JPH02148027A - Camera device and interchangeable lens - Google Patents

Abstract

PURPOSE:To eliminate the need of an adjustment by a person's help whenever a lens is replaced by executing a diaphragm control in accordance with a diaphragm characteristic of an interchangeable lens on the camera body side. CONSTITUTION:In a state that a mount 16 of a lens 10 is coupled with a mount 32 of a body 30, a contact 18 is connected electrically to a contact 34. A computer 48 reads data of a memory 22, and controls the gain of an amplifier 44 and a time constant of a variable time constant circuit 46. An image of an object to be photographed passes through a photographing optical system 12, passes through a diaphragm 14 and both the mounts 16, 32, is made incident on a photographing element 36 and outputs a photoelectric converting signal. An S/H circuit 38 impresses a signal component to a signal processing circuit 40, and the circuit 40 supplies a video signal to an output terminal 42. An output of the circuit 38 is amplified by the prescribed gain by the amplifier 44, impressed to a diaphragm driving mechanism 20 through the circuit 46 and the contacts 34, 18, and controls a numerical aperture of the diaphragm 14. In such a way, the gain of the amplifier 44 and the time constant of the circuit 46 are adjusted to a value corresponding to a characteristic of the lens part 10 by the computer 48, therefore, the adjustment by a person's help each time of replacement is made unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an interchangeable lens camera device and its interchangeable lenses.

[Conventional technology]

This type of camera device, in which the lens and camera body are detachable and can use multiple interchangeable lenses, is well known in the field of video cameras as well as single-lens reflex cameras using silver halide film. . In this type of lens exchange system, the interchangeable lens consists of a photographic lens, a zoom drive section, an aperture, an aperture drive mechanism, a mount section, etc., and this mount section is mechanically coupled to a similar mount section on the camera body. This allows the interchangeable lens to be attached to the mount section of the camera body.

In addition, aperture information, such as interchangeable lenses and the camera body,
A system for exchanging control information for automatic focusing, etc. under No. 474 is known, and in such a system,
By connecting the electrical contacts of both mount parts described in 11η,
(a) Electrical connection of the lines is achieved using external cables or connectors, etc.

Note that as the interchangeable lens, for example, a plurality of types of lenses with different focal lengths, zoom ratios, and F numbers are prepared.

[Invention or problem to be solved]

However, in the conventional example described in 1-1 above, there is no problem with the mechanical, electrical, and optical coupling itself between the lens and the camera body, but there are the following problems with the aperture and its drive mechanism. There were problems like. In other words, the aperture drive mechanism uses various drive methods (for example, servo,
Various types of aperture blades are used, such as the 1000-meter type, pulse motor type, and IG meter type, and even within the same type, the number of aperture blades, their quality, motor torque, and rotational speed vary. Therefore, +′[ during control is large.

Although it is possible to standardize the DC operating characteristics, it is not only extremely difficult to standardize parts with different dynamic characteristics, but also increases the cost considerably. There is a risk that it will not be possible to distinguish between the features of the system.

Therefore, in the field of video cameras, when changing lenses, the aperture control characteristics, especially its dynamic characteristics, are manually adjusted on the camera body each time the lens is changed. For people other than the Nine Monarchs, it was practically impossible to change lenses easily.

The present invention has been made in view of the problems of the prior art as described above, and an object of the present invention is to provide a camera device and an interchangeable lens that enable easy lens exchange.

[Means to solve the problem]

Therefore, in this type of camera device according to the present invention, a memory for storing identification data for identifying the aperture characteristic is provided in the lens, and the aperture is controlled within the camera body based on the identification data. The object is to be achieved by configuring the device to adjust the characteristics.

[Effect]

In the camera body side of the present invention configured as described above, by referring to the memory in the interchangeable lens,
By knowing the aperture characteristics of each interchangeable lens and adjusting the aperture control of the interchangeable lens according to the aperture characteristics, you can easily use interchangeable lenses with various characteristics for one camera body. Manual adjustment becomes unnecessary.

〔Example〕

The present invention will be described above based on examples.

(Configuration) FIG. 1 shows a configuration block diagram of an embodiment of an interchangeable lens camera according to the present invention. 10 is a lens section, and 30 is a camera body. In the lens unit 10, 12 is a photographing optical system, 14 is an aperture, 16 is a lens mount, 18 is an electric contact provided on the lens mount 16, 20 is an aperture drive mechanism,
Reference numeral 22 denotes a memory containing data for identifying the types of the aperture 14 and the aperture drive mechanism 20.

Next, in the camera body 30, 32 indicates the lens portion 1
Compatible with mount 16 of 0. Removable mount, 3
4 faces the electrical contact 18 of the lens unit 10, and is connected to the navigation electrical contact 1 when the lens unit 10 is attached to the camera body 30.
8, 36 is a solid-state image sensor such as a CCD, 38 is a sample hole I" (S/summer) circuit for sampling and holding the output of the image sensor 36, 40 is a signal processing circuit for processing the output of the S/H circuit 38 and outputting a video signal, 42 is a video output terminal, 44 is a variable gain amplifier, 46 is a variable time constant circuit, and 48 is a micro It is a combi coater.

(Operation) When the mount 16 of the lens 10 is mechanically coupled to the mount 32 of the camera body 30, the electrical contact 18
is electrically connected to the electrical contact 34. During this electrical connection, the microcomputer 48 reads the data stored in the memory 22 and controls the gain of the amplifier 44 and the time constant of the variable time constant circuit 46.

The subject image passes through the photographing optical system 12, and after the amount of light is limited by the diaphragm 14, it passes through the openings of both mounts 16 and 32 and enters the image sensor 36. The image sensor 36 receives a photoelectric conversion signal. The S/H circuit 38 extracts the signal component and applies it to the signal processing circuit 40.The signal processing circuit 40 supplies the video signal to the output terminal 42.On the other hand, the output of the S/H circuit 38 is output to the amplifier. 44, the variable time constant circuit 46 and each electrical contact 34.18 are first amplified with a predetermined gain.
is applied to the diaphragm drive mechanism 20 via the diaphragm drive mechanism 20. The aperture drive mechanism 20 controls the aperture 14 to open 11 degrees in response to this signal. As mentioned above, the gain of the amplifier 44 and the time constant of the variable time constant circuit 46 are determined by the microcomputer 48.
The value is adjusted according to the characteristics of the lens section 10.

FIG. 2 shows a flowchart of the operation sequence of the microcomputer 48. After starting in step S1, in step S2 it is determined whether the power is on or old, and if it is off, it waits for it to be turned on. If the power is on, the data stored in the memory 22 of the lens unit 10 is read out in step S3, and it is checked in step S4 whether the data is appropriate. Suitable 1■ - Test (Y), in step S5, data suitable for the attached lens is selected from the data written in the memory in the rth microcomputer 48, and in step S6, the amplifier is adjusted according to the selected data. 44 and the time constant of the variable time constant circuit 46 are adjusted. Thereafter, in step S7, the process moves to another routine. Also,
If the read data is not appropriate in step S4 (N)
In step S8, it is determined that the lens portion 10 is not coupled or the coupling is defective, a warning of lens abnormality is displayed, and the process returns to step S3.

Even during other routines, if detachment and/or attachment of the lens unit 10 is detected in step S9, the process proceeds to step S3, and the memory 22 of the lens unit 10
is read preferentially.

FIG. 3 is a block diagram showing an example of the configuration of the amplifier 44 and the time constant circuit 46 in FIG. 1. 50
．． 52 is each operational amplifier, 54.56 is each reference voltage (power supply), 58.60 is each switch circuit, 62, 64, 66.
68.7071 is each resistor, and 72 and 74.76 are each capacitor. Each switch circuit 58, 60 is switched and controlled by the microcomputer 48, and each switch circuit 58 is connected to each resistor 64, 66, 68, . By selecting one or more of the capacitors 72, 74, 76, the gain of the amplifier 44 changes, and by selecting one or more of the capacitors 72, 74, 76 by the switch circuit 60, the time constant of the time constant circuit 46 changes. changes.

In addition, in the configuration of FIG. 3, each of the three elements r
By selecting from -, the gain and time constant are changed discretely, but it is also possible to change the gain and time constant other than three,
Furthermore, it goes without saying that the gain and/or time constant may be changed continuously.

(Other Embodiments) FIG. 4 shows a block diagram of another embodiment of the present invention, in which the same or similar components as in FIG. 1 are represented by the same reference numerals.

101 is a microcomputer on the camera body side, 102
is an A/r) converter, 103 is a microcomputer on the lens side, 104 is a D/A converter, 105
is mechanically coupled to the aperture 14, and 106 is an encoder for reading each aperture opening. 106 is an A/D converter.

As shown in FIG.
The signal is converted into a digital signal by the D converter 102 and input to the microcomputer 101 manually. The microcomputer 101 has a serial communication line, and sends and receives signals to and from the microcomputer 103 on the lens side. Then, the output of the A/D converter 102 and
Based on the signal obtained from the microcomputer 103, aperture control data is generated, and the microcomputer 103
Send to. The microcomputer 103 generates aperture drive data using the aperture control data obtained from the serial communication line and the output of the A/D converter 106, and
Outputs to A converter 104 and outputs to D/A converter 104
The aperture 14 is driven by the output. The encoder 105 converts the opening L1 angle of the diaphragm 14 into an electric signal.
The A/D converter 106 converts the data into digital (IM) data, and inputs it manually to the microcomputer 103 as described above.

5 to 7 are flowcharts of the sequence of operations of the camera body side microcomputer 101 and the lens side microcomputer 103 in FIG. 4. Also, the arrows connecting the charts of phase tI are connected by the serial signal lines mentioned above.

FIG. 5 shows electric f1. The operation sequence flowchart at the time of injection is small. Microcomputer 10 on the camera body side
1 sends an initial data request in step S12 when the power is turned on in step Sll), and in step S
13 receives the aperture operation time constant, and in step S14 sets the integral constant to 1 using a predetermined lookup table according to the aperture operation time constant, and in step S15 allows interruption by vertical synchronization Iha number V11. Then step 5
Ends at 16.

On the other hand, the lens side microcomputer 13 performs step S.
When the power is turned on in step 17, in step S18 an initial data request is received from the camera body side microcomputer 101, and in step S19, the lens data which has been written in advance in the memory of the microcomputer is received. Data on the aperture time constant that is unique or unique to the type of lens is sent out, and the process ends at step S20.

FIG. 6 does not show the operation sequence flowchart 1 when the camera body side fix combination unit 101 is interrupted by the duplex synchronization signal V1H. Micro Combi: 1. - In step S21, when the number v[1 interrupt occurs in the vertical synchronization I, the data controller 101 in step S22
A/' I) Signal level S1 from converter 102
In step S23, a predetermined reference level S2 is read in from the beginning, and in step S24, S, , =S, -
In step S2, the error S3 is obtained, and in step S25, I=
Find I+S, XK, C, and integral value, step 32
6, it passes through the microcontroller coater 103 on the lens side.
; The start code is sent out. In step S27, the above-mentioned integral value ■ is sent out, and the process ends in step 528.

In the lens side microcomputer 103, step 2
At step 9, upon receiving the communication start code mentioned above, a communication interrupt is generated! 1-C, in step 530, the integral value I is received, and the process ends in step S31.

FIG. 7 shows a sequence flowchart of the aperture drive operation of the lens-side mark color computer 103. That is, it starts in step S32, and in step S33, the aperture position P, which is the output of the A/D converter 106 mentioned above, is read, and in step S34, the position error EP is converted to EP2p, -.
i and 1 are determined, and in step S35, i1 equipment error EP
If EP≧0 (Y), the output type JIE V is set to V-Vo EPxK2 in step 36.

However, vo is the electric power L1-1 for the loss due to the friction of the aperture.
K2 is a constant determined by the operating constant of the diaphragm. If EP<O (N), the output voltage V is set to v, =Vo-Epxx, in step S37.

(Further other embodiments) In the embodiment shown in FIG. 1, the memory 2 of the lens unit 10 is
However, a circuit element such as a memory control circuit or a microcomputer is provided in the lens unit 10 to read out the data stored in the memory 22 and send it to the camera body 30 side, so that a command from within the camera body 30 is read out. depending on,
The required data may be sent to the camera body.

In addition, in transmitting the signal for aperture control from the camera body 30 side to the lens unit 10 side, in the embodiment of FIG. 1, the gain and time constant are adjusted, but other control values, such as error detection Gain, phase shift characteristics, delay time, maximum control width,
One or more of the dead zone widths may be adjusted.

Instead of aperture control or the method illustrated in FIG. 1, partial photometry or peak detection may be used. 7. The data to be stored in the memory 22 includes a code for identifying the aperture control method and the absolute (/l or relative (/I-3t) of the control constant of the aperture control loop, < is both "(4v, Alternatively, a plurality of control constants may be stored.

In other embodiments shown in FIG. 4, the diaphragm is driven by a pulse motor, and the diaphragm is driven by a pulse motor. An integrated value of drive pulses may also be used. Furthermore, the A/D converter 102 may A/D convert the captured image as it is, or may A/D convert the value obtained by smoothing, integrating, sample-holding, or detecting a peak. In addition, we have explained the operation of the camera body microcomputer 101 and the lens side microcomputer 103 using the flowcharts in Figures 5 to 7. Of course, it is also possible to perform 11 processes on one side of the flowchart on the other side (effects). Since the aperture characteristics of each interchangeable lens are known and the aperture control of the interchangeable lens can be changed according to the aperture characteristics, it is possible to use interchangeable lenses 10 with various characteristics for one camera body 30, and quickly can be exchanged for.

Furthermore, since the aperture 14 is controlled in such a way that the aperture angle is determined according to a human input signal to the lens-side microcomputer 103, the camera body 30 side does not read the output of the encoder 105 of the lens aperture 14. However, the 11 angle of aperture of the diaphragm 14 can be known from the current data sent to the lens.
It is possible to create a table/J in F (electronic view finder), etc.

Furthermore, when performing aperture control using f-movement, it is possible to send a value corresponding to the voltage generated by a variable resistor or the like to the lens-side microcomputer 103. In addition, as described above, the camera side microcomputer 101
The output value of the aperture 14 is equivalent to 1 angle, so the aperture 1
It is also possible to vary the control characteristics of 4 to 1/4 depending on the angle. Furthermore, since the coefficients for controlling the diaphragm 14 are set by software, there is no deviation in the adjustment values of the time constant, gain, etc. due to the impedance of the switch circuit, and precise control can be performed.

〔Effect of the invention〕

As explained in I-1 below, according to the present invention, in an interchangeable lens camera, the aperture characteristics of each interchangeable lens can be known on the camera body side, and the aperture control of the interchangeable lens can be changed according to the stiffness. Because of this structure, interchangeable lenses with various characteristics can be easily used with one camera body, and manual adjustment is not required each time they are replaced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the configuration of an embodiment of the present invention, FIG. 2 is an operation sequence flowchart of the microcomputer shown in FIG. 1, and FIG. 3 is a diagram showing the amplifier and variable time constant of FIG. FIG. 4 is a block diagram of the configuration of the circuit portion, FIG. 4 is a block diagram of the configuration of another embodiment of the present invention, and FIGS. An example of a sequence flow chart is shown. 10...Lens section 14...Aperture 20...Aperture drive mechanism 22...Memory 30...Camera body 36...・Image sensor

Claims (2)

[Claims] (1) An interchangeable lens camera device, which has a memory for storing identification data for identifying aperture characteristics within the lens, and adjusts aperture control characteristics within the camera body based on the identification data. A camera device and an interchangeable lens characterized in that they are configured as follows. 2. The camera device and interchangeable lens according to claim 1, further comprising memory means for storing identification data of the aperture characteristic and/or control data corresponding to the aperture characteristic.