JPH02230131A - Mechanism and method for feeding and stopping film - Google Patents

Abstract

PURPOSE:To accurately feed and stop the film even when winding and rewinding the film fast by pressing a surface wave generating means against at least one surface side of the film loaded in a camera and exciting or stopping the surface wave generating means by a driving means. CONSTITUTION:Surface wave generators 1 and 2 are incorporated in the film feeding and stopping mechanism so as to clamp the film 3 on both its surfaces. When the film is stopped while no surface wave is generated, the surface wave generators 1 and 2 are in entire-surface contact with the film 3, so the film 3 can not easily be drawn out because of frictional force. The driving means applies an electric signal in the ultrasonic wave range to the surface wave generators 1 and 2 to generate surface waves and then the film 3 floats over the surface wave generators 1 and 2 momentarily and the frictional force between the film 3 and surface wave generators 1 and 2 is extremely small, so the film 3 can easily be drawn out by applying tensile force.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a film feeding stop mechanism and a film feeding stopping method, and more specifically, to film feeding and stopping in a motor-driven camera that winds and rewinds film using a motor. This invention relates to a film feeding stop mechanism and a film feeding stopping method.

[Conventional technology] In recent years, in order to improve the performance of cameras, there has been a growing trend to increase the speed at which the motor automatically winds the film.

In order to increase the speed of film winding, a Subur drive that winds the film by rotating only the Subur is advantageous, but on the other hand, it has the problem that it is difficult to achieve precision in the amount of film winding. This is because when a DC motor is used as the motor for rotating the subur, the DC motor has an inertial force and therefore does not stop immediately even if the power to the motor is turned off.

Therefore, in the "motor drive force camera" disclosed in, for example, Japanese Patent Application Laid-Open No. 55-134819, the amount of film movement is regulated by a film movement regulating member 111 such as a Subroget and a film restraining member interlocked therewith. The winding amount of the film is kept constant.

[Problems to be Solved by the Invention] However, the mechanism itself of the film transport regulating means that regulates the amount of film movement using a film movement regulating member such as a subrocket and a film restraining member interlocked therewith as described above is complicated. It is difficult to incorporate into the camera because it is large and takes up a considerable amount of space. In addition, mechanical time delays are inevitable, and slips also occur, resulting in insufficient stopping accuracy in the case of high-speed winding. Furthermore, there is a possibility that the film may be damaged by the part that is pressed.

Therefore, the purpose of the present invention is to solve the above-mentioned conventional problems, and
To provide a film feeding stop mechanism and a film feeding stopping method that can accurately stop film feeding even when automatically winding and rewinding a film at high speed.

[Means and effects for solving the problem] The film feed stop mechanism of the present invention is pressed against at least one side of the film loaded in the camera, and generates a surface wave on the pressed surface. and a driving means for exciting the surface wave generating means while the film is being fed by the motor and stopping the excitation when the film feeding is stopped. be.

Further, in the method for stopping film feeding of the present invention, a surface wave generating means for generating a surface wave is pressed against at least one side of the film loaded in the camera, and while the film is being fed by the motor, the surface wave generating means is pressed against at least one side of the film loaded in the camera. The present invention is characterized in that a surface wave is generated, and the generation of the surface wave is stopped when the film feeding is stopped.

[Example] The present invention will be explained below with reference to illustrated embodiments.

First, before describing embodiments of the present invention, the basic concept of the present invention will be explained using FIG. 2, and the configuration of the surface wave generator used in the present invention will be explained using FIGS. 3 to 6. .

Figure 2 (A). (B) is a sectional view of the main part of the film feeding stop mechanism for explaining the basic concept of the present invention;
) shows when the film is stopped feeding, and (B) shows when the film is being driven. In the figure, this film feeding stop mechanism is configured so that surface wave generators 1 and 2 press both sides of the film 3, and when winding the film 3, the surface wave generators 1 and 2 press the surface wave generators 1 and 2. When a surface wave is generated by the generator 1.2 and the feeding of the film 3 is stopped, the generation of the surface wave is stopped as shown in FIG. 2(A). The surface wave generator 1 is fixed to the camera body 15, and the surface wave generator 4r 2 is fixed to the fixed plate 2d.
Although it is fixed to the top and is movable in the vertical direction of the figure, it is pressurized from the bottom side of the figure, that is, the opposite side of the film.

When the surface wave generators 1, 2 and the film 3 are in full contact with each other at the time of stop shown in FIG. Even if a traction force is applied from the left side, the product cannot be pulled out due to the large frictional force generated.

On the other hand, when an electrical signal in the ultrasonic range is applied to the surface wave generators 1.2 to generate surface waves, the film 3 becomes unable to follow the vibrations of the surface waves, and at a certain moment the surface wave generators 1, 2
The situation becomes more relaxed. Then, the contact between the surface wave generators 1 and 2 and the film 3 is only for a moment when the driving state shown in FIG. The frictional force between the surface wave generator 1.2 and the surface wave generator 1.2 becomes very small, and the film can be easily pulled out by applying a traction force to the film 3 from the right or left side of the figure.

In Fig. 2, both sides of the film 3 are supported by surface wave generators 1 and 2, but one side, for example, only 1 in the figure is a surface wave generator, and 2 has a contact surface. It can also be constructed from a smooth member, and vice versa.

Next, FIG. 12 shows the basic concept of means different from the stop means in the film feeding stop mechanism described above.

This connects the film 3 with the surface wave generator IA,
2A is the same as in FIG. 2 above, but the difference is that the surface wave generator generates surface waves even when the film is stopped in the same way as when feeding.

That is, when the film is being fed, the two surface waves generated by the surface wave generator are driven so that the phase difference between them becomes zero towards the film, and when the film is stopped, the phase difference becomes 180'. This will be explained in detail in the second embodiment below.

The above is the basic concept of the present invention.

Next, the configuration of the surface wave generator used in the present invention will be explained. Figure 3 (A). (B) is the surface wave generator 1, 2
FIG. The surface wave generator 1 is composed of a felt 1a, a ceramic vibrator 1b, and a metal plate 1c, as shown in FIG. The ceramic vibrator 1b and the metal plate 1c are bonded to each other using an epoxy adhesive or the like. The same applies to the surface wave generator 2, and as shown in FIG. 3(B), it is constructed by bonding a felt 2a, a ceramic vibrator 2b, and a metal plate 2c with an adhesive or the like. A film 3 (not shown) is interposed between the metal plates IC and 2C. These surface wave generators 1 and 2 are bonded and fixed to the camera body 15 and the fixing plate 2d, respectively.

Here, the ceramic vibrators 1b and 2b will be explained.

FIG. 4 is a process diagram briefly explaining the manufacturing process of the ceramic resonator. In the figure, first, as shown in ■, a ceramic cut into a rectangular shape, such as Pb (Zr, IN
) Prepare a material for the emphasis electric body like 03 and bake the electrodes as shown in ■ to create electrodes divided into 6 places on the front surface and electrodes on the entire surface as shown in O on the back side. Form. As shown in Figure 4 ■ and 0, the back electrode is set to ground potential, and the front electrode is
Polarize by applying high voltages with polarities of +, 10, +, 10, and 1. After polarization is completed, conductive paste is applied again to the entire surface as shown in (2).

Metal plates 1c and 2c are attached to the ceramic vibrators 1b and 2b formed by such a manufacturing process, and as shown in FIG. 5(A).
．． When an AC voltage is applied to the electrodes on both sides of the ceramic as shown in (B) and (C), a standing wave is generated on the metal surface depending on the polarity of the applied voltage as shown in Figure 5 (A) or (C).
), but when no AC voltage is applied, no standing waves are generated as shown in (B). Note that the metal plates 1c and 2c may have a comb-like shape as shown in FIG.

The above is the configuration of the surface wave generator.

The present invention, which has such a basic concept and controls film feeding using a surface wave generator, will be explained in more detail by way of examples thereof.

FIG. 1 is a perspective view showing essential parts of a film feeding stop mechanism showing a first embodiment of the present invention. In the figure, when actually incorporating this stopping mechanism into the camera, the surface wave generator 1
, 2 to support the film 3. Here, numeral 4 is a cartridge, 5 is a subur, and 6 is a film pressure plate. The surface wave generators 1 and 2 are arranged so as to press the top and bottom of the film 3, respectively, the surface wave generator 1 is fixed to the camera body (not shown), and the surface wave generator 2 is pressurized from the rear. The film 3 is suppressed and held.

FIG. 7 is a cross-sectional view of the film 3 feeding stop mechanism to show the manner in which the surface wave generator is pressed against the film as described above, and is a plane seen from the line A-A' in FIG. The figure is number 8
It is a diagram. In each figure, this stopping mechanism includes a pressure plate 1 fixed to the camera body (not shown), a pressure plate 6 supported by the rear cover 8 of the camera and crimped to a first leaf spring 9, and a pressure plate 6 fixed to the camera body (not shown). Felt l is attached to the inside of the rail 7 and presses the upper and lower inner surfaces of the film 3.
a. Ceramic vibration complete 1. b, a surface wave generator 1 made of a metal plate IC, a L2 facing the surface wave generator 1, a felt 2a placed in a through hole drilled in the pressure plate 6 with the film 3 sandwiched therebetween, and a ceramic vibrator. 2b, metal plate 2
e, a surface wave generator 2 consisting of a fixed plate 2d, a second leaf spring 10 that supports the surface wave generator 2 so as to be pressed against the film 3 by a mounting pin 13, and this leaf spring 10 as shown in L. It consists of a pin 11 that is fixed to the pressure plate 6, and a first temporary spring 9 that is fixed to the center of the pressure plate 6 with a lock 14 and has both ends fixed to the rear cover 8 of the camera with pins 12. ing. 2. As shown in FIG. 8, the second leaf spring 10 has key-shaped notches 10 provided near both ends thereof.
By fitting a into the bottle 11, it can be attached to the pressure plate 6 and the body, and the first leaf spring 9
It is also removed by fitting into the bottle l2 fixed to the rear cover 8 f =
It is now possible to digit one. When the rear lid 8 is closed, the pressure plate 6 is pressed against the pressure plate rail 7 by the first leaf spring 9.

FIGS. 9 and 10 show an electric signal f in the ultrasonic range applied to the surface wave generator 1.2. This is a quilling diagram showing a block system diagram of an electric circuit and waveforms of each part for generating a physical wave by applying . In the figure, reference numeral 21 denotes an oscillator, which generates an electric signal f in the ultrasonic range as shown in FIG.

It generates an oscillation output signal QO with a frequency 4fo that is four times as large as .

This oscillation output signal QO is sent to the ring counter 2.
The counter output signals Q] to Q4 (Q2 and Q4 are not shown) are converted into counter output signals Q] to Q4 whose decoty ratio obtained by dividing the frequency by 14 is 4.

The counter output signals Q1 to Q4 have a phase of 90'' in order.
Of these signals Q1 to Q4, Q1
and Q3 are input to the bases of l transistors 25 to 28 through AND gates 23 and 24. 1.Ran resistor 25
．． 26, step-up transformer 29 and transistor 27.2
8 and step-up transformer 30 each constitute a push-pull power amplifier (7), and have a high voltage output V 1.
Generates an AC signal of V2. These high voltage outputs V1
, V2 are not sine waves, but there is no particular problem in generating surface waves.

A-on/off control of the surface wave generator is ANDG-1/23.

This is done by controlling the ON/OFF control signal input to 24. When this control signal ON/OFF is "H", the counter output signal Q: t. When ON/OFF is "1", the output of AND gate 1. becomes 0.

The output terminals T t and T 2 of the two step-up transformers are connected to both end electrodes of the ceramic green element 1b of the surface wave generator 1 shown in FIG. 7, and to the output terminal T of the step-up transformer 30.
3. T4 is connected to both end electrodes of the ceramic vibrator 2b of the surface wave generator 2. In the first embodiment with such a configuration, when winding up the Noilm, a winding motor (not shown) is connected. ), and at the same time, set the control signal ON/'σdingding' to "H" and manually input the AND game 23.24.

Then, a standing wave is generated on the surface of the surface wave generator 1.2, so that the effective contact area and contact time between the film 3 and the surface wave generator 1.2 are reduced. First, since the frictional force is reduced and the winding of the film 3 becomes very light, it becomes possible to wind the film at high speed using the winding motor.

The amount of winding is determined by reading the barfo 1 notation of the nose with a photo force plate (not shown).

When the hoisting amount is about to reach the specified amount, the hoisting motor is turned off and at the same time the control signal ON/T is set to "L°".Then, the surface waves of the surface wave generators 1- and 2 disappear. The contact area between the metal plates 1c and 2c of the surface wave generator 1.2 and the film 3 suddenly increases, and the frictional force increases, making the winding of the film extremely heavy, which causes the film to stop immediately. Become.

Next, the response characteristics when stopping the film being fed in the first embodiment constructed and operated as described above will be explained. The electrical time constant of the electrical circuit shown in Figure 9 above is approximately 0.
Therefore, the control signal ON/? The time from when 5TT is set to "L" until the film 3 actually stops depends on the time until the surface wave of the surface wave generator disappears. This time is very small, usually several meters
SeC or less. Now, assuming that this time constant is 2 msec, the amount of film fed from when the film stop 1L signal is output until the film is stopped, that is, the amount of film overrun is determined.

38mm film frame of 35mm wide roll film
(frame interval is 2mm), 200mse when hoisting
If the film is wound at c, the film feeding speed is 0.19
It becomes msec. Therefore, if the speed decreases in proportion to time from 0.19 msec to Omsec within 2 msec after the film stop signal is output, the overrun amount will be 20.002 - [0.19t - 47. 5t].

= 0. ．． 19 x 10-3 [m] or 0.19 mm. Therefore, it is possible to realize a high-precision film feeding stop mechanism with stop precision that is far superior to the conventional film feed stop mechanism.

FIG. 11 is a perspective view showing essential parts of a film feeding stop mechanism showing a second embodiment of the present invention. In the first embodiment, the length of the surface wave generator 1.2 supporting the film 3 in the film running direction is approximately one frame of film, as shown in the figure. In the second embodiment, as shown in FIG. 11, the surface wave generators IA and 2A placed at the upper right and lower right of the exposed surface of the film 12 are made small in size and shaped to hold down a small portion of the film 3. I take it as a thing. In addition, the surface wave generator IA,
2A to generate a surface wave and feed the film 43 is exactly the same as in the first embodiment, but when stopping to stop feeding the film 3,
This embodiment uses different means from the first embodiment. That is, while in the first embodiment the surface waves are not emitted when stopped, in the second embodiment the surface waves are generated by the surface wave generator IA.
, high voltage output v1. applied to two people. The phase difference between the AC signals of v2 is set to 180 degrees, that is, one of the AC signals is inverted, and thereby surface waves having a phase difference of 180'' are generated from the surface wave generators IA and 2A. In the following second embodiment, the same reference numerals are given to the same drawing members as in the first embodiment, and the explanation thereof will be omitted.

Figure 12 (A), (B). (.C) is a surface wave generator IA for explaining the basic concept of this second embodiment.
, 2A and the film 3, in which (A) shows the holding state, (B) the driving state, and (C) the stopped state.

In the figure, when the film is fed, the phase difference between the surface waves output from the surface wave generators IA and 2A becomes zero toward the film surface, as shown in FIG. 12(B). Surface waves are generated as the peaks and valleys face each other. In addition, when stopping, as shown in Fig. 12 (C), the phase difference between the surface waves output from the surface wave generators IA and 2A is 180°, that is, the peaks of the surface wave generator IA and the peaks of the surface waves are generated at the same time. Surface waves are generated so that the valleys of the generator IA, the valleys of the generator IA, and the peaks of the generator 2A face each other.

Furthermore, when the film is held, the generation of surface waves is stopped as shown in FIG. 12(A).

According to such a means, at the time of power failure, the surface wave generator I
Since A and 2A are shaped to pinch the film 3 while biting into it, the frictional force generated on the film 3 is greater than that in the first embodiment, and the film '3 is stopped more quickly and reliably.

In this example, the surface wave generators IA and 2A are placed at the positions shown in Fig. 11, but they may be placed at other positions, such as at the lower left and upper left, or above and below the center of the exposure surface. Of course, it is also possible to arrange two or more.

[Effects of the Invention] As described above, according to the present invention, it is possible to stop the film feeding with high response while not taking up much space. Even if the speed is increased, the mechanism does not become complicated and can be easily controlled.

In addition, since only the top and bottom of the exposed surface of the film are pressed, even if the exposed surface is scratched, the exposed surface remains intact and does not pose any particular problem.

Furthermore, since the frictional force acting between the film and the surface wave generator during driving becomes extremely small, the amount of force required for winding the film is reduced, which improves the winding speed.
Since the winding can be driven at high speed until just before the winding stops, the winding time can be greatly shortened compared to the conventional technology, and many other remarkable effects are exhibited.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts of a film feeding stop mechanism showing a first embodiment of the present invention; FIG. 2(A). (B) is a cross-sectional view of the main part of the film feeding stop mechanism for explaining the basic concept of the present invention. 3(^) and (B) are respective exploded perspective views of the surface wave generators 1 and 2 used in the present invention, and FIG. 4 is the above-mentioned FIG. 3(A). ．． (B) A perspective view showing the order of the manufacturing process of the ceramic resonator; FIG. 5(A). (B)
．． (C) shows the vibration state when AC voltage V1 is applied to the ceramic resonator in FIG. Figure 5 (B) shows the case of V110, and Figure 5 (C) shows the case of v
FIG. 6 is a perspective view showing another modification of the metal plate shown in FIG. 3, and FIG. 7 shows the surface wave generator in FIG. A cross-sectional view of the film feeding stop mechanism showing the manner in which it is pressed against the surface; FIG. 8 is a plan view taken from the plane A-A' in FIG. A block system diagram of an electric circuit for exciting and generating surface waves, FIG. 10 is a timing chart showing the waveforms of each part in FIG. 9, and FIG. 11 is a film showing a second embodiment of the present invention. A perspective view showing the main parts of the feeding stop mechanism, FIG. 12(A). (B) and (C) are the above first
These are cross-sectional views explaining the film feeding state by the surface wave generator in Fig. 1, in which Fig. 12 (^) is when holding, Fig. 12 (B) is when driving, and Fig. 12 (C) is when stopped. FIG. 1, 2......Surface wave generator (surface wave generating means) 3...Films 25 to 28... ...Transistor (driving means) 29.30...Output transformer (driving means)%
1 Ward (A) (B) (A) (B) Le 4 Ward ■One attack 11; 7 Horse 5 Ward Horse 6 Figure Horse 9 Ward Le 7 Figure Dew Nine sides % 8 Figure II Figure μ 12 Ward

Claims (4)

[Claims] (1) A surface wave generating means that is pressed against at least one side of the film loaded in the camera and generates a surface wave on the pressed surface, and a surface wave generating means that generates a surface wave while the film is being fed by a motor. A film feeding stop mechanism characterized by comprising: a drive means that is excited and stops the excitation when stopping the film feeding. (2) a surface wave generating means for sandwiching the film loaded in the camera by pressing it from both sides and generating surface waves on each of the pressing surfaces; a driving means that excites the two surface waves generated by the generating means so that the phase difference becomes zero toward the film, and that the phase difference becomes 180° when the film feeding is stopped; A film feeding stop mechanism characterized by comprising: (3) A surface wave generating means for generating a surface wave is pressed against at least one side of the film loaded in the camera, and a surface wave is generated on the pressed surface while the film is being fed by the motor; A method for stopping film feeding, characterized in that generation of the surface waves is stopped when stopping the film feeding. (4) Surface wave generating means for generating surface waves are pressed into contact with both sides of the film loaded in the camera, and while the film is being fed by the motor, the phase difference between the two surface waves becomes zero toward the film. A method for stopping film feeding, characterized in that the film feeding is excited so that the phase difference becomes 180° when the film feeding is stopped.