JPH0470634A - Information processor for interchangeable lens - Google Patents

Abstract

PURPOSE:To perform normal photometry or autofocusing photographing even in the case of performing swing photographing such as tilt and shift, etc.,by providing a means for correcting a diaphragm effective value or an exposure correction value in accordance with a tilt amount and a shift amount in a lens. CONSTITUTION:This device is provided with means 5-7 for detecting a tilt angle, the shift amount and a rotational amount, a fixing and storing circuit 12 in which exposure correction information or the diaphragm effective value which is changed according to the photometry distribution characteristic of the photometry systems 21-25 of a camera is fixed and stored at respective addresses, and address specification circuit 31 which specifies the address of the information in the circuit 12 by the means 5-7, and an output means 12 for outputting the information stored at the address in the circuit 12 which is specified by the circuit 31 to a camera main body. Therefore, in the case of performing the tilt or the shift, etc., the exposure is corrected in accordance with the amount of the tilt o the shift. Thus, the normal photometry or the autofocusing photographing is performed even in the case of performing the swing photographing E such as the tilt or the shift.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information processing device for an interchangeable lens provided with correction information for photometry errors in tilted photography.

[Prior Art] As a method for determining the exposure amount of a photograph, it is already known that photometry is performed based on light passing through a photographic lens, which is called TTL.

The photometry method will be explained with reference to FIG.

FIG. 7 is a diagram showing a typical example of how to install a photometric sensor for measuring subject brightness in a TTL exposure amount determining device currently used in single-lens reflex cameras, where G1 is a photographing lens, 21. 22 is a mirror, 23 is a focusing screen, 24 is a pentaprism, 25 is an eyepiece, 29, 30, 40 is a photometric sensor, 41 is a condenser lens, and 42 is a half mirror.

[Problem B to be solved by the invention] However, with the above-mentioned conventional technology, when a lens for tilting or shifting photography, which will be described later, is attached, the light from the photographing lens G1 does not reach the photometric element correctly. Therefore, there was a problem in that a photometry error occurred.

The above-mentioned tilt is a method of tilting the optical axis of the photographic lens, and is a photographic technique that makes it possible to tilt the focusable subject surface, which is usually parallel to the film plane.The above-mentioned shift is a method of tilting the optical axis of the photographing lens. This is a photographic technique that moves the optical axis of the camera in parallel, making it possible to correct perspective.

Here, the reason why the photometry error occurs will be explained.

First, in order to guide light to the photometric sensor 30 shown in FIG.
The center part of the mirror 21 is a half mirror or the like, and in order to guide light to the photometric sensor 40, the center part of the condenser lens 41 is a half mirror 42 cut diagonally.
It has become. - In order to reduce the amount of light, a method of installing the photometric sensor 29 at the rear upper part of the pentaprism 24 is simple and is often used.

However, the farther the photometric sensor (photometering element) is placed from the focal plane, the more likely photometry errors will occur, and in the example shown in FIG.
This corresponds to the case where 9 is installed.

Figure 8 shows the photometry sensor 29 from the photographing lens G1 in Figure 7.
This is a linear expansion of the route leading to . FIG. 9 shows the light amount distribution of the focusing screen 23, where the horizontal axis represents the relative light amount and the vertical axis X represents the tilt angle from the optical axis.

The light intensity distribution of the focusing screen 23 is designed so that the center part transmits more light in order to make the finder view brighter. The amount of light shown at A in the figure is incident. Therefore, the exposure calculation is corrected in accordance with this amount of light, and the final amount of exposure is determined.

However, when the photographic lens G1 is tilted upward by an angle θ1, the optical axes of the photographic lens G1 and the photometric sensor 29 are almost aligned in a straight line, and the maximum amount of light B in FIG. 9 is incident.

On the other hand, when the optical axis is tilted downward by an angle θ, the deviation between the optical axis of the photographing lens G1 and the optical axis of the photometry sensor 29 becomes 2θ1,
Only the amount of light C in FIG. 9 will be incident. In other words, if the optical axis is tilted upward by an angle θ1, more light will enter the photometric sensor 29, so it will be judged as bright, and if the optical axis is tilted downward by an angle θ, the photometric sensor 29 will be underexposed. Since the amount of incident light decreases, it is judged as dark, resulting in overexposure.

The above are the problems when shooting with a tilted optical axis.
It is clear that similar problems occur when performing shift photography in which the optical axis is shifted.

The present invention attempts to solve the above problems. That is, an object of the present invention is to provide information processing for an interchangeable lens that allows normal photometry or AF photography even when tilting or shifting photography is performed.

[Means for Solving the Problems] In order to achieve the above object, an information processing device for an interchangeable lens of the present invention provides a camera system in which various unique information of an interchangeable lens is electrically transmitted from the interchangeable lens to a camera body. , a means for detecting the amount of parallel movement of the optical axes of at least some of the lenses of the photographic lens; a means for detecting the direction of parallel movement of the optical axes of at least some of the lenses of the photographic lens; and a means for detecting the direction of inclination of at least a part of the lenses of the photographic lens, and the detecting means and the camera a fixed memory circuit that fixedly stores exposure compensation information or an effective aperture value that changes depending on the photometric distribution characteristics of the photometric system at each address; an addressing circuit that specifies an address of the information in the fixed memory circuit by the detection means; and output means for outputting the information stored at the address of the fixed storage circuit designated by the address designation circuit to the camera body.

[Function] According to the present invention, when tilting, shifting, etc. are performed, there is a means for correcting the exposure amount according to the amount, so even when shooting with tilting, shifting, etc., normal metering or You will be able to perform AE photography.

[Embodiment] FIG. 1 shows a first embodiment of the present invention, and is a configuration diagram of a camera system.

In Fig. 1, 1 is a lens barrel, 2 is a tilt mechanism,
3 is a shift mechanism, 4 is a rotation mechanism, 5 is a tilt angle detection encoder, 6 is a shift amount detection encoder, 7 is a rotation amount detection encoder, 8 is an aperture, 9 is an aperture drive motor, 10
1 is a pinion gear, 11 is an aperture control circuit, and 12 is a lens-side microcomputer. 21.22 is a mirror,
The central portion of the mirror 21 is a half mirror to transmit light to the mirror 22 side.

23 is a focusing screen, 24 is a pentaprism, 25 is an eyepiece, 26 is a shutter unit, 2
7 is a shutter control circuit, 28 is a film, 29.30
31 is a camera-side microcomputer, and 32 is a film sensitivity input circuit. Film sensitivity is determined by the DX coat printed on the outer periphery of the cartridge or by manual selection.

33 is a power supply battery, 34 is a metering start switch, 35 is a release switch, 36 is a shooting mode selection switch, 37 is an aperture or shutter speed up switch, 3
8 is a down switch, and 39 is a switch for selecting a photometric element.

The switches 34 and 35 are such that the switch 34 is turned on during the first stroke of the shutter button, and the switch 35 is turned on during the second stroke of the shutter button. Each time the switch 36 is turned on, the photographing mode is changed, and the photographing modes include a shutter priority mode, an aperture priority mode, and the like. The switches 37 and 38 are switches for selecting a shutter or an aperture.

The switch 39 switches to average photometry when the photometric sensor 29 is selected, and spot photometry when the photometric sensor 30 is selected.

Next, the terminals of the lens-side microcomputer 12 will be explained.

GK is a clock input terminal that synchronizes communication between the camera and lens, 00 is a data output terminal that sends data from the lens to the camera, Di is a data input terminal that inputs lens commands or input from the camera, and Ti is the tilt angle. St is an input terminal of the detection encoder 5, St is an input terminal of the shift amount detection encoder 6, Ri is an input terminal of the rotation amount detection encoder 7, and VDD is a power input terminal.

Furthermore, the terminals of the camera-side microcomputer 31 will be explained.

As mentioned above, GK is a clock output terminal for synchronizing communication between the camera and lens, Lln is an input terminal for lens-side data, and Lout is a data output terminal for outputting commands or data from the camera to the lens.

Note that Sl, Sl, MODE, IIP, and DN have been explained for each switch, so their explanation will be omitted.

5-MoDE is ON (Lo) for average photometry, OFF (
OPEN) to perform spot metering.
Select 9.30. Also, Sl, Sl, MODE, L
The IP, DN, and S/MODE terminals are power input terminals V inside the camera-side microcomputer 31. It is pulled up to 0 with a resistor.

Figure 2 shows the R inside the lens-side microcomputer 12.
This is a diagram showing the address arrangement of the information stored in the OM, that is, the effective aperture value. In the diagram, the rotation amount detection encoder 7, the tilt angle detection encoder 5, and the shift amount detection encoder 6 each have 3 bits. shows,
Allocated from the top of the address.

In FIG. 1, when the shutter button (not shown) of the camera is pressed, the photometry start switch 34 is turned on and photometry starts.

The operation of the camera-side microcomputer 31 will be explained below using the flowchart shown in FIG.

Step #1: Input film sensitivity BV from the film sensitivity input circuit.

Step #2: Depending on the state of the photometry mode selection switch 39, if it is Lo, the process branches to step #3, and if it is Hl, the process branches to step #5.

Step #3: Photometric sensor (photometric element) for average photometry
29, the subject brightness BV at the time of average photometry is calculated.

Step #4: Serial output terminal to lens side microcomputer 12. Outputs a command to transmit the effective aperture value AV during average photometry from ut.

Step #5 Obtain the subject brightness BV0 during spot photometry from the photometry sensor (photometering element) 30 for spot photometry.

Step #6z Serial output terminal to lens side micro combinator 12. Outputs a command to transmit the effective aperture value AV during spot photometry from ut.

Step #7: Manually calculate the effective aperture value AVE from the serial input Lln of the lens.

Step #8: If the AE mode is in AV priority mode, step #9 is followed by TV (if it is the first mode, step #
It branches to 11.

Step #9: Switch 37 if in AV priority mode.
Input the AV value set in step 38.

Step #10: BVo, SV, AVE,
Shutter speed TV is calculated from AV using a known method.

Step $11: If it is TV priority mode, manually set the TV value set with switches 37 and 38.

Step #12: BVo, SV, A'/l
, calculate the aperture value AV from the TV using a known method.

Step #13: If the second stroke of the shutter button (not shown) is pressed, the switch 35 is turned OFF.
N, go to step #14. If the switch 35 is not pushed in, the switch 35 is OFF, so go back to step #1 and repeat the photometry calculation.

Step #14: Serial output terminal to camera side microcomputer 31. An aperture drive command is sent from the ut to the lens, and the aperture value is narrowed down to the calculated or set aperture value.

Step #15: A shutter oven signal is output to the shutter control circuit 27, the shutter is opened, and a shutter close signal is output after the calculated or set shutter time has elapsed, the shutter is closed and the exposure operation is ended.

Step #16: Similar to step #14, connect the terminal. A command to open the aperture is sent from the UT, the aperture is opened, and a series of exposure operations is completed.

Next, AV! The operation of the lens-side macroscopic computer 12 when receiving a transmission command will be explained with reference to FIG.

In the following description, the tilt angle detection encoder 5, shift amount detection encoder 6, and rotation amount detection encoder 7 are all 3 bits.

By inputting the step non-208 rotation amount detection encoder 7 and shifting 6 bits to the left, bit8.7.6
indicates the rotation amount pressure encoder.

Step 21: The tilt angle detection encoder (tilt amount detection encoder) 5 is manually shifted by 3 bits to the left, so that bit 5.4°3 indicates the tilt amount detection encoder.

Step 22: Manually operate shift amount pressure encoder 6.

Step 23: The rotation amount shifted by 6 bits to the left, the tilt amount shifted by 3 bits to the left, and the data for the left 9 bits of the address shown in Figure 2 are assembled by taking the logical sum of the shift amounts. .

Step @ 24: AV! If the sending command is a command to send the effective aperture value during average photometry, step #25
If the command is to send an effective aperture value during spot photometry, the process branches to step #26.

Step #25: If it is the effective aperture value during average metering, set the MSB (most significant address) to 0.
A 10-bit address for specifying the effective aperture value during average photometry shown in FIG. 2 is completed.

Step 26: If it is the effective aperture value during spot photometry, by setting the MSB to 1, a 10-bit address for specifying the effective aperture value during spot photometry is similarly completed.

Step #27: Based on the address created up to Step #26, the RO in the lens side microcomputer 12 is
Read the effective aperture value data stored in M.

Step 28: Data on the effective aperture value is serially transmitted to the camera side through the terminal DO, and the process ends.

In the first embodiment described above, by tilting, shifting, etc.
Although we have shown a method for correctly performing photometry calculations by correcting the effective aperture value, which indicates the actual brightness of the lens, in the second example below, we will use exposure compensation information without correcting the effective aperture value. We will explain how to perform exposure compensation.

Also in the second embodiment of the present invention, the circuit configuration is the same as that in FIG. 1, so the circuit etc. will be explained with reference to FIG. 1.

FIG. 5 is a diagram showing the address arrangement of information stored in the ROM inside the lens-side microcomputer 12, that is, exposure compensation information, in the second embodiment of the present invention. The encoder 5, shift amount detection encoder 6, and rotation amount detection encoder 7 each have 3 bits, which are allocated from the upper address.

When the first stroke of the shutter button of the camera (not shown) is pressed, the photometry start switch 34 shown in FIG. 1 is turned ON and photometry starts.

The operation of the camera-side microcomputer 31 will be explained below using the flowchart shown in FIG.

Step #31: Manually input film sensitivity Sv from the film sensitivity input circuit.

Step #32: Depending on the state of the photometry mode selection switch 39, if it is Lo, the process branches to step #33, and if it is Hl, the process branches to step #35.

Step #33: Obtain the subject brightness BV during average photometry from the photometry sensor (photometering element) 29 for average photometry.

Step #34: Serial output terminal to lens side microcomputer 12. A command to transmit the exposure correction value EVc during average metering is output from ut.

Step #35 Obtain the subject brightness BV0 during spot photometry from the photometry sensor (photometering element) 30 for spot photometry.

Step #36: Lens side microphone □ Locomviator 12
Serial output terminal to. Outputs a command to transmit the exposure correction value Eve during spot metering from ut.

Step #37: Serial input terminal Lln from lens
The exposure compensation value EVc is manually set from .

Step $38: Terminal. Outputs a command to send the open aperture value ^v0 from ut.

Step #39: Manually input the Av0 from the terminal Lln.

Step #40: If the AE mode is the AV priority mode, the process branches to step #41, and if the TV priority mode, the process branches to step #43.

Step #41: ^ Switch 37 if V priority mode
．． Input the AV value set in step 38.

Step $42: Calculate shutter speed TV from BVo, SV, AV, and EVe using a known method.

Step #43: Switch 37 if TV priority mode
．． Input the TV value set in step 38.

Step $44: BV,, SV, AV,, TV,
Aperture value AV is calculated from EVc using a known method.

Step #45: If the second stroke of the shutter button (not shown) is pressed, the switch 35 is turned OFF.
N, go to step #46. If the switch 35 is not pushed in, the switch 35 is OFF, so go back to step #31.
Repeat photometry calculation.

Step #46: Serial output terminal of camera side microcomputer 31. An aperture drive command is sent from the ut to the lens, and the aperture value is narrowed down to the calculated or set aperture value.

Step #47: Outputs the shutter oven signal to the shutter control circuit 27, opens the shutter, and after the calculated or set shutter time elapses, outputs the shutter close signal, closes the shutter, and ends the exposure operation. do.

Step #48 2 Similar to step #46, connect the terminal Lout.
sends an aperture open command from the camera, opens the aperture, and completes a series of exposure operations.

Note that the operation of reading the exposure correction value from the rotation amount, shift amount, and tilt amount is the same as that shown in FIG. 4, so a description thereof will be omitted.

[Effects of the Invention] As explained above, according to the present invention, since the lens has means for correcting the effective aperture value or the exposure compensation value according to the amount of tilt and shift, Even a special lens for tilting photography has the effect of allowing normal photometry or AF photography.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of a camera system implementing the first embodiment of the present invention, and FIG. 2 is an explanatory diagram of the address arrangement of the ROM in which the effective aperture value obtained by the apparatus of FIG. 1 is stored. , Figure 3 is an explanatory flowchart showing the program built in the camera side microcomputer in Figure 1, and Figure 4 is a flowchart showing the program built in the lens side microcomputer in Figure 1. Explanatory diagram! FIG. 5 is an explanatory diagram of the address arrangement of the ROM in which exposure compensation values are stored in the second embodiment of the present invention, and FIG. 6 is an explanatory diagram showing the program built in the camera-side microcomputer in the form of a flowchart. FIG. 7 is an explanatory diagram of a photometric system of a conventional camera, FIG. 8 is a developed diagram of the photometric optical system, and FIG. 9 is an explanatory diagram of scattering characteristics during focusing. ]... Lens barrel 2... Tilt mechanism 3.
...Shift mechanism 4...Rotation mechanism 5...Tilt angle detection encoder 6...Shift amount detection encoder 7...Rotation amount detection pressure encoder 8...Aperture 11...Aperture control circuit 1
2... Lens side microcomputer 21.22...
・Mirror 23... Focusing screen 24... Pentaprism 25... Eyepiece 26
...Shutter unit 27...Shutter control circuit 28...Film 29.30...Photometering sensor 31...Camera side microcomputer 32...Film sensitivity input circuit 34-39...Switch and others 4 name chart chart chart chart chart

Claims (1)

[Claims] 1. A camera system in which various unique information of an interchangeable lens is electrically transmitted from the interchangeable lens to the camera body,
means for detecting the amount of parallel movement of the optical axes of at least some of the lenses of the photographic lens; means for detecting the direction of parallel movement of the optical axes of at least some of the lenses of the photographic lens; comprising at least one detection means, a means for detecting the amount of inclination of the optical axis of the lens, and a means for detecting the direction of inclination of at least a part of the lenses of the photographic lens, and a photometry system of the camera and the detection means; a fixed memory circuit that fixedly stores exposure correction information that changes depending on the photometric distribution characteristics of the fixed memory circuit at each address; an addressing circuit that uses the detection means to specify an address of the information in the fixed memory circuit; An information processing device for an interchangeable lens, comprising output means for outputting information stored at an address of the fixed storage circuit to a camera body. 2. A fixed memory circuit that fixedly stores exposure compensation information according to the camera's photometric sensitivity distribution and photometry method at each address;
2. The information processing device for an interchangeable lens according to claim 1, further comprising a designation information input means for designating the information from a camera, and an address designation circuit for designating an address of the information based on the designation information. 3. In a camera system in which various unique information of an interchangeable lens is electrically transmitted from the interchangeable lens to the camera body,
means for detecting the amount of parallel movement of the optical axes of at least some of the lenses of the photographic lens; means for detecting the direction of parallel movement of the optical axes of at least some of the lenses of the photographic lens; comprising at least one detection means, a means for detecting the amount of inclination of the optical axis of the lens, and a means for detecting the direction of inclination of at least a part of the lenses of the photographic lens, and a photometry system of the camera and the detection means; a fixed memory circuit that fixedly stores at each address an actual F-number that changes depending on the photometric distribution characteristics of the image; an addressing circuit that uses the detection means to specify an address of the information in the fixed memory circuit; An information processing device for an interchangeable lens, comprising: output means for outputting information stored at an address of the fixed storage circuit to a camera body. 4. A fixed memory circuit that fixedly stores the photometric sensitivity distribution of the camera and the actual F-number according to the photometric method at each address, and a specified information input means for specifying the information from the camera;
4. The interchangeable lens information processing device according to claim 3, further comprising an address designation circuit that designates an address of information based on the designation information.