JPH01182836A - Film residual detector - Google Patents

Abstract

PURPOSE:To detect the remaining film without contacting the film by providing plural light emitting elements which emit light to the outside peripheral surface of the film wound around one reel in a prescribed direction and detecting the reflected light reflected on the outside peripheral surface of the film, which receives the emitted light, at an angle corresponding to the winding diameter of the film. CONSTITUTION:An LED array 20 consisting of plural light emitting elements which emit light to the outside peripheral surface of a microfilm F wound around a supply reel 1 in a prescribed direction and a detecting means 10 which detects the reflected light, which is reflected on the outside peripheral surface of the film F at an angle corresponding to the winding diameter of the film, of the light from the LED array 20 are provided in proper positions. Consequently, the light is reflected at the angle corresponding to the winding diameter of the film, and the detecting means 10 detects the reflected light from the outside peripheral surface of the film to send a film remainder signal. Thus, the remaining film is detected without directly applying a force on the microfilm F.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a film remaining amount detection device that optically detects the remaining amount of a roll-shaped microfilm.

(Prior Art) Conventionally, in order to measure the remaining amount of a roll-shaped microfilm, a mechanical measuring means as shown in FIG. 15, for example, has been employed. Such a conventional example is microfilm 10.
An arm 102 that rotates around a fulcrum 101 is placed on the outer circumference of 0.
A pinion 104 provided at the other end of the arm 102 whose one end is biased by the action of a spring 103 and rotates according to the winding diameter r of the film 100 is connected to a gear 106 of a variable resistance 105.
is configured to rotate and generate an output signal according to the winding diameter r.

(Problems to be Solved by the Invention) However, in such a conventional example, since the arm 102 is configured to directly contact the outer peripheral surface of the film 100, not only is there a risk of damaging the surface of the film 100, but also the arm 102 and A problem has arisen in that the winding and rewinding operations of the film 100 become unstable due to friction with the film 100.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art.The purpose of the present invention is to use optical means to eliminate the risk of film damage and to avoid adverse effects on film winding and rewinding operations. It is an object of the present invention to simplify the configuration of a film remaining amount detection device that does not give rise to problems, and to provide it at low cost.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an apparatus for winding a film wound on one reel using the other reel. A plurality of light emitting elements emit light from a predetermined direction to the outer circumferential surface of the film wound around the film, and the reflected light reflected from the outer circumferential surface of the film at an angle corresponding to the film winding diameter is detected. Detecting means.

(Function) In the present invention having the above configuration, when a plurality of light emitting elements emit light from a predetermined direction toward the outer peripheral surface of a film wound on a reel, this light is directed at an angle corresponding to the film winding diameter. reflected. The detection means detects reflected light from the outer peripheral surface of the film and sends out a film remaining amount signal.

(Example) The present invention will be explained below based on the illustrated example. Fourth
The figure is a configuration diagram showing a microfilm reader to which the first embodiment of the film remaining amount detection device according to the present invention is applied. In the figure, 1 is a supply reel as one reel, and 2 is a supply reel as the other reel. It is a take-up reel, and the microfilm F wound on the supply reel 1 is transferred to the take-up reel 2.
The microfilm F wound on the take-up reel 2 can be rewound by the rotational drive of the supply reel l. This microfilm F is illuminated with its image frames by a light source lamp 4 through a condenser lens 3, and the light transmitted through the film at this time is projected onto a screen 6 through an imaging lens 5.

In this embodiment, in addition to the above configuration, an LED array 20 made up of a plurality of light emitting elements and a A detection means for detecting reflected light reflected from the outer peripheral surface of the film F at an angle corresponding to the film winding diameter is provided at an appropriate position.

Next, the operation of detecting the remaining amount of microfilm F on the supply reel l, that is, the winding diameter, in this embodiment will be explained based on the block diagram of FIG. In the figure, l is a supply reel, F is a microfilm wound on the supply reel l, and 10 is a photodiode 11. An amplifier circuit 12 for signal amplification, a light amount detection circuit as the detection means constituted by a lens 13, etc., and 20 an LED array constituted by a plurality of light emitting elements. 21 is a drive circuit for the LED array 20, and 23 is a control circuit, which sends an LED array drive signal LS to the LED array drive circuit 21, and also sends a display signal OS to the display circuit 24 based on the output signal C5 from the light amount detection circuit 10. Send out.

In the above configuration, the photodiode 11 serving as the light amount detection means is installed at a position that can detect the amount of light from a predetermined direction with respect to the outer peripheral surface of the film F, and the LED array 2
0 facing the outer peripheral surface of the film F, and installed so that the light generated from the LED array 20 is reflected on the film surface F and detected by the photodiode 11, and the amount of incident light at that time is output from the light amount detection circuit 10. . That is, as shown in the part of the microfilm F in FIG. 1, for example, when the film winding diameter is fa, the photodiode 11
The angle of the incident light ray to the normal to the film surface is LPa
This is the light emitted at position Pa on the LED array 20.

When the film winding diameter becomes fb, which is smaller than fa, the angle of the light beam incident on the photodiode 11 with respect to the normal to the film surface becomes large, 'Pb', which is
6 above 0! This is light emitted by tPb.

Therefore, if each light emitting element on the LED array 20 is made to emit light from one side one by one or in plural at regular intervals, the light emitting element will start emitting light by 1 when the winding diameter of the film F is fa.
= 0, the output voltage signal CS from the light amount detection circuit 10 reaches its maximum peak at time ta as shown in FIG. It reaches its peak. Here, the control circuit 23 determines the time (for example, the above-mentioned time ta) until the output voltage signal C5 from the light amount detection circuit 10 reaches its maximum peak.
, tb) to the display circuit 2.
Send to 4. In addition to displaying the remaining amount of film F on the display section 24a, this display circuit 24 can also have an alarm function such as a buzzer to notify when the remaining amount of film is small. moreover,
It can also be provided with a function of stopping film winding depending on the amount of film remaining.

FIG. 3 shows an example of the operation control of this embodiment having the above configuration. That is, the control circuit 23 first outputs a reset signal to the LED array drive circuit 21.
p■), outputs the LED light emission signal LS (Step
■) Next, the time data t until the output signal C3 of the light amount detection circuit lO reaches its peak, and its maximum value data j#
Set the maximum value data vsax of aX+ peak voltage to 0 (S step ■), add 1 to t (S step @)
, input the value of the signal C5 to the potential data V (S t
ep ■).

If V*ax>V, proceed directly to Step■, and V@
If ax > v, enter t in t@a and V in v wax and move from (Step ■) to Step ■ (
When all reading is completed in Step ■) and 5 step ■, display signal O8 should be output to the display circuit.
■), If NO at 5 step ■, return to step ■. At step 5@, if tIaX is larger than the time data t END corresponding to the end of 74 lums, film end processing is performed (StepQl)); if it is smaller, S t
Return to ep ■.

According to the above configuration, the remaining amount of film can be detected without applying force directly to the microfilm F.
Based on this detection result, functions such as displaying the remaining amount of film, an alarm function, and stopping feeding by detecting the end of the film can be provided. Therefore, there is no risk of damaging the film when detecting the remaining amount of film, and there is no risk of hindering film feeding.

FIG. 5 shows a second embodiment of the present invention, and the same components as those of the first embodiment shown in FIG. 1 are given the same reference numerals. A single (7) LED is used as a light emitting means for irradiating the film F.
30a, 30b.

The configuration in which 30c and 30d are arranged at predetermined intervals in the circumferential direction of the reel 1 is different from that of the first embodiment. In this case, LEDs 30a, 30b, 30c.

30d is directly connected to the control circuit 23 without going through the LED array drive circuit. An example of the operation control of the second embodiment having this configuration is shown in FIG.

That is, the control circuit 23 first causes the LED 30 a to emit light (Step ■), and inputs the output signal C5 from the light amount detection circuit IO at this time to the potential data Va (Step ■).
), and turn off the LED 30a (Step ○)
, similarly LEDs 30b and 30c.

30d respectively, and potential data Vb + VC*
Input Vd (Step ■ to Step ■).

Potential data input so far va I vl)
, We, and vd, calculate the remaining amount of film from the potential data that has the maximum value, and change the display circuit 2 accordingly.
Output the display signal OS to 4 (S tap @),
If the potential data Va reaches the maximum value in Step ■, film end processing (Step ■) is performed, and if it is any other value, the process returns to 5tepO.

Although the second embodiment cannot continuously detect the amount of film remaining as in the first embodiment, it is easier and cheaper to detect the film than the one using an LED array and drive circuit. The remaining amount can be detected. Note that the configuration and operation other than those described above are the same as those of the first embodiment, so their explanation will be omitted.

Note that in the second embodiment, the LED 30a is used.

We have described the case where 30b, 30c, and 30d are arranged at equal intervals, but as shown in Figure 7, when the film winding diameter is large, the LED interval is set small, and when the film winding diameter is small, the LED interval is set large. By doing so, it is possible to correct the difference in the amount of change in the reel diameter for winding a unit length of film. By doing so, the remaining amount of the film F can be measured not by the winding diameter but by the length of the film F.

Furthermore, in the second embodiment, the LEDs 30a, 30
b, 30c, and 30d are set at equal distances from the film surface fl when the film winding diameter is maximum,
As shown in FIG. 8, LEDs 30a, 30b, 30
Film surfaces fI and f2 that detect c and 30d, respectively
.

Further, in the first and second embodiments described above, the case where an LED is used as the light emitting element has been described, but a light emitting element such as a light bulb may also be used.

Moreover, FIG. 9 shows a case in which film breakage occurs in the embodiment shown in FIG. 8 and the film end fe is rotated in the direction of the arrow, and FIG. In the example, the case where film winding disorder occurs and the winding diameter becomes elliptical is shown. In this case, under normal conditions, one potential data is gradual as shown in FIG.

However, when the abnormality mentioned above occurs, the data changes as shown in Figure 12 or Figure 13, for example.
The maximum value Δv wax of the change in potential data is calculated from sampling data of film speed or reel rotation speed, etc., and functions such as abnormality display and equipment stop are provided by determining conditions as shown in the flowchart shown in Fig. 14. You can also do that.

(Effects of the Invention) The present invention has the above-described configuration and operation, and since the remaining amount of film can be detected without having a contact part to the film, there is no risk of damaging the film. Since no force is applied to the reel, stable rotation of the reel can be maintained, thereby reducing the possibility that the film will be undone. Also,
Since a plurality of light emitting elements are used to emit light to the outer circumferential surface of the film, the structure is simplified and can be provided at low cost.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a first embodiment of the film remaining amount detection device according to the present invention, Fig. 2 (a) and (b) are output waveform diagrams of the light amount detection circuit of the same embodiment, and Fig. 3 is a flowchart showing the operation of the same embodiment, FIG. 4 is a block diagram of a microfilm reader to which the same embodiment is applied, FIG. 5 is a block diagram showing a second embodiment of the present invention, and FIG. 6 is a block diagram of the same embodiment. FIG. 7 is a block diagram showing a modification of the same embodiment, FIG. 8 is a block diagram showing another modification of the same embodiment, and FIGS. Explanatory diagrams for the case of breakage and film winding disorder; Figures 11 to 13 are output waveform diagrams for normal and abnormal conditions in Figure 9 or Figure 10, respectively; Figure 14 is the output waveform diagram for abnormality; A flowchart showing the operation for detecting an abnormality in the example shown in FIG. 1 or FIG. 10, and FIG. 15 is a configuration diagram of a conventional example. Explanation of symbols l... Supply reel (one reel) 2... Take-up reel (other reel) lO... Light amount detection circuit (detection means) 20... LED array (multiple light emitting elements) F ...Microfilm (film) Figure 3 Figure 4 Figure 7 Figure 1 and Figure 8 Figure 9 Figure 10 Figure 11 Figure 12

Claims (3)

[Claims] (1) In a device for winding a film wound on one reel using the other reel, a plurality of light emitting elements emit light from a predetermined direction to the outer peripheral surface of the film wound on the one reel; What is claimed is: 1. A film remaining amount detection device comprising a detection means for detecting reflected light reflected from the outer peripheral surface of the film at an angle corresponding to the film winding diameter. (2) A plurality of light emitting elements that emit light from the predetermined direction,
2. The remaining film amount detecting device according to claim 1, wherein the remaining film amount detecting device is arranged in the circumferential direction of the one reel. (3) The film remaining amount detection device according to claim 1 or 2, wherein the plurality of light emitting elements are constituted by an LED array.