JPH10186477A - Motor rotating and driving device and shutter charge controller for camera using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of the pins of a charge booster, to simplify the control circuit and to easily attain interchargeability between new and old cameras, by deciding the rotating direction of a motor in accordance with the on/off of either of plural input terminals when the other input terminal is turned on. SOLUTION: The control circuit is provided with two input terminals A and B. In the case of (A, B)=(0, X), the motor is open, in the case of (A, B)=(1, 0), the motor is normally rotated, in the case of (A, B)=(1, 1), the motor is reversely rotated, and in the case of (A, B)=(FE, X), the motor is braked for a prescribed time (mark FE means falling). Namely, the terminal B designates a direction at the time of rotation, and the terminal A brakes the motor for the prescribed time when the motor is open, when it is rotated and when it is shifted from a rotating state to an open state. Thus, high speed charge is realized by turning on the terminal B when power source voltage is high in the new camera and the new charge booster.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor rotation drive device for controlling forward and reverse rotation of a motor based on signals input to two input terminals, and a camera shutter charge control device using the motor rotation drive device. About.

[0002]

2. Description of the Related Art Conventionally, a control method of a DC motor driver is a method shown in FIG. The motor control circuit has two inputs of A and B and two outputs of Y and Z. The truth table of the motor control circuit opens four states obtained from the two inputs of A and B as shown in Table 3. , Forward rotation,
It was converted into the state of four motors, reverse rotation and brake, and was driven.

For example, when (A, B) = (0, 0), in order to open the motor, (Y, Z) = (open, open), and when (A, B) = (1, 0), (Y, Z) = (H, L)
With (A, B) = (0, 1), (Y, Z) = (L, H)
In (A, B) = (1, 1), (Y, Z) = (L, L)
The brakes were running at.

[0004] This method is very common, and the commonality remains the same even if the combination is slightly different in that two-bit inputs are statically assigned to the four states of the motor as they are. In order to create these four states, the final stage of the motor driver, which will be described below, is constituted by the circuit shown in FIG. 5, and the relationship between the state of the transistor and the state of the motor as shown in Table 5 of the separate sheet. ing.

In FIG. 5, Q1 and Q2 are PNP transistors, Q3 and Q4 are NPN transistors,
The collectors of 1 and Q3 are commonly connected to the Y terminal, and the collectors of Q2 and Q4 are commonly connected to the Z terminal. When the motor is open, Q1 to Q4 are off. When the motor is rotated forward, only Q1 and Q4 are on. When the motor is reversely rotated, only Q2 and Q3 are on. When the motor is braked, Q3 and Q4 are turned on. Was only on.

On the other hand, a method of controlling a motor with one terminal is as follows.
The method shown in FIG. 4 and the attached table 4 is generally used. The motor control circuit has one A input and one Y output, and the truth table thereof is as shown in Table 4 (a) or 4 (b). That is, open ← → rotation or brake ← → rotation. This is because 1-bit information of only A input is statically decoded and the output state is selected. Therefore, if rotation is assigned as one state, one of the remaining states has to select either open or brake. It is not possible.

However, in the open state, even if the state shifts from the rotation state to the open state, the rotation operation cannot be stopped immediately due to the inertia (inertia) of the motor or the like, resulting in overrun. This is a problem when controlling rotation. On the other hand, in the case of brakes,
A transistor base current or the like is required, and continuing that state is a waste of energy. FIG. 6 shows a circuit of the driver section. This is a so-called half bridge circuit, and three states of the motor can be obtained by turning on and off the transistors Q5 and Q6 as shown in Table 6 of the attached sheet. When both Q5 and Q6 are turned on, only such a through current flows, so there is no such decoding.

[0008]

However, FIG.
The decoding methods shown in FIG. 4, Table 3, and Table 4 were difficult to use from the viewpoint of compatibility. This point will be described later with reference to FIG. Also, as mentioned above,
Since the one-terminal control method shown in FIG. 4 can use only one of the brake and the open, the actual product design is faced with problems relating to controllability and current consumption. Hereinafter, specific difficulties in product design will be described with reference to FIG.

FIG. 7 shows four modules (CHG1 and CHG1).
G2, CAM1, and CAM2). CAM2 and CHG2 are an old camera 2 and an old charge booster 2, respectively. In order to perform high-speed continuous shooting, the camera can be charged at high speed by a charge booster or the like as an external accessory. It is possible. That is, the charge booster 2 (C
The control circuit in HG2) rotates or stops the motor M. In order to maintain the operation over a wide range of the power supply voltage VCC, this old type set copes with insufficient torque at a low voltage by lowering the gear to a relatively low speed rotation.

This charge booster 2 is not the circuit of FIG. 4 described above from the viewpoint of motor rotation controllability and energy saving,
The circuit of FIG. 2 is mounted. Although the specific operation of the circuit of FIG. 2 will be described later, basically, the open and the rotation of the motor are selected in the state of the terminal A, but in order to increase the stopping accuracy of the motor during the transition from the motor rotation to the open state. , Brake is applied for a predetermined time. For this purpose, a one-shot timer is used in FIG.

The above-mentioned set of the old camera 2 and the charge booster 2 requires the camera 1 and the charge booster 1 for the purpose of further high-speed continuous shooting. Here, the power supply VCC is connected inside the camera 1 with the resistors R1 and R2.
The midpoint obtained by dividing the voltage into the A / D conversion port of the microcomputer CPU1 is input to the A / D conversion port of the microcomputer CPU1. When the power supply VCC is high and the supply energy is sufficient, the rotation torque of the motor is large. And then camera 1
To charge the shutter charge unit at a higher speed. Therefore, in the charge booster 1, the planetary mechanism operates at the time of reverse rotation by using the reverse rotation of the motor, and a higher speed gear is selected than at the time of forward rotation.

By using two terminals A and B,
There are no problems of controllability and energy consumption because four states of open, forward rotation, reverse rotation and brake can be selected. Therefore, it is conceivable to employ the most general method of FIG. 3 for the charge booster 1, but in this case, CHG1 and CAM2 and C
There is a compatibility problem between the old and new such as HG2 and CAM1. That is, the charge booster 1 (CHG1) employs the static decode type system shown in FIG. 3, while the charge booster 2 (CHG2) employs the static decode system for controllability and energy saving. This is a dynamic decoding type system shown in FIG. Therefore, in order to make these coexist, I can distinguish between new and old.
The D terminal is required, which causes a problem that both the number of pins and the control circuit are complicated.

Accordingly, an object of the present invention is to provide a motor rotation drive device in which the number of pins of the charge booster and the control circuit are both simple and the compatibility between old and new can be easily achieved.

Another object of the present invention is to provide a camera shutter charge control device using a motor rotation drive device.

[0015]

In order to achieve the above object, according to the present invention, the circuit configuration shown in FIG. 1 is used as a command for interfaces A and B between the camera 1 (CAM1) and the charge booster (CHG1) shown in FIG. By adopting the four states shown in Table 1 of the separate sheet, it becomes extremely easy to eliminate the need for the identification pin, and at the same time, the problems of motor stop controllability and energy consumption are eliminated.

[0016]

【Example】

(Embodiment 1) FIG. 1 shows a circuit in which all of the above problems are solved, and Table 1 is a truth table thereof. FIG. 2 is also considered a subset of FIG. In FIG. 1, the control circuit has two inputs A and B. When (A, B) = (0, X), the motor is open. When (A, B) = (1, 0), the motor is forward. When (A, B) = (1, 1), the motor is open. When reverse rotation (A, B) = (FE, X) (note that FE indicates a fall), the motor is braked for a predetermined time.

That is, the terminal B is provided for designating the direction at the time of rotation, and the terminal A is used to secure the stop controllability of the motor when opening, rotating, and when shifting from rotation to open. Is provided to instruct the user to apply a brake for a predetermined time. The brake is applied to the motor by triggering the clock terminal CK of the one-shot timer at the FE (falling edge) of the terminal A until the Q output returns after a predetermined time. By adopting such a circuit configuration, CAM1
When the power supply VCC is high in CHG1 and CHG1, high-speed charging can be realized by turning on the B terminal.

Also, from the viewpoint of compatibility, CAM1 and CHG
In the case of 1, the low-speed charge inherent in CHG2 can be realized irrespective of the state of the B terminal, while the software of CAM1 remains unchanged. Further, in CAM2 and CHG1, CAM2 does not have a B terminal, so that the B terminal of CHG1 is turned off, and CHG1 always realizes low-speed charging. No problem.

[0019]

As described above, according to the present invention,
Excellent compatibility with both excellent motor stop controllability and energy saving, while maintaining full mutual compatibility between the old charge booster system that performs one-terminal control and the new charge booster system that performs two-terminal control for even faster charging. System can be realized. In the table (truth table) shown for the purpose of describing the invention, the logic of 1 and 0, the logic of H and L, and the state of the selected motor as a result of the combination thereof are inverted or rearranged in order. Can be easily realized, and the present invention is not limited to the attached truth table.

[Table 1]

[Table 2]

[Table 3]

[Table 4]

[Table 5]

[Table 6]

[Brief description of the drawings]

FIG. 1 is a circuit block diagram for two-terminal control according to the present invention.

FIG. 2 is a circuit block diagram for one-terminal control according to the present invention.

FIG. 3 is a circuit block diagram for a conventional two-terminal control.

FIG. 4 is a circuit block diagram for controlling one terminal of a conventional example.

FIG. 5 is a circuit diagram of a motor drive unit (H bridge).

FIG. 6 is a motor drive section (half bridge);
FIG.

FIG. 7 is a circuit block diagram showing an application example of the present invention.

[Explanation of symbols]

 CAM1 New camera CAM2 Old camera CHG1 New charge booster CHG2 Old charge booster

Claims (2)

[Claims] An open means for opening a motor when a first input terminal is OFF, in a motor rotation drive device for controlling forward and reverse rotation of a motor based on signals input to two input terminals, The first input terminal is ON
In the case of, rotating means for rotating the motor in a specific direction,
When the first input terminal changes from ON to OFF after the rotation of the motor by the rotation means, a brake means for applying a brake to the motor for a predetermined time, and a second means for braking the motor when the first input terminal is ON. A rotation direction determining unit that determines the direction in which the motor is rotated in accordance with the ON or OFF state of the input terminal in the specific direction or in the opposite direction. 2. A shutter charge control device for a camera using the motor rotation drive device according to claim 1, wherein the motor rotation drive device is turned on at the first input terminal and the second input terminal of the motor rotation drive device. Or a first type of camera having output means for outputting a combination of OFF signals from two output terminals, and a shutter charge unit to which rotation of the motor is transmitted, or the first input of a motor rotation drive device A second type of camera having an output means for outputting an ON or OFF signal to one terminal from one output terminal, and a second type of camera having a shutter charge unit to which the rotation of the motor is transmitted. Shutter of a camera of the second type or a camera of the second type. Page control device.