JP2987100B2 - camera - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a camera, and more particularly to the display of an index in a finder according to a camera shake. 2. Description of the Related Art In recent years, cameras have been equipped with an automatic focusing (AF) mechanism,
Automatic exposure (AE) mechanisms and the like are mounted, and the function of these mechanisms has greatly reduced the problem of photographing failure due to operational problems such as exposure errors and out-of-focus. [0003] However, since a camera normally shoots with a hand, there is a problem of a failure in shooting due to camera shake, and this point remains as a problem that cannot be solved even by mounting the above mechanism. The conventional countermeasures against the photographing failure due to the camera shake are actually the know-how (skill) in handling the camera which is passed down from experienced persons and experts.
However, since it is difficult for a person who actually uses the camera to understand the camera, and since various mechanisms such as the AF mechanism and the AE mechanism described above are being mounted on the camera, the focal length, the exposure, etc. For example, children who do not have the judgment about common sense knowledge required for shooting, such as children, are increasingly using the camera. Measures for failure are being required. In order to prevent such camera shake, as a means added to a camera for preventing the camera shake or issuing a camera shake warning, a shutter speed of, for example, 1/100 is conventionally used.
In some cases, the camera shake warning lamp is turned on under the condition that the time is 30 seconds. [0006] However, such a uniform warning based on the shutter speed criterion is merely a caution, and it is difficult to determine whether or not a camera which is actually held has a camera shake which may lead to a shooting failure. The photographer cannot judge. Therefore, there is an inevitable disadvantage that the photographing is stopped while the photographing is properly performed, or the photographed image is blurred as a result even if the photographing is performed with care. SUMMARY OF THE INVENTION It is an object of the present invention to alert a user to image blur by displaying the state of the image blur so that the user can easily grasp it. It is another object of the present invention to provide a camera capable of preventing the occurrence of image blur. [0008] An arrangement for realizing the object of the present invention comprises a finder optical system and an optical path arranged in the optical path of the finder optical system.
A fixed first index in the viewfinder.
First index forming means for forming, and the finder
It is placed outside the optical path of the optical system, and the image blur state
At least two-dimensional with respect to the fixed index according to
The second index moving relatively to the camera is determined by a predetermined moving means.
A second for forming by moving with respect to the body;
Formed by the index forming means and the second index forming means.
The image forming the second index is displayed on the finder optical system.
A guiding means for guiding the light into the optical path of the system . (First Embodiment) FIG. 1 is a diagram showing a configuration of a camera with a camera shake display function according to a first embodiment of the camera of the present invention. In FIG. 1, reference numeral 1 denotes an objective lens, and reference numeral 2 denotes an eyepiece. These components constitute a finder optical system. Reference numeral 3 denotes an optical axis of the finder optical system. Reference numeral 9 denotes a half mirror which is disposed in the middle of the optical path of the finder optical system. Reference numeral 5 denotes a gyro disposed near the finder. The gyro 5 is suspended and supported by a gimbal mechanism 6, and a mirror 7 is attached to the tip of the gyro 5. Note that the position of the mirror indicated by reference numeral 7 in the drawing indicates a state in which the camera does not tilt as a reference position. In this example, the gyro and gimbal mechanisms constitute a tilting mechanism for detecting the tilting of the camera. In order to set the mirror 7 at the reference position as described above, a means for locking (not shown) the axis of the gyro frame so as to coincide with the optical axis of the finder is usually provided. Before starting the shooting operation, rotate the frame and start aiming the camera at the subject.
It can be given by performing the operation of releasing the lock. A control circuit for providing such a series of operations can be configured by combining a microcomputer built in the camera with a switch externally operable. Reference numeral 8 denotes a point light source such as an LED fixed to a fixing portion of the camera body. The light (light source light) reflects off the mirror 7 on the front face of the gyro, and further reflects the half mirror 9
After reflecting the light, the eyepiece 2 coincides with the optical axis of the finder.
Through which the point light source image can be seen from the finder. The light source can be replaced with a light source configured to illuminate the indicator with a lamp or external light, for example. In this embodiment, a half mirror 12 is arranged in the middle of the mirror 7 and the half mirror 9, and a mark on a mark plate 13 fixed to a fixed portion of the camera body (in this embodiment, the center of the viewfinder optical axis is shown in FIG. 2). The indicated circle mark 23) is displayed in the viewfinder. This mark 2
3 can be set to indicate, for example, an allowable range of the camera shake amount. According to this, it is easy to visually determine whether or not the camera shake does not hinder actual shooting. In doing so, this is one of the efforts aimed at suppressing camera shake. In this embodiment, a point light source for producing a light source image indicating the state of camera shake is also used as an illumination system for the mark 23.
Is arranged around the finder screen 21 so that the image of the mark plate 13 is projected on the finder screen 21 via the half mirrors 12 and 9. FIG. 2 shows a finder screen 21. The above-mentioned circular mark 23 is displayed at the center of the finder screen 21. If this mark is also used as a mark indicating the auto-focusing distance measurement range, the finder becomes simple. Alternatively, the color may be changed. When photographing is performed using the camera of the first embodiment having the above-described configuration, the mirror 7 supported by the gyro 5 has a posture perpendicular to the finder optical axis at the illustrated reference position. Assuming that the lock with the camera body is released, the gyro 5 supported by the gimbal mechanism 6 described above has its axis with respect to the absolute space even if the camera tilts due to its nature. Maintain a posture that has been maintained in a certain direction. Therefore, if vibration or angular displacement occurs in the camera in this state, relative tilting occurs between the camera body and the mirror 7. And this relative tilt is
This appears as a movement of the light source light image 22 which is a projection image of the point light source 8 onto the finder screen 21. The random trajectory shown inside and in the vicinity of the circular mark 23 at the center of the finder screen 21 in FIG. 2 is an example of the movement of the light source light image 22. This movement is performed according to the set dimensions between the point light source 8, the mirror 7, the eyepiece 2, and the like.
It can be enlarged and displayed above, and in this example, this is about 2
The camera shake is emphasized by setting it to be doubled to make it easier for the photographer to grasp the camera shake. The locus of movement of the light source light image 22 is difficult to see if the finder screen is bright. Therefore, in a practical example, the brightness of the outside world is measured using a photometric system (not shown). It is preferable to vary the current flowing through the LED, which is a point light source, in proportion to the brightness, and adjust the brightness. (Second Embodiment) FIG. 3 is a schematic view showing a camera according to a second embodiment of the present invention. The structures of the objective lens 1, the eyepiece lens 2 and the half mirror 9 are the same as those of the first embodiment shown in FIG. The structural feature of this example is that a lens 3 is attached to a gyro 31 supported by a gimbal mechanism (not shown) by an arm 32.
The light from a point light source 8 such as an LED is projected by a negative lens mirror 34 and then a projection lens 35, and is introduced into the finder optical path by a half mirror 9 as in the example of FIG. There. In such a configuration, when camera shake occurs, the axis of the gyro 31 and therefore the axis of the lens 33 is tilted with respect to the finder optical system, and the light source light is deflected by the negative lens. Is moved on the finder screen. The lens 33 may be either a negative lens or a positive lens. The magnification of camera shake can be selected by the focal length of the lens and the length of the arm 32, and the camera shake can be selected by the afocal magnification of the projection lens 35. The magnification can be selected. If the photographing lens is of a variable magnification, if the projection lens is a variable magnification system as shown in the drawing, the magnification is changed, and in the telephoto mode, the camera shake is enlarged and projected. It is also possible to warn the occurrence of a camera shake within an allowable limit of the camera shake which is always constant according to the deflection of the shooting mode. The projection lens 35 can be arranged in the optical path of the finder optical system. In this case, the finder optical system can be configured as a variable power system, and at the same time, the magnification of the camera shake can be reduced. It may be configured as a changing mechanism. In the present embodiment, the figures 36 and 37 written on the inner surface of the eyepiece 2 are displayed on the objective lens 1 in order to display the frame (frame) of the finder and the mark for allowing camera shake.
The light is reflected by the inner surface of the lens and is performed in an avatar manner. (Third Embodiment) FIG. 4 is a schematic diagram showing a camera according to a third embodiment of the present invention. In the third embodiment, the point light source 8 is suspended by a spring 41 or the like, and is introduced from the projection lens 42 through the mirror 34 into the optical path of the finder optical system. Also in this example, the light source shakes due to the camera shake occurring in the camera, thereby causing the movement of the light source image on the finder screen and observing the camera shake trajectory on the finder screen. It is preferable to provide an appropriate lock device for locking the swing of the light source suspended by the spring before the start of the photographing operation. The present invention is not limited to the configuration of the above-described embodiment in which a member for directly deflecting the optical path by the gyro is used. For example, a means for detecting camera shake such as an acceleration sensor may be used. It is needless to say that a method in which the optical path deflecting member is driven via an actuator which is provided in the camera and driven by this output may be employed. The image deflecting means of the optical system may be driven by an actuator to display an image of a device that performs image stabilization. In this case, it is preferable that the image blur corrected by the image stabilization is corrected and displayed by a finder. The present invention as described above is applicable as an apparatus for displaying a finder such as a lens shutter camera, a single-lens reflex camera, a still video camera, a video camera, etc., and a zoom lens whose focal length is changed by switching lenses. In such a case, it is practically preferable to provide a means for detecting focal length information and change the magnification of the camera shake trajectory in accordance with the use. Instead of changing the enlargement rate of such a camera shake locus, changing the magnification of projecting the size of the mark indicating the allowable range to the finder or electrically changing the mark chart by using a liquid crystal or the like, The change may be made by mechanically changing the size of the frame, or by changing the display magnification of the mark. If it is not necessary to display the above-mentioned camera shake and the display becomes a hindrance, it is needless to say that the display may be stopped by turning off the light source electrically. . In addition to the camera shake, the camera behaves differently when the shutter button is pressed, in addition to holding the camera. The invention also has a feature that it can respond effectively. That is, for example, if a means such as a manual switch for releasing the interlocking of the shutter mechanism by operating the shutter button is provided so that the camera shake state when the shutter operation is performed in the released state can be confirmed with the finder, the above-described problem occurs. Can be conveniently handled. (Correspondence between the Invention and the Embodiment) In the above embodiment, the objective lens 1 and the eyepiece 2 are connected to the viewfinder optical system of the present invention by the graphic 36 or 37.
The first index forming means according to the present invention comprises a point light source 8, a gyro 31 and an arm 32, the second index forming means according to the present invention, and the half mirror 9 according to the present invention. They correspond to guidance means, respectively. According to the invention of the present application, an image serving as an index can be moved in the finder relative to, for example, the optical axis of the finder according to the image blur, and the effect of the image blur can be reduced. Can be prevented. Further, since the index forming means for forming the index which moves in accordance with the image blur state is arranged outside the finder optical path, the degree of freedom of arrangement for forming the index is high, and the area around the finder is compact. And the size of the camera can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a camera with a camera shake display function according to a first embodiment of the present invention. FIG. 2 is a diagram showing a deflection state of light from a light source appearing in a viewfinder of FIG. 1; FIG. 3 is a schematic configuration diagram of a camera with a camera shake display function according to a second embodiment of the present invention. FIG. 4 is a schematic configuration diagram of a camera with a camera shake display function according to a third embodiment of the present invention. [Description of Signs] 1 ... Objective lens 2 ... Eyepiece 3 ... Finder optical axis 5 ... Gyro 6 ... Gimbal mechanism 7 ... Mirror 7 '... Fixed mirror 8 ... Point light source 9 ... Half mirror 11 ... Frame plate 12 ... Half mirror 13 … Mark plate

Claims (1)

(57) [Claims] Finder optical system and in the optical path of the finder optical system
That is fixed in the viewfinder
A first index forming means for forming a first index;
It is located outside the optical path of the viewfinder optical system.
Therefore, the fixed index may be slightly reduced depending on the image blur state.
The second index, which moves relative to at least two dimensions, is determined by a predetermined shift.
Formed by moving the moving means with respect to the camera body
And second index forming means for performing
The image forming the second index, formed by the means,
A camera having guide means for guiding the light into an optical path of a finder optical system .