JP2000122114A - Shutter speed setting device for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily set long second shutter speed in a short time by providing a switch for changing over ordinary setting and long second setting. SOLUTION: The figures of a multiple series which starts from 1, a letter B showing a bulb and a letter A showing aperture-priority automatic exposure are arrayed and inscribed in a dial periphery direction on the panel surface of a shutter dial 11. The dial 11 is equipped with a click stop mechanism which stops at a position where the figure on the panel surface coincides with an index 12 on a camera body side, and the shutter speed is set by setting the figure on the dial 11 to a position indicated by the index 12. By operating an operation lever 13, a mode (ordinary mode) in which the inverse of the figure displayed on the dial 11 is set to the shutter speed and a mode (long second mode) in which the displayed figure is set to the shutter speed as it is are switched.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera shutter speed setting device.

[0002]

2. Description of the Related Art A conventional shutter dial for setting a shutter speed of a camera uses a reciprocal number of the shutter speed, for example, 1, 2, 4, 8,.
The numbers are written on the dial board such that they are arranged in the circumferential direction of the dial in a so-called multiple series such as 0 and 2000. When a desired shutter speed is set, the shutter dial is rotated in the circumferential direction so that a number corresponding to the shutter speed matches an index on the camera body. Here, in order to enable setting of a shutter speed of a long second exceeding 1 second, a numeral such as 2S, 4S, 8S,... In addition, it was arranged and arranged in the dial circumferential direction. Alternatively, as shown in FIG. 1, the shutter dial 11 is provided with a position LT for setting a long second, and a setting button / display means for setting / displaying the number of seconds of a long second (not shown) is separately provided. It had been. However, in the former, there is a limit in the notation of the shutter dial on the board surface, and therefore, the number of long seconds provided is limited. In the latter case, a troublesome operation must be performed in order to set the number of seconds of the long shutter speed, and there is a problem that the setting takes a long time.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a shutter speed setting device for a camera which can easily set a long shutter speed in a short time and easily. .

[0004]

SUMMARY OF THE INVENTION According to the present invention, a number indicating a shutter speed is arranged and displayed on the surface of a shutter dial that can be rotated.
A shutter speed setting device for a camera, wherein the shutter speed is set by matching the number with an index provided near the shutter dial; a normal setting in which the number of seconds that is the reciprocal of the number is used as the shutter speed; And a long-time setting in which the number of seconds is set to the shutter speed.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. 2 and 3 show a first embodiment of a shutter dial to which the present invention is applied. Although not shown, this shutter dial is provided near the release button on the upper surface of the camera body. The shutter dial 11 has, on its surface, multiple series numbers starting from 1 and B indicating a valve and A indicating an aperture priority automatic exposure arranged and written in the dial circumferential direction. The shutter dial 11 is provided with a click stop mechanism that stops at a position where the number on the board and the index 12 on the camera body coincide with each other. The shutter speed is set at the position indicated by the index 12 on the shutter dial 11. This is done by matching the numbers. In this embodiment, by operating the operation lever 13, a mode in which the reciprocal of the number displayed on the shutter dial 11 is set to the shutter speed (hereinafter, referred to as a shutter speed).
The mechanism switches between a normal mode) and a mode in which the displayed number is directly set as the shutter speed (hereinafter, a long-time mode). The operating lever 13 is at its end, as shown in FIG.
3 and a position shown in FIG. 3. When the operation lever 13 is at the position shown in FIG. 2, the normal mode is set, and when the operation lever 13 is at the position shown in FIG. That is, in FIGS. 2 and 3, the index 12 points to “15” which is a number on the shutter dial 11, but is 1/15 second in the normal mode in FIG. The shutter speed is set. In the long second mode shown in FIG. 3, the index 14 is provided so that the user can recognize at a glance that the mode is the long second mode. In the normal mode shown in FIG. 2, the indicator 14 is hidden by the operation lever 13 and is not visible. In FIG. 3, the index 14 is indicated by a black circle, but may be a character (for example, LT) or the like indicating the long-time mode so that the user can easily recognize the mode. Further, in the present embodiment, an index indicating the effect is provided only in the long-time mode, but a display (for example, NO
(RM / LT).

FIGS. 4 and 5 show a shutter dial according to a second embodiment of the present invention. In this embodiment, only when the number on the surface of the shutter dial 15 is set to “1”, the shutter dial 15 is lifted, and the long-time mode and the normal mode are switched between the raised position and the depressed position, Mode switching is realized. That is, the shutter dial 15 shown in FIG.
Can be lifted and pushed down along the center axis only when the number "1" on the board and the index plate 12 match. It is provided rotatably. A switch 17 is provided so that the position where the shutter dial 15 is raised is switched to the long-time mode and the position where the shutter dial 15 is pressed is switched to the normal mode. In the present embodiment, the mode is switched to the long second mode by lifting the shutter dial 15 itself,
Since the mode can be determined at a glance, it is not necessary to display each mode by an index or the like.

In this embodiment, the shutter dial 1
The mode is switched only when the number on the board of No. 5 is set to “1”, but the present invention is not limited to this.
Although the mechanism is switched to the long-second mode by raising the shutter dial 15, the mechanism may be switched to the long-second mode by depressing the shutter dial 15. At that time, a mechanism for pushing the shutter dial 15 depressed to the original position may be provided. Further, the shutter dial 15 is moved to a predetermined position on the surface of the shutter dial board, for example,
The mode may be switched by being lifted in the range of ~ 250.

FIG. 6 is a block diagram showing a control circuit of a shutter dial mechanism according to a first embodiment of the present invention. The control circuit includes a CPU 16. The CPU 16 includes a switch 17 that is switched by operating the operation lever 13, a rotary encoder 18 that rotates together with or in conjunction with the shutter dial 11 and detects a stop position by bit data, and a switch 17. And rotary encoder 18
Is connected to a shutter control circuit 19 that determines the shutter speed based on the input.

The operation of the control section of the shutter dial mechanism of the first embodiment to which the present invention is applied will be described with reference to the flowchart shown in FIG. The following processing is executed by the CPU 16. This flow is a flow for determining whether the mode set by the user is the normal mode or the long-time mode, and setting the corresponding shutter speed. When entering this flow, first, the shutter dial 11
The bit data output from the rotary encoder 18 is read (S101), and the shutter dial 1 is read from the bit data.
A set value N of 1, that is, a number on the shutter dial indicated by the index plate 12 is obtained (S102). Next, the mode of the operation lever 13 is recognized based on the signal from the switch 17 (S103), and it is checked whether the mode of the operation lever 13 is the normal mode (A) or the long-time mode (B) (S104). ). If A (S104: A), the variable t is set to 1 / N (S105) because the normal mode is set. If B (S1
06), since the setting is the long second mode, the variable t is set to N (S106). Then, the variable t obtained in either S105 or S106 is set as the shutter speed (S107).

The block diagram of the control circuit of the shutter dial mechanism of the second embodiment to which the present invention is applied is substantially the same as that of the first embodiment, and therefore is not particularly shown.
FIG. 3 is a block diagram in which the switch 17 and the operation lever 13 are replaced with a switch 17 that switches at a position where the shutter dial 15 is protruded and retracted, and a shutter dial 15, respectively. Also, since the control flow of the control circuit is almost the same as that of the first embodiment, it is not particularly shown, but in FIG.
This is a flow in which the check of the operation lever 13 in S103 and S104 is replaced with the check of the protruding / retracted position of the shutter dial 15.

[0011]

As described above, according to the shutter dial to which the present invention is applied, the normal setting for setting the shutter speed to the reciprocal number of seconds of the number displayed on the surface of the shutter dial, and the seconds of the displayed number Since the means for switching between the long setting and the shutter speed as the number is provided, the shutter dial can be used for both the normal setting and the long setting. Shutter speed can be set quickly and easily.

[Brief description of the drawings]

FIG. 1 is a top view of a shutter dial of a conventional camera as viewed from directly above.

FIG. 2 is a top view of the shutter speed setting device in a normal mode according to the first embodiment of the present invention, as viewed from directly above.

FIG. 3 is a top view of the shutter speed setting device in the long-second mode according to the first embodiment of the present invention, as viewed from directly above.

FIG. 4 is a top view of a shutter speed setting device according to a second embodiment of the present invention as viewed from directly above.

FIG. 5 is a perspective view of a shutter speed setting device in a long second mode according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing a control circuit of the shutter speed setting device to which the present invention is applied.

FIG. 7 is a flowchart showing control of a shutter speed setting device to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Shutter dial 12 Index 13 Operation lever 14 Index 15 Shutter dial 16 CPU 17 Switch 18 Rotary encoder 19 Shutter speed calculation circuit 20 Shutter control circuit

Claims (6)

[Claims] 1. A camera shutter for setting a shutter speed by aligning numbers indicating a shutter speed on a board of a rotatable shutter dial and matching the number with an index provided near the shutter dial. A speed setting device, comprising: a switch for switching between a normal setting in which the number of seconds that is the reciprocal of the number is a shutter speed and a long setting in which the number of seconds is a shutter speed. 2. The camera shutter speed setting device according to claim 1, wherein the numbers arranged and displayed on the board are numbers in a multiple series starting from 1. 3. The camera shutter speed setting device according to claim 1, wherein the switch is provided separately from the shutter dial. 4. The shutter speed setting device for a camera according to claim 3, wherein said switch further comprises means for indicating whether a switching state of said switch is a normal setting or a long time setting. 5. The shutter speed setting device for a camera according to claim 1, wherein the setting of the switch is switched by a protruding / retracting operation of the shutter dial in a central axis direction. 6. The camera shutter speed setting device according to claim 5, wherein the shutter dial can be moved in and out only at a predetermined rotation position.