JPH0829840A - Camera - Google Patents

Abstract

PURPOSE:To prevent the photographing by a visual field of finder not intended by a photographer, by switching the optical magnification of a finder optical system to first optical magnification, when the turning off of a main switch is detected. CONSTITUTION:A switch 15 is turned on when an erector lens 5 is in a normal photographing position (first position) and turned off except that time and a switch 16 is turned on when the erector lens 5 is in a telescopic mode position (second position) and turned off except that time. A microcomputer 10 detects the state of the telescopic changeover switch 16 to discriminate that it is in a normal photographing mode state or a telescopic mode state. When the power of the camera is tuned off in a state where the erecctor lens 5 is moved from the first position to the second position 5' in accordance with the operation of the photographer, the lens 5 is switched to the first position. Therefore, when the power is turned off, the optical magnification is switched to the first optical magnification and when the power is turned on again, a start, from the first optical magnification is always obtained.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention can select at least a second optical magnification for displaying a range irrelevant to the first optical magnification for displaying the shooting range of a photographing optical system. The present invention relates to an improvement of a camera equipped with a simple finder optical system.

[0002]

2. Description of the Related Art In recent years, various functions are remarkable in cameras, and not only can they take pictures, but they are also provided with other functions. As an example, Japanese Patent Application No. 3-4
No. 6129 proposes that a part of the finder optical system is moved and inverted to change the optical magnification to have a function as a telescope.

[0003]

However, in the above-mentioned conventional example, when the finder optical system having the telescope function is used and the telescope function is used, the optical system is different from the optical system in the normal photographing. In other words, if the second optical magnification selected when using the telescope function is erroneously set, the finder optical system has nothing to do with the photographing range of the zoom photographing optical system, the one as seen in the finder It is not possible to take a picture of the object, which causes an inconvenience that the intended picture cannot be taken.

An object of the present invention is to provide a camera which prevents photography from being performed by a viewfinder field not intended by the photographer.

[0005]

A camera for realizing the object of the present invention displays a photographing optical system and a photographing range by the photographing optical system as described in claim 1 of the claims. And a finder optical system for displaying a range unrelated to the first optical magnification for displaying the shooting range of the shooting optical system and the shooting range of the shooting optical system. In a camera configured to be at least selectable as the second optical magnification, a detection unit that detects whether or not the second optical magnification is selected as the optical magnification of the finder optical system, and the detection unit has a second When it is detected that the main switch of the camera body is turned off when the selection of the optical magnification is detected, a switching means is provided for switching the optical magnification of the finder optical system to the first optical magnification.

In this structure, when the main power supply of the camera body is turned off, the finder optical system is forcibly switched to the first optical magnification even if it is at the position of the second optical magnification, and then the main power supply is turned on. When starting shooting, the viewfinder optical system does not have the second optical magnification unrelated to shooting.

[0007]

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

FIG. 1 is a schematic diagram showing a camera having a telescope function according to an embodiment of the present invention.

In FIG. 1, a taking lens 1 including a zoom optical system has a function of focusing light from a subject on a film surface F at the time of exposure.
Driven by 7. In addition, the shooting lens 1
The light from the subject that has passed through is reflected by the main mirror 2, and then passes through the condenser lens 3, the sub-mirror 4, the erector lens 5, the field lens 6 and the eyepiece lens 7 forming the finder optical system to the eyes of the photographer. It is configured to allow the photographer to recognize the photographing range of the photographing lens 1.

The central portion of the sub-mirror 4 is semi-transparent, and a part of the light from the subject that has passed through the taking lens 1 passes through this central portion and is then reflected by the distance measuring mirror 8. , Is incident on the online sensor 9 for focus detection. The drive circuit 11 for the online sensor 9 drives the line sensor 9 according to a command from a microcomputer (hereinafter, referred to as a microcomputer) 10 installed in the camera body, and also an image signal obtained by the line sensor 9. Is taken in, amplified, and sent to the microcomputer 10.

The microcomputer 10 has an internal ROM, RA
The processing device includes an M, A / D converter, a D / A converter, and the like, and performs a series of camera operations such as automatic exposure control, automatic focus control, and film winding according to a sequence program stored in a ROM.

Between the field lens 6 and the eyepiece lens, a photometric half mirror 1 having a semi-transmissive property in the central portion.
2 is disposed and the light passing through the photometric half mirror 12 is supplied to the eyepiece lens 7 as described above.
Part of the light reflected without passing through the photometric half mirror 12 enters the photometric sensor 13. Then, photometric information is obtained by the photometric sensor 13, and the photometric information is transmitted to the microcomputer 10 and used for automatic exposure control (AE).

SW1 and SW2 are switches interlocked with a release button (not shown) and are respectively connected to the microcomputer 10. The switch SW1 is turned on when the release button is pushed down in the first stage, and subsequently the switch SW2 is pushed down into the second stage. Switch SW2 is turned on. And microcomputer 1
0 starts photometry and automatic focus adjustment operation according to ON of the switch SW1, and also performs various operations required for exposure and film winding operation by using ON of the switch SW2 as a trigger.

The taking lens 1 is provided with a lens shutter 14 which also serves as a diaphragm. The lens shutter 14 is controlled by the microcomputer 10 to regulate the amount of light passing through the taking lens 1.

Here, the eclectic lens 5 is moved from a first position indicated by a solid line to a second position (5 ') indicated by a broken line by a motor (not shown) or the like by a switch operation of a photographer. It is configured to be inverted,
By reaching this second position, the optical magnification of the finder optical system is dramatically increased, and the finder optical system serves as a telescope as a whole.

The switches 15 and 16 are switches provided by detecting the normal photographing mode state and the telescope mode state, respectively, and the switch 15 is turned on when the above-mentioned erector lens 5 is in the normal photographing position (first position).
However, the switch 16 is turned off at other times, and the switch 16 is turned on when the eclectic lens 5 is at the telescope mode position (second position), and is turned off at other times. The microcomputer 10 detects the state of the telescope changeover switch 16 and determines whether it is the normal photographing mode state or the telescope mode state.

As described above, the elector lens 5 has the second
At the position (5 '), the optical magnification of the finder optical system is dramatically increased and the telescope functions as a whole, the main purpose of which is to observe the subject.

In the above structure, in the present embodiment, when the erector lens 5 moves from the first position shown by the solid line in the figure to the second position (5 ') shown by the broken line according to the operation of the photographer. When the power of the camera is turned off, the camera switches to the first position. Next, the operation will be described with reference to the flowchart of FIG.

First, when the main switch of the camera where the power of the camera is turned on and off is turned on and the switch SW1 indicating the preparation for photographing is turned on, the DX code, T /
A switch input determination indicating shooting preparation such as a W (tele / wide) switch is performed, then various warning LEDs are turned off, and a power check (BC) for camera shooting is performed (step 201 → 203 → 204 →). 205).

As a result of the power supply check, if the voltage is below the operation guarantee voltage, a warning is displayed and the original switch SW1 is displayed.
Return to the ON standby operation (step 206 → 207 → 20)
3).

Next, as a result of the power supply check, if the voltage is higher than the operation guarantee voltage, the distance measurement and photometry operations are instructed, and the photometry based on the data input through the previous switch (at step 204). Calculate the distance measurement result (step 20)
6 → 208 → 209 → 210).

The switch SW2 for starting the photographing operation
When is turned on, AF driving of the taking lens 1 is performed, and then a series of exposure operations of opening and closing the shutter is performed (step 21).
1 → 212 → 213). Then, after the photographing operation is completed, film winding is performed (step 214). With the above, a series of operations is completed.

On the other hand, when the main switch, where the power of the camera is turned on and off, is turned off, the switch 1
The states of 5 and 16 are checked, and when the switch 16 is turned on, the eclectic lens 5 is driven so as to switch from the telescope mode position (second position) to the normal photographing position (first position) (step 201 → 202). .

According to the present embodiment, when the power of the camera is turned off while the finder optical system is used in the telescope function having a large optical magnification from the normal photographing, the photographing mode is switched to the normal photographing mode. Has the effect of prohibiting unintentional photography.

[0025]

As described above, according to the present invention,
When the second optical magnification that is different from the first optical magnification for displaying the shooting range of the shooting optical system is selected as the optical magnification of the viewfinder optical system, when the power of the camera is turned off, When switching to the first optical magnification and turning on the power of the camera again, the first symptom always starts from the optical magnification, so it is possible to eliminate the possibility that a photographer does not intend to take a picture. It will be possible.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an outline of a camera having a telescope function according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the camera of FIG.

[Explanation of symbols]

1 ... Shooting lens 2 ... Main mirror 3 ... Condenser lens 4 ... Sub mirror 5 ... Erector lens 6 ... Field lens 7 ... Eyepiece lens 8 ... Distance measuring mirror 9 ... Focus detection line sensor 10 ... Microcomputer 11 ... Focus detection line sensor Drive circuit 12 ... Half mirror for photometry 13 ... Photometric sensor 14 ... Lens shutter 15 ... Normal shooting mode detection switch 16 ... Telescope mode detection switch

Claims (1)

[Claims] 1. A photographic optical system and a finder optical system for displaying a photographic range of the photographic optical system, wherein the finder optical system includes a first finder optical system for displaying the photographic range of the photographic optical system. In a camera configured to be at least selectable as a second optical magnification for displaying a range unrelated to the optical magnification and the photographing range of the photographing optical system, the second optical magnification is the optical magnification of the finder optical system. The detection means for detecting whether or not it is selected, and when the detection means detects that the main switch of the camera body is off when the selection of the second optical magnification is detected, the optical magnification of the viewfinder optical system is set to the first optical magnification. A camera having switching means for switching to an optical magnification.