JPH0389222A - Shift camera - Google Patents

Abstract

PURPOSE:To reduce the size of the camera by diverting an image deflection correcting mechanism which has a movable lens capable of moving at right angles to the optical axis of a photographic lens, and moving this movable lens and varying a visual field range. CONSTITUTION:When a switch SMD is turned on from an OFF state before a switch S1 is turned on, a mode other than a normal photographic mode is selected, and it is decided whether or not the selected mode is a shift mode with a switch SMS ON. When the mode is the shift mode, a microcomputer 3 calculates movement quantity data on a subject image on a film surface from a displacement signal inputted from a displacement signal generating means 11 and outputs the data to a movement quantity arithmetic circuit 4, which calculates the movement quantity of the movable lens 6. In the shift camera, the microcomputer 3 inputs displacement information detected through a displacement quantity detection sensor 1 and a displacement arithmetic circuit 2, calculates the displacement direction and displacement quantity from the direction of the subject of a camera main body, and outputs the result to the circuit 4, thereby calculating the movement quantity of the movable lens 6. The result is outputted to a driving circuit 7, which drives the lens 6 by a specific quantity in a specific direction to vary the visual field range.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shift camera that can freely change the screen configuration of a subject image projected onto a film surface.

[Conventional technology]

2. Description of the Related Art Conventionally, cameras have been proposed that can change the screen configuration of a subject image projected onto a film surface by changing the optical path of a photographic lens. For example, JP-A-63-197
Publication No. 926 discloses that a tilting mechanism capable of shifting and tilting is provided in the front part of the photographing lens, and the screen configuration of the photographing screen can be freely changed by operating the tilting mechanism to change the optical path of the photographing lens. An optical device capable of this is shown.

[Problem to be solved by the invention]

By the way, the conventional optical device described above requires a dedicated lens and a 1blJ III vR position to obtain the tilt effect, and there is a problem that the configuration of the photographic lens becomes complicated.

The present invention has been made in view of the above problems, and is a shift system that can freely change the screen configuration with a simple configuration by utilizing an image stabilization mechanism for correcting image blur caused by hand shake or camera shake. The purpose is to provide cameras.

[Means for Solving the Problems] In order to solve the above problems, the shift camera according to claim 1 has a movable lens that is movable in a direction perpendicular to the optical axis of a photographic lens, and a shift camera that can move images due to camera shake or camera shake. A detection means for detecting the amount of shake, and at least driving the movable lens based on the amount of image shake detected by the detection means during exposure to film to cancel image shake caused by hand shake and take a picture without image shake. A selection means for selecting a shift mode in a camera that enables
When the shift mode is selected by the selection means, a calculation means for calculating the moving direction and amount of movement of the movable lens in order to obtain a desired shift effect using the detection result of the detection means, and based on the calculation result. and a driving means for controlling the movement of the movable lens.

The shift camera according to claim 2 further includes a movable lens movable in a direction perpendicular to the optical axis of the photographic lens, a detection means for detecting an amount of image blur due to hand shake or camera shake, and a shift camera that detects an amount of image blur due to hand shake or camera shake, and at least a movable lens movable in a direction perpendicular to the optical axis of the photographing lens. In a camera that cancels image blur caused by camera shake by driving the movable lens based on the amount of image blur detected by the detection means, and enables photographing without image blur, a displacement signal is sent to change the field of view. a displacement signal generating means for outputting a displacement signal, a calculating means for calculating a moving direction and a moving amount of the movable lens based on the displacement signal, and a driving means for controlling the movement of the movable lens based on the calculation results. It is something that

(Function) In the shift camera according to claim 1 configured as described above, when the shift mode is selected, the image blur detection means detects information such as the direction and amount of displacement of the subject image on the film surface. is detected, and the direction and amount of movement of the movable lens are calculated from the detection results. Then, based on the calculation result, the movable lens is moved by a predetermined amount in a predetermined direction, and the optical axis of the photographing lens changes, thereby changing the viewing range.

Further, in the shift camera according to claim 2, the direction and amount of movement of the movable lens are calculated from the displacement signal for changing the visual field instructed by the operator using the displacement signal generating means, and the movement direction and amount of the movable lens are Based on this, the movable lens is moved by a predetermined amount in a predetermined direction. As a result, the optical axis of the photographing lens changes, thereby changing the viewing range in the designated direction.

〔Example〕

FIG. 1 shows a system configuration diagram of a shift camera according to the present invention. In the figure, reference numeral 1 denotes a displacement detection sensor that detects displacement of the imaging position of a subject image on a film surface due to hand shake, camera shake, or the like. The displacement detection sensor 1 includes, for example, an angular velocity sensor that detects angular changes in the entire optical system, an acceleration sensor that detects relative acceleration between two different positions of the optical system, or a sensor that directly detects the displacement of a subject image. Ru. In addition to hand shake and camera shake, the displacement detection sensor 1 can also detect displacement of the imaging position of the subject image when the camera is actively moved when the shift mode described later is selected. be. 2 is a displacement calculation circuit that calculates the amount of displacement of the subject image on the film surface from the detection signal of the displacement detection sensor 1, and 3 is a microcomputer (3) that controls the operation of each actuator of the camera and controls the entire photographing operation. (hereinafter referred to as a microcomputer). In addition, in the image stabilization mode to be described later, when displacement data is input from the displacement calculation circuit 2, the microcomputer 3 determines whether or not image stabilization is possible, and when image stabilization is possible, the displacement data is output to a movement amount calculating circuit 4, which will be described later, to control the drive of a movable lens 6, which will be described later. In the shift mode, which will be described later, data on the amount of movement of the subject image on the film surface is calculated from the displacement signal for changing the visual field inputted from the displacement signal generating means 11, and outputted to the movement amount calculation circuit 4, and Controls the drive of 6. The movement amount calculation circuit 4 is a calculation circuit that calculates the actual movement amount of the movable lens 6 from the displacement amount data or movement amount data. Reference numeral 5 denotes a photographing lens consisting of a zoom lens group and a focus lens group, and the movable lens 6 is preferably disposed near the aperture position or behind it (on the camera body side), although it varies depending on the configuration of the photographic lens 5. As shown in Figs. 2 and 3, the 111We lens 5 can be moved in the vertical direction (vertical direction) (2) and in the horizontal direction (1) or in the θ direction (θ) tilted with respect to the optical axis. It is configured. Reference numeral 7 denotes a drive circuit for controlling the movement of the movable lens 6, which moves the movable lens 6 based on movement amount data inputted from the movement amount calculation circuit 4. Further, 8 is a lens data circuit in which various information regarding the photographic lens 5 is recorded, 9 is a photometry circuit for detecting subject brightness, and 10 is an exposure control circuit for controlling shutter speed and exposure 1.

Next, I will explain the switches. Sl is a photographing preparation switch that is turned on when the release button is pressed halfway. When the switch S1 is turned on, photometry and distance measurement (focus detection) for photographing are performed, and displacement amount data for camera shake correction, which will be described later, is calculated. Sl
is a release switch that turns on when the release button is pressed. When the switch S2 is turned on, photographing starts. S3 is a switch that detects the end of the exposure sequence, and switch S3 is turned on when exposure is completed and film winding is completed.
to is a mode changeover switch. In addition to the normal shooting mode, the shift camera of this embodiment has an image stabilization mode and a shift mode, which will be described later.
When D is off, the normal photographing mode is set, and when it is on, either the image stabilization mode or the shift mode can be selected. 5ras is a mode selection switch for the image stabilization mode or shift mode, and by pressing the switch SMS, the image stabilization mode and shift mode cyclically change, and either mode can be selected. Reference numeral 11 denotes a displacement signal generating means for the photographer to move the movable lens 6 to change the field of view when the shift mode is selected. The displacement signal generating means 11 may be disposed in the camera, such as a joystick or a ball used in a mouse, and may generate two-dimensional position data by rotating it, or may output a unit displacement value each time it is pressed. Switches for each of the x and y directions are used, and the view range can be changed in any direction.

Further, in the shift mode, the movement of the movable lens 6 described above can be automatically performed using information regarding the displacement detected from the displacement amount detection sensor 1 and the displacement calculation circuit 2. In this case, when the microcomputer 3 takes in the information regarding the displacement, it calculates the direction and amount of displacement of the camera body from the direction of the subject, and from the calculation results, moves the movable lens from the horizontal direction of shooting toward the subject. The direction and amount of movement for moving 6 are set and output to the movement amount calculation circuit 4. The movement amount calculation circuit 4 calculates the movement amount of the movable lens 6 from the movement direction and movement amount, and outputs the calculation result to the drive circuit 7 to move the movable lens 6 by a predetermined amount in a predetermined (subject) direction. In this way, if the camera body is tilted from the direction of the subject, the tilt is automatically determined, and the field of view is appropriately changed to cancel the tilt. To enable, for example, a subject located below the normal visual field to be included in the visual field while facing in the shadow direction (horizontal direction).

Next, the photographing modes of image stabilization mode and shift mode will be explained.

In the image stabilization mode, the movable lens 6 is moved to cancel out camera shake and camera shake that occur when taking pictures with high magnification or slow shutter speeds, and forms a still image on the film surface. This mode allows you to take photographs without displacement by exposing the lens to light. When the switch S1 is turned on, the amount of displacement of the subject image on the film surface is calculated by the displacement detection sensor 1 and the displacement calculation circuit 2 at the same time as photometry and distance measurement preparations are made. The microcomputer 3 takes in this displacement amount data, determines whether camera shake correction is possible from the displacement amount data and the photometry data, and
If it is determined that camera shake correction is possible, the displacement amount data is output to the movement amount calculation circuit 4 during film exposure or when only the switch S1 is on. Movement amount calculation circuit 4
calculates the moving direction and amount of movement of the movable lens 6 from the displacement amount data, and outputs the calculation results to the drive circuit 7. The drive circuit 7 moves the movable lens 6 based on the input movement direction and movement amount so as to offset the displacement amount of the subject image on the film surface without deteriorating the aberration performance of the dynamic lens 1.
move.

The shift mode is a mode in which the movable lens 6 is moved to change the optical path of the photographing lens 5, and the field of view is changed, thereby making it possible to freely configure the photographing screen.

FIG. 4 is a diagram showing how the field of view changes by moving the movable lens 6. In the same figure, visual field range D1
is the viewing range when the movable lens 6 is not moving (normal photographing mode), and the viewing range D2 is the viewing range when the movable lens 6 is moved upward in the Z direction.

As shown in the figure, for example, when the movable lens 6 is moved upward in two directions by operating the displacement signal generating means 11, the field of view moves downward, so that the attitude toward the camera body is maintained horizontally. This allows you to include subjects below the normal shooting range in the frame composition. This shift mode makes it easier to photograph subjects that are difficult to capture in a normal posture. Furthermore, when taking pictures with the camera body A fixed on a tripod, fine adjustments to the screen configuration set by -degrees can be easily made without resetting the position of the camera body A.

Next, the photographing operation of the shift camera according to the present invention will be explained using the flowchart shown in FIG.

First, when the main switch is turned on and the camera starts up, check the status of switch S1 and switch SMD (
#5. #10). When the switch $1 is turned on while the switch SMD is in the off state, it is the normal shooting mode, and normal shooting is performed according to the following flow. If the switch SMD changes from the off state to the on state before the switch S1 is turned on, a mode other than the normal shooting mode has been selected, so it is further determined whether the selected mode is the shift mode by operating the switch SMS. (#15). If it is not the shift mode, that is, if it is the image stabilization mode, the process returns to #5, and if it is the shift mode, the microcomputer 3 determines the amount of movement of the subject image on the film surface from the displacement signal input by the displacement signal generating means 11. The data is calculated and output to the movement amount calculation circuit 4, and the movement amount of the movable lens 6 is calculated by the movement amount calculation circuit 4 (#20). Note that if the shift camera is configured to automatically perform the shift mode, the microcomputer 3 takes in information regarding displacement detected from the displacement amount detection sensor 1 and the displacement calculation circuit 2, and uses the information to determine the position of the camera body. The direction and amount of displacement from the direction of the subject are calculated, and the calculation results are output to the shift calculation circuit 4, which calculates the amount of movement of the movable lens 6. This calculation result is output to the drive circuit 7, the movable lens 6 is moved by a predetermined distance in a predetermined direction, and the viewing range is changed (#25>.Subsequently, when the switch S1 is turned on, the photometry circuit 9 to meter the subject brightness (#30), and determine whether the @Akira mode is the image stabilization mode (#35>). If it is not the image stabilization mode, jump to #55 and check whether it is the image stabilization mode or not. For example, the displacement amount on the film surface is calculated from the displacement detection sensor 1 and the displacement calculation circuit 2, and the displacement amount data is input into the microcomputer 3 (#40 and #45).
Exposure calculation is performed from the photometric data, and exposure control values for aperture and shutter speed are calculated (#50).

Next, it is determined whether the switch S2 is in the on state, and if it is in the off state, the process returns to #5 and the above operation is repeated, and if it is in the on state, the selected mode is the image stabilization mode. Determine whether there is one again (
#55゜#60〉. If the flash mode is the image stabilization mode, the photometric data and displacement amount data are inputted from the microcomputer 3 to the movement amount calculation circuit 4, and the movement amount calculation circuit 4 selects a movable lens 6 capable of suitable image stabilization. The amount of movement is calculated (#65 to #75>. The calculation result is sent to the drive circuit 7.
The drive circuit 7 moves the movable lens 6 based on the input movement direction and movement amount so as to offset the displacement of the subject image on the film surface (#80). Movable lens 6
The movement of is continued by repeatedly executing steps #70 to #80 until completion of photographing is detected by switch $3. Then, a predetermined exposure is performed using the aperture value and shutter speed set above, and when the end of photography is detected, the photography sequence ends (#85.#10
5). If the shooting mode is not the image stabilization mode, that is, if it is the normal shooting mode or the shift mode, a normal shooting mode (OFF mode) signal or a shift mode signal is output to the movement amount calculation circuit 4 to change the movement of the movable lens 6. Prohibits movement and outputs the above photometric data (#90
．． #95). Then, a predetermined exposure is performed using the aperture value and shutter speed set above, and when the end of photography is detected by the switch S3, the enemy shadow sequence is ended (#100° #105).

〔Effect of the invention〕

As explained above, according to the present invention, an image stabilization mechanism having a movable lens movable in a direction perpendicular to the optical axis of a Yue-sho lens is used, and the field of view is changed by moving the movable lens. This simplifies the structure of the actuator for changing the field of view, making it possible to downsize the shift camera. In addition, the displacement of the subject image on the film surface is detected, the amount of displacement of the camera body from the direction of the subject is calculated, and the amount of displacement is corrected to automatically change the field of view, so the screen configuration can be adjusted. Even difficult subjects can be easily captured on the shooting screen without forcing the camera into an awkward position. In addition, a displacement signal generating means that can freely change the field of view is provided, and the movable lens is moved by inputting the amount of displacement using the displacement signal generating means.
The photographer can configure the screen as desired, and can easily and freely photograph subjects even in positions that are difficult to photograph.

[Brief explanation of drawings]

Fig. 1 is a system configuration diagram of a shift camera according to the present invention, Fig. 2 is a side view showing the moving direction of the movable lens, Fig. 3 is a front view showing the moving direction of the movable lens, and Fig. 4 is a system configuration diagram showing the moving direction of the movable lens. FIG. 5, which is a diagram showing changes in the field of view range, is a flowchart showing the photographing operation of the shift camera according to the present invention. 1...Displacement detection sensor, 2...Displacement calculation circuit, 3.
...Microcomputer, 4...Movement calculation circuit, 5...Photographing lens, 6...Movable lens, 7...Drive control circuit,
8... Lens data circuit, 9... Photometry circuit, 10.
...Exposure control circuit, 11...Displacement signal generation means, S+
, 82.838a, SMD, SMs...switch.

Claims (1)

[Scope of Claims] 1. A movable lens that is movable in a direction perpendicular to the optical axis of the photographic lens, a detection means for detecting the amount of image blur due to hand shake or camera shake, and at least the above detection means during exposure to film. In a camera that cancels image blur caused by hand shake by driving the movable lens based on the amount of image blur detected by the camera, and enables photographing without image blur, a selection means for selecting a shift mode; and a selection means for selecting a shift mode. when the shift mode is selected, a calculation means for calculating the moving direction and amount of movement of the movable lens to obtain a desired shift effect using the detection result of the detection means; A shift camera comprising a drive means for controlling movement of a movable lens. 2. A movable lens movable in a direction perpendicular to the optical axis of the photographic lens, a detection means for detecting the amount of image blur caused by hand shake or camera shake, and an amount of image blur detected by the detection means at least during exposure to film. Displacement signal generating means for outputting a displacement signal to change a viewing range in a camera that cancels image blur caused by hand shake by driving the movable lens based on the above, and enables photographing without image blur; A shift camera comprising: calculation means for calculating the moving direction and amount of movement of the movable lens based on the displacement signal; and driving means for controlling the movement of the movable lens based on the calculation results.