JPS6114625A - Film frame number display device - Google Patents

Abstract

PURPOSE:To discriminate whether a film is fed normally or not by providing a displaying circuit for counting a film wind completing signal in response to an output of a film feed detecting means, and displaying the number of frames of the film in accordance with a count value. CONSTITUTION:When a film is fed by one frame portion, and film widing is completed, a switch SW4 becomes off, an output of a decoder 33 is switched to Q2 from Q1, a transistor Tr1 becomes off, a motor 28 stops and stops turning of a spool. Also, when the SW4 is shifted to off from on, an input terminal to a gate 21 becomes high, and a counter 24 is counted up by one step. Therefore, whenever the feed is started, a one-shot circuit 31 is triggered, a counter 32 and an FF50 are reset, and when an SW3 is turned on and off by the counter 32, a film feed display by patterns 18a-18c and count-up of the counter 24 by a shift of the SW4 are executed. In this way, whether the film is fed normally or not can be discriminated.

Description

[Detailed description of the invention] The present invention relates to a camera film number display device.

Conventionally, film number display devices detected the completion of shutter winding and caused a counter to perform a counting operation, so even if no film was stored,
Further, even if the film is not actually being fed, the film count advances each time it is wound and this is displayed.

Therefore, in the conventional apparatus, it was not possible to determine whether or not the film was being fed normally just by looking at the displayed value indicating the film count value.

The present invention has been made in view of the above-mentioned matters, and includes a winding completion signal forming means (corresponding to SW4 in the embodiment) that outputs a winding completion signal upon completion of film winding, and a film feeding mechanism that outputs a winding completion signal. Feed detection means (corresponding to SW3.32 in the embodiment) for detecting the feeding state, and a counter circuit (corresponding to SW3.32 in the embodiment) for counting the winding completion signal in response to the detection output of the feed detection means (SW3.32 in the embodiment). G
Corresponds to 21 and 24. ) and a display circuit (corresponding to 29°13 in the embodiment) that displays the number of film frames according to the count value of the counter circuit.
Only when the film is actually fed, the counter is incremented by the winding completion signal, and you can check whether the film is being fed normally or not just by looking at the progress state according to the displayed value of film winding K. It is an object of the present invention to provide a film frame number display device that makes it possible to identify the number of film frames.

Next, a display device according to the present invention will be explained.

FIG. 1 is a configuration diagram showing one embodiment of a film detection mechanism in a camera to which a display device according to the present invention is applied, FIG. 2 is a top view showing the external appearance of the camera to which the present invention is applied, and FIG. FIG. 2 is an explanatory diagram showing a display state by the display device in FIG. 2;

In FIG. 1, l is a film cartridge, and 2 is a normally open switch SW! when the cartridge is stored in the camera and pressed by the cartridge at the moment of death. These pins turn on and constitute a cartridge presence/absence detecting member. In the embodiment, the pin 2 is configured to come into contact with the end surface of the cartridge, but it is also possible to provide a pin that comes into contact with the side surface of the cartridge to turn on the switch SW when the cartridge is stored.

4 is the spool, and the leader part 3 of film 3 is attached to the spool claw.
The film is wound around the spool surface by engaging the perforations a and rotating in the direction of the arrow. The spool is provided with a small diameter section 4a coaxial with a large diameter section forming the film winding surface.

5 is a lever that is pressed by a spring 6 in the direction of the spool surface,
The tip end 5a of the lever is always connected to the small diameter 4 of the spool.
It is in contact with a. The lever is further provided with a protrusion 5b, and the normally open switch SW1 is turned on by the action of the protrusion 5b. These switch levers 5 constitute a film presence/absence detecting member.

Reference numeral 7 denotes a roller which presses against the film surface and rotates as the film is fed, and this roller is coaxially provided with a cylindrical rotating body which rotates integrally with the roller. The rotating body is provided with alternating conductor and non-conductor contact patterns, and by rotating in the same direction, turns on and off the contacts of the switch SW.

These rollers, rotating bodies, and switches constitute a film feeding detection member. As a film feed detection member, instead of a roller, a gear that engages with the burrow is provided, and the rotating body is rotated during the film feeding operation, and instead of providing a contact pattern on the rotating body, a gear wheel that engages with the burrow is used. It is also possible to provide unevenness and configure the switch to be turned on and off by the unevenness. Further, instead of the external mechanical detection method of the embodiment, a known photoelectric type or capacitance type detection configuration may be used.

In the external appearance of the camera shown in Fig. 2, 9 is a camera grip part, 1O is a release button, and 11a is a button for inputting photographing information such as shutter speed, etc. Information is set by pressing this button. Ru. llb is a switch button for an illumination source for illuminating a display 13 constituted by, for example, a liquid crystal display, and 12 is a film rewinding crank.

FIG. 4 is a circuit diagram showing an embodiment of a display device according to the present invention.

In the figure, SW4 is a switch that is turned off when the winding is completed and is about to start winding.

is a switch that turns off when no rewind operation is being performed.
33 connects the human power A and B to the switches sw, sw,
35 is the Q of the decoder 33 above.
This is a winding timer which counts pulses from the clock pulse generator 34 for a predetermined period of time, and sets the output to low from 7.i.

G6 is an AND gate that connects one input to the output of the timer 35 and the other input to the Q output of the decoder 33, and the output of G6 is connected to the base of the transistor Tr via the OR gate G. are doing.

28 is a spool drive motor connected to the collector of the transistor Trl.

32 is a Johnson counter for counting pulses from the switch SW, and the up/down terminals U/D of this counter are OR gates G.

It is connected to the Q-=Qt output of the decoder 33 through. Each of the outputs Q+ to Q of the counter 32 is connected to one input terminal of OR gates 01 to G, respectively. The other input of these gates G, ~G, is connected to the Q, output of the decoder.

1, , I is an inverter connected to the above-mentioned switch sw, , 5WtK, q, ~G, 1 has its input terminal connected to a Nant gate G1, a gate G, ~G1, an inverter 1 . It is an AND gate that connects to .

This is an AND gate whose inputs are the signals of G21U, inverter Il+flipflop ptub 50, and switch SW4, and whose output is connected to frame counter 24.

24 is a film frame counter connected to the gate 021.

29LLCD datato 2 IPer, output 518C drives pattern 18C in the display 13 of FIG.
The output of the gate G drives the pattern 18b, and the output of the gate G drives the pattern 18a. Further, the output sty is the output of the inverter 2, which drives the pattern 17, the output StS is the output of the inverter E, which drives the pattern 16, and the output S+g is a 7-segment pattern representing a film frame based on the output of the counter 24. 15.

The PUC is a power-up clear circuit that outputs a power-up clear pulse when the battery is inserted into the camera.
, 31 and 36 are one-shot circuits, and this one-shot circuit 31 is triggered in response to the output of the above-mentioned game controller Gm.

Further, 34 is a pulse generation circuit that outputs 1024H2 and 2H2 p-suk pulses.

Further, 50 is a flip-flop that is reset by the output of the gate G20 and set by the output Q of the counter 32.

Next, the operation of the display device according to the present invention will be explained.

When the film cartridge is stored in the camera, the pin 2 is pressed down at the end of the cartridge and the switch SW is turned on.

Therefore, the output of the inverter 29 becomes high, and the output srs of the driver 29 becomes low.The film cartridge-shaped pattern 16 is driven and displayed, and the display type is as shown in FIG.
The screen changes from 1) to as shown in FIG. 3, 1bl, and it is displayed that the cartridge is stored.

Also, the film leader portion 3a is engaged with the spool claw and the release button 10 is pressed.

In this way, exposure is performed and when the exposure is completed, the switch SW is turned on in conjunction with the shutter. (Film feeding during exposure in this case) Since this is performed for the purpose of operation, it is assumed that the shutter time is set to a short time. ) When the switch SW is turned on, the decoder 33 outputs Q.
, outputs a high level signal from the output. (Switch S
Since W is turned on only during the rewind operation, the decoder 33
Only the A input of is high. ) This Q output triggers the one-shot circuit 36 and resets the timer 35 to its initial state, and the count enable terminal C
Since the output of Q is transmitted to E, the timer 35 starts counting pulses from the pulse generator 34. As mentioned above, since this timer makes the output high from the initial state until it counts a predetermined number of pulses, the AND gate G,
The outputs of and G also become high for one hour of the timer, the transistor Trl is turned on, the motor 28 rotates, and the spool 4 is rotated in the direction of the arrow. As a result, the film 1 is wound onto the spool, the roller 7 rotates as the film is fed, and the switch SW performs on/off operations. On the other hand, when the motor starts rotating, the one-shot circuit 31 is triggered by the high level signal from the gate G, and the pulse is transmitted to the counter 32 via the gate G1, and the counter has shifted to the initial state. The counter 32 counts pulses generated by the on/off operation of the switch SW from an initial state. Also, at this time, since low is being transmitted to the U/D input of the counter, the counter 32 is in up mode, so - when one pulse is counted in the above pulse counting, the output Q becomes high. . Therefore, no is applied to the single force of the AND gate G through the gate G. The high voltage from the inverter ■ is applied to the other input of the gate G, and the gate G
.

Since the output of gate G is applied and the output of gate Gy is high during one hour of the timer 35, gate G outputs high in response to the output of gate Gs, and the driver output is 818 m. The line-shaped feeding pattern 18a arranged in the extending direction from the bottom of the cartridge-shaped pattern 16 is driven to change the display form as shown in FIG. 3 1dl. When another pulse is input to the counter, the Q+ -Qt high output of the counter becomes high.Similarly, gates G1 and G1° become high, driver outputs 518a and 518b output high level, and line patterns 18m and 18b are generated. is driven to change the display form as shown in FIG. 3, 1dl. After that, when another pulse is input, the output Q+ -Qs of the counter becomes high, the gates G, ~GI0 output high, and the output of the driver 818a=818c becomes high, pattern 18
A to 18c are driven to further shift the display form as shown in FIG. 3 (-).

When the Q3 output of the counter 32 becomes high, the flip-flop 50 is set.

When the film is fed by one frame with this pressure, the display form changes as shown in FIG.

Further, when the leading edge 3b of the film comes into contact with the lever 5 during the film feeding, the lever 5 is pushed by the leading edge 3b of the film and rotates clockwise, thereby turning on the switch SW. When this switch SWI is turned on, the inverter ■ outputs a high level, and the output 817 of the driver becomes high. The shape of the film winding section and the film are loaded, and the character (ADOK) pattern 17 representing the important information is shown in FIG. 3, 1fl. will be displayed to indicate that autoloading has been performed.

As described above, the film is fed by one frame, and when the winding of the film is completed, the switch SW4 is turned off and the output of the decoder 33 is switched from Q to Q. Therefore, the transistor Trl is turned off, the shifter 28 is stopped, and the rotation of the spool 4 is stopped.

When the above-mentioned switch SW changes from on to off, one input terminal to G21 becomes NO1.

At this time, as mentioned above, the 7-lip flop 50 is set and the switch SW is on, so all the other input terminals of the gate G20 are high, and the output of the siquanter 24 is 1. Step count up.

Thereafter, each time the release button is pressed, the motor 28 is energized to feed the film, and at the start of each feed, the one-shot circuit 31 is triggered, the counter 32 and the flip-flop 50 are reset, and the counter 3
2, by counting the on/off of the roll switch SW, the film advance display and flip-flop 500 are set according to the patterns 18a to 18c described above each time the film is fed, and when the switch SW4 is turned off when winding is completed, one step of the counter 24 is activated. A count-up is done at the end of each feed.

In addition, the driver 29 has a count value of the counter 24 from 0 to
During 2, select only the central segment of the 7 segments and drive the m-) display. When the count value is 3, display in 7 segments. (1) For counts of 3 or more, display the displayed value in sequence. Since the camera is designed to advance and display the film, the number of film frames (1) is displayed during the film feed, and when the film has been advanced by 3 frames and the beginning of the film to the shooting position is completed, the film frame number 1 is displayed. The number of frames taken will be displayed.

As described above, in the present invention, only when the film is being fed and the winding is completed, the counter performs the counting operation to increment the number of film frames. It is possible to determine whether the film is being fed normally by checking whether or not the film frame number display is progressing in conjunction with the winding operation, which has a great effect on the film number display device. It is something that plays.

In the embodiment, the display is performed outside the camera, but if the above display is also performed inside the viewfinder, a display connected to each output terminal of the driver 29 is arranged inside the viewfinder as shown in Fig. 5. Just do it.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an example of a film detection mechanism in a camera to which a display device according to the present invention is applied, FIG. 2 is an external view of a camera having a display device according to the present invention, and FIG. 4 is an explanatory diagram showing the display state of the display device according to the present invention, FIG. 4 is a circuit diagram showing an example of a display circuit constituting the display device according to the present invention, and FIG. 5 is a diagram showing the display device of the present invention in a viewfinder FIG. 3 is a configuration diagram showing the arrangement when internal display is performed.

Claims (1)

[Claims] a winding completion signal forming means for outputting a winding completion signal upon completion of film winding; a feeding detection means for detecting a film feeding state by the film feeding mechanism; A film frame number display device for a camera, comprising a counter circuit that counts the winding completion signal, and a display circuit that displays the number of film frames according to the count value of the counter circuit.