JPH0332049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for inputting photographic information such as film sensitivity and shutter speed to a camera control mechanism.

Conventionally, when setting and inputting the above-mentioned shooting information to a camera, a sliding resistor or 4-bit to 5-bit
Using a dial with a built-in circuit board patterned with bit code values, for example, for film sensitivity, the dial is engraved with discrete values such as ASA100, 125, 160, 200, 250, etc. Many of them were designed to fit in a specified position. However, such a setting device has the disadvantage that the dial component is complicated, and if the information display system is placed inside the viewfinder, it becomes extremely difficult to operate the dial while looking at the viewfinder. There is.

As a new shooting information setting device, the current setting value is displayed on the display system, and you can change the setting value by pressing the up button or down button depending on whether you want to increase or decrease the setting value. A system has also been proposed in which the displayed value changes sequentially as the button changes, so that all the user has to do is stop pressing the button at an appropriate point. Although this setting device is easy to configure with only two switches,
In reality, it has the disadvantage of poor operability. In other words, if the information display system is in the viewfinder, the photographer needs to press these setting button switches while looking at the viewfinder while pressing the metering start switch. It is difficult to press with two fingers. For cameras with a mechanism in which the metering start switch described above is turned on by pressing the first step of the release button and released by pressing the second step, press the first step metering start switch with your index finger, then press the metering start switch with your other finger. If you try to press the up or down button, you may end up pressing the second-stage shutter release, resulting in a design that is ergonomically problematic.

The present invention aims to provide a setting method that can provide a photographic information setting device with a simple configuration similar to the push-button setting device described above but with good operability.

A detailed explanation will be given below with reference to the drawings.

FIG. 1 is a top view of a single-lens reflex camera embodying the present invention, in which a two-stage switch 2 provided in the warship portion of the camera body 1 starts photometry when the first stage is pressed.
The second press performs the release operation.

The current set values of film sensitivity and shutter speed are displayed on display units 3a and 3b using, for example, four-digit, seven-segment liquid crystal display elements.

4a is the ASA setting dial, 4b is the shutter speed setting dial, and these dials are UP.
If you turn it toward the side, the set value will increase, and if you turn it toward the DOWN side, the set value will decrease. In the information setting device having such a structure, when the first step of the switch 2 is pressed with the index finger of the right hand of both hands holding the camera,
All you have to do is turn the dial left and right with the pad of your thumb, resulting in an excellent ergonomic configuration.

The dials 4a and 4b are examples of signal generating dials used in such an information setting device, and as shown in FIG. 6b,6
a, and a short circuit part 6d connecting these rings.
It has a conductor pattern 6 made up of. Metal pieces 7a, 7b, 7c are in contact with each ring 6a, 6b, 6c of this conductor pattern, respectively, and the metal pieces 7a, 7b are connected to the control circuit, and the metal pieces 7c
is connected to the ground circuit. Therefore, the entire conductor pattern is always grounded by the metal piece 7c. Therefore, when the metal pieces 7a and 7b are in contact with these conductor patterns, they send a ground signal to the control circuit, and when they are on a defective part of the conductor pattern, that is, on an insulator, they send an open signal to the control circuit. That is, this dial is simulatively equivalent to the switch circuit shown in FIG.

Now, the metal pieces 7a, 7 are placed at the position of arrow A in FIG.
If b and 7c are in contact, metal piece 7
a and 7b send ground signals to the control circuit. When the dial is rotated in the direction of arrow B, the metal contact piece 7a is first rotated as shown in the timing chart in FIG.
gives an open signal, and later the metal piece 7b gives an open signal. If the rotation direction is opposite to the arrow B, the metal piece 7b will first issue an open signal, and then the metal piece 7a will issue an open signal. Therefore, in this embodiment, the dial is determined by phase discrimination of the open signals from the metal pieces 7a and 7b based on the position where all the metal pieces set at every 60 degrees are ground signals. It is possible to distinguish the direction of rotation, that is, an instruction to increase or decrease the information setting value of the camera, and the setting value can be changed accordingly.

According to the method of this invention, the camera user can keep looking at the viewfinder and do not have to worry about the rotation angle of the dial, but simply rotates the dial to the right or left, and the camera settings and settings are displayed accordingly. is changed, so there is no fear of erroneous operation and it is extremely easy to use.

In the above embodiment, the signal extraction for rotational direction discrimination was performed using the conductor pattern and the metal piece, but for example, as shown in FIG.
It goes without saying that the apertures 9 may be provided at regular intervals on the same circumference and detected photoelectrically, or may be turned on and off magnetically or mechanically.

[Brief explanation of the drawing]

Fig. 1 is a top view of a single-lens reflex camera embodying the present invention, Fig. 2 is a plan view showing an example of the conductor pattern of the dial, Fig. 3 is a conceptual diagram showing the configuration of the switch, and Fig. 4 is the switch. Fig. 5 is a timing chart showing the output signal of the switch.
FIG. 6 is a plan view showing another embodiment of the dial. 1...Camera body, 2...Release switch,
3...Display section, 4...Dial, 5...Insulating substrate, 6...Conductor pattern, 7...Metal contact piece, 8...
... Opaque substrate, 9... Opening portion.

Claims (1)

[Claims] 1. A rotating member that can rotate in both directions and has a plurality of reference positions during one rotation, and a first member that generates a ground signal and an open signal between each reference position of the rotating member. a pattern that forms the same signal as the first pattern at a reference position of the rotating member, and between each reference position, a ground signal and an open signal for each signal formed by the first pattern. a second pattern formed with a phase difference; and a signal that first changes as the rotating member rotates from each reference position is an output signal from the first pattern or an output from the second pattern. If the first signal that changes is from the first pattern, a first rotation direction signal is used, and if the signal is from the second pattern, a second rotation direction signal is used. An information setting device comprising: a discrimination means for outputting a rotational direction signal; and a control means for increasing or decreasing photographic information based on the first or second rotational direction signal from the discrimination means.