JPH05333406A - Camera provided with pseudo zoom photographing function - Google Patents

Abstract

PURPOSE:To save power by changing the focal distances of both a finder and a photographing lens in the case film is loaded in response to the intention of changing the focal distance and changing only the finder in the case the film is not loaded. CONSTITUTION:The existence of the film is checked in response to the on/off of a cartridge detecting switch S6. When the film does not exist, a camera is restored to a stop state, and when the film exists, the focal distance of the photographing lens is calculated based on the position of the finder and electronic zoom magnification, and a lens zoom driving mechanism 33 is driven. Namely, the existence of the film is checked, and only the zoom driving mechanism 23 of the finder part 21 is driven to execute the zoom-in and the zoom-out of the finder in the case of judging that the film does not exist, and the lens zoom driving mechanism 33 of a photographing lens part 31 is driven only when the film exists. When both a zoom-out switch and a zoom-in switch are turned off, only display data is outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a pseudo-zoom photographing function capable of independently controlling a driving operation for changing a focal length of a photographing lens and a driving operation for changing a focal length of a finder, and particularly power saving. The camera with a pseudo zoom function.

[0002]

2. Description of the Related Art Conventionally, a camera capable of pseudo-zoom photographing has been provided. In such a camera, since it is necessary to zoom only the finder system without moving the taking lens during the pseudo zoom, it is necessary to perform the zoom driving of the taking lens and the zoom driving of the finder independently.

[0003]

[Problems to be Solved by the Invention] In recent years, there has been an increasing demand for power saving of cameras. The same applies to cameras that can perform pseudo zoom photography. In a camera capable of pseudo-zoom shooting, there are cases in which only the zoom is moved to check the operation or play when no film is loaded. In such a case, although the user is looking only at the viewfinder, not only the finder but also the taking lens is zoomed. Since zooming is performed even on a taking lens that does not require zooming, power saving cannot be achieved.

The present invention has been made to solve the above problems, and an object thereof is to save power in a camera capable of pseudo zoom photographing.

[0005]

A camera with a pseudo-zoom photographing function according to the present invention is a first means for detecting a loading state of a film loaded in the camera and a driving operation for changing a focal length of a finder. The control means, the second control means for controlling the driving operation for changing the focal length of the photographing lens, the input means for the user to input the intention to change the focal length to the camera, and the detection means for detecting the input to the input means. Third control means for controlling only the first control means when it is detected that the film is not loaded, and for controlling the first and second control means when it is detected that the film is loaded Including and

[0006]

In the camera with the pseudo zoom photographing function in which the focal length of the finder and the focal length of the taking lens are changed separately, the finder and the photographing are performed only when the film is loaded according to the user's intention to change the focal length. Both focal lengths of the lens are changed, only the finder focal length when no film is loaded.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a main part of a mechanism of a camera with a pseudo zoom photographing function according to the present invention. In the figure, (A) shows a film winding / rewinding / loading mechanism, and (B).
Shows the zoom drive mechanism of the viewfinder, and (C) shows the zoom drive mechanism of the taking lens.

Referring to (A), a film winding / rewinding / loading mechanism 13 is incorporated in the film loading unit 11, a film cartridge 14 is loaded therein, and a film 16 is loaded into the film winding mechanism 15 from the film cartridge 14. To be wound up. The presence or absence of the film 16 is detected by the sensor 17 placed on the path. The film winding / rewinding / loading mechanism 13 is driven by the first motor M1 via the reduction gear system 12.

Next, referring to FIG.
Will be described. A zoom drive mechanism 23 is incorporated in the finder section 21 to perform a zoom operation of the finder section 21. The zoom drive mechanism 23 is driven by the second motor M2 via the reduction gear system 22.

Next, the zoom drive unit of the taking lens will be described with reference to FIG. The photographing lens unit 31 incorporates a fourth motor M4 for changing the focal length of the photographing lens. The fourth motor M4 is controlled via the lens zoom drive mechanism 33, and the lens zoom drive mechanism 33 is driven by the speed reduction system 32.
It is driven by the third motor M3 via.

As described above, in the camera with the pseudo zoom photographing function, the finder unit 21 and the photographing lens unit 31 are individually driven to perform zooming.

FIG. 2 is a block diagram of a control circuit of the camera with the pseudo zoom photographing function according to the present invention. The contents of the control circuit will be described with reference to FIG. The entire camera is controlled by a microcomputer CP, and the microcomputer CP measures a brightness of an object, a metering section LM, a distance measuring section AF that measures an object distance and performs focus detection, and a display control section DS that displays information on camera shooting. , A flash control unit FLS for controlling the flash emission is connected. The microcomputer CP further includes the first motor M1 and the second motor M described in FIG.
2, a motor driving unit AC for driving the third motor M3
And a magnetic head drive unit HDD which is connected to the fourth motor M4 described in FIG. 1 and includes an exposure control unit EX for performing exposure control and a magnetic head HD for reading and writing information on the magnetic recording medium on the film. To be done.

The following switches are connected to the microcomputer CP to carry out a desired operation. That is, the operation of the camera body is started by turning on the main switch S0. Metering / distance measuring switch S1
When is turned on, photometry / distance measurement is performed, and when the release switch S2 is turned on, a release operation is performed. When the zoom-out switch S3 is turned on, the zoom lens is driven from the telephoto side to the wide-angle side, and when the zoom-in switch S4 is turned on, the zoom lens is driven from the wide-angle side to the telephoto side. The back cover switch S5 is a switch for detecting opening / closing of the back cover of the film loading section, and is turned on when the back cover is closed. The cartridge detection switch S6 is a switch for detecting the presence / absence of a film cartridge and is turned on when there is a film cartridge. Flash switch S7 is ON
Then the flash turns on.

Further, the microcomputer CP includes a finder zoom encoder EN1 for detecting the position of the zoom lens of the finder unit 21, a lens zoom encoder EN2 for detecting the position of the zoom lens of the photographing lens unit 31, and a perforation detecting photo reflector. Information from the PR is also entered.

Next, the operation of the camera with the pseudo zoom photographing function according to the present invention will be described with reference to FIG. When the back cover S5 is turned on to close the back cover of the camera in the stopped state (step # 11, the following steps will be abbreviated) (Y in # 13), the process proceeds to the film loading routine (# 17). Next, the main switch S0 is turned on.
It is judged whether or not the release operation is possible (# 15), and if the release operation is possible (# 15).
Y), the display data output is turned on and the information necessary for photographing is displayed on the display unit (not shown). It is determined whether or not the photometry / distance measurement switch S1 is pressed, and if it is not pressed, the zoom drive mechanism 23 of the finder is driven according to ON / OFF of the zoom-out switch S3 and the zoom-in switch S4. Zoom-out or viewfinder zoom-in is performed (# 25- # 31). Then, in # 35, the presence / absence of a film is checked according to ON / OFF of the cartridge detection switch S6, and if there is no film, the camera returns to the stopped state (# 11). When it is determined that there is a film in # 35, the focal length of the taking lens is calculated from the position (focal length) of the finder and the electronic zoom magnification (# 3
7), the lens zoom drive mechanism 33 is driven based on the data of the lens focal length F, and the display data is output (# 35- # 39). That is, in # 33, the presence or absence of a film is checked, and when it is determined that there is no film, only the zoom drive mechanism 23 of the finder unit 21 is driven to zoom in and zoom out of the finder, and only when there is a film, Shooting lens unit 31
The lens zoom drive mechanism 33 is driven.

When both the zoom-out switch S3 and the zoom-in switch S4 are OFF, only the display data is output (S39), and the camera returns to the stopped state (# 11).

When the photometry / distance measurement switch S1 is turned on in # 21, photometry of the object is carried out, the photometry / distance measurement switch is kept on, and the release switch S2 is turned off.
The focus detection, lens drive, and exposure control are performed only when N is selected (Y in # 43 and # 45, # 47 to # 51). Next, shooting information such as shooting conditions is recorded at a predetermined position on the film via the magnetic head HD, the film is wound up one frame (# 53, # 55), and the process proceeds to # 39.

In the above embodiment, the case where the presence or absence of the loading of the film cartridge or the film is detected by using the cartridge detection switch S6 has been described, but the film detection sensor shown in FIG. Alternatively, a signal from the photoreflector PR for detecting perforation 17 or the film may be used.

Further, in the state where there is no film, only the finder portion of the taking lens is zoomed at the wide-angle end. Since it is performed at the wide-angle end of the lens, zooming is performed in a state in which the F value of the lens is bright, so that the frequency of flash emission at the time of release with play is minimized.
As a result, power saving can be achieved.

[0020]

As described above, according to the present invention, according to the user's intention to change the focal length, the focal lengths of both the viewfinder section and the photographing lens are changed only when the film is loaded, and the film is changed. When not in use, only the focal length of the viewfinder is changed, so only the zoom system of the viewfinder is zoomed when checking the operation and playing by moving the zoom without the film. It is possible to save electricity. Further, since the battery life is extended, the battery can be downsized, and the camera can be made more compact.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of a mechanical portion of a camera with a pseudo zoom photographing function according to the present invention.

FIG. 2 is a block diagram of a control circuit unit.

FIG. 3 is a flowchart for explaining the operation of the camera with the pseudo zoom photographing function according to the present invention.

[Explanation of symbols]

 21 viewfinder section 23 zoom drive mechanism 31 shooting lens section 33 lens zoom drive mechanism CP microcomputer S6 cartridge detection switch

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location G03B 5/00 Z 7513-2K

Claims (1)

[Claims] 1. A detection means for detecting a loading state of a film in a camera, a first control means for controlling a driving operation for changing a focal length of a finder, and a second control means for controlling a driving operation for changing a focal length of a photographing lens. The control means, the input means for the user to input the intention to change the focal length to the camera, and the detection means in response to the input to the input means, when the detection means detects that the film is not loaded. A camera with a pseudo zoom photographing function, which includes only a first control unit and a third control unit which controls the first and second control units when it is detected that the film is loaded.