JPS6232775B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a warning display device for exposure correction in a camera.

Auto-exposure cameras are generally equipped with an exposure compensation mechanism that artificially corrects the photometric value of an exposure meter built into the camera and allows correction to be made to the photographer's preference or when backlighting occurs.

The above correction is usually done by operating a correction operation member installed on the outside of the camera to determine the amount of correction, and then shooting with the corrected exposure amount. When transitioning to photographing, it is necessary to return the correction operating member of the correction mechanism to return to the photographing position based on the photometric value of the exposure meter.

However, in order to avoid the risk of continuing shooting based on the correction value if the correction operation member is forgotten to be returned, there is not only an external display indicating the movement of the correction operation member, but also a display in the viewfinder indicating whether or not correction is in progress. A warning message is displayed to let you know that you have forgotten to return the camera prior to photographing, and to prevent failure.

However, the warning display in the conventional finder is
Since the display member is brought into the field of view of the viewfinder by mechanical means to notify that the correction is in progress, a hole is provided in a part of the viewfinder through which the display member enters and exits. Not only is it unavoidable that dust enters the viewfinder through the hole, causing dirt inside the viewfinder, which is the worst thing to do in a single-lens reflex camera, but also the display member and the correction operation member are Because the camera must be mechanically connected, the degree of freedom in designing the inside of the camera is greatly restricted, and the structure of the mechanical connection mechanism is extremely complex, making it difficult to integrate into a narrow space, among other problems. It was hot.

In view of this, the present invention replaces the correction signal during exposure correction with an electric signal, guides the signal to a display element in the viewfinder, and clearly displays in the viewfinder that correction is being performed by this display element, At the same time as preventing mistakes during shooting, we completely abolished conventional mechanical coupling means, greatly increasing the degree of freedom in designing the camera's interior, significantly reducing the number of component parts, and simplifying the structure. The object of this invention is to provide a warning display device for exposure correction in a camera that does not cause dirt in the viewfinder.

The present invention will be described below with reference to embodiments shown in the drawings.

The figure is a cross-sectional view of the main parts of the warning signal generating portion of the warning display device according to the present invention, and this embodiment shows a case in which each part is arranged coaxially with the film rewind shaft 1 of the camera.

That is, an external display member 3 for displaying film sensitivity and exposure compensation is rotatably provided on a bearing portion 2 that supports the film rewind shaft 1, and a clutch member 4 and a click member are provided on the lower surface of the external display member 3. 5 are integrally provided.

a film sensitivity indicator member 6 provided so as to be able to rotate and slide upward coaxially with the external display member 3;
is integrally provided with a clutch member 7, and a leaf spring 8 is interposed between the clutch member 7 and the clutch member 4 of the external display member 3, and normally, as shown in the figure, the external display member 3 and an index member 6 are integrally coupled.

Inside the upper cover 9, a support member 10 for introducing film sensitivity and a support member 11 for exposure correction are provided rotatably supported by the bearing portion 2, and a support member 10 for introducing film sensitivity and a support member 11 for exposure correction are provided on the lower surface of the support member 10 for introducing film sensitivity. An introduction contact piece 12 and an exposure correction contact piece 13 are supported on the lower surface of the exposure correction support member 11, respectively.

The support member 10 for introducing film sensitivity has a pin 1.
4, and the exposure correction support member 11 is connected to the film sensitivity indicator member 6 via the projection 15.
is connected to the external display member 3 by engagement with the click member 5.

Each of the contact pieces 12 and 13 is in contact with a wiring pattern corresponding to each of a wiring board 16 made of printed wiring or the like fixed to the camera body side, and when the index member 6 is rotated during exposure compensation, An exposure compensation display element 18 consisting of a light emitting diode, liquid crystal, etc., provided within the viewfinder field of view 17, has a wiring pattern in contact with which the contact piece 13 of the exposure compensation support member 11 connected to transmits an exposure compensation signal is provided.
The lead wire 19 is connected to the lead wire 19.

Next, the operation of the above embodiment will be explained.

To introduce the film sensitivity, lift the film sensitivity indicator member 6 in the direction of the arrow to separate the clutch members 4 and 7, leave the external display member 3 as it is, and rotate it. When the member 10 is rotated, only the contact piece 12 is moved and placed on a predetermined wiring pattern on the wiring board 16, and the film sensitivity is set.

Next, to correct the exposure when shooting,
If the film sensitivity indicator member 6 is rotated with the clutch members 4 and 7 still connected without lifting it, the set value of the film sensitivity will change.
At the same time as the exposure is corrected, the external display member 3
As the exposure compensation support member 11 is rotated via the protrusion 15 as the exposure compensation support member 11 rotates, the contact piece 13 closes the circuit that emits the exposure compensation signal on the wiring board 16.
The electric signal generated by this is
Exposure correction display is performed in the viewfinder by activating the display element 18, such as a light emitting diode or liquid crystal, in the viewfinder.

When the film sensitivity indicator member 6 is returned to its original position, the contact piece 13 of the exposure compensation operating member 11 is also returned to its initial set position, and the display element 1 within the viewfinder field of view 17 is returned to its original position.
8 disappears.

As described above, the present invention utilizes the film sensitivity external display member and the sensitivity indicator member that have been conventionally used, and selects the wiring pattern on the wiring board by rotating the above-mentioned members during exposure correction to output the exposure correction signal. Since the signal is transmitted as an electrical signal and guided to the display element in the viewfinder to display a warning that exposure compensation is in progress, the number of components used in the warning device is extremely small. Since it is only necessary to connect to the viewfinder with a lead wire, it is easy to incorporate it into a small space inside the camera, and therefore the degree of freedom in designing the inside of the camera can be significantly increased. Further, since there is no need for any means for moving the display member in and out of the window, there are various excellent effects such as no dust entering the interior of the window and the interior of the window being prevented from becoming dirty.

[Brief explanation of the drawing]

The figure is a longitudinal cross-sectional view of essential parts showing an embodiment of a warning device for exposure correction according to the present invention. DESCRIPTION OF SYMBOLS 1... Rewinding shaft, 2... Bearing part, 3... External display member, 4, 7... Clutch member, 5... Click member, 8... Leaf spring, 9... Upper cover, 10
...Film sensitivity introduction support member, 11...Exposure correction support member, 12...Film sensitivity introduction contact piece, 13...Exposure correction contact piece, 14...Pin, 15...Protrusion, 16... ...Wiring base, 17...
Viewfinder field of view, 18... Exposure compensation display device.

Claims (1)

[Claims] 1. An external display member that externally displays film sensitivity and exposure correction, an indicator member that serves as an index of film sensitivity, a clutch member that connects these members in a detachable manner, and a connecting member that connects the film sensitivity indicator member to the film sensitivity indicator member. an actuating member connected to the external display member and having a contact portion for introducing film sensitivity; an actuating member connected to the external display member via a connecting member and having an exposure compensation contact portion; and a film sensitivity setting device in which each of the contact portions is contacted, respectively. and a wiring board provided with a wiring pattern for transmitting an exposure compensation signal and a wiring pattern for transmitting an exposure compensation signal, and when the exposure compensation contact portion contacts the wiring pattern for transmitting an exposure compensation signal during exposure compensation, the signal is transmitted to a display element in the viewfinder. A warning display device for exposure compensation in a camera, which guides the camera to display exposure compensation.