "High", rotate it clockwise to
Output terminal (O12) is "High".
If it is "Low", rotate it counterclockwise.
Since (O13) is set to "High", the
Register the count data ECD of the pulse from the encoder
Imported to ECR 2 (No.224). Next, set the constant time data C 8 in the register TWR.
(No.225), "1" is set from the contents of this register TWR.
Then, the operation for determining whether or not the borrow BRW has been repeated.
Return, Enko when borrow BRW comes out after a certain period of time
Register the count data ECD of the pulse from the recorder
Take in CR 1 (No.228). Then register ECR
It is determined whether the contents of 1 and ECR 2 match (N
o.229), (ECR 1) ≠ (ECR 2), ECR
Set the contents of 1 to ECR 2 (No.230) and set No.225 to
Repeat step 230. On the other hand, (ECR 1) = (EC
In the case of R 2), the lens has reached the closest position
Motor with output terminals (O12) and (O13) set to "Low"
(MO) is stopped (No.231) and the flag FPF is set.
Set to "1" (No.232) and return to No.2 step.
After that, the operation in the FA mode is performed. In the step of No.100, the data from CCD is low
It is determined whether it is a trust. The details of this step
An example will be described later with reference to FIG. Where low contrast
If the answer is No, the process proceeds to the steps after No. 105 described above.
On the other hand, if the contrast is not low, step No. 101
Then, it is determined whether the flag LCF is "0". here,
If LCF is "1", the measured value up to the previous time is low
Since it is the last, the flag FPF is "1", and the flags LCF and L
Steps of No. 290 with CF 1 and LCF 3 set to “0”
Then, the mode flag MOF is referred to. MOF = 0
That is, in the AF mode, the output terminals (O12) (O13)
After the motor (MO) is stopped as "Low", No. 2
Return to step and make measurement again. Also, MOF
= 1, that is, if it is FA mode, move to step No.240.
Then, the operation in the FA mode described later is performed. No. 101
At the step, the flag LCF = 0 and the previous measured value is low.
If it is not a strike, see the mode flag MOF in No. 104.
If MOF is “1”, that is, FA mode, No.240
If the MOF is “0”, that is, the AF mode,
Move to step No.125. In steps from No. 125 to 130, the defocus amount ΔL is
Judgment as to whether or not it is within the focus zone ZN 1
Another operation is performed. First, when the lens reaches the end position
If the flag ENF is "0" (No.125) and
Once the focus zone has been reached and the focus flag IFF is "1"
If there is (No. 126), the measured value of this time | ΔL | and Z
Compare N 1 with step No. 127. Where | Δ
If L | <ZN 1, the focus is displayed (No.128) and the
Set IFF 1 to "1" (No.300), microcomputer of Fig. 2
Set the output terminal (O30) of (MC 1) to "High" (No. 30
1) Do. This output terminal (O30) is a microcomputer (MC 2)
Connected to the input terminal (i5) of the
2) is the lens by the "High" of its input terminal (i5)
It is determined that the focus position is reached. Next, the microcomputer (M
C 1) shifts to No.270 step and switches to FA mode.
If not, go back to No.2 step,
Take the measurement again. On the other hand, if | ΔL | ≧ ZN 1 in step No.127,
After the No.130 step, set the flag FPF to "1"
Moved to No.135 step with the GIF as "0", and now
Lens control movement by defocus amount based on one measurement value
The work is done. Also, if the lens reaches the end,
GUENF is “1”, and in step No.127, | ΔL
If | ≧ ZN 1, the previous defocus direction was displayed.
Until then, move to step No.129 and input terminal (i1
Step 1 of No.25 after waiting for 1) to become “Low”
Move to and stop operation. Where | ΔL | ≧ ZN 1
If so, leave No. displayed with the previous defocus direction displayed.
Go to step 129, in which case the lens is terminated.
Even if the position is not in focus, the motor (MO) is controlled after that.
Since it is useless, the operation of the microcomputer (MC 1) is forcibly stopped.
Stop it. Check that the lens has reached neither the end position nor the focus zone.
If and are determined in the steps of No.125,126, first, No.
In step 131, the first pass flag FPF is
It is determined whether it is "1". Here, the flag FPF is
When it is "0", it is the same as the step of No.86-88.
Discriminating operation is performed (N
o.132-134) and then move to step No.135.
When the FPF is “1”, the No.135 step
Move to In step No.135, the microcomputer (MC
The focus detection command signal from 2) is discriminated and the input terminal (i
When 11) is “Low”, return to step No.25 and perform the operation.
Stop, and if it is "High", move to step No.136
To do. In step No. 136, the calculated defocus amount Δ
L is multiplied by the read conversion coefficient KD to obtain a lens driving device.
The drive amount data N of the structure (LDR) is calculated, and No.
Determine whether the flag FPF is "1" in step 137
To do. Here, if the flag FPF is "1", first,
Whether N is positive or negative is determined (No.140), and if positive, the focusing direction
After setting the flag FDF to "1" and to "0" if negative, drive
The absolute value of the motion amount N is set in the register ECR 4 as Nm.
(No.144), the flag FPF is set to "0" and No.16
Go to step 6. On the other hand, the flag FPF is "0" in the step No.137.
If so, first, the record of the previous drive amount data is stored.
The contents of register ECR 4 are moved to register ECR 5 (N
o.150), instead of the encoder at this point (ENC)
The count data ECD of the pulse from the register ECR
It is taken in by 4 (No. 151). That is, C in ECR 5
The count data Tc1 at the end of the CD integration is ECR
The count data Tc2 at this point is set in 4
Will be. Next, in the period required for CCD integration
Lens movement amount τ = Tco−Tc1 to calculate N
Lens movement amount to = Tc1−Tc2 during the period required for
It is calculated. Here, in the middle position of the integration period of the CCD
If N is obtained, the lens at this point
It has moved by τ / 2 + to from the time when N was obtained. Well
Also, the amount of lens movement from N'm obtained in the previous flow
Data N ″ m = N′m−τ−to corrected with τ + to calculated
To be done. In addition, this data N ″ m is inevitably positive. In steps No. 155 to 157, the defocus amount N is positive or negative.
And the flag FDF determine whether or not the focusing direction is reversed.
Be separated. First, in step No.155, this time is calculated
It is determined whether the defocus amount N is positive and N is positive.
If so, it is determined whether or not the flag FDF = 0 (No. 15)
6). At this time, if FDF = 0, it means that the direction has been reversed.
Go to step No.158, reverse if FDF = 1
No, so move to step No.159. On the other hand, N
If is negative, it is determined whether FDF = 1 (No.157
), If FDF = 1, it is reversed, so
Up, and if FDF = 0, it has not reversed, so No.
Go to step 159. When the directions are not reversed,
That is, in step No.159, the rotation of the motor
Since it is approaching the in-focus position, the value of N is in the middle of the integration period.
Is calculated as | N | -τ / 2-to = N '
To correct the movement caused by the rotation of the motor.
Then, it is judged whether this N'is negative (No. 160). This
If N '<0, it means that you have passed the in-focus position.
Then, with | N '| = N', move to step No.164,
If N '> 0, go to the step No.161 and get until the last time.
Average of data N "m and N '(N" m + N') /
2 = Na is taken (No.161), and this data Na is taken as Nm.
Then (No. 162), the process proceeds to step No. 166. When the direction is reversed, that is, step No.158
Is now τ / 2 + to from the time this data was obtained
Since it is far from the in-focus position in the direction of defocusing,
A correction calculation of | N | + τ / 2 + to = N ′ is performed to obtain N
Go to step o.164. No.164 steps
The average of N "m and N '(N"m-N') / 2 = Na is calculated.
Then, it is determined whether this average value Na is negative.
(No.165). Here, if Na> 0, move to step No. 162 described above.
If Na <0, set terminals (O12) and (O13) to "Low".
To stop the rotation of the motor (No.174) and focus
Focusing zone by multiplying the data ZN 1
Data Ni of the motor rotation amount is calculated. (No.175
). Next, it is judged whether or not | Na | <Ni.
Separated (No.176), if | Na | <Ni, focus zone
, So set the focus flag IFF to "1"
Go to No. 2 step after No. 270 step
It On the other hand, if │Na │> Ni, the focus zone has passed.
Therefore, the flag FPF is set to "1" and No. 27 is set in the same manner.
After step 0, move to step No. 2
Redo the work. By the way, in the step of No.166, the data indicating the in-focus zone is displayed.
KD on the data NZ from the near focus zone to the focus position
Data corresponding to the driving amount of the lens is calculated. next
In step No.167, the near focus zone values ZN 1 and KD
From Ni = ZN 1 × KD to calculate the focus zone
Data Ni of the driving amount of the lens is calculated (No. 167).
), Nm and Nn are compared (No. 168). here
If Nm ≧ Nn, that is, if it is outside the near focus zone,
Go to step and set terminal (O14) to "High"
Rotate the motor (MO) at high speed, and use the encoder (EN
Counter for counting down the pulses from C)
Set Nm-Nn to ECC (No.182), No.185
Go to step. On the other hand, Nm <Nn, that is, it is determined that it is within the close focusing zone.
Then, in step No.169, whether Nm <Ni
Determine. Here, if Nm ≧ Ni, the near focus zone
Even if it is inside, it is not inside the focusing zone, and the output end
Rotation speed of motor (MO) with child (O14) as "Low"
Slow down (No.183) and set Nm in the counter ECC.
(No.184) and move to step No.185.
In the case of a lens whose KD changes depending on the shooting distance,
If it is not in the focus zone, the signal in the defocus direction is used.
Lens control is performed only for
When calculating, the correction of the lens movement amount from No.150
Since it will be carried out, because of this correction data No. 182
In step, Nm-Nn is set in the counter ECC.
If Nm <Ni, output terminals (O12), (O13)
To “Low” to stop the motor (MO) (No. 17
1), set the focus flag IFF to "1" (No.172), and
Disable interrupter (No.173) and switch to No.270.
Return to step and repeat the confirmation measurement. By the way, in the step of No.185, is the flag FDF "1"?
Determine whether Here, if the FDF is “1”, the front pin
Therefore, output "100" to the output port (OP 0)
Turn on the photodiode (LD 0) and display the front pin
(No.186), if it is "0", it is a rear pin, so it is an output port.
"001" is output to (OP 0) and the light emitting diode (L
D 2) is turned on to display the rear pin (No.189).
Next, the contents of this flag FDF and the exchange to the input terminal (i12)
The motor (MO) is activated by the signal of the rotation direction of the interchangeable lens.
Rotate clockwise or counterclockwise (No.188,191
), No.192 step, input terminal (i1
It is determined whether or not 3) is "High". Where the conversion clerk
With an interchangeable lens, the number of which changes according to the shooting distance
If (i13) is "High", the No. 193 step
It is determined whether Nm <Nn. At this time
If Nm ≧ Nn outside the station, the above No. 182
Immediately moved from step No. 185 to step No. 185
Thus, regardless of the calculated Nm,
Only the motor (MO) is rotated in the correct direction.
It Next, the integration time is longer than the constant time value corresponding to C 7.
It is determined whether or not (No.194), and if the lens is long, the lens
The terminal (O
Set 14) to "Low" to drive the motor (MO) at low speed.
(No.195), making counter interruption impossible (No.196)
), Goes through No.270 step and returns to No.2 step
It On the other hand, in the step of No.193, Nm <Nn
When it is determined that it is in the focusing zone,
Enables counter interruption, just like a normal interchangeable lens
(No.197), return to step No.270. Also type
Counter interrupt is possible even when the terminal (i13) is "Low"
Then return to step No.270. Now, while the motor (MO) is rotating, the encoder (EN
Contents of counter ECC that counts pulses from C)
When becomes “0”, the counter is interrupted and the No. 200
In step, it is determined whether Nm <Nn. Where N
If m <Nn, turn the motor (MO) in the near focus zone.
It was rotating, that is, it reached the focusing zone,
Motor with output terminals (O12) and (O13) set to "Low"
Stop rotation of (MO) (No.203) and focus flag
Set (IFF) to "1" and return to step No.270.
On the other hand, if Nm ≧ Nn, the near focus zone is reached.
The output terminal (O14) is set to "Low" and the motor is turned on.
Set to low speed (No.201) and set Nn to counter ECC.
(No.202) After that, return to the address where the interruption occurred. Next, in the step of No.104 or No.290, the flag MO
If F is found to be "1", then after No.240
The FA mode operation is performed in steps. First, No.
In step 240, it is determined whether the flag FPF is "1".
Be separated. Here, if FPF is "1", FA for the first time
Mode operation is performed and the AF mode is switched off.
Since it is changed, the end flag ENF is set to "0", and the focus is set.
The flag IFF is set to "0" and the focus zone discrimination register
Focus zone data ZN 2 is set in IZR. In addition, this
The data ZN 2 of is larger than the data ZN 1 in AF mode.
It is a threshold. This is the mode in AF mode.
The lens position can be adjusted accurately by the motor drive.
Yes, but in FA mode, adjust the lens position manually
Therefore, it is very difficult to make adjustments with the same precision as driving a motor.
Because. Next, in step No. 245, the first pass
Set the flag SPF to "0" and move to step No.246.
To go. On the other hand, if the flag FPF is "0", immediately No.24
Go to step 6. In step No.246, is the focus flag IFF "1"?
It is determined whether or not. Here, the flag IFF is "1".
The calculated values from the previous time to the previous time will be in the focusing zone
Then, the calculated value ΔLn-1 of the previous time and the calculated value ΔL of this time are averaged.
The average value, that is, ΔLn = (ΔL + ΔLn-1) / 2 is calculated.
Nawara (No.247), focus zone data is added to the register IZR.
Zw (> ZN 2) was set as the data (No.248)
Afterwards, the step moves to No.250. This is each measurement
There are variations in the fixed value, and once you enter the focusing zone
The width of the focusing zone is expanded and it is determined that the subject is in focus.
Increase the probability, the lens position is near the boundary of the focusing zone
This is to prevent flickering of the display at the time. On the other hand, N
If the focus flag IFF is "0" in step o.246,
The measured value ΔL this time is ΔLn (No.249), No.250
Go to step. In case of No.250 step, | ΔL
n | <(IZR), that is, is the calculated value within the focusing zone?
Determine whether Here, we know that it is in the focusing zone.
When separated, the focus flag IFF is set to "1" (No.251
), The focus indicator is displayed by the light emitting diode (LD 1).
Then (No. 252), the process moves to the step of No. 258. one
On the other hand, if it is determined that the object is out of the focusing zone, ΔLn>
It is determined whether or not it is 0 (No. 253), and if ΔLn> 0, it is issued
Front pin display by photo diode (LD 0), ΔLn <0
If it is (LD 2), the rear pin display is performed. Then focus
Set the flag IFF to “0” and set the data ZN 2 in IZR.
Set No.258 and move after the step. No.258
Check whether the input terminal (i14) is "High" at the step.
Separately, if you switch to AF mode with "High",
G FPF to "1", IFF to "0", LCF to "0"
Then, go to No.2 step, and again in "Low" to switch to FA mode.
If so, go back to No.2 step and take the next measurement.
Make a decision. In steps after No. 25, AF and FA modes are selected.
The focus detection operation is not stopped and the initial state setting operation is
To be done. First, it is impossible to interrupt (No.25), the terminal
A pulse is output to (O11) to force the CCD integration operation.
Is stopped (No. 26) and terminals (O12) and (O13) are set to "L".
The motor (MO) is stopped as "ow" (No.27), and output
Power port (OP 0), (OP 5) is output as "000"
Photodiodes (LD 0) to (LD 5) are turned off (No.
28), the terminal (O16) is set to "Low", and the power supply line (V
The power supply from F) is stopped and the terminal (O30) is set to "L".
Transmission of focus signal to microcomputer (MC 2) is stopped as "ow"
It is stopped (No. 32). In addition, flags ENF, IFF, I
"0" in FF 1 and LCF 3 and "1" in flag FPF
It is set (No. 29 to 31, 33). In this way, my
The controller (MC 1) stops operating or switches to FA mode.
No.2 after the initial settings for when
Return to step. Now, as mentioned above, the lens fits in step No.127.
Determine that the focus position has been reached and return to step No.2.
When the measurement is performed again, the flag IFF is "1".
Then, the same flow as in the case of confirming the focus is followed and the No. 91 scan is performed.
It comes to Tep. Step No.91 and Step No.92
In between, the flag IFF 1 determines whether the flag is "1".
A step (No. 305) is provided and the flag IFF 1
If "0", go to step No.92, if "1", go to step No.306.
Go to step. Flag IF in step No.306
Since F 1 is “1”, in step No. 306
Reads the data from the input port (IP 2). here
Then, between the step of # 30 and the step of # 31 in FIG.
Outputs the aperture value Av for exposure control from the I / O port
Step # 80 is provided, and this aperture value is the decoder
(DEC) output terminal (an + 2)
Latched in the latch circuit (LA 1). Therefore, the input port
Data for the aperture value for exposure control is input to the camera (IP 2).
Be done. The read data Av is converted into FNo. (No.307
), The step of No.308 is ΔD = δ × FNo.
Done. Where δ corresponds to the allowable blur diameter
The value, ΔD, is a value corresponding to the depth of focus. Next, this time
Defocus amount obtained in step No. 91 in the flow
| ΔL | and ΔD are compared in the step of No.309, and
Go to No.270 step after displaying the in-focus state below.
It If | ΔL | ≦ ΔD, then measure at that time.
The part of the subject that is
Output "010" signal to the gate (OP 5) and
The light emitting diode (LD 4) of the
Be played. On the other hand, if | ΔL |> ΔD, is ΔL positive?
Output "100" to (OP 5) depending on whether it is negative
To turn on the light emitting diode (LD 3) to display the front pin
Is performed or outputs "001" and emits light.
The LED (LD 5) is turned on to display the rear pin. If you perform this kind of operation, the AF mode
After the lens reaches the in-focus position with, move the lens to the in-focus position.
The depth of focus is the area other than the area where the
Whether it is within the limit, or whether the front pin is the rear pin
It is very easy to use and you can check
It In addition, calculate the accurate depth of focus in the step of No.308
However, the measurement position may be
It is difficult to match the part exactly, and ΔL
Since the calculated values also vary, it is the same as in the FA mode described above.
Widen the focus zone, or once enter the focus zone
After that, widen the focusing zone and average the calculated data several times.
Value processing may be performed to improve accuracy.
Yes. For example, to widen the width of the focusing zone, ΔD = 1 × δ
The calculation of × FN0 (1 = 2 to 3) may be performed. When this microcomputer (MC 1) stops operating
Initial setting, initial setting when switching to FA mode
For this reason, the steps of No.33, No.273, and No.2
The following steps are inserted between
It That is, the flag IFF 1 is set to “0” (No. 274),
"000" is output to the output port (OP5) to emit light.
Turn off the lights (LD 3), (LD 4), (LD 5)
(No. 275), set the output terminal (O30) to “Low” (No.
276). In addition, even after the photometric switch (MES) is opened,
In order to have the display operation of the modification performed at a certain time,
Input terminal (i 5) for step and step # 39
A step (# 81) for determining the state is inserted. Measurement
Then, the metering switch (MES) is opened, and in AF mode
Even if it is determined that there is, the input terminal (i 5) is
"And the microcomputer (MC 1) has the above-mentioned depth of focus.
Output if it is in
Do not set the terminal (O1) to "Low", leave it "High"
I'll do it. FIG. 11 shows the control circuit (CO for the CCD (FLM) of FIG.
It is a circuit diagram which shows the specific example of T). Counter (CO24)
Is the clock pulse (CP) from the counter (CO22)
The falling edge of the divided pulse (DP 2) is counted,
Depending on the output signals (p0) to (p4) of this count (CO24)
Then, the decoder (DE20) has output terminals (T0) to (T0).
Output the "High" signal to 9). This counter (C
O24) output, decoder (DE20) output and flip
Flop (FF22), (FF24) (FF26), (F
Table 7 shows the relationship between F28) and the Q output. As is clear from Table 7, flip-flops (FF
The output of the counter (CO24) is the Q output (φ 1) of 26).
"High" between "11101" and "00101", flip flow
Up (FF24) Q output (φ 2) is from "00100" to "101
"High" during 11 ", Q of flip-flop (FF22)
Output (φ3) is "High" between "10110" and "11110"
Becomes The output signals (φ 1), (φ 2), (φ 3) are
CCD while power is being supplied from the power line (VF)
(FLM) of the analog signal in the transfer gate
Transfers are always taking place. By this operation,
The accumulated charge remaining in the transfer gate is also discharged.
It Power-on reset circuit (PO
Reset signal (PO 2) from R 2)
Up (FF20) ~ (FF28), (FF32), D flip
Flop (DF20), (DF22), (DF24), coun
(CO20), (CO22), (CO24) are reset
It Furthermore, the flip-flop (FF30) is set.
Q output becomes "High". This output signal (φR)
More analog switch (AS 2) conducts, and constant voltage source
The output potential of (Vr1) is CCD via the signal line (ANB).
(FUM), and this potential is applied to the CCD (FLM).
The site of the charge storage unit is set. Integrate operation from the output terminal (O10) of the microcomputer (MC 1)
When the "High" pulse for starting is output,
Flip-flop via one-shot circuit (OS18)
(FF30) is reset and the terminal (φR) goes to “Low”
Become. As a result, the CCD (FLM) receives the light from each light receiving unit.
Accumulation of charges according to the amount of light is started. Also the inverter
Analog switch (AS 1) conducts via (IN50)
Then, the monitor output of the CCD is connected from the terminal (ANB).
Input to the (-) terminal of the palletizer (AC 1). Charge storage
CCD monitor output from the terminal (ANB) according to the product
The potential drops from Vr1 to the potential of the constant voltage source (Vr2).
When it reaches, the output of the comparator (AC 1) is "High".
Flip to. This completes the storage of CCD (FLM)
That is detected. One-shot circuit with this inversion
(OS10) outputs “High” pulse, and turns
The flip-flop (FF20) is connected through the road (OR20).
Is set. The "High" signal of this Q output is
At the falling edge of 1), to the D flip-flop (DF20)
It is taken in, and the counter is turned on by the high level of its Q output.
The reset state of (CO20) is released and the AND circuit (A
N60), (AN64, (AN66), (AN68) are enabled
It will be in a ru state. After the terminal (φ 1) rises to "High", the terminal (T
0) becomes "High", flip-flop (FF28)
Is set by "High" of terminal (T 0),
It is reset by "High" of (T1). This Q output
The force is from the terminal (φT) via the AND circuit (AN68).
It is sent to CCD (FLM) as “High” pulse,
With this signal, the accumulated charge is transferred to the transfer gate. further,
This (φT) signal is the interrupt terminal of the microcomputer (MC 1)
Send it to (it) and the microcomputer (MC 1) is the above CCD
The operation of fetching the output data of (FLM) is performed. When this terminal (φT) falls to "Low"
Flick flop (FF32) through the circuit (OS16)
Is set, and the AND circuit
Flip-flop after the gate of (AN68) is closed
The "High" signal from the Q output of (FF28) is not output.
Yes. One-shot circuit (OS16), OR circuit (O
The flip-flop (FF30) is set via R32).
Then, the terminal (φR) is set to "High" again. CCD by transfer signals (φ 1), (φ 2), (φ 3)
The accumulated charge is sequentially output from (FLM) from the terminal (AOT).
This charge is generated while (φ 2) is "High".
Has been output to. Therefore, the D flip-flop (DF
When the Q output of 20) becomes “High”, (φ 2) becomes “High”.
Within the period of "h", turn the terminal (T 4) to "High".
More sample and hold signal (φS) is AND circuit
From (AN66) and by "High" of terminal (T 5)
The signal (φA) for starting A-D conversion is the AND circuit (AN6
It is output from 4). Also, send the data from the CCD (FLM) terminal (AOT) first.
The accumulated charge signal that is received is for offset adjustment.
Therefore, only the charges corresponding to the leak of the light receiving part are accumulated.
And is almost equal to the output potential of Vr1.
Has become. At this time, the D flip-flop (DF24)
Output is "High", sample hold
Signal (φS) is summed through AND circuit (AN70)
Offset adjustment provided to the hold circuit (SH 1)
Potential for the CCD (FLM) from the terminal (AOT)
Are stored in the sample hold circuit (SH 1). the first
D due to the fall of the sample hold signal (φS)
The Q output of the flip-flop (DF24) is "High".
Therefore, the subsequent sample and hold signal (φS) is AND
Sample and hold circuit (SH 2) via line (AN72)
The potential corresponding to the amount of received light after that is applied to
It is sequentially stored in the field circuit (SH 2). Q output of D flip-flop (DF20) becomes "High"
Then, the signal of (φ 3) goes through the AND circuit (AN60).
Applied to one input terminal of the AND circuit (AN62)
It D flip flow at the first fall of this (φ 3)
Up (DF22) Q output becomes "High", so twice
The pulse signal of (φ 3) after the eye is AND circuit (AN62)
To the input terminal (i10) of the microcomputer (MC 1) via
To the input port (IP 0) of the microcomputer (MC 1)
It becomes a signal for instructing data acquisition. Where D
Q output of Lipprop (DF20) becomes "High"
The first (φ 3) pulse from the AND circuit (AN60)
Is not output from the AND circuit (AN62)
As described above, the data from the first CCD (FLM) is
This is because the data is data for offset adjustment. Also,
The signal of (φ 3) is the clock input terminal of the counter (CO20).
The counter (CO20) is also given to children
Reset by Q output “High” of the pro-flop (DF20)
Of the pulse from the reset state (φ 3)
To count. This counter (CO20) is a CCD (F
Count the pulses from (φ 3) as many as the number of light receiving parts of (LM).
The carry terminal (CY) to be turned on is set to "High". Sample hold circuit (SH 2) after the second time
The output data of CCD (FLM) is based on the signal (φS).
Are held and the resistors (R 1), (R 2), and
A sample circuit is created by a subtraction circuit consisting of a pair amplifier (OA 1).
Difference between the output of the field circuit (SH 1) and the output of (SH 2)
Is calculated and the analog input terminal of the AD converter (AD)
Given to. A-D converter (AD) is the signal of (φA)
Operation is started by the clock pulse from the counter (CO22).
A-D conversion of this input data based on the rule (DP 1)
To do. Here, the output of the constant voltage source (Vr1) is changed to Vr1 and leak.
Let Vd be the voltage drop due to this and Vl be the voltage drop due to the amount of light received.
Then, the output of the sample hold circuit (SH 1) is Vr1−
Vd, the output of the sample hold circuit (SH 2) is Vr1−
It is Vl-Vd. Therefore, the output of the subtraction circuit is V
The signal component is only the amount of received light, l. A-
The D converter (AD) is high-speed like the successive approximation type.
A type of A / D conversion is desirable. A-D conversion of all data from CCD (FLM)
When it is finished, the carry terminal (CY) of the counter (CO20)
It becomes "High". This allows the one-shot circuit (O
S14), a flip-flop via an OR circuit (OR22)
(FF20), (FF32), D flip-flop (DF2
0), (DF22), (DF24) are reset and D
The Q output of the flip-flop (DF20) becomes "Low".
The counter (CO20) is reset and the terminal (O
Return to the state before the "High" pulse was input from 10).
Go home. In addition, the integration time is set by the timer of the microcomputer (MC 1).
It is determined that the voltage has exceeded a certain level, and the terminal (O11) receives "H".
When a "igh" pulse is input, the rising edge of this pulse
One shot circuit (OS12), OR circuit (OR
Flip-flop (FF20) is set via
It Therefore, after that, the output of the comparator (AC 1)
The same operation as when inverted to "High" is performed,
CCD (FLM) output data is A-D converted and myco
Are sequentially output to the input port (IP 0) of the port (MC 1)
It FIG. 12 is a modified example in which a part of the circuit diagram of FIG. 11 is modified.
If the output data from the CCD is small, the microcomputer
After importing data into (MC 1), double that data
The operation to perform is the software in the microcomputer (MC 1) (N in Fig. 8).
What was done in steps 78 to 82) was converted to AD
It was done by hardware before doing. If the terminal (φR) is "High", the constant current source (CIS),
The potential Vr1 formed by the resistors (R10) to (R13) is the CCD (F
LM) of the CCD (FLM) during "Low"
Monitor output of comparator (AC10) ~ (AC12)
(-) Input terminal. And the integration progresses
When the output of the inverter reaches the potential of Vr2, the comparator (AC
The output of 12) becomes "High" and the one-shot circuit (O
The "High" pulse is output from S10).
Flip-flop via OR circuit (OR20)
After (FF20) is reset, the same operation as above is performed.
Nau. Furthermore, this pulse is a D flip-flop (DF32) ~
It is given to the clock terminal of (DF38). At this time,
Since the output of the comparator (AC12) is "High", D
The Q output of the flip-flop (DF38) becomes "High",
The analog switches (AS48) and (AS38) become conductive.
Here, the values of resistors (R30) to (R40) are R30 = R40 = R38
= 48 = R36 / 1.5 = R46 / 1.5 = R34 / 2 = R44 /
2 = R32 / 2.5 = R42 / 2.5 =
R30 due to conduction of log switches (AS38) and (AS48)
= R40 = R38 = R48, so is it an operational amplifier (OA10)?
The Vl signal is output as it is. On the other hand, when the CCD output has low contrast and the longest integration
When the output of the comparator (AC12) does not reverse within the interval
Is a signal from the output terminal (O11) of the microcomputer (MC 1)
From the one-shot circuit (OS12) to the OR circuit (OR
"High" pulse is output via 20) and at that time
Monitor output of Vr2 to Vr3, Vr3 to Vr4, Vr4 to Vr1
The exclusivity depending on whether it is between
Boua circuit (EO 4), (EO 2), inverter (IN
52) through the D flip-flops (DF36), (DF3
4), one of the Q outputs of (DF32) becomes "High"
, Analog switches (AS36), (AS4)
6), (AS34), (AS44), (AS32), (AS4
2) becomes conductive. Therefore, the integration is forcibly stopped and
1.5Vl, 2Vl, depending on the monitor output at
A 2.5Vl signal is output from the amplifier (OA10)
It FIG. 13 shows the microcomputer (MC 1) shown in FIGS.
A variation of operation is shown, and measurement is performed once focus is detected.
Floater when out-of-focus is detected continuously in the result
The main part of the No. 130 and No. 138 steps are shown.
A step related to flag IFF 2 is inserted between
Has been. That is, the focus of the lens can be adjusted to the focusing zone.
If the end flag ENF is "0" (No. 13
0), flag IFF 2 is "1" at step No.351
It is determined whether or not. Here, the flag IFF 2 is “0”
If so, set this flag IFF 2 to "1" and
Move to step and perform measurement for confirmation again. one
On the other hand, if the flag IFF 2 is "1", measurement for confirmation
The result is that it is out of focus (| ΔL | ≧ ZN 1) twice in a row.
In this case, the flags IFF and IFF 2 are set to
Set it to “0”, set the flag FPF to “1”, and
After shifting to the step, the focus adjustment operation is performed again.
In addition, between the step of No.33 and the step of No.2.
Between the steps of No.240 and No.241
To reset each flag IFF 2 to return to the initial state
Steps (No. 34, No. 241) are provided. FIG. 14 shows the steps of No. 100 in FIG.
It is a specific flow of the steps to determine whether the strike
It First, set the contents of register C to "0" (No.370
), And the register i is set to "1" (No.371). Then i
Of the difference between the outputs ai and ai + 1 of the 1st and i + 1st photodetectors
The value obtained by adding the contents of register C to the absolute value | ai-ai + 1 |
It is set in register C (No. 372) and in this register i
1 is added (No. 373), and the contents of this i and n (n is the reception
(The total number of optical elements) is compared (No. 374).
If i <n -1, return to step No.372.
Then, the absolute values of the differences are sequentially accumulated, and when i = n -1
Move to step No. 375. That is, No. 375
The contents of register C at the time of transition to
+ | A2-a3 | + | a3-a4 | + ... + | an-2-an-1 | + | an
-1−an |
It is a value indicating the last. No.375 steps
Determines whether this value is greater than the constant value CD.
If (C)> CD, the contrast is sufficient, so N
Move to step o.101, and if (C) ≤ CD, low control
Since it is the last, move to step No. 105. It should be noted that the detection of the focus adjustment state is detected by the output of the two series of light receiving elements.
In contrast, if one of the series is
It is enough to use force. Also, the contra of the subject
The data that can be associated with the
If you can find it in the process of calculating the
Store the data and check whether it is below a certain value.
The contrast is determined by determining whether or not
You may ask. The circuit section of the automatic focusing camera system in FIG.
Figure 2 shows the case where most operations are performed by the microcomputer.
The explanation has been given based on Fig. 14, but the above operation is
Even with digital circuits that combine physical elements and arithmetic circuits
realizable. One embodiment of such a case is shown in FIG.
It will be described with reference to FIG. FIG. 15 shows the circuit of FIG.
FIG. 16 is a circuit diagram physically shown, and FIG. 16 is a circuit diagram of FIG.
Timing signals that generate signals to control the operation of
It is a circuit diagram which shows a generation circuit. First, the timing of Figure 16
The configuration and operation of the trigger signal generation circuit will be described below. Su
The switch (193) is the entire circuit section shown in Figs. 15 and 16.
Is a switch that is closed to start the operation of
The closing signal of the switch is the microcomputer (MC 1) shown in FIG.
For the "High" level signal given to the input terminal (i11)
Correspond. Inverter when switch (193) is closed
The output of the computer (194) becomes "High", and one shot
A pulse is output from the circuit (196). This pulse is
The entire circuit section from the output terminal (τ 0) of the OR circuit (198)
Is output as a signal for setting the initial state of. Also, the pulse from the one-shot circuit (196) is
A circuit (199) output terminal (τ 1) to CCD (FL
M) integration operation and data reading circuit (LDC) reading
It is output as a signal for starting the operation. Furthermore,
The pulse from this output terminal (τ 1)
(201), AND circuit (202), counter (20
3), one-shot circuit (204), OR circuit (20
0) to the first pulse generating circuit. First
The pulse generation circuit of the first pulse generator in response to the generation of this pulse.
The counting of time is started and the data reading described later in Fig. 15 is started.
After the time required for the circuit (LDC) to read the data has elapsed
Pulse from the carry terminal (τ 2) of the counter (203)
Is output. The pulse from this output terminal (τ 2)
Lip flop (206), AND circuit (207),
Unta (208), one-shot circuit (209), OR
Given to the second pulse generation circuit composed of the circuit (205).
Be done. This second pulse generation circuit generates this pulse.
In response to the start of counting the second predetermined time,
Counter after the time required to calculate K and Ni
Output a pulse from the carry terminal (τ 3) of (208)
It This pulse is the AND circuit (222), OR circuit
First pulse generating circuit via (223) and (199)
To the counter (203), and the counter (203) starts counting.
Be started. Here, the AND circuit (222) is an OR circuit
The gate is opened when the output of (192) is "High".
The output of the OR circuit (192) is "H".
igh ”, pulse from terminals (τ 1) to (τ 3)
Are repeatedly output in sequence. The pulse from the output terminal (τ 3) is connected to the AND circuit (21
0) through flip-flop (212), and
Path (213), counter (214), one-shot circuit
(215), third pulse consisting of OR circuit (211)
It is given to the generation circuit. And circuit (210) is or
The gate opens when the output of the road (192) is "Low".
This causes the third pulse generation circuit to
In response to the occurrence of the
A correction calculation circuit (174) described later in the figure requires correction calculation.
The carry terminal of the counter (214) after the elapse of time
Output pulse from (τ 4). From the output terminal (τ 4)
Pulses of flip through the AND circuit (216)
Flop (218), AND circuit (219), counter
(220), one-shot circuit (221), OR circuit
Given to the fourth pulse generator circuit (217)
It The AND circuit (216) is the output of the OR circuit (192)
Is "Low", the gate is opened, which causes the fourth
The pulse generation circuit of is in response to this pulse generation.
Start counting for a fixed time, and after the elapse of this predetermined time,
Outputs a pulse from the carry terminal (τ 5) of the controller (220)
To do. This pulse is AND circuit (226), OR circuit
First pulse generating circuit via (223) and (199)
Be returned to. Here, the AND circuit (226) is OR
The gate opens when the output of the road (192) is "Low".
The output of the OR circuit (192) is
In the case of “Low”, the pulse from terminals (τ 1) to (τ 5)
Are sequentially output. From the timing signal generation circuit shown in FIG. 16 above
The operation of the circuit section in FIG. 15 is controlled according to the pulse,
However, the configuration and operation of the circuit part will be described below.
First, by closing the switch (193) in FIG.
A pulse is output from (τ 0).
15 flip-flops (149), (160), (1
70) and (171) through the OR circuit (148)
Flip-flops (137), (151)
Via the circuit (117) and the one-shot circuit (118)
The flip-flops (119) are reset.
It In addition, the flip-flops (137) and (151)
When reset, the output of the OR circuit (152) becomes "Low"
D flip-flops (135), (139) and
And T flip-flops (132) and (138) are reset.
Is reset and the flip-flop (160) is reset.
T flip-flop (141), D flip-flop
(142) is reset. Also, in FIG.
The pulse from the terminal (τ 0 goes through the OR circuit (199)
From the terminal (τ 1) to the first pulse generation circuit
Set the flip-flop (201). This set
Resets the counter (203).
The clock pulse from the oscillator (224)
Start operation. At the same time, the data reading circuit (L
DC) is the lens circuit by the pulse from the terminal (τ 1)
The operation of reading the conversion coefficient KL from (LEC) is started.
In addition, the signal processing circuit (106) is connected to the terminal (τ 1)
The pulse starts the CCD (FLM) light reception integration operation.
Let In Fig. 16, the pulse is output from the terminal (τ 1)
When the time required to read the above data KL has elapsed,
Pulse from the carry terminal (τ 2) of the counter (203)
Will output. One shot in response to the falling edge of this pulse.
The output circuit (204) outputs a pulse, and the OR circuit (20)
0) reset the flip-flop (201)
Stop the counting operation of the counter (203). Well
Also, the pulse from the terminal (τ 2) is the second pulse generation circuit.
The counter (208) is the oscillator (224).
The clock pulse counting operation is started. simultaneous
From the pulse from the terminal (τ 2)
(112) is the output from the fixed data output circuit (111).
Conversion coefficient KB and data reading circuit (LDC) in camera body
Multiply with the conversion coefficient KL of the shooting lens from
The conversion coefficient K = KL · KB of the entire system is calculated. Well
In addition, by the pulse from the terminal (τ 2)
The path (110) is the calculated value K in this multiplication circuit (112).
And the focusing width ZN from the fixed data output circuit (105)
Multiply by the number of rotations N of the motor corresponding to the width of the focus area
i = K · ZN is calculated. In Fig. 16, the pulse is output from the terminal (τ 2)
The time required to calculate the above data K and Ni has elapsed
From the carry terminal (τ 3) of the counter (208).
Ruth outputs. In response to the falling edge of this pulse
The output circuit (209) outputs a pulse, and the OR circuit (2
Reset flip-flop (205) via 05)
Then, the counting operation of the counter (208) is stopped.
At this time, if the output of the OR circuit (192) is "Low"
For example, the gate of the AND circuit (210) is opened and the terminal (τ
The pulse from 3) passes through the AND circuit (210) to the third
To the pulse generation circuit of the counter (214).
The counting operation of the clock pulse from the shaker (224)
Start. Also, the pulse from the terminal (τ 3)
The multiplication circuit (113) in FIG. 15 is the signal processing circuit (106).
Defocus amount from terminal (w) | ΔL | and multiplication circuit
For focus, multiply by the calculated value K from (112)
The motor required to drive the lens (FL) to the in-focus position.
The number of rotations of the turbine N = K · | ΔL | is calculated. The correction calculation circuit (114) is used when the motor (MO) is stopped.
Is the calculated value from the multiplication circuit (113) as it is,
When the motor rotates, the following correction calculation is performed and the calculated value
Are output as output data Nm. (This time
The operation of the path (114) is No. 140 to No. 16 in FIG.
Corresponds to the flow of step 2. ) That is, the motor times
At the time of turning, the period required for integration and calculation from the previous data Nm '
The data (τ + t0) corresponding to the motor rotation amount between
Data Nm '-. Tau.-t0 = Nm "and the current data
Data N that N is assumed to have been obtained at the intermediate point of integration
− (Τ / 2 + t0) = N ′ is calculated. With these this time
The average value (N '+ Nm ") / 2 = Nm of the previous data is complemented.
From the correction calculation circuit (114) as corrected data Nm
Is output. Where τ = ECD 1-ECD 2, to = E
CD2-ECD3, and ECD1, ECD2, ECD
3 are terminals (τ 1), (τ 2), and (τ
3) Presettable when the pulse is output from
This is the output of the down counter (115). In Fig. 16, the pulse input from the terminal (τ 3)
After the time required for the correction calculation has elapsed, the counter (21
4) outputs a pulse from the carry terminal (τ 4). This
One-shot circuit (21
5) outputs a pulse and outputs a pulse via the OR circuit (211).
Reset the flip-flop (212) to the counter (2
The counting operation of 14) is stopped. At this time, or
When the output of the line (192) is "Low", the terminal
The pulse from (τ 4) goes through the AND circuit (216)
The counter (220) is provided to the fourth pulse generation circuit.
Is the counting motion of the crop pulse from the oscillator (224)
Start the work. In addition, the pulse from the terminal (τ 4)
In the down counter (115) of FIG.
The data Nm from (114) is preset. simultaneous
This pulse causes flip-flop (170) to
AND circuit (166), (168), (16
The gate of 9) is opened. At this time, the signal processing circuit (1
Signal indicating the defocus direction from the terminal (v) of 06)
Is a "High" level, the AND circuit (165),
The front pin table is displayed on the display unit (180) via (166).
If the level is "Low", the AND circuit (16
7), (169) through the display (182)
Pin indication is made. In Fig. 16, the position from the pulse input from the terminal (τ 4)
The counter (220) is a carry terminal after a lapse of a fixed time.
Output pulse from (τ 5). In response to this pulse
The one-shot circuit (221) outputs a pulse and turns
The flip-flop (218) via the path (217).
Set and stop the counting operation of the counter (220).
Let The pulse from the terminal (τ 5) is the AND circuit (22
6), terminal via OR circuit (223), (199)
Given to (τ 1) and the same as the above, the product of CCD
Minute, data KL reading, calculation, correction calculation, data Nm
Operations such as setting and motor drive are repeated in sequence. Also, the terminal
Flip-flop of Figure 15 by pulse from (τ 5)
(171) is set and AND circuits (172), (1
73) is opened and the end of the signal processing circuit (106)
AND circuits (172), (1) depending on the level of the child (v)
One of the outputs of 73) becomes "High". By this
The motor control circuit (MDR) is a motor (MO)
Rotate clockwise or counterclockwise. This motor
-(MO) rotation, slip mechanism (SLP), transmission
Transmission to the camera-side coupler (102) via the structure (LDR)
To be done. The rotation of this camera side coupler (102) is the lens
Foam coupler (101), drive mechanism (100)
Focus lens is transmitted to the lens
(FL) moves toward the in-focus position. The encoder (ENC) is connected to the transmission mechanism (LDR).
The rotation amount of the transmission mechanism (LDR) (that is, the focus
The number of pulses according to the amount of movement of the lens (FL) for scanning
Next output, and this pulse causes down counter (115)
The data Nm preset to is reduced. Also, the 16th
Flip-flop by pulse from terminal (τ 5) in the figure
When (119) is set, is the encoder (ENC)
These pulses are one-shot through the AND circuit (120).
Circuit (121). This one shot circuit
Pulse from (121) and flip-flop (11
The output of 9) is a capacitor via the OR circuit (123).
Given to the discharging transistor (155) of (156)
It The transistor (155) is a one-shot circuit (1
21) at the time of pulse output from the flip-flop (1
19) It conducts at the time of resetting and the capacitor (156) is connected.
To discharge. Here, the pulse from the encoder (ENC)
Capacitor (15
6) and the resistance (157)
It Also, from the pulse output from the terminal (τ 3)
The period from 5) to pulse output is very short.
This is because the amount of motor rotation during the period is negligible.
The above correction calculation is not performed by the motor rotation during
Yes. The comparison circuit (130) is a terminal of the signal processing circuit (106).
Defocus amount | ΔL | from (w) and data output circuit
By comparing with the focus width ZN from (109), | ΔL | ≦ Z
When it is N, the output is set to "High". One shot circuit
(136) outputs a pulse in response to the rise of this output
Then, the flip-flop (137) is set. Comparison times
The path (116) is the focus area from the multiplication circuit (110).
From the motor rotation amount Ni and the down counter (115)
Is compared with the count value ECD of and output when Ni ≧ ECD
To "High". The one-shot circuit (150)
A pulse is output in response to the rising edge of this output, and the flip
Set the flop (151). flip flop
The Q outputs of (137) and (151) are both OR circuits (1
52), (163) and the inverter (164).
Are supplied to the end circuits (172) and (173). Obey
, .DELTA.L | .ltoreq.ZN or Ni.gtoreq.ECD,
It is determined that the flip-flops (137) and (151)
When the output becomes "High", the AND circuit (172),
The gate of (173) is closed and the motor control circuit (MD
R) stops driving the motor (MO). At the same time
The D flip-flop (13
5), (139), T flip-flop (132),
The reset of (138) is released. In this way, the next cycle of the cycle in which focus is once determined is determined.
In the control unit, the comparison circuit (130) determines the in-focus state.
And a pulse is output from the terminal (τ 3)
Comparing circuit at this time by the paths (131) and (134)
The output of (130) is transferred to the D flip-flop (135).
Be cut. Then, in response to the fall of the terminal (τ 3), T
The output of the flip-flop (132) is inverted and ANDed
The gates of roads (133) and (134) are opened,
To be closed. In-focus state is determined in the next cycle
And a pulse is output from the terminal (τ 3)
Comparing circuit at this time by the circuits (131) and (133)
The output of (130) is transferred to the D flip-flop (139).
Be cut. In this way, once the focus is determined
Then, the in-focus state is determined twice. OR circuit (14
4) is the D flip-flop (135), (139)
The output is used as input, and the smallest of these two focus determinations
If the output is in focus at least once, the output is "High
In addition, if it is not in focus both times,
The output becomes "Low". The output of the AND circuit (133)
The output of the T flip (138) due to the fall of force is "L".
and the gate of the AND circuit (131) is closed.
It By the way, at least one of the above two focusing determinations is successful.
If it is rushed, the gate of the AND circuit (146) opens.
In response to the pulse from the terminal (τ 4)
(149) is set. This set
The outputs of the circuit (143) and the AND circuit (168) are "Hig.
h ”, and AND circuits (165), (166), (1
67) and (169) output becomes “Low”, and the display
At (181), the focus display is made. On the other hand, twice
If it is out of focus, use the inverter (145)
The gate of the AND circuit (147) is opened and the terminal (τ 4)
In response to a pulse from the OR circuit (148).
Lip flops (137) and (151) are reset
It The output of the OR circuit (152) by these resets
Becomes "Low" and the D flip-flop (135),
(139), T flip-flops (132), (13
8) is reset. Also, the AND circuit (172),
The gate of (173) is opened, and the motor control circuit (M
DR) restarts the drive of the motor (MO). Next, the focus lens (FL) is closest or infinite
Even if the far end position is reached, the comparison circuit (130) can focus the image.
The operation when it is not determined will be described below. in this case,
Even if the motor (MO) is rotating, the transmission mechanism (LD
Since the mechanism after R) is forcibly stopped rotating,
No pulse is output from the coder (ENC). Obey
Output from the one-shot circuit (121)
The star (155) will not conduct in a pulsed manner,
Constant determined by capacitor (156) and resistor (157)
After a lapse of time, the output of the switching circuit (158) becomes "High".
", That is, the arrival at the end is detected.
In response to the rise of force, the one-shot circuit (159) is
Output a ruth and set the flip-flop (160)
It With this set, the OR circuit (163) and the inverter
AND circuits (172) and (173) through (164)
, The gate is closed and the motor control circuit (MDR) is
Rotation of the motor (MO) is stopped. At the same time, T flip
Flop (141), D flip-flop (124),
(The reset of 142 is released. Also, the OR circuit (1
63), (117) through one shot (118)
Output a pulse and reset the flip-flop (119).
And then keep the transistor (155) conductive.
To do. In the next cycle, pulse from terminal (τ 3)
Is output by the AND circuit (140),
The output of the comparison circuit (130) of the D flip-flop (1
42). Also, a signal processing circuit (106)
The signal in the defocus direction from the terminal (v) of
It is latched in the flip-flop (124), and
Display unit through circuit (125) and OR circuit (127)
The front pin display at (180) or (182) or
Rear pin display is made. Now, of the flip-flop (149) or (160)
When the output becomes "High", the output of the OR circuit (192)
Becomes "High", and the gate of the AND circuit (226)
However, the AND circuit (2
The gates 10) and (216) are closed. By this
From the terminals (τ 3) and (τ 4)
The transmission of pulses to the live circuit is interrupted. At this time, Ann
Since the gate of the drive circuit (222) is open,
The pulse from (τ 3) is the AND circuit (222), or
Given to terminal (τ 1) via paths (239) and (199)
After that, CCD integration, data KL reading, calculation
Only the operation is repeated. In addition, the switch (190)
With a switch that is closed when performing focus adjustment by movement
Yes, the closing of this switch causes the output of the OR circuit (192).
The force is always "High", and after and after the focus detection described above
Only the same operation as that after the end detection is executed. Now, in FIG. 17, the decoder (235) is shown in FIG.
Of the output of the OR circuit (192) of the
The signal from the signal processing circuit (106) in FIG.
One of terminals (p0) to (p6), depending on the
Set one to "High". The multiplication circuit (233) is shown in FIG.
Data output circuit by the pulse from the terminal (τ 2) of
Data δ corresponding to the allowable blur diameter from (232)
Multiply by the absolute aperture value F from the decoder (231),
The depth of focus ΔD = δ × F at the aperture value is calculated. here
Then, the decoder (231) is connected to the aperture data output circuit (23
0) Output of set aperture or calculation aperture
It is a circuit that converts the scan value Av into an absolute aperture value. Comparison circuit
(234) is the calculated depth of focus ΔD and
Defocus amount | ΔL | from the signal processing circuit (106)
Is compared with, and the output is “High” when ΔD ≧ | ΔL |
AND circuits (241), (243), (24
4), (246) and (248) are opened. on the other hand,
The comparison circuit (234) outputs the output when ΔD <| ΔL |
Set to "Low" and circuits (240), (242),
Open the gates of (245) and (247). Therefore, the terminal
When (p0) is "High", the display means (250)
Any one of the children (p1), (p2), (p4), (p5)
When the output of the comparison circuit (234) is "Low" at "High"
If the display means (251), (25
2), (253), (254), the terminal (p6) is
In the case of "High", each display means (255) displays
Take action. In addition, any of terminals (p1) to (p5)
One of them is "High" and the output of the comparison circuit (234) is "H".
In the case of "igh", the display means (260) corresponding to the above terminal
1 to (264) each perform a display operation. These display means, as shown in FIG.
On the lower outside of the frame (270), the display means (260) or
Two groups in (264) and (250) to (255)
Separated and arranged vertically. Display means (260)
Through (264) are both light emitting dies for green light emission
The subject that is in the dead position and is located in the distance measuring frame (271)
By illuminating that the imaging position of the body part is within the depth of focus
indicate. Also, the display means (250) to (255)
Are both light emitting diodes for red light emission.
Then, a warning is displayed by lighting that it is out of the depth of focus.
Further, the display means (180) to (18) shown in FIG.
2) is arranged outside the viewfinder frame (270)
Has been done. In addition, these display means may be composed of a lamp, a liquid crystal, or the like.
May be done. Now, the display operation by these display means will be briefly described below.
Reveal. First, the field of view (270) is compared to a relatively narrow area.
The photographer wants to focus on the corresponding distance measuring frame (271)
The orientation of the camera is determined so that the main subject comes. This
When the switch (193) is closed in the state of
The automatic focusing is performed on the
By any of the display units (180) to (182) of
Is displayed. Display means when the image forming position reaches the in-focus area
(181) lights up to show the focus display and
The movement of the lens for dust stops. After that, switch (19
3) With the camera closed, turn the camera and change the depth of focus.
The part of the subject you want to check comes in the distance measuring frame (271).
By doing so, you can check and display the depth of focus.
It That is, the output of the OR circuit (192) "High"
The decoder (235) becomes active. Confirm depth of focus
Defocus amount and direction
The data is transmitted to the decoder (2) via the signal processing circuit (106).
35) and is not connected to the terminal (p0) of the decoder (235).
Any one of the chairs (p6) becomes "High". Also,
This defocus amount | ΔL | is calculated by the comparison circuit (233).
The depth of focus data ΔD corresponding to the aperture value is compared. This
Display means according to the output of the decoder and the comparison result
Is lit, and whether the image formation position at this time is within the depth of focus
Is displayed. To confirm this depth of focus, close the switch (193).
Since you can always do it while you are doing it, change the direction of the camera
As a result, the desired depth of focus can be confirmed. Well
Also, when the focusing lens reaches the end position, the motor
Similarly, when (MO) stops rotating,
Can be confirmed. Now, by opening the switch (193),
One shot circuit (197) through the burner (195)
Pulse is output from the
Flip-flop is reset and
The ringing signal generation circuit (128) is reset, and as shown in FIG.
And the circuit of FIG. 16 ceases to operate. In addition, this operation stop
Responds to the closing of the release switch (RLS) of the camera
You may do so. Of the focus confirmation display mode shown in FIG. 17 and FIG. 18 described above.
Another embodiment will be described with reference to FIGS. 19 and 20. First
In FIG. 19, a decoder (280) is an OR circuit (19
As shown in Fig.15, the output becomes active due to the "High" output.
According to the data from the signal processing circuit (106) of
"High" any one of (p0) to (p8)
To Therefore, any "High" output is
Via OR circuits (294) to (302)
Is given to the display seed means (320) to (328).
And display according to the amount of deviation from the signal processing circuit (106).
Is done. On the other hand, to close the memory switch (290)
One-shot circuit via the inverter (291)
A pulse is output from (292), and when this switch is closed
The output of the decoder (280) is the D flip-flop (28
1) to (289). In these latches
The more stored decoder output is the OR
It is displayed by the above-mentioned display means through the circuit. Obey
In the display means (320) to (328),
Display and display of the shift amount stored when the switch (290) is closed.
There are two types of display, the display of the amount of deviation at the time.
This memory is updated each time the memory switch (290) is closed.
Be done. The D flip-flop described above is an OR circuit (19
The reset state is released by the "High" output from 2).
Be done. Further, the decoder (310) has a diaphragm data output circuit (2
Width of depth of focus determined based on data Av from 30)
Terminals (u0) to (u6) to correspond to
Selectively set to "High" with (u3) as the center. That is,
For example, when 0 ≦ Av ≦ 2, only the terminal (u3) is 2 <
When Av ≤ 4, terminals (u2) to (u4) are 4 <Av
When ≤6, if terminals (u1) to (u5) are 6 <Av
If the terminals (u0) to (u6) are "High",
Become. The display means (330) to (336) are at these ends.
It is provided to correspond to each child (u0) to (u6)
Has been. These display means (320) to (328)
And (330) to (336) are shown in FIG.
In two rows outside the viewfinder field frame (270)
Arranged and displaying means (330) to (336)
Gives a visual depth of focus corresponding to the aperture data Av.
Displayed by the display means (320) to (328)
The data of the deviation amount at the time of storage and at the present time is displayed.
That is, the imaging position of the subject located in the distance measuring field frame (271)
Position within the depth of focus or how far out
It can be easily visually discerned. Modification of the depth of focus confirmation display mode shown in Figs. 15 to 18
In another embodiment, that is, when a small number of display means are used for automatic focusing.
Fig. 21 shows an example that can be displayed when checking the depth of focus and
It will be explained based on. In the figure, the OR circuit (192)
Output is "Low" and motorized for auto focus
If the node operation is performed, the AND circuit (343) is not used.
The gate of the chair (346) is closed. Therefore,
Gates of the end circuits (351), (353), (353)
Is closed, and circuits (350), (352),
The gate at (354) is open. In this case, the 15th
Of AND circuits (166), (168), (169) in the figure
Display means (180), (181), (18) according to the output
Any one of 2) is lit and displayed. On the other hand, the
When the output of the circuit (192) becomes "High"
The gates of the roads (343) to (345) are opened.
At this time, the output of the comparison circuit (234) in FIG.
If h ″ (that is, ΔD ≧ | ΔL |), the AND circuit (34
The output of 4) becomes "High" and the AND circuit (353).
Opens the gate. Also, the AND circuit (346)
Divide the clock pulse from the oscillator (224) in Figure 16
The divided pulse from the frequency divider (342)
This divided pulse is output to the AND circuits (346) and (35
It is given to the display means (181) via 3). to this
The focus position of the subject is within the depth of focus after checking the depth of focus.
If it is, the display means (181) for focusing display blinks.
It Here, the focus state when the automatic focus adjustment operation is stopped
If the display means (180) is always on,
And the blinking of the display means (181)
The display can be distinguished when the adjustment operation is stopped and when the depth of focus is checked.
It Also, if the subject is in focus when the automatic focus adjustment operation is stopped
Is only the blinking of the display means (181).
If the display means (182) is constantly lit, the display means (1
81) blinks. In this way, the automatic focusing operation
When the depth of focus is confirmed, the focus state at stop is always lit.
By flashing the in-focus state, both are displayed simultaneously.
Therefore, the display means (180) at the time of automatic focus adjustment or
(182) can be commonly used. Effect of the Invention Focusing on a subject within a predetermined area
Once the position of the focusing lens is determined,
Focusing lens position is maintained and the above predetermined area
A display showing whether the subject is within the depth of field
Done. Therefore, it is possible to obtain a focus state for the main subject.
With the focusing lens position held,
If you place another subject in the prescribed area in the other direction,
You can check whether the subject is within the depth of field.
The composition can be determined in consideration of the depth of field.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a camera system according to the present invention, FIG. 2 is a circuit diagram showing its circuit configuration, FIG. 3 is a flow chart showing the operation of the microcomputer (MC 2) in FIG. 2, and FIG. Is a circuit diagram showing a specific circuit configuration of the serial data input unit (SDI) of the microcomputer (MC 2),
FIG. 6 is a circuit diagram showing a circuit configuration of a converter (CV) and an interchangeable lens (LE) mounted on the camera body, and FIG. 6 is a concrete example of a light emitting diode drive circuit (FAD) controlled by a microcomputer (MC 1). FIG. 7 is a circuit diagram showing a circuit configuration, FIG. 7 is a graph showing the relationship between the focal length and the conversion coefficient of a variable power lens having an optical system in which the conversion coefficient is changed according to the focal length, and FIGS. 2 Microcomputer (MC
1) A flowchart showing the operation, FIG. 11 is a circuit diagram showing a concrete circuit configuration of a control circuit (COT) controlled by a microcomputer (MC 1), and FIG. 12 is a main part circuit configuration of the modified example. The circuit diagram shown in FIG. 13 is a flow chart showing the main part of a modified example of the flow of the microcomputer (MC 1), and FIG. 14 shows the operation of the step No. 100 of the microcomputer (MC 1) in FIG. 8 concretely. FIG. 15 to FIG. 17 are circuit diagrams showing the circuit configuration of the second embodiment of the camera system shown in FIG. 2 to FIG. 14, and FIG. FIG. 19 is a circuit diagram showing a circuit configuration of a third embodiment in which the circuit of FIG. 17 is modified, FIG. 20 is a diagram showing its focus state display mode, and FIG. 21 is a circuit diagram of FIG. It is a circuit diagram which shows the circuit structure of the modified 4th Example. BD: camera body, LE: photographing lens, FL: focusing lens, FLM: focus detecting light receiving means, 106: signal processing means, 107: first focusing state determining means, 108: second
Focus state determination means, 109: depth of focus display means, 105:
Aperture data output means, MDR: drive means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuaki Akada 2-30 Azuchi-cho, Higashi-ku, Osaka-shi Osaka Prefecture Osaka International Building Minolta Camera Co., Ltd. (56) References JP-A-57-185423 (JP, A) JP-A-57-38402 (JP, A) JP-A-58-7129 (JP, A)

Claims (1)

[Claims] 1. A detection means for detecting data regarding focus adjustment for a subject within a relatively narrow predetermined area of a photographing screen, and a focusing lens is moved to a focus position for the subject based on an output of the detection means. Lens position determining means; focus lock means for holding the focusing lens at the in-focus position by prohibiting the subsequent operation of the lens position determining means in response to the completion of the operation of the lens position determining means; Whether the subject within the predetermined area is within the depth of field based on the output of the detection means and the aperture value during the operation of the focus lock means, which is started in response to the completion of the operation of the lens position determination means. An automatic focus adjusting device comprising: a display unit that repeatedly determines whether or not to display a determination result.