JP3217684B2 - Camera rotary information setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information setting device in a portable device such as a camera, and more particularly, to an information input unit by a dial operation.

[0002]

2. Description of the Related Art Conventionally, in a camera or the like, information setting is performed by dial operation to set an aperture and a shutter speed. For example, as shown in FIG. 8, a pulse is generated by a brush (movable contact piece) 12 sliding on a multi-divided circuit pattern 11 by a rotation operation, and the number of pulses is counted. The setting information has been changed.

In such an electronic dial, chattering occurs when the brush 12 is located at a change point 11a of a break in a multi-divided pattern, which causes a malfunction. To avoid this erroneous operation, a click is provided on the dial, the peak of the click is set as a change point of the pattern, and the brush does not stop at the change point.

[0004]

However, in the prior art, one click corresponds to one pulse or one count, and if a dial operation does not provide an analog operation feeling which is not affected by the pattern change point. There was a drawback to say.

[0005] When the normal operation section is not operated for a predetermined time, the camera shifts to a power OFF (power saving mode), and when the operation is started, the power is automatically turned on (a normal operation mode).
Many are designed to save energy. For this reason, even if the dial operation unit is not provided with the conventional SW pattern and click mechanism, when the dial is not operated, S
It is necessary to have a structure that does not stop or hardly stops at the changing point of the W pattern. This is because when the brush stops at the break of the SW pattern, a SW signal is output due to vibration or the like, which causes unnecessary power ON.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem and to simulate a voltage applied to a resistor by sliding a brush on the circumference of a continuous resistor. It was configured to be obtained as a sine wave voltage. That is, in a data setting device that is rotatable in both directions and increases or decreases setting data according to the rotation direction, the data setting device has at least one voltage supply point, and each voltage supply point
A first resistor capable of supplying a second voltage, a second circular resistor capable of supplying a second voltage to each voltage supply point, and interlocking the first and second resistors A rotary information setting device for a camera, comprising: a brush that slides; and a rotating member that rotates the brush, and configured to obtain a voltage signal.

Further, in a data setting device which is rotatable in both directions and increases / decreases set data depending on the rotation direction, the data setting device has at least one voltage supply point, and a first voltage can be supplied to each voltage supply point. A first resistor, a second circular resistor capable of supplying a second voltage to each voltage supply point, and a first and a second slider sliding interlockingly on the first and the second resistors. A rotary member for rotating the brush, wherein a voltage signal having a phase difference of 90 ° is obtained from the first and second brushes. Provide a setting device.

In a data setting device which is rotatable in both directions and increases / decreases set data according to the rotation direction, the data setting device has at least one voltage supply point, and a first voltage can be supplied to each voltage supply point. A first resistor, a second circular resistor capable of supplying a second voltage to each voltage supply point, and a first and a second slider sliding interlockingly on the first and the second resistors. And a rotating member for rotating the brush, wherein a voltage supply point in contact with the first circular resistor is disposed between the voltage supply points of the second circular resistor. 1
Wherein the second brush is disposed so as not to be at the voltage supply point of the first and second resistance members when the first brush is at the voltage supply point of the first or second circular resistor. A rotary information setting device is provided.

Further, the output voltages from the first and second brushes are input to a waveform shaping circuit having a threshold value with hysteresis, and the output from the waveform shaping circuit is processed.

Further, the output voltage from the first and second brushes is inputted to an A / D converter, and the output of the A / D converter is processed.

According to the above configuration, when the brush is rotationally slid over the circumference of the resistor, a pseudo SIN wave (SIN wave) voltage having the first (or second) comb tooth period is obtained from the brush. Can be By inputting the SIN wave voltage to a waveform shaping circuit having a hysteresis as a threshold, a rectangular wave (pulse) synchronized with the cycle of the SIN wave is obtained as an output of the waveform shaping circuit. Because the brush is always above the resistor,
As in the conventional case, there is no change point, and the possibility of malfunction due to chattering is extremely low.

A / D conversion of the sine wave voltage itself obtained as an output of the present invention makes it possible to divide one cycle (one pulse) into many parts, thereby providing a sense of analog operation expected for dial operation. Is improved.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an embodiment of the present invention, and FIG. 2 is a diagram for explaining the relationship between the configuration of FIG. 1 and output signals. In the figure, a first resistor 3 is provided on a first comb-shaped conductive pattern 1 connected to a reference voltage (VDD) which is a first voltage, and has a diameter equal to the cycle of the first comb teeth. And the second comb-shaped pattern 2 connected to GND which is the second voltage
Is provided. The phases (periods) of the first comb teeth and the second comb teeth are shifted by 180 °, and the first brush 5 is arranged on the circumference of each of the first and second resistors.
And the second brush 6 is slidably provided.

By the dial operation, the first brush 5 and the second brush 6 move in conjunction with each other, and a signal 1 is obtained from the first brush 5 having a 90 ° phase difference, and a signal 2 is obtained from the second brush 6. Is obtained.

FIG. 3 shows that the signals 1 and 2 obtained from the first brush 5 and the second brush 6 are connected to waveform shaping circuits 7 and 8 (Schmitt circuits) having a hysteresis in a threshold value. FIG.

FIG. 4 shows the first brush 5 and the second
A / D converter 9 A / D converts signals 1 and 2 obtained from the brush 6 of FIG. And improve the feeling of analog operation.

Here, multi-division processing by A / D conversion will be described with reference to FIGS. FIG.
The result of the A / D conversion is 1D1, 1D2, 1D3... 1Dn, 1Dn + 1 for each sampling on the time axis. Similarly, although not shown, the result of the A / D conversion of the signal 2 is represented by 2D1, 2D2, 2D for each sampling on the time axis.
3... 2Dn, 2Dn + 1. Where 1Dn and 2
Dn is used to obtain the result of A / D conversion of the signal 1 and the signal 2 at substantially the same time. In the A / D value, ΔW is one count. That is, one cycle of the SIN wave is divided by ΔW (FIG. 6).

Next, in FIG. 6, in the vicinity of the voltage supply point of the sliding resistor (both ends of the supply of VDD and GND), the linearity of the output voltage with respect to the movement amount of the brush deteriorates. In the signals 1 and 2, the allowable voltage of the linearity closer to GND is A, and the allowable voltage of the linearity closer to VDD is B. That is, the voltage range in which the linearity can be allowed is A to B.

The range in which the linearity of the resistor is ensured is designed so as to satisfy the following equation.

(VDD-B) + (A-GND) <(BA) Here, in the A / D sampling of the signals 1 and 2, when the signal 1 detects a voltage higher than the B or lower than the voltage A, the signal 2
Check whether the voltage at the terminal increases or decreases. When the signal 2 detects the voltage B or more or the voltage A or less, it checks whether the voltage of the signal 1 increases or decreases. Next, for example, signal 1
Is greater than or equal to the B voltage, the change in signal 2 is expressed as: ΔEn = 2Dn + 1
−2Dn, and add ΔE for each sampling. When the result (ΔE) becomes + ΔW, the count data is incremented by one, and when it becomes −ΔW, the count data is decremented by one.

Next, the operation procedure will be described with reference to the flowchart of FIG. The A / D input result of signal 1 is 1Dn, and the A / D input result of signal 2 is 2Dn (S101).
It is determined whether or not n is in the range of AB (S10).
2). If it is in the range of A to B, it is determined whether the A / D result of 2Dn is equal to or more than VDD / 2 (S103), and VDD /
If it is 2 or more, the level flag = H2 is set (S10).
4) If it is less than VDD / 2, the level flag is set to L2 (S115).

If 1Dn is not in the range of AB, S1
The processing after 20 is performed. When the level flag is different from the level flag of the previous signal input (S105, S12
2), S △ E is cleared to 0 (S116), and the process ends. When the level flag is the same as the level flag of the previous signal input (S105, S122), the following processing is performed.

At S106, ΔE = (1Dn)-(1Dn-
1) In S107, processing of S △ E = △ E + S is performed. Here, if S △ E ≧ △ W (S108), it is determined whether the level flag is H2 or L2 (S109). If H2, the sign of S △ E is determined (S110). In the case of (1), +1 count (S111), and in the case of-, -1 count (S118). Next, in the case of L2, the sign of S △ E is determined (S117), and in the case of +, −1 is counted (S1).
18) In the case of-, +1 is counted (S111). S
ΔE = 0 (S112), and the process ends.

When 1Dn is not in the range of AB, 1D
It is determined whether n is below A or above B (S1).
20) If the value is equal to or higher than B, the level flag is set to H1 (S121). If the value is equal to or lower than A, the level flag is set to L.
1 is set (S130). If the level flag is different from the level flag of the previous signal input (S122), S △
E is cleared to 0 (S116), and the process ends.

If the level flag is the same as the previous signal input level flag, the following processing is performed. Here, S122
Subsequent processing is the same as the description of the processing after S105, and thus will be briefly described. At S123, ΔE = (2Dn)
-(2Dn-1), the processing of S △ E = △ E + S is performed in S124. Here, if S △ E ≧ △ W, (S12
5), it is determined whether the level flag is H1 or L1 (S12)
6) In the case of H1, the sign of S △ E is determined (S12).
7) In the case of +, -1 count is performed (S128), and in the case of-, +1 count is performed (S132). S △ E for L1
Is determined (S131), if it is +, +1 is counted (S132), and if it is-, -1 is counted (S12).
8).

[0026]

As described above, according to the present invention, a rectangular wave (pulse) synchronized with the period of the SIN wave is obtained by passing the SIN wave obtained from the brush through a waveform shaping circuit having a hysteresis with a threshold value. Is obtained, and since the brush is always on the resistor, there is no change point different from the conventional one. Even if the brush slightly moves due to vibration or the like, the possibility of malfunction due to chattering is extremely reduced.

Further, it is possible to provide a power ON / OFF function even in a dial operation unit that does not require a click feeling and that favors a smooth operation feeling.

Further, by performing A / D conversion of the SIN wave itself, it is possible to divide one cycle (one pulse) into many parts, thereby improving the sense of analog operation expected for dial operation.

[Brief description of the drawings]

FIG. 1 is a configuration layout diagram of an embodiment of the present invention.

FIG. 2 is a diagram for explaining an output waveform in brush sliding.

FIG. 3 is a circuit diagram for explaining signal processing according to a second embodiment of the present invention;

FIG. 4 is a circuit diagram for explaining signal processing according to a third embodiment of the present invention.

FIG. 5 is a diagram for explaining multi-segment processing according to a third embodiment of the present invention;

FIG. 6 is a diagram for explaining a signal processing method according to a third embodiment of the present invention;

FIG. 7 is a flowchart illustrating a signal processing procedure according to an embodiment of the present invention.

FIG. 8 is a view for explaining a schematic configuration and chattering in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st comb-shaped conductive pattern 2 2nd comb-shaped conductive pattern 3 1st resistor 4 2nd resistor 5 1st brush 6 2nd brush 7, 8 Waveform shaping circuit 7A / D converter 10 CPU

Claims (5)

(57) [Claims] 1. A data setting device which is rotatable in both directions and increases / decreases set data in accordance with a rotation direction, has at least one voltage supply point, and is capable of supplying a first voltage to each voltage supply point. A first resistor, a second circular resistor capable of supplying a second voltage to each voltage supply point,
A brush slidably linked on the first and second resistors,
A rotary information setting device for a camera, comprising: a rotating member for rotating the brush; and configured to obtain a voltage signal. 2. A data setting device which is rotatable in both directions and increases / decreases setting data in accordance with the rotation direction, wherein the data setting device has at least one voltage supply point, and a first voltage can be supplied to each voltage supply point. A first resistor, a second circular resistor capable of supplying a second voltage to each voltage supply point,
First and second slidingly interlockingly moving on the first and second resistors
And a rotating member for rotating the brush, wherein a voltage signal having a phase difference of 90 ° is obtained from the first and second brushes. apparatus. 3. A data setting device which is rotatable in both directions and increases / decreases set data according to a rotation direction, wherein the data setting device has at least one voltage supply point, and a first voltage can be supplied to each voltage supply point. A first resistor, a second circular resistor capable of supplying a second voltage to each voltage supply point,
First and second slidingly interlockingly moving on the first and second resistors
And a rotating member for rotating the brush, wherein the voltage supply point in contact with the first circular resistor is disposed between the voltage supply points of the second circular resistor, Wherein the second brush is disposed so as not to be at the voltage supply point of the first and second resistance members when the first brush is at the voltage supply point of the first or second circular resistor. Rotary information setting device. 4. An output voltage from the first and second brushes is input to a waveform shaping circuit having a hysteresis in a threshold value, and an output from the waveform shaping circuit is processed. Item 4. A rotary information setting device for a camera according to items 2 and 3. 5. An apparatus according to claim 2, wherein output voltages from the first and second brushes are input to an A / D converter, and an output of the A / D converter is processed. Camera rotation information setting device.