JPH06337457A - Optical instrument - Google Patents

Abstract

PURPOSE:To eliminate uneven illumination caused by an illuminating means to obtain an image illuminated uniformly by operating a vibration proofing function. CONSTITUTION:An illuminating angle control means 12 which compensates a setting value of an illuminating angle set by illuminating angle setting means 1-6 according to the output of a detecting means on the operation of a vibration proofing means is installed. An illuminating amount variable means 12 which varies an illuminating amount by an illuminating means according to the output of a compensating amount calculation means is installed. When bibration proofing control is operated, illuminating amount onto the wide angle side at the illuminating angle is varied or illuminating amount is varied according to the output of a detecting means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an irradiation for changing an irradiation angle of an image stabilizing unit for correcting an image blur (disturbance of a screen) due to a camera shake or an illuminating unit for illuminating an object according to a focal length of a lens. The present invention relates to improvement of an optical device such as a photographing device, which is provided with an angle setting means.

[0002]

2. Description of the Related Art Conventionally, an irradiation angle of a strobe device is changed (for example, by changing a relative position between a flash discharge tube and a reflecting shade) in response to a change in a focal length of a photographing lens, and a photographing range and an irradiation are irradiated. A single-lens reflex camera is known in which the ranges are always matched. Further, there is also known a video camcorder equipped with an image stabilizing function for performing image blur correction by driving a correction optical system according to the obtained amount of camera shake.

Therefore, it is possible to make the photographing apparatus easy to use by providing both of the above functions.

[0004]

However, in the case of such a configuration, by switching from the state in which the image stabilizing function is not activated to the state in which the image stabilizing function is activated, the photographing device 51 can move in the pitch direction as shown in FIG. 7, for example. When camera shake occurs in the (vertical direction), although the shooting range is the same due to the function of the image stabilization function, the flash irradiation range of the flash 52 changes to the position shown by the dotted line. Therefore, there is a problem in that the shooting range on the surface of the imaging target 53 and the stroboscopic irradiation range of the stroboscope 53 do not match, resulting in an image with uneven irradiation.

(Object of the Invention) It is an object of the present invention to provide an optical apparatus capable of eliminating an uneven illumination of an illuminating device by activating an anti-vibration function and always obtaining an image of uniform illumination.

[0006]

According to the present invention, there is provided an irradiation angle control means for correcting the irradiation angle setting by the irradiation angle setting means in accordance with the output of the detection means when the anti-vibration means operates. The irradiation amount varying means for changing the irradiation amount by the illumination means is provided according to the output of the correction amount calculating means, and during the image stabilization control, the amount of irradiation angle to the wide-angle side is changed according to the output of the detecting means at that time. The amount of irradiation is changed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.

FIG. 1 is a block diagram showing the configuration of the essential parts of an embodiment in which the present invention is applied to a single-lens reflex camera (strobe built-in type).

In FIG. 1, 1 is a strobe which is a light emitting body, 2 is an irradiation angle varying motor for moving the strobe 1 to a telephoto or a wide angle, and 3 is an irradiation angle varying motor 2
A driver circuit for driving the strobe 2, an encoder for detecting the movement amount of the strobe 2, a light emitting circuit 5 for causing the strobe 2 to emit light, and a control 6 for controlling the light emission amount and dimming of the strobe 2. Reference numeral 7 is a circuit, 7 is a dimming unit for detecting reflected light from an object to be imaged, 8 is an AF unit for detecting focusing of a lens, 9 is a photometric unit for detecting external light brightness, and 10 is a camera. A display unit for displaying various states, 11 is a feeding unit for winding and rewinding the film, 12 is a camera microcomputer for controlling various controls of the camera, and 13 is an interchangeable lens.

FIG. 2 is a block diagram showing the configuration of the main parts arranged in the interchangeable lens 13.

In FIG. 2, reference numeral 21 is a lens unit for focusing, and 22 is a correction optical system whose main purpose is always to keep the photographing optical axis constant in order to suppress image blur caused by camera shake. Reference numeral 23 is an angular velocity sensor for detecting a vibration (for example, camera shake) applied to the camera, and 24
Is a filter for removing noise from the angular velocity sensor 23, 25 is an integrator for amplifying the output of the angular velocity sensor 23, 26 is a position sensor for detecting the position of the correction optical system 22, and 27 is the lens unit 21. Focal length encoder for detecting the focal length of the zoom lens, 28
Is a driver circuit for driving the optical correction system 22, 2
9 is a vibration control microcomputer that controls various controls related to vibration control, 30
Is an anti-vibration switch for setting whether to activate the anti-vibration function, 31 is a focus unit for controlling the focus of the focus lens in the lens unit 21, and 32 is for controlling the diaphragm in the lens unit 21. Aperture unit,
Reference numeral 33 is a lens microcomputer that controls various controls in the lens 13,
Reference numeral 34 denotes the camera (main body) shown in FIG.

Next, an outline of the camera system having the above configuration will be described. The detailed description of the camera 34 side and the lens 13 side will be described later.

The lens microcomputer 33 constantly monitors the image stabilization switch 30 and the focal length encoder 27, exchanges and stores the state of the lens 13 as information, and sends it to the camera 34. The camera microcomputer 12 always receives the information of the lens 13, converts it into camera information, and transmits it to various units. Further, the camera microcomputer 12 calculates the moving position of the strobe 1 based on the focal length information from the lens 13,
While monitoring the encoder 4, the irradiation angle changing motor 2 is driven via the driver circuit 3 to complete the movement of the strobe 1. This operation is performed every time the information from the focal length encoder 27 changes.

Next, the case where the anti-vibration switch 30 is turned on to activate the anti-vibration function will be described below.

The lens microcomputer 33 immediately transmits to the image stabilization microcomputer 29 that the image stabilization switch 30 has been turned on, and the image stabilization microcomputer 29 detects the output of the angular velocity sensor 23 via the filter 24 and the integrator 25. A inside the microcomputer
The correction direction and the correction amount are determined by calculation via the / D converter. Next, the image stabilization microcomputer 29 drives the correction optical system 22 via the driver circuit 28 based on the calculation result, and performs appropriate image stabilization (image shake correction) control while detecting the position sensor 26. Further, the lens microcomputer 33 transmits to the camera 34 that the image stabilization switch 30 has been turned on.

The camera microcomputer 12 receives the transmission from the lens 13, detects that the image stabilization control is being performed, and secures a uniform irradiation amount based on the output of the focal length encoder 27 in the lens 13. Then, the driving amount of the strobe 1 (for changing the irradiation angle) is calculated. Then, at the same time as the calculation is completed, the irradiation angle varying motor 2 is driven via the driver circuit 3,
The strobe 1 is controlled to a desired strobe irradiation angle while detecting the output of the encoder 4.

Further, the camera microcomputer 12 receives the change state via the lens microcomputer 33 in order to constantly monitor the state of the angular velocity sensor 23, and always controls the strobe 1 to an optimum state.

When the release is confirmed, the camera microcomputer 12 calculates the irradiation amount based on the output of the light control unit 7 and the output of the encoder 4. To a value that increases the irradiation amount (so that the same irradiation amount can be obtained even if the irradiation angle is widened according to the shooting angle of view)], the strobe 1 via the control circuit 6 and the light emitting circuit 5.
To fire and shoot.

Here, FIG. 3A shows an output waveform of the image stabilization switch 30, and FIG. 3B shows a current waveform when the irradiation angle varying motor 2 is energized.

The image stabilization switch 30 is switched from OFF to ON, and a signal to start image stabilization is output to the lens microcomputer 33. The lens microcomputer 33 communicates the image stabilization start to the image stabilization microcomputer 29 and the camera microcomputer 12, and the image stabilization microcomputer 29 starts the correction. The camera microcomputer 12 calculates the proper position of the strobe 1 based on the correction amount sent from the lens microcomputer 33, and drives the irradiation angle varying motor 2 to the wide angle side (reversal direction) via the driver circuit 3. And
While detecting the output of the encoder 4, it is confirmed that the strobe 1 has been driven to the proper position, and the driving of the irradiation angle varying motor 2 is stopped.

Further, the anti-vibration switch 30 is turned from ON to OFF.
When the mode is switched to, the lens microcomputer 33 communicates to the image stabilization microcomputer 29 and the camera microcomputer 12 that the image stabilization operation (shake correction) is prohibited, and in response to this, the image stabilization microcomputer 29
Ends the image stabilization operation. Also, the camera microcomputer 12
The proper position of the strobe 1 is calculated based on the focal length information transmitted from the lens microcomputer 33, and the irradiation angle changing motor 2
To the telephoto side (forward rotation direction). Then, while detecting the output of the encoder 4, it is confirmed that the strobe 1 has been driven to the proper position, and the driving of the irradiation angle varying motor 2 is stopped.

Next, the integrator 2 of the angular velocity sensor 23 is shown in FIG.
The output waveform after passing through 5 is shown.

When the camera microcomputer 12 receives an output as shown in FIG. 4 from the lens microcomputer 33, the camera microcomputer 12 controls the driving of the strobe 1 (for example, a reflection shade) according to the magnitude of the output (camera shake amount) obtained. Therefore, point B rather than point A
In this case, the driving amount of the strobe 1 is larger, that is, the strobe 1 is driven toward the wider angle side.

D represents a region where the strobe 1 can be stably driven, and C represents a period outside the D region.

When the output of the angular velocity sensor 23 is outside the area D like C, the camera microcomputer 12 drives and controls the strobe 1 to the maximum wide angle position.

Next, the operation of the camera microcomputer 12 of FIG. 1 will be described with reference to the flowchart of FIG. The operation here is step 1 through step 101.
It starts from 02.

First, the camera microcomputer 12 receives the current focal length information (F) from the lens 13 (step 10).
2) Then, the state in which the image stabilization switch 30 is ON or OFF is received (step 102). As a result, when the image stabilization switch 30 is OFF, the focal length information is calculated with a certain function value f '(F) as in the conventional case, and the drive amount (G) of the strobe 1 is calculated (step 111). On the other hand, when the image stabilization switch 30 is ON, the current camera shake amount (X, Y) in the two-dimensional direction is received from the lens 13 (step 10).
4) Then, "function f (X, Y) + function f '(F)" is calculated to calculate the strobe drive amount (G) (step 1).
05).

Next, it is judged whether or not the strobe driving amount (G) obtained in step 111 or 105 is larger than "0" (step 106), and if it is larger, that is, strobe 1 needs to be driven. If so, the irradiation angle varying motor 2 is driven through the driver circuit 3 to start driving the strobe 1 (step 107). And
While detecting the output of the encoder 4, it is judged whether or not a predetermined drive amount [the above strobe drive amount (G)] has been reached (step 108).
Is stopped (step 109) and the process returns to the main routine (step 110).

If the strobe driving amount (G) is "0", the process directly returns to the main routine (step 106).
→ 110).

Next, the operations of the lens microcomputer 33 and the image stabilization microcomputer 29 of FIG. 2 are set according to the flowchart of FIG. The operation here is started from step 202 via step 201.

First, the lens microcomputer 33 stores the current focal length of the lens from the output of the focal length encoder 27 (step 202) and sends it to the camera 34 as focal length information (step 203). Next, anti-vibration switch 3
The state of 0 is determined, and if the state is OFF, the process returns to the main routine (step 204 → 209).

On the other hand, when the anti-vibration switch 30 is ON,
A command for starting image stabilization (image stabilization) is sent to the image stabilization microcomputer 29. As a result, the image stabilization microcomputer 29 starts camera shake correction while monitoring the output of the angular velocity sensor 23 (step 205). Further, the lens microcomputer 33 transmits the fact that the image stabilization switch 30 is turned on to the camera 34 (step 206), and receives the output of the angular velocity sensor 23 amplified by the integrator 25 from the image stabilization microcomputer 29 (step 206). 207), arithmetic processing is performed, and the amount of camera shake is transmitted to the camera 34 (step 208). When all the processing is completed, the process returns to the main routine (step 20).
9).

According to the present embodiment, since the strobe 1 (strobe irradiation angle) is widened to the wide-angle side according to the amount of camera shake at the time when the image stabilization operation is performed, the camera shake is large. However, even if the correction optical system 22 is largely driven, that is, even if the orientation of the camera is greatly changed, it is possible to always perform the stroboscopic irradiation that covers the shooting range, and there is no uneven irradiation. , You can get beautiful images.

Further, since the strobe irradiation amount is changed according to the amount of strobe 1 widened to the wide-angle side,
It is possible to always obtain an image with constant brightness.

(Modification) In this embodiment, a single-lens reflex camera having a built-in strobe is taken as an example, but the same control may be performed by a combination of an external strobe and the camera body.

Although the present invention is applied to a single-lens reflex camera, the present invention is not limited to a photographing device such as a video camera or a still camera, and is not limited to a photographing device, and may be applied to binoculars or the like.

[0037]

As described above, according to the present invention,
At the time of actuation of the image stabilization means, an irradiation angle control means for correcting the setting of the irradiation angle by the irradiation angle setting means according to the output of the detection means is provided, and according to the output of the correction amount calculation means,
The irradiation amount varying means for changing the irradiation amount by the illumination means is provided, and during the vibration control, the irradiation amount is changed to the wide-angle side or the irradiation amount is changed according to the output of the detection means at that time. ing.

Therefore, the illumination unevenness due to the illumination means by activating the image stabilizing function is eliminated, and it is possible to obtain an image that is always illuminated uniformly.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main configuration of an embodiment when the present invention is applied to a single-lens reflex camera.

FIG. 2 is a block diagram showing a configuration of main parts arranged in the interchangeable lens of FIG.

FIG. 3 is a diagram showing output waveforms of an anti-vibration switch and an irradiation angle varying motor shown in FIGS. 1 and 2.

4 is a diagram showing an output waveform of the angular velocity sensor 23 of FIG. 2 after passing through an integrator 25. FIG.

5 is a flowchart showing an operation on the camera side of FIG. 1. FIG.

FIG. 6 is a flowchart showing an operation on the lens side of FIG.

FIG. 7 is a diagram for explaining a problem of a conventional device.

[Explanation of symbols]

 1 strobe 2 irradiation angle variable motor 3 driver circuit 4 encoder 5 light emitting circuit 6 control circuit 12 camera microcomputer 22 correction optical system 23 angular velocity sensor 29 anti-vibration microcomputer 30 anti-vibration switch 33 lens microcomputer

Claims (5)

[Claims] 1. An illuminating means for illuminating an object, an illuminating angle setting means for changing an illuminating angle of the illuminating means according to a focal length of a lens, a detecting means for detecting an external force applied to the device, and the detecting. In an optical device provided with a vibration isolation means having a correction optical system, which keeps the optical axis of the lens constant based on the output of the means, when the vibration isolation means operates,
An optical device comprising an irradiation angle control means for correcting the irradiation angle setting by the irradiation angle setting means according to the output of the detection means. 2. The irradiation angle control means is a means provided with a correction amount calculation means for calculating a correction amount so as to widen the irradiation angle to the wide angle side in accordance with the magnitude of the output of the detection means. The optical device according to claim 1. 3. The optical apparatus according to claim 2, further comprising irradiation amount varying means for changing the irradiation amount of the illumination means according to the output of the correction amount calculating means. 4. The irradiation amount varying means is means for increasing the irradiation amount of the illumination means as the correction amount calculated by the correction amount calculating means increases. Optical equipment. 5. The optical device according to claim 2, wherein the irradiation angle control means is means for setting the irradiation angle to the maximum wide-angle position when the output of the detection means exceeds a predetermined amount.