JP2612711B2 - camera - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a camera having a variable power optical system.

[Prior Art] In recent years, zoom lenses have been widely used in 35 mm silver halide cameras and video cameras.

In addition, the zoom ratio of the zoom lens is increasing.

[Problems to be solved by the invention] However, when using a zoom lens having a high magnification,
If it is unknown at what magnification the image is currently being taken, the angle of view as the imageable area cannot be changed smoothly, and there is a problem in using a zoom lens. In particular, in a telephoto camera aiming at a rapidly moving subject or a video camera recording a moving image, recognition of a shooting magnification is an important problem.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a camera that can always recognize a photographing magnification and a photographable area during photographing.

[Means for Solving the Problems] In order to achieve the above object, according to the present invention, a zoom lens that changes a photographing magnification by moving in a photographing optical axis direction, and a magnification is changed by the zoom lens. An image sensor that captures a subject image and converts the image into an electric signal; an electronic viewfinder for displaying the subject image scaled by the zoom lens; and an electric signal obtained by the image sensor. A signal processing unit for converting to a displayable state, a display signal generator for generating an information signal regarding a current imaging magnification and a maximum magnification based on the position of the zoom lens, and the current imaging magnification and the current imaging magnification obtained by the display signal generator. An information signal relating to the highest magnification is superimposed on the signal output from the signal processing unit and displayed on the electronic viewfinder. And information on the current photographing magnification and the maximum magnification is displayed together with the subject image on the electronic viewfinder.

[Embodiment] FIG. 1 is a block diagram showing a schematic configuration of a main part of a camera-integrated video tape recorder as one embodiment of a camera according to the present invention, and FIGS. 2 and 3 show the embodiment of FIG. FIGS. 2A and 2B show examples of display in the viewfinder. FIG. 2A shows a display example at the time of 2 × photographing, FIG. 2B shows a display example at the time of 7 × photographing, and FIG. FIG. 4 is a perspective view showing a schematic configuration of a driving unit and a sensor unit of the zoom lens. A in FIG. 3 shows an area for displaying the angle of view at the highest magnification (× 8), B shows an area for displaying the angle of view at 7 times, and C shows an area for displaying the angle of view at 6 times. (D) is a view showing a view angle display at the time of 5 times.

In the apparatus shown in FIGS. 1 and 4, when the magnification of the optical system is increased to 8, the image of the subject 1 is collected via the optical system 2 into the CCD 3 serving as an image sensor. The image formed on the CCD 3 is converted into an electric signal. The electric signal is subjected to signal processing by a signal processing unit 4 of the camera, and is recorded by a recorder unit 5. On the other hand, an optical image incident on the zoom magnification detection sensor 7 from the subject 1 via the optical system 2 and the zoom optical drive system 6 is detected by an encoder including a rotation angle detector of the sensor 43 shown in FIG.
A numerical value corresponding to this detected value on a one-to-one basis is stored in a lens control circuit 8.
The character is read out from the ROM table inside and displayed by the display signal generator 9 at a zoom magnification corresponding to the optical image. Is generated and a superimposed signal is generated.
It is displayed on an EVF (electronic viewfinder) 11 together with the detection value of the sensor 7 by superimposition.

In FIG. 4, reference numeral 40 denotes a zoom lens barrel, 41 denotes a lens unit, 42 denotes a zoom drive gear, 43 denotes a sensor, 44 denotes a variable power cam, 45 denotes a focus correction cam, 46 denotes a drive gear, and 47 denotes a reduction gear. The box 48 is a zoom drive motor. In the configuration of FIG. 4, by operating a switch (not shown),
When the zoom drive motor 48 starts rotating in the forward or reverse direction, the rotation rotates the drive gear 46 via the reduction gear box 47, and the zoom drive gear meshing with the drive gear 46 rotates, At the same time, the lens group moves via the variable power cam 44 engraved on the zoom lens barrel to change the magnification. Since the focal length changes with the change in magnification, the lens group is corrected via the focus correction cam 45 to correct the focal length. In addition, the above change in magnification depends on the zoom drive gear.
It is detected via a sensor 43 which is an encoder that meshes with. As described above, the change in the magnification is simultaneously displayed on the EVF 11 by superimposition.

The display screen may be as shown in FIG. 3 in addition to FIGS. 2 (a) and 2 (b). In particular, FIG. 3 (d) shows the current magnification (in this case, × 5). is there.

[Effects of the Invention] As described above, the camera of the present invention can always check the current use magnification during use, so that the magnification can be changed very smoothly. For this reason, it is particularly effective, for example, in video shooting or telephoto shooting with a single-lens reflex camera.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a main part of an embodiment of a variable power optical apparatus according to the present invention. FIGS. 2 and 3 are views showing display examples in the embodiment of FIG. The figure is a perspective view showing a schematic configuration of a drive unit and a sensor unit of the zoom lens. In the figure. 1: Object, 2: Optical system 3: CCD, 4: Signal processing unit 5: Recorder, 6: Optical drive system for zoom 7: Zoom magnification detection sensor 8: Zoom control circuit 9: Display signal generator 10: Adder

Claims (1)

(57) [Claims] A zoom lens for changing a photographing magnification by moving in a photographing optical axis direction;
An image pickup element for converting an electric signal into an electric signal; an electronic viewfinder for displaying a subject image scaled by the zoom lens; and a signal for converting an electric signal obtained by the image pickup element to be displayable on the electronic viewfinder. A processing unit, a display signal generator that generates an information signal regarding a current imaging magnification and a maximum magnification based on the position of the zoom lens, and an information signal regarding the current imaging magnification and the maximum magnification obtained by the display signal generator. And superimposing means for superimposing on a signal output from the signal processing unit and displaying the signal on the electronic viewfinder. On the electronic viewfinder, the information on the current shooting magnification and the highest magnification is A camera which is displayed together with a subject image.