JPH0263032A - Camera - Google Patents

Abstract

PURPOSE:To eliminate need of varying the power of zoom lens just before a shutter is released and to reduce the consumption of a power source by detecting variable power data from the position of a variable power lens in a finder, and varying the power of the zoom lens based on data on the variable power of the finder together with the pressing operation of a shutter button. CONSTITUTION:A driving signal from a motor 43 is transmitted to a driver 44 from a CPU 34, and the variable power lens 37 is moved to determine a desired magnification. Then, a variable power detecting circuit 45 transmits the position of the variable power lens 37 as data on the variable power of the zoom finder 10. The CPU 34 drives a focusing mechanism based on range finding data from a photodetector 12, focuses and locks the focal point. As a movable cylinder 5 moves, the top of a brush 30 slides on the surface of a contact plate 28, and the position of the movable cylinder 5 is transmitted as data on the variable power of the zoom lens 4 to the CPU 34. When the data corresponds to data on the variable power of the zoom finder 10, a motor 26 is stopped. Thus, although the camera is provided with an electric zoom lens, its consumption of a power source can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a camera using a zoom lens as a photographing lens and a zoom finder as a finder.

[Conventional technology]

Some recent compact cameras use electric zoom lenses as photographic lenses. In such cameras, a zoom finder is also normally used as the finder. The zoom finder also changes magnification in conjunction with the zooming of the photographic lens, so that a finder field of view corresponding to the angle of view of the photographic lens can be obtained.

[Problem to be solved by the invention]

By the way, when taking pictures with the above-mentioned camera, it is customary to repeat the zooming operation many times in order to find the optimal angle of view just before taking pictures. However, such an operation requires frequent driving of the motor for driving the electric zoom lens and the zoom finder, resulting in a problem in that the camera's power source is consumed rapidly.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a camera that is equipped with an electric zoom lens and that consumes less power.

[Means to solve the problem]

In order to achieve the above object, in the camera of the present invention, the magnification change detection means detects the magnification change data from the position of the magnification change lens that changes the magnification of the finder, and based on this magnification change data, the zoom lens magnification change The means is configured to change the magnification of the photographing zoom lens in conjunction with the pressing operation of the shutter button.

[Effect]

According to the above configuration, first, the magnification of the finder is arbitrarily changed to search for the optimum angle of view for photographing, but during this time the magnification of the photographing zoom lens is not changed. Once the angle of view is determined, press the release button. At this moment, the zoom lens for photographing is automatically changed in magnification based on the magnification data of the finder, and then the shutter is opened and closed to take a photograph.

Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

In FIG. 2 showing a camera 1 according to an embodiment of the present invention, a fixed barrel 3 is attached to the front surface of a camera body 2, and a movable barrel 5 holding a zoom lens 4 for photographing is incorporated into the fixed barrel 3 so as to be able to move forward and backward. It is.

Above the fixed barrel 3 is a finder window 6. Distance measurement windows 7a and 7b for autofocus and a photometry window 8 are provided. Behind the finder window 6 is a zoom finder 1, which will be described later.
0 (see Figure 1) is built-in. In addition, the distance measuring window 7a
, 7b, there is a light emitting element 11. for distance measurement. Light receiving element 12 (
(see Figure 1) is stored. Also, at the back of the photometry window 8, there is an EE sensor (for example, 5PD) that measures the brightness of the subject.
) 13 (see Figure 1) is stored.

The zooming seesaw knob 14 is normally in the neutral position shown. When the index "TJ side" is pressed, the zoom finder 10 is magnified toward the telephoto side only while the index "TJ side is pressed. When the index "Wj side is pressed, the magnification is changed toward the wide-angle side. If the pressure on the seesaw knob 14 is released during magnification, the zoom finder 10 stops changing the magnification at that point.A shutter button 15 is also provided on the top surface of the camera body 2.

In FIG. 1, which schematically shows the structure of the camera l, a focusing lens, a focusing mechanism, a shutter mechanism, and a second lens 17 provided at the rear end are rotatable at the inside front of the movable barrel 5. A shutter block 16 having a built-in aberration correction mechanism for correcting various aberrations is fixed. Further, a rear group lens 18 for imaging is fixed to a partition plate 20 provided behind the second lens 17 and separated from the film chamber. This rear lens group 18 is relatively moved in and out of the rear end of the movable barrel 5 when the movable barrel 5 is advanced or retreated, and the power of the zoom lens 4 is changed.

A protrusion 22 is integrally formed on the outer periphery of the movable cylinder 5, and a screw hole 22a is formed in this protrusion 22. A linear screw 23 for moving the movable tube 5 in the optical axis direction is engaged with this screw hole 22a.

This straight screw 23 connects the fixed cylinder 3 and the partition plate 20.
A spur gear 24 is attached to the end of each of the partition plates 20. A zooming motor 26 is meshed with this spur gear 24 via a pinion gear 25°. Further, a contact plate 28 made of a thin metal plate formed into a pattern is bonded to a part of the outer circumference of the movable cylinder 5, and a brush 30 that comes into contact with this contact plate 28 to detect the position of the movable cylinder 5 is attached. It is provided at the base 19a of the lens barrel 19.

The motor 26 includes a driver 3 for driving the motor 26.
A CPU 34 is connected via 1.

This CPU 34 is operated according to a sequence program written in the program ROM 33. Also, C
The PU 34 includes the light emitting element 11° and the light receiving element 12. EE
Sensor 13. Seesaw knob 14, shutter button 15.
A shutter block 16 and a brush 30 are connected.

The zoom finder 10 includes an objective lens 36° and a variable magnification lens 37. Correction lens 38. It consists of a 39° reticle and an eyepiece 40. The variable magnification lens 37 is attached to the lens frame 4
1 and is moved forward and backward along the finder optical axis by a moving mechanism (not shown) driven by a motor 43. A driver 44 controlled by the CPU 34 is connected to the motor 43. Further, a variable magnification detection circuit 45 is connected to the variable magnification lens 37, which converts its position into an electrical signal to detect the magnification of the zoom finder 10.

Next, the operation of the camera I of the present invention constructed as described above will be explained with reference to FIGS. 1 to 3.

First, a film is loaded into the film chamber of the camera 1, and the zoom lens 4 is directed toward the subject. While observing the subject through the zoom finder IO, the user operates the seesaw knob 14 to find a desired magnification. As a result, a drive signal for the motor 43 is sent from the CPU 34 to the driver 44, and the variable power lens 3
7 is moved. Once the desired magnification is determined, release the seesaw knob 14. The magnification change detection circuit 45 sends the position of the magnification change lens 37 to the CPU 34 as the magnification change data of the zoom finder 10.

When the shutter button 15 is pressed halfway, the distance measurement windows 7a and 7b
A light emitting element 11° and a light receiving element 12 for distance measurement provided at the back of the
is activated and performs distance measurement. The CPU 34 drives the focusing mechanism based on the distance measurement data from the light receiving element 12, performs focusing, and locks the focus. After that, decide on the composition and press the shutter button 15 again. The CPU 34 controls the motor 26 via the driver 31.
is driven to move the movable cylinder 5.

As the movable barrel 5 is moved, the tip of the brush 30 slides on the surface of the contact plate 28, and the position of the movable barrel 5 is sent to the C:PU 34 as variable power data of the zoom lens 4. C.P.
U34 refers to the variable power data of the zoom finder 10, and when this and the variable power data of the zoom lens 4 match, stops the motor 26 and rotates the second lens 17 to correct various aberrations. Let it happen. The next moment, CP
The U 34 drives the shutter mechanism based on the photometric data from the EE sensor 13, opens and closes the shutter, and then returns the zoom lens 4 to its home position, for example, to the wide-angle side shown in FIG. 1, to complete the photographing.

Note that the method of changing the magnification of the zoom finder may be a method by moving the objective lens. Further, the magnification of the zoom finder may be changed manually by 4 degrees.

〔Effect of the invention〕

As described above, according to the zoom mechanism of the present invention, the magnification data is detected from the position of the variable magnification lens in the finder, and in conjunction with the pressing operation of the shank button, the zoom lens for I-most shadow is moved to the variable magnification lens in the finder. To provide a camera that consumes less power even though it is equipped with an electric zoom lens, by changing the magnification based on data, so that there is no need to change the magnification of the first shadow zoom lens until just before the shutter is released. You will be able to do this.

[Brief explanation of the drawing]

FIG. 1 is a block diagram schematically showing an embodiment of the present invention. FIG. 2 is a perspective view showing the external appearance of the embodiment shown in FIG. FIG. 3 is a flowchart adopted in the embodiment shown in FIG. 4 ・ ・ 10 ・ 34 ・ 45 ・ Zoom lens Zoom finder PU Magnification change detection circuit. 1... Camera (Norahoden)

Claims (1)

[Claims] (1) A finder that changes magnification by moving some of the lens groups on the optical axis, and a variable magnification detection that converts the moving position of some of the moving lenses into an electrical signal to detect the change in magnification of the finder. Based on the magnification data from the magnification detection means and the magnification change detection means,
A camera characterized by comprising a zoom lens magnification changing means for changing the magnification of a photographing zoom lens in conjunction with a pressing operation of a shutter button.