JP3400517B2 - Camera film winding device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film winding mechanism for a camera at the end of a film in an automatic film winding camera due to the tension of the film, and more particularly to a film winding device for a camera.

[0002]

2. Description of the Related Art In conventional automatic hoisting cameras, the strength of the gears is designed to withstand the tension generated at the end of the film during normal low-speed hoisting. At such a relatively slow hoisting speed, I was not worried about gear breakage, but I was concerned about it when hoisting at high speed.

That is, in such a camera, the amount of tension at the end of the film depends on the speed of the film at the end of the film and the starting torque of the hoisting motor, and the influence of the speed of the film particularly affects the speed. It increases exponentially with the increase.

That is, the conventional camera can prevent the gear breakage only at a relatively low winding speed, and cannot prevent it at the time of high-speed winding because of the relationship between the film speed and the tension at the end. .

Therefore, as described in Japanese Patent Laid-Open No. 62-147437, when the DX code attached to the film cartridge is read and the specified number of frames is reached,
It has also been proposed that automatic rewinding is started to prevent the gears of the hoisting system from being damaged by the tension generated at the end of the film even at a relatively high hoisting speed.

[0006]

As described above, in the conventional camera, when the gear breakage due to the tension at the end of the film is prevented by only the strength of the hoisting system gear, the hoisting speed of the film is relatively high. Limited to slow speeds, unable to withstand high speed winding.

Therefore, further improvement of the strength of the gear by the material, size, etc. of the gear is an obstacle to the cost reduction and size reduction of the product. Further, the above-mentioned JP-A-62-14
In the proposal described in Japanese Patent No. 7437, the frames after the specified number of frames of the film are forcibly rewound without being photographed, which is completely wasted.

In a normal film, although there is a margin of 1 to 3 frames with respect to the specified number of frames, depending on the idle feed amount at the time of loading, it is possible to use this part without wasting it in many current cameras. It is possible.

Further, in the proposal of the above-mentioned Japanese Patent Laid-Open No. 62-147437, since the specified number of frames of the film is detected by the DX code, in the film without the DX code,
No effect.

Therefore, the present invention has been made in view of the above points, and in order to solve many drawbacks of the prior art at the same time, it is necessary to increase the strength of the hoisting system gear. A film winding device for a camera capable of achieving a high winding speed without wasting a portion of the film after a specified frame or excluding a film that does not correspond to a DX code. It is intended to be provided.

[0011]

According to the present invention, a fill
By rotating the winding spool,
Fill the film by winding the film on the LUM winding spool.
A winding motor as a driving source for performing transmission beam supply, and film speed detecting means for detecting a feed speed of the film, the full
In the vicinity of the end of the film during film feeding,
If the film feed speed is
End detection means for detecting a drop and outputting a detection signal , and
Depending on the detection signal more output to serial end detection means
Te, the hoist motor of times the control for the control unit to reduce the rotation speed, camera film winding apparatus characterized by comprising a are provided before the tension in the film end is generated.

According to the present invention, the film winding spool is rotated to drive the film to be wound around the film winding spool to feed the film, and the winding motor, and the film. of the film speed detecting means for detecting a feeding speed, it had us in feeding the film loading, top SL film speed detected by the detecting means a film end to be full Irumu feed speed becomes a predetermined value and end detecting means for outputting a detection signal by detecting before the tension is generated in, in accordance with the detection signal output by said end detection means, feeding of the film before the tension in the film end is generated Sending speed
And a control means for controlling the rotation speed of the hoisting motor to be decreased without stopping the hoisting motor in accordance with the decrease of the film winding speed. To be done.

[0013]

In the film winding apparatus for a camera according to the first aspect, the film winding spool is rotated by a winding motor which is a drive source to wind the film around the film winding spool and feed the film. The film speed detecting means detects the film feeding speed, and the end detecting means detects a rapid decrease in the film feeding speed by the film speed detecting means near the end of the film during film feeding. A detection signal is output, and the control means controls so as to reduce the rotation speed of the winding motor according to the detection signal output by the end detection means before the tension is generated at the film end. . In the film winding apparatus for a camera according to claim 2, the film winding spool is rotated by a winding motor that is a drive source to wind the film around the film winding spool for film feeding. the film speed detecting means detects the feed speed of the film, that the film feed on your stomach into feed SL film speed detected by the detecting means a film feeding speed becomes a predetermined value by the end detection means Detects before the tension at the film end occurs and outputs a detection signal, and according to the detection signal output by the end detection unit by the control unit,
Before the tension occurs at the end of the film, the fill
The rotation speed of the hoisting motor is controlled without stopping the hoisting motor in response to the decrease in the feeding speed of the hoisting motor . That is, in the present invention, by detecting the end of the film according to the feeding speed of the film, the occurrence of tension at the end of the film is detected in advance to control the winding of the film. In addition, it is possible to reduce the rotation speed of the film winding motor to a level at which the winding system gear is not destroyed, or apply a brake to stop the feeding.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1A, 1B, and 1C are a front view of the camera, a rear view of the camera with a rear lid opened, and a top view, respectively.

Here, 1 is a camera body, 2 is a stroboscopic light emitting portion, and the user picks up the projection of the light emitting portion 2 and pushes the light emitting portion 2 out of the main body to the position shown in FIG. 1 (c). The main switch (not shown) is turned on.

Reference numeral 3 denotes a DX detection terminal, which has three terminals for film sensitivity detection and one common ground terminal arranged on the left column, and one terminal for detecting the specified number of film frames arranged on the right column. Further, 4 is a patrone chamber, 5 is an exposure aperture portion, 6 is a spool chamber, and 7 is a mode switching button for correcting the date and time of the quartz date and arranging the date.

Reference numeral 8 is a midway rewind button, 9 is a viewfinder eyepiece, 10 is a viewfinder diopter adjustment knob, and 11 is a panorama mode switching knob. By switching the knob 11, a black mask (not shown) for panorama is inserted above and below the field of view in the viewfinder and the exposure aperture.

Further, 12 is a part of the rear lid, 13 is a zoom button, 14 is a setting button for the self-timer mode and remote control acceptance mode, and 15 is a liquid crystal display (LC) for display.
D), 16 are shooting mode buttons for switching various shooting modes of the camera, 17 is a strobe mode button for switching strobe modes, and 61 is a release button.

Reference numeral 18 is a perforation detecting photoreflector for detecting the movement of the perforation of the film and correctly feeding one frame at the time of winding.

Reference numeral 19 denotes a roller which rotates following the movement of the film, and the rotation is monitored by a roller rotation detection photo reflector 38 (shown in FIG. 4) inside the camera.

Reference numeral 20 is a window for imprinting characters on the quartz date. Normally, the date is imprinted digit by digit from the upper window in synchronization with the movement of the film.
Imprint from the lower window.

FIG. 2 is a detailed view of the display LCD 15,
Each time the flash mode button 17 is pressed, the flash mode is AUTO, AUTO-S (red-eye reduction mode), OFF,
The display changes to FILL-IN (daytime sync mode) and only the selected strobe mode lights up.

Each time the photographing mode button 16 is pressed, the photographing modes are spot metering, distance measuring 31, night scene mode 32,
The display changes between continuous shooting mode (Continuous) 33, landscape mode 34, and normal mode (no display).

When the continuous shooting mode is selected, shooting is continuously performed while the release button 61 is being operated. Reference numeral 35 is a date and time display of a quartz date, and 36 is a display of the number of film frames.

FIG. 3A shows the cartridge chamber 4 of FIG. 1B.
3A to 3g in FIG. 3A are DX contact pieces for reading DX information of the cartridge. Here, contact piece 3
a is a common (ground) terminal, contact pieces 3b to 3d are for detecting film sensitivity, and contact pieces 3e to 3g are for detecting the number of specified frames of the film.

As shown in FIG. 3B, a CP (not shown) is used to determine the specified number of frames of the film by the contact pieces 3e to 3g.
Since it is carried out by U or the like, it is possible to determine whether the number of frames of the film to be used is 12, 20, 24, 36 or 72 and whether it is a patrone with DX information.

In FIG. 3 (b), when ON, each terminal is 3a.
A terminal indicates a conductive state, a − indicates that each terminal is in a non-conductive state with the 3a terminal, and if all are −, it is discriminated that it is not a DX-compatible patrone.

FIG. 4 shows a block diagram of an electric circuit including a circuit block, a sensor, an actuator, a switch, a contact piece and the like which constitute this embodiment. In FIG. 4, the photo reflector 18 is a perforation 4 of the film 39.
The sensor detects 0, and its output is input to the film feed amount detection circuit 46.

Each time the detection signal whose waveform has been shaped by the film feed amount detection circuit 46 is counted for 8 perforations, a pulse for counting up the number of frames is sent to a winding frame number counting circuit (not shown).

The output of the film feed amount detection circuit 46 is also sent to the hoisting motor control circuit 48 at the same time, and is sent to the hoisting motor 47 when 8 perforations are counted, that is, when one film is fed. Braking is also done.

In the above embodiment, the film feed amount may be detected by the output of the roller 19 driven by the film feed by being arranged so as to be in pressure contact with the film.

A polygonal prism aluminum plated reflector 37 is coaxially attached to the roller 19. As a result, the output of the roller rotation detection photo reflector 38 changes as the roller 19 rotates.

The output of the photo reflector 38 is waveform-shaped by the roller waveform shaping circuit 41 and sent to the date imprinting circuit 42. As a result, the date imprinting LED 43 emits light in synchronism with the movement of the film 39, thereby enabling the date imprinting on a predetermined portion of the photographed frame of the film 39.

That is, in this embodiment, since the date imprinting LED 43 has only one character "day" -shaped portion and the apostrophe "'" light emitting portion, the date imprinting LED 1 is sequentially switched in accordance with the movement of the film 39. It is possible to emit light for each character and imprint a predetermined number of characters of data (date etc.).

The output of the roller waveform shaping circuit 41 is
Further, it is sent to the film feeding speed detection circuit 44, and the film feeding speed is detected as described later. That is, here, the film feeding speed is obtained by counting the reference clock pulse for the interval of the pulse output from the roller waveform shaping circuit 41.

The film end detection circuit 45 to which the film speed detection output from the film feeding speed detection circuit 44 is supplied detects the film end as follows. That is, when the film speed detected as described above changes and becomes abruptly slow, or reaches a low speed that does not occur in normal winding, the film end detection circuit 45 detects that the film end has been reached. Then, a hoisting motor stop signal is sent to the hoisting motor control circuit 48.

The film end detecting circuit 45 stores the count value output from the film speed detecting circuit 44, and compares the stored count value with the count value output at the next timing after the storage. , And outputs a termination detection signal when there is a difference of a predetermined value or more.

The film end detection circuit 45 outputs the end detection signal when the count value from the film speed detection circuit 44 is not more than the value corresponding to the low speed which does not occur in the normal winding without performing the above comparison. It may be configured as follows.

Further, as a result of the above comparison, the film end detecting circuit 45 detects that a difference occurs continuously more than a predetermined number of times when the film feeding speed is gradually decreased. It may be configured to output a termination detection signal.

As described above, since the hoisting motor 47 is stopped before the tension is generated at the end of the film, the hoisting system gear is not damaged. The same effect can be obtained by reducing the hoisting speed to the speed at which the gear breakage occurs or less without stopping the hoisting motor 47 in response to the detection of the trailing end.

In this case, there is no fear that the winding will be stopped and the film will not be completed even if the film end has not been reached due to the erroneous judgment of the film end detection circuit 45. The speed can be reduced by reducing the voltage applied to the hoisting motor 47, changing the duty ratio of the applied voltage, or the like.

Next, the above operation will be described with reference to the time charts of FIGS. FIG. 5 is a time chart when the film winding control at the film end according to the present invention is not performed.

In the winding after the last frame is photographed, the pulse from the roller waveform shaping circuit 41 is T at the end of the film.
Stop at ₂ However, the winding motor 47 continues to rotate until the slack of the film wound on the spool is completely wound, that is, during the period of T _{2 to} T ₃ .

When there is no slack in the spool, the hoisting motor 47 suddenly decreases in speed. At this time, a large tension corresponding to the acceleration (dw / dt) and the motor torque is applied to all transmission members between the motor including the hoisting system gear and the cartridge.

This leads to breakage of the hoisting system gear between T _{3 and} T ₄ . Next, the winding sequence after the final frame will be described with reference to FIG. 6 as an example of performing the control according to the present invention.

Upon receipt of the output of the film feeding speed detecting circuit 44, the film end detecting circuit 45 detects that the film feeding speed has changed abruptly or has fallen below a predetermined value at the time of FIG. 6T ₁ . To detect.

In the example of FIG. 6, the film end detection circuit 45
Informs the hoisting motor control circuit 48 that the voltage of the hoisting motor 47 should be reduced from 6V to 3V. For this reason,
Immediately after T ₁ , as the motor voltage drops, the rotation speed of the hoisting motor 47 drops to about half of the previous speed.

As a result, at the time of T ₃ when the motor rotation corresponding to the slack of the film on the spool is completed, the motor rotation speed is lowered to the extent that the winding system gear is not damaged, and the rotation speed is between T _{3 and} T _4. Gear damage does not occur.

The signal from the perforation 40 may be used instead of the signal from the roller 19 to detect the feeding speed of the film 39, but the control of the present invention is such that the movement of the film is almost stopped. from to, the spool during winding languor Mi of the film is wound Flip fit, i.e. T ₁ because it must take place between the through T ₃ in terms of the response of the photo-reflector 38 from high frequency roller 19 It is advantageous to use signals.

For this reason, in this embodiment, the polygonal prism reflector 37 for detecting the rotation of the roller 19 is set so as to generate about 60 pulses per film frame with respect to the photo reflector 38. This is the date imprint LE
It may be the same as the light emission interval of D43.

As described above, while the film 39 is being wound with the winding speed being lowered, the film 39
Reaches the end, the movement of the perforation 40 portion of the film 39 facing the photo reflector 18 is stopped.

In this state, the film feed amount detection circuit 46
Detects that the pulse signal from the photo reflector 18 has not been input for a predetermined period, it outputs a break signal to the hoisting motor control circuit 48.

However, the timing of outputting this break signal is not shown in FIG. Then, the hoisting motor control circuit 48 short-circuits the both ends of the hoisting motor 47 when the above-mentioned break signal is inputted, so that the hoisting motor 4 is connected.
Break 7 and stop.

In the above-mentioned embodiment, the case where the hardware circuit is used has been described, but instead of this, a microcomputer (CPU) may be used to perform sequence control processing by a software program, and the same effect can be obtained. You can

According to the above embodiment of the present invention, the following configuration can be obtained. (1) A film speed detecting means for detecting a film feeding speed, an end detecting means for detecting a film end based on the film feeding speed detected by the film speed detecting means, and an end detecting means. A film winding device for a camera, comprising: a control means for controlling the winding of the film according to the detection of the end.

(2) The film winding device for a camera according to (1) above, which has an electric motor for winding up the film. (3) The film winding device for a camera as described in (1) or (2) above, wherein the control means stops winding the film in response to the detection of the end.

(4) The film winding device for a camera as described in (1) or (2) above, wherein the control means reduces the film winding speed in accordance with the detection of the trailing end.

(5) The camera according to any one of (1) to (4) above, wherein the end detecting means detects that the feeding speed of the film is below a predetermined value and outputs a film end detection signal. Film winding device.

(6) The film winding of the camera according to any one of (1) to (4), wherein the end detecting means detects that the feeding speed of the film is gradually decreased and outputs a film end detection signal. Upper device.

(7) The film feeding speed detecting means is
The film winding apparatus for a camera according to any one of (1) to (6) above, which detects a movement amount of a member that is interlocked with movement of the film.

(8) The film winding device for a camera as described in (7) above, wherein the interlocking member of the film feeding speed detecting means is in pressure contact with the film. (9) The film winding device for a camera according to any one of (1) to (8), characterized in that the recording timing of the data recording device is determined based on the signal from the film feeding speed detecting means. .

[0062]

According to the first aspect of the present invention, the film winding spool is rotated by the winding motor that is a drive source to wind the film around the film winding spool to feed the film. The film feeding speed is detected by the film speed detecting means, and the detection signal is detected by detecting the abrupt decrease of the film feeding speed by the film speed detecting means which occurs near the end of the film during the film feeding by the end detecting means. By outputting and controlling the rotation speed of the winding motor before the tension at the film end is generated in accordance with the detection signal output by the end detection unit by the control unit, Decrease the rotation speed of the film winding motor to a level at which the winding system gear is not destroyed and increase the film tension. The occurrence of problems due to the emission takes can be prevented. In the film winding device for a camera according to claim 2, the film winding spool is rotated by a winding motor that is a drive source.
The film in the take-up spool went by winding the film performs a film feeding, film to detect the feeding speed of the film by the speed detection means, above Symbol film speed detection means to have you in the film feeding by the end detection means The fact that the film feeding speed detected by means of a predetermined value is detected before the tension at the film end is generated and a detection signal is output, and the control means outputs the end detection means. Depending on the detection signal, before the tension at the end of the film occurs, the film
The rotation speed of the film winding motor is controlled by reducing the rotation speed of the winding motor without stopping the winding motor according to the decrease of the feeding speed. It is possible to prevent problems from being caused by applying a large amount of tension to the film by applying a brake to a level at which the film does not break. Therefore,
As described above in detail, according to the present invention, the gear of the film winding system is not increased in size, and the DX contact piece is not added or the number of the film exceeds the specified number. In addition, it is possible to provide a film winding device for a camera, which makes it possible to speed up film winding.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, (a) is a front view of a camera, (b) is a rear view with a rear lid open,
(C) is a top view.

FIG. 2 is a detailed view of a display LCD unit shown in FIG. 1 (c).

FIG. 3 is a detailed view (a) of the cartridge chamber shown in FIG. 1 (b).
(B) showing the correspondence between the number of film frames and the DX contact piece
Is.

FIG. 4 is a block diagram showing an electric circuit that constitutes the embodiment.

FIG. 5 is a timing chart when the film winding control according to the present invention is not performed.

FIG. 6 is a timing chart when the film winding control according to the present invention is performed.

[Explanation of symbols]

18, 38 ... Photo reflector, 19 ... Roller, 37
... Reflector, 39 ... Film, 40 ... Perforation, 41 ... Roller waveform shaping circuit, 42 ... Date imprinting circuit, 43 ... Date imprinting LED, 44 ... Film feeding speed detecting circuit, 45 ... Film end detecting circuit, 46 …
Film feed amount detection circuit, 47 ... Hoisting motor, 48 ... Hoisting motor control circuit.

Continuation of the front page (56) Reference JP-A-5-11325 (JP, A) JP-A-1-279228 (JP, A) Actual development Sho 63-45545 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) G03B 17 / 00,17 / 26-17/34

Claims (2)

(57) [Claims] 1. A film winding spool is driven to rotate.
To wind the film on the film take-up spool.
A winding motor as a driving source for performing the film feed went care-a film speed detecting means for detecting a feed speed of the film, resulting in a film near the end in the feeding the film loading
The film feeding speed by the film speed detecting means
And end detecting means for outputting a detection signal by detecting a rapid decrease in response to the detection signal more output to said end detection means
Te, the camera on the film winding apparatus characterized by comprising a control means for controlling to reduce the rotational speed of the hoist motor before tension is generated in the film end. 2. A winding motor, which is a drive source for winding a film around the film winding spool to feed the film by rotating the film winding spool, and a film feeding speed. a film speed detecting means detect, by have you in feeding the film loading, the tension of that upper SL film speed detecting means detected off Irumu feeding speed by a becomes a predetermined value in the film end is generated and end detecting means for outputting a detection signal by detecting before, in response to the detection signal output by said end detection means, the full before the tension in the film end is generated
A film of a camera, comprising: a control unit that controls the rotation speed of the hoisting motor to be decreased without stopping the hoisting motor in response to a decrease in the feeding speed of the film. Hoisting device.