DE2461665A1 - MOTOR DRIVE DEVICE FOR A PHOTOGRAPHIC CAMERA - Google Patents

Description

Motor drive device for a photographic camera

The invention relates to a motor drive device for a photographic camera.

For starting and parking a motorized gate in a motorized one The motor is normally switched on and off by means of a camera equipped with a camera in the motor drive provided relay switch. Because of the quick start and stop of the motor as well as low sparking on the switch contacts are aimed at, the relay switch is expediently controlled via a semiconductor that has only one small electric current needed. For this reason, a motor driving device has been practically used developed in which a transistor is used to control the winding ^ of the film or the film transport is, wherein a diode and a switch between the base and emitter of the transistor are connected in series with one another. When the release button is pressed in this device, the base and emitter are short-circuited via the diode, whereby the transistor for controlling the film transport is brought into the blocking state, so that the motor is stopped. When the finger is removed from the release button, the transistor for controlling the film transport is switched on, so that the motor starts and thereby the film to one

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Image field transported. After the film has been rewound by one frame, the motor is stopped again.

With such a motor drive, however, the current flows when the trigger button is pressed, continue over the diode, which leads to a rapid discharge of the battery. Also causes the current flowing in the opposite direction of the diode causes the transistor that controls the winding of the film to be switched through, so that the motor runs and thereby transports the film too far.

The invention is therefore based on the object to provide an improved motor drive device for a camera, which no longer adhere to the disadvantages mentioned.

This object is achieved in a motor drive device of the type mentioned according to the invention by a motor for Release of a shutter for the purpose of film exposure and for winding or transporting a film ^ through a first Switching device for controlling the motor for film transport and by a second switching device for controlling the Motor for the shutter release, wherein the first-mentioned switching device has a switching element and a switch, which cooperates with a camera release button to activate the switching element when the release button of the camera is pressed in the locked state and when the OffBasrknopf is not pressed to bring into the switching state. According to a special Embodiment of the invention is the switch for the film transport controlling transistor through a relay switch opened and closed, which is coupled with the trigger actuation, resulting in complete deactivation contributes to incorrect operation.

In the following, preferred embodiments of the invention are explained in more detail with reference to the accompanying drawings. Show it:

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Fig. 1 is a circuit diagram of a motor drive device Features of the invention and

2, 3 and 4 are circuit diagrams of modified embodiments of the invention.

The embodiment of the invention shown in Fig. 1 has a power source E, a positive or plus busbar 1, a negative or minus busbar 2 and a power supply or main switch SW9 provided in the busbar 1. Between the positive busbar 1 and the negative bus bar 2 are a diode D1 and a trigger switch SW1 connected in series with it and a diode D1 Rheostat or control resistor VR1 for determining a time constant, for example a slide resistor, a fixed-value resistor R1, which acts as a protective resistor Capacitor C1 for determining a time constant and a switch circuit SC1 switched on. Branches 3 and 4 are interconnected and connected to the input side of the switch circuit SC1, the output side of which has a Fixed-value resistor R4 is connected to the base of a pnp transistor TR1 for trigger actuation. The collector of the transistor TR1 is connected to the negative busbar 2 through a trigger switch SW5, and its emitter, which is connected to the collector via a switch SW3 for optional single and series image recording, is connected to a Contact A connected, which is connected to the movable member of a timer SW2. The other contact B is connected to the emitter of a pnp transistor TR2 to control the film winding process, in the following simply as film transport designated, connected. The switch SW5 cooperates with a camera release button so that when it is pressed the switch SW5 is closed. The collector of the transistor TR2 is connected to the negative busbar 2.

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closed, and its base is connected to the fixed-value resistor R5 and via a normally closed switch SW5 ^f for the transistor TR2 to the negative busbar 2, the switch SW5 ¹ for opening and closing with the trigger switch SW5 (mechanically) coupled is. The junction 5 between the switch SW5 and the busbar 2 is connected to the junction 6 between the resistor R5 and the film winding control transistor TR2 via a switch SW4 for either single or series image recording, this switch having a contact S2 for single image recording and one Has contact C2 for series image recording, which are coupled to the switch SW3.

The movable member of the timer switch SW2 is connected to a switch SW10, which in turn is connected to a non- is coupled aperture mechanism shown. Between the switch SW2 and the positive bus bar 1 are one Diode D3 and a parallel relay RL2 switched on. In the dropped state, the relay connects RL2 the input of the motor M, one input of which is connected to the positive busbar 1, by flipping a movable one Switch member with the contact a of a relay switch RL2-1. When the relay RL2 picks up, however, the motor M is with the Contact b connected.

In the state shown in Fig. 1, in which the main switch SW9 is open, a film has been transported by one frame, so that the film is ready for the next frame, with the movable members of the switches SW3 and SW4 at the contacts S1 or S2 for a single image close to ₉ so that the shutter can be released at any moment.

If the main fallopian tube SW9 is closed and the one is calibrated

if * if ". (TTi iO *" ■ & iF% S / Hi if * f * s!

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known and therefore not shown trigger button is pressed, the trigger switch SW5 coupled to the latter is closed. At the same time, the switch SW5 ¹ coupled therewith for the winding control transistor is opened, so that the relay RL2 picks up and the movable member of the relay switch RL2-1 flips over to the contact b, thereby causing the motor M to start.

The rotation of the motor M initiates the exposure through the known shutter, not shown, and at the same time the switch SW1O. by the known aperture mechanism not shown opened.

The relay RL2 eventually drops out, so that the movable member of the relay switch RL2-1 from contact b to the Contact a flips over and short-circuits the motor M in the process. As a result, the motor M is braked and brought to a standstill.

As mentioned, the movable member of the timer SV2 when the switch SW1O is opened by a not shown Lever moved from contact A to contact B. The exposure takes place while the movable member of the timer is moving SW2 is at contact A, while the film transport, as will be explained in more detail, then takes place, when this movable member is at contact B.

After the exposure, the switch SW10 is opened again. However, if the release button is still pressed, the switch SW5 ¹ for the winding control transistor is held in the open position. No base current flows to the transistor TR2, so that the latter remains in the blocking state, the relay RL2 has dropped out and the motor M is at a standstill «

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Then when the finger is removed from the shutter release button, the switch SW5 * opens for the winding control transistor TR2, so that it switches through and the relay RL2 the Motor M can start. After the film has been advanced one frame, the movable member settles of the time switch SW2 from contact B to contact A. Even if the movable member of the timer SW2 switches to contact A, the release switch SW5, which remains open, prevents the relay RL2 from being actuated, so that the motor M remains unactuated and the arrangement is ready for the next trip.

If serial images are then to be made, the switches SW3 and SW4 to select single or serial images are switched to contacts Ci or 2 for serial image acquisition. Here, collector and emitter are kurzgeecKLossen of the transistor TR1 for di @ triggering, eo that the transistor a © times works "Di © base of Aufspuleteuer-Tr BSistors TR2 other hand, is constantly ämn Sehalter SV4 via d @ n fixed-value resistor E5 with the minus Side of the power supply connected, so that you see the transistor in a ziastand ₉ Ia weleham the base current can flow independently of the switch S ¥ 5 ^B for the winding control Traneiabr ·

which at aicli received © SeMltkreis SC1 wilarend its control resistor VR1, which determines the time constant ©, and which activates the Z © itkoastant @ f @ stl @ gendea capacitor G1 bQStlsmtaa Zeitspaon © _{9 a} base current flows through the P © stw <gi * t «= I # Iderstand Rk ₉ so that the transistor TR1 for AwslSseAetätigiiag diarehselialtet _e

Then when the AiaslSapfeiopf wlrd _s © hll © 6t the trigger switch SW5 * and weim the Selialtfereis SC1 © one

Assumes the operating state, the transistor TR1 is switched through for actuation of the shutter release Relay RL2 activated, the motor M rotates in the aforementioned manner, and the exposure occurs as in the case a single image recording. After the exposure, the movable member or the contact arm of the timer lays down SW2 from contact A to contact B.

Different from the state when taking a single image is here that the base current for the winding control transistor TR2 via the fixed-value resistor R5 and the switch SW4 flows, so that the transistor TR2 is switched on and the relay RL2 remains in the attracted state. On that the film is transported, and the movable member or the contact arm of the timer SW2 lies down again from contact B to contact A.

When switching the contact arm of the timer SW2 to contact A is briefly closed by the trigger switch SW1 by a known trigger lever, not shown, so that the capacitor C1, which determines the time constant, can discharge.

This deactivates the circuit SC1, and the Transistor TR1 for trigger actuation goes into the blocking state. The engine M is turned off and the The draw does not take place immediately, even if the trigger switch S ¥ 5 is held down.

However, after the period determined by the variable resistor or rheostat VR1 and the capacitor C1 has elapsed, the Circuit SC1 activated again, so that the triggering transistor TR1 turns on, the motor M is set in rotation to initiate the exposure.

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If the release button is pressed further, the cycle "Exposure - film transport" is activated in the case of serial image recording - Interval - Exposure - Film transport "repeated continuously.

In the case of continuous picture setting, when the hand or finger is removed from the shutter release button to stop shooting, the shutter release switch SW5 opens as in the case of single picture shooting, so that the switch SW5 ¹ for the winding control transistor closes and the motor M after transportation of the film is stopped over a frame, whereby the standby state for the next release is established. The interval between the film transport and the next exposure is normally varied by means of the variable resistor VR1 which determines the time constant. However, this interval can also be changed by changing the capacitance of the capacitor C1, which also defines the time constant.

The second embodiment of the invention is shown in FIG. 2, in which the parts corresponding or equivalent to the parts of FIG. 1 are denoted by the same reference numerals and are therefore not explained in more detail. 3 illustrates a third embodiment of the invention, in which a thyristor, for example a silicon-controlled rectifier or a four-wire triode (SCR), is provided as a switching device for controlling the film transport. Here, the parts corresponding to the parts of FIG. 2 are again denoted by the same reference numerals. This third Ausführangsforai ä®r Srfindung operates practically in the same manner as the embodiment described first, so that its detailed explanation is omitted.

At the irisr-tüs Aiisfütaangsfora d © r> Eye fixation according to fig., In whichever way the reference numerals from FIGS. 2 and 3 are used

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Corresponding reference numerals are used, instead of the switch SW5 ¹ for the winding control transistor of the embodiment described first, a relay switch RL1-2 of the winding control relay RL1 is provided, which is operated by the trigger switch SW5. In this embodiment, which uses relay RL1 for film transport, the switch coupled to the release button can also simply be a release switch SW5. Since a switch SWR for remote control is connected in parallel with the trigger switch S ¥ 5, the motor drive device can therefore be operated remotely via two lines.

As is apparent from the above description, it is in the motor control device for cameras of the present invention possible by arranging a switch coupled to the release button for the switching element controlling the film transport, to completely cut off the current to the semiconductor element for the control of the film transport. In the case of still pictures becomes consequently even if the release button is kept pressed or even if the main switch is turned on remains closed, power consumption by the semiconductor element controlling the film transport is completely switched off, while at the same time an erroneous or incorrect operation of the semiconductor element controlling the film transport is avoided. This increases the efficiency of the camera motor drive as well as practical Greatly improved usability of the camera.

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Claims (3)

Claims 1. Motor drive device for a camera, characterized by a motor for triggering a Shutter for the purpose of film exposure and for winding or transporting a film »through a first switching device to control the motor for film transport and by a second switching device to control the Motor for the shutter release, the former being Switching device a switching element and a Has switch that has a camera release button cooperates to the switching element when pressed! Trigger button the camera in the locked state and when not with the shutter button pressed bring. 2. Device mm. & H Anspraela i ₉ thereby that the switching element is a transistor » 3. Device saaeö, Anspnaeli 1 _e , characterized in that the switching element ®la thyristor iet _e 509828/0651 ΛΑ Blank page