JPS6187141A - Electric winding camera - Google Patents

Abstract

PURPOSE:To judge instantaneously the legality of film feeding by allowing the 2nd switching means for detecting the movement of a film and generating plural film moving signals during the movement of one frame of the film to change display plural times on the way of the winding. CONSTITUTION:When a motor control switch SW5 is turned on, a signal is inputted to a counter 63 through an inverter I3 and a chuttering preventing circuit 64 and the counter 63 is counted up by '1' by a winding completion signal. When a signal from an output Q3 of the counter 63 is turned to '1', a signal '2' is inputted to an input S of a flip flop (FF)62 and a signal from an output 'Q' of the FF62 is turned to '0', so that the motor is kept at stopped status under the winding completion status. The contents of the counter 63 are displayed on a display unit 13 through a decoder 65 and a driver 66. Consequently, the auto-loading of a film can be attained by an extremely simple constitution and the photographer can easily judge the fail or success of the auto-loading.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to autoloading of a motorized wind-up camera.

(Prior Art) In recent years, electric winding cameras have been known in which film is wound by an electric motor.

Furthermore, there is also known a camera with an autoloading function that automatically feeds the film to the first photographic frame (blank feed) using full force when loading the film.

Therefore, it has been considered to provide the above-mentioned auto-loading function to the above-mentioned electric winding camera, and thereby it is possible to provide the camera with the auto-loading function without using a complicated configuration such as a full-length camera.

However, the conventional autoloading mechanism uses a cam of a film frame counter to determine the number of frames in the blank feed (usually about 3 frames) after loading the film, and the displacement of this cam is detected. Moreover, converting the detection into an electric signal and sending it to the motor drive circuit requires a complicated configuration, and with the conventional mechanism, problems such as autoloading failure and film running out during empty feeding occur. However, it was not possible to discover it, which caused a problem.

(Object of the invention) This invention was made to solve the above-mentioned conventional problems.

It is an object of the present invention to provide an electric winding camera that has a simple configuration and can perform automatic film loading using an electric motor and can instantly determine whether or not the film is being properly fed during loading. .

In order to achieve the above object, the present invention provides a film winding transmission system that uses an electric motor as a drive source, operates the electric motor when shooting is completed, and operates the electric motor when winding for one frame is completed. In an electric winding camera, which has a motor drive circuit that stops the camera and an electronic film frame number counter that counts every time a frame of film is taken, there is a motor drive circuit that generates a detection signal in response to opening and closing of the camera back. a counter control circuit that receives a detection signal from the first switch means and sets the film frame number counter to an initial counting state; a second motor drive circuit that receives a signal from the camera and forcibly operates the electric motor until the film frame number counter reaches a predetermined count value; and a second motor drive circuit that detects movement of the film and moves the film by one frame. a second switch means that generates a plurality of film movement signals by the second switch means; a display means that changes the display a plurality of times during winding of one frame in response to the plurality of film movement signals of the second switch means; It features an electric winding camera with

(Embodiment) FIG. 1 is an external view showing an embodiment of a camera with a built-in electric winding mechanism according to the present invention. In FIG. Reference numeral 12 indicates a release button, and reference numeral 13 indicates a display on which shutter speed, aperture value, photographing mode, number of films, etc. are displayed on, for example, a liquid crystal display. Reference numeral 14 denotes operation buttons for operating various parts of the camera, which operate various signal switches in the circuit described later. 1
5 is a pentaprism section, and 16 is a lens mount section. FIG. 2 is a route map showing an example of the arrangement of internal structures in the camera of the present invention. In FIG.
is arranged inside the take-up spool shaft by a motor. 2
3 is a sprocket shaft, 24 is a reduction gear train for decelerating the rotation of the motor 22 and transmitting it to each mechanism part 95
1+! 641 is a winding section of the unloading mechanism, and is connected to the sprocket shaft 23 via a gear train 24. Reference numeral 26 denotes a film rewinding section which is disposed across the lower part of the mirror box and connected to the lower part of the film cartridge. Reference numeral 27 denotes a mounting portion of each mechanical section, and the upper surface on the winding side and the upper surface on the unwinding side are connected at the upper side of the pentaprism. 28 is a focal plane shutter unit.

3 and 4 are configuration diagrams showing details of the winding mechanism in the camera of the present invention, and FIG. 3 corresponds to the upper left side inside the camera, that is, the portion 27 in FIG. 2. FIG. 4 corresponds to the lower left side inside the camera, ie, the portion 26 in FIG. 2.

That is, the mechanism shown in the third figure and the mechanism shown in the fourth figure are arranged one above the other with the winding shaft interposed therebetween, and form the inside left side of the camera body.

In Fig. 3, 22a is a pinion attached to the shaft of the motor 22, 31, 32, 33, 34 is a reduction gear train, and 31a is a leaf spring for connecting the two gears of the two-stage gear 31 by friction. be.

35 is a sprocket gear, 35a is a sprocket gear 3
A winding stopping plate 6 rotates together with the winding prevention lever 36 and is locked after winding is completed.37 is a release lever that moves in the direction of the arrow in conjunction with the movement of the rear curtain of the shutter.

38 is a signal lever linked to the back cover, which turns on SW3 when the back cover is closed.

In Fig. 4, 35b is the sprocket gear 3 of Fig. 3.
The winding plate 42 is rotated via a two-stage gear 41 by a notched gear that rotates together with the winding plate 5. 43.44 is winding plate 4
The slide plate 43 is a slide plate that slides to the left or right by the right rotation of 2. The slide plate 43 charges a charge lever 45 of a shutter (not shown) with a pin 43a, and the slide plate 44 controls an aperture control mechanism and a mirror with a pin 44a. Charge the charge lever 46 of the actuation mechanism.

A film feed detection drum 47 is loosely fitted coaxially with the sprocket shaft, and rotates when the film 48 is being fed. At its end, conductor parts and insulating parts 47a are alternately arranged.

A switch sw4 is provided. Then, while the film is being fed, the switch sw4 repeats the on and off states multiple times for one frame of film as shown in the figure.
The device is configured to generate a signal for externally confirming feeding.

This signal is displayed in the display window 13 shown in the first figure by a flashing display mark 13a, and while this is flashing, it can be confirmed from outside the camera that the film is being fed.

FIG. 5 is a circuit connection diagram showing an embodiment of a circuit such as an electric winding section of a camera according to the present invention.

In the figure, E is the power supply, 5W1 is the power switch, sw2
is a release switch that is turned on by the release button,
sw3 is a back cover signal switch that turns on when the back cover is closed, s
w4 is a film feed switch that is turned on when feeding film;
sw5 is the aforementioned motor control switch, and sw6 is a winding completion safety switch. R1 is a pull-up resistor, II
, I2. I3. I4 is an inverter, Gl is an OR gate,
G2 is an anti-gear transistor, Tr2 and Tr3 are transistors, and Mgl is a release magnet, which is released when energized from the capacitor Ct. Mg2
is a shutter control magnet Rvt is a variable resistor for shutter speed control, CT is a capacitor for shutter speed control, s
w7 is a trigger switch for operating the time-fixed circuit.

61 is an R detour, 62 is an R-S flip-flop, 6
3 is a counter, 64 is a chattering prevention circuit, 65 is a decoder, 66 is a display driver, and 13 is a display composed of a display element such as a liquid crystal, such as the display shown in FIG. 67 is a differential circuit, 68 is a Schmitt circuit, and 22 is a motor for one winding, which is controlled by a motor control switch sw5.

Next, the operation of the camera with a built-in electric winding mechanism of the present invention will be explained in the third section.
This will be explained with reference to FIGS. 4 and 5.

In FIG. 5, when the power switch sw1 is turned on and power is supplied to the circuit, if the winding is not completed, that is, the winding prevention lever 36 in FIG. The switch sw5 is in the OFF state, the motor M shown in FIG. When the back cover is opened, a film is loaded, and the back cover is closed, the signal lever 38 shown in FIG. 3 rotates to the right against the spring 38a, turning on the back cover signal switch sw3.

Therefore, the signal from the back cover signal switch sw3 resets the flip-flop 62 and the counter 63 via the inverter 2 and the differential circuit 67 shown in FIG. When the flip-flop is reset, it outputs a high-level signal "1" from Q, so this is input as a "1" signal to AND gate G2 via OR gate G1.At this time, the camera Since the winding is completed, the signal from the motor control switch sw5 is inputted as a signal ``1°'' to the AND gate G2 via the inverter !3 and the 8 extension circuit 61, and the signal from the winding completion safety switch sw6 is inputted to the AND gate G2 as a signal ``1°''. Since the signal is also input to the analog gate G2 as the signal ゛I II via the inverter 4, the signal ``°l'' is output from the AND gate G2, which makes the transistor Tr1 conductive and releases the release magnet M.
gl is energized and a release operation is performed.

In addition, the Q output of the flip-flop 62 becomes a low level signal "0", which makes the transistor Tr2 of the shutter control circuit conductive and rapidly charges the time setting capacitor G regardless of the preset shutter time value. Therefore, the shutter control magnet Mg is controlled via the Schmitt circuit 68 at a timing earlier than the maximum speed, and the shutter runs in the closed state. Then, after the shutter runs, the shutter control magnet Mg is controlled at a timing earlier than the maximum speed. The lever 37 moves in the direction of the arrow in conjunction with the rear curtain, rotates the winding prevention lever 36 to the left against the spring 36a, and turns the motor control switch sw5.
turn off. When the motor control switch sw5 is turned off, the transistor Tr3 shown in FIG. 5 becomes conductive, and the motor 2
2 starts rotating.

The rotation of the motor 22 in FIG. 3 is controlled by the gear train 31 for reduction.
, 32. Via 33 and 34.

The information is transmitted to the sprocket gear 36, the notch gear 35b in FIG. Charges the aperture control mechanism, etc. When charging is completed, the connection between the notched gear 35b and the two-stage gear 41 is severed, and the winding plate is moved by the spring 44. With force b, it begins to rotate to the left in the opposite direction of the arrow.

Further, the winding stop plate 35a integral with the sprocket gear 35 shown in FIG. 3 is locked by the winding prevention lever 36, the motor control switch sw5 is turned on, and the power supply to the motor is cut off. Even if the power supply is cut off, the motor tries to continue rotating due to inertia, but its kinetic energy is consumed by sliding the friction coupling by the spring 31a of the second gear 31, and an excessive load is placed on the winding prevention lever 36. Even after the e5 raising is completed, the signal from the motor control switch sw5 is delayed for a predetermined period of time by the delay circuit 61 in FIG. be done.

Note that if the camera's internal mechanism malfunctions if the release is performed before the slide plate in Figure 4 has completely returned to its original state, the camera's internal mechanism will malfunction. Winding completion safety switch sw6
is provided.

Therefore, when the motor control switch sw5 in FIG. 5 is turned on, a signal from this is input to the counter 63 via the inverter 3 and the chattering prevention IT circuit 64, and the counter 63 reaches this winding completion signal and counts up by one. .

After that, the release signal is output again from the anti-game) G2, and the relay operation and winding operation are repeated several times and input to the counter 63, and the Q3 output of the counter becomes the signal
II, the signal "2°" is input to the S input of the flip-flop 62, and the Q signal of the flip-flop becomes "0".
”, or game) From Gl, it is no longer °“1
Since °゛ is not output, use the release button.

Unless the release switch sw2 is turned on, the motor remains in the stopped state with the winding completed.

Note that the shutter control circuit also uses the Q of the flip-flop 62.
Since the transistor Tr2 is turned off when the output becomes "1", the shutter timing is controlled by the shutter timing resistor Rvt.

Furthermore, the contents of the counter 63 are stored in the decoder 65 and the driver 6.
6 is displayed on the display 13 via the decoder 65 driver 66. When the film feed switch sw4 shown in FIG. A display is made on the display 13 as shown in FIG.

(Effects of the Invention) As explained above, the present invention sets the electronic film frame number counter to the initial state by opening and closing the back cover, and in this state, the counter reaches a predetermined count. Multiple frames were skipped until they were counted, and then the film was loaded automatically. Also, during this air feeding, multiple film movement signals are generated to check whether the film is actually being fed when one frame of film is fed, and in response to this film movement signal, it is checked during the winding of one frame. A display means that changes the display multiple times is provided. Therefore, the present invention enables automatic film loading with an extremely simple configuration, and allows the photographer to easily determine whether the automatic loading has failed or succeeded. Also, in the present invention, it is possible to understand at which stage failures occurred during autoloading.1 For example, the film was not fed at all, or the film was initially fed, but winding onto the spool failed at some stage. It is very easy to determine whether the film was initially fed or failed before part of the film leader reached the spool. can be provided.

[Brief explanation of drawings]

Fig. 1 is an external view showing an embodiment of a camera with a built-in electric winding mechanism according to the present invention, Fig. 2 is a route diagram showing the arrangement of the internal mechanism of the camera shown in Fig. 1, and Figs. FIG. 5 is a detailed configuration diagram of the winding mechanism section of the illustrated camera, and FIG. 5 is a circuit connection diagram showing one embodiment of the circuit of the camera according to the present invention. 12--------Release button, 13-----Display, 22--Motor, 35--Sprocket gear, 47--Film feed detection drum, s w 3
---One back cover signal switch, 5w4---Switch. 48------Film, 63------One counter.

Claims (1)

[Claims] (1) a film winding transmission system using an electric motor as a drive source; a motor drive circuit that operates the electric motor upon completion of shooting and stops operation of the electric motor upon completion of winding for one frame; An electric film winding camera having an electronic film frame number counter that performs a counting operation every time one frame of film is taken; a counter control circuit that receives a detection signal from the first switch means and sets the film frame number counter to an initial counting state, and receives a detection signal from the first switch means and a signal from the film frame number counter to a second motor drive circuit that forcibly operates the electric motor until a frame number counter counts a predetermined count value; and a second motor drive circuit that detects movement of the film and generates a plurality of film movement signals by moving one frame of film. and a display means that changes the display a plurality of times during winding of one frame in response to a plurality of film movement signals from the second switch means. Winding camera.