JPH03273228A - Camera provided with data imprinting function - Google Patents

Abstract

PURPOSE:To prevent a camera from being made large by detecting a film position signal by means of an LED phototransistor set on a back cover side. CONSTITUTION:The infrared ray reflection type LED phototransistors 12-16 are set on the back cover side where the film presser 11 contacts with the film. By winding the film, the perforation of the film is moved and the film reaches the upper part of the LED phototransistor 12. As soon as the film reaches the upper part, an infrared rays emitted from an LED are reflected on the film and received by the phototransistor, which outputs the signal. Since the position of the perforation 18 of the film coincides with the upper part of the LED phototransistor 13, at such a time, the film moves while it fits the position of the LED phototransistor and the film perforation or deviates therefrom, so that timing is detected as the film position signal. Thus, it is needless to provide a film moving position detecting part on a camera main body side.

Description

[Detailed Description of the Invention] The present invention provides data such as date/time or shooting location (
The present invention relates to a method for detecting a film position signal of a camera with a data imprinting function, which imprints data (hereinafter abbreviated as data) onto a photosensitive film (hereinafter abbreviated as film) in response to the film winding operation.

Advances in electronics technology have provided cameras with various useful additional functions.

One of these functions is the ability to superimpose data on images of landscapes and people, and is particularly useful for family records and travel photos.

FIG. 4 is a conceptual diagram of position detection of film movement by a rotary encoder of a conventional camera with a data imprinting function, showing the film of the conventional camera and the camera body. In the figure, l denotes a film, on which a photographic image of a landscape or the like is recorded from the front, and at the same time, data is temporarily stored in accordance with the timing of the shutter 2. -The stored data is stored when the film is moved to 1st position by the film winding operation of the film lever 4.
Move pieces. Then, the single-digit LED lights up sequentially to make an impression each time the film is moved. The timing of the light emission of this LED is determined by the amount of movement of the film 1.

Rotary encoder 5 is directly connected to sprocket 6. A photographer winds up the film 1 using the film winding lever 4 after taking a picture. By this operation, the film winding gear 7 interlocked with the sprocket 6 on the sprocket 6 engages with the perforation 8 of the film 1, thereby moving the film 1 one frame. With this operation, the rotary encoder 5 connected to the sprocket 6 rotates at the same time as the sprocket 6. In other words, the film 1 rotates by the amount that it moves one frame. In general, the sprocket 6 rotates once when the film 1 moves one frame. For this reason, the rotary encoder 5 is designed to have the resolution of imprinted characters in one rotation. As a result, several film position signals are obtained by setting the rotary encoder 5.

Figure 3 is a conceptual diagram of film movement position detection using a microswitch in a conventional camera with data imprinting function, showing the conventional detection part, and an enlarged partial view of the film position detection mechanism attached to the sprocket. It is a diagram. In the figure, 7 is a film winding gear that interlocks with the sprocket. Reference numeral 9 denotes a film position detection lever, which is interlocked with the microswitch 10. The shutter is pressed and the film is wound I! When the mechanism operates, the sprocket that moves synchronously rotates, and the sprocket 7 rotates and meshes with the gears of the sprocket. The film perforations move and the film is wound. At this time, the film position detection lever 9 is engaged with the sprocket 7 and is pushed up each time the sprocket rotates, thereby interlocking with the film position detection lever 9. This causes the microswitch 10 to generate a film position signal.

As described above, conventional cameras with a data imprinting function use a rotary encoder method or a microswitch method for detecting the position of film movement, but both have drawbacks.

First of all, the rotary encoder has the following drawbacks. The first problem is the shape.

Some rotary encoders use an LED phototransistor as an internal structure and have a resolution valve slit between them, and others have a resolution valve contact that is detected by contact with a brush, but all types of rotary encoders have different shapes. It gets bigger. This large rotary encoder is extended and connected to the bottom of the sprocket, and is rotated to detect film position signals, resulting in a large bottom of the camera body.

Also, since a rotary encoder must be attached to the camera body, the camera body must be significantly redesigned. - Data imprint function for boat fishing The camera's data imprint function is located on the back of the camera. It is not preferable to install parts for data imprinting on the camera body side in order to detect film position signals.

It goes without saying that it would be better to have the data imprint function only on the back cover, and the cost of the rotary encoder is extremely high due to its structure, making it unsuitable for cameras with a data imprint function aimed at low prices. This has hindered the spread of this type of camera with a data imprinting function.

Next, the disadvantages of the micro-sinch method are as follows. Unlike detection using a rotary encoder, there is no need to set up detection parts on the camera body side, and all detection parts can be installed on the back cover side. Also, the shape is not very large. But it's not reliable. The higher the resolution of a microswitch, the more chattering will occur. As a result, film position signal detection is unreliable due to chattering. Also, since it is a mechanical inch, it is not durable.

As described above, conventional film position detection methods include the rotary encoder method and the microswitch method, but in both cases, these detection methods have drawbacks.

The present invention has focused on this point and has developed an LED that is installed on the back cover side to solve this drawback of film position signal detection in conventional cameras.
This problem was solved by detecting film position signals using phototransistors.

The perforations of the film are used to detect the position of film movement, and the position signal necessary for imprinting data is detected using an infrared LED and a phototransistor.

FIG. 1 is a structural diagram of the back cover of the camera according to the present invention. or,
FIG. 2 is a diagram showing the relationship between the LED phototransistor and the perforations of the film. The main difference between the present invention and conventional film position signals is that an infrared reflective LED phototransistor is installed on the film presser 11 of the back cover on the side facing the film.

The LED phototransistor 12, the LED phototransistor 13, the LED phototransistor 14, the LED phototransistor 15, and the LED phototransistor 16 are reflective types that emit infrared light.

A pair of LED and phototransistor are built into one package. The infrared light emitted from the LED is reflected by an object that can reflect it and returns. The phototransistor receives this light and detects that there is an object in front of it. When the infrared light emitted from the LED hits the film, the film reflects the infrared light. The present invention uses this principle.

When a photographer takes a picture and records data, he or she first points the camera at the subject and presses the shutter, and the data at this time is temporarily stored. Next, data is imprinted when the film is wound by the film winding lever.

Film position signal detection immediately after shooting is as follows. The LED phototransistor 12 is initially aligned with the perforation 17.

As a result, infrared rays emitted from the LED are not reflected because there is no film on top. Therefore, the phototransistor does not receive light and the LED phototransistor 12 does not output a signal. Next, since the LED phototransistor 13 is not aligned with any perforation, the infrared light emitted from the LED hits the film and is reflected. Therefore, the phototransistor receives light and outputs a signal. The LED phototransistor 14 is an LED phototransistor 15.
Similarly to the LED phototransistor 13, the LED phototransistor 16 also outputs a signal because it has a film on top. In this way, when detecting a film position signal immediately after photographing, only the LED phototransistor 12 does not output a signal, and all the remaining LED phototransistors output signals.

This is the film position signal condition before winding.

Next, the film is wound up by the film winding lever, and the film gradually moves. In other words, the perforations of the film move. Then, a film comes to the top of the LED photophorangister 12. As soon as it reaches the top, the infrared rays emitted from the LED are reflected by the film. The phototransistor receives the light and outputs a signal. At this time, the upper part of the LED photophorangistor 13 is aligned with the perforation 18 of the film. Therefore, no position signal is output from the LED phototransistor 13. In this way, the film moves while aligning and misaligning the LED phototransistor and the film perforations. This tying is detected as a film position signal.

Five LED phototransistors are installed on the back cover, and eight perforations move with each roll of film.

This makes it possible to detect 40 film position signals.

This results in the following advantages:

Since there is no need to provide a position detector for film movement on the camera body side, imprinting can be done using only the back cover. For this reason, the camera body does not need to be made large.

Furthermore, since detection is performed by the movement of the film, the exact amount of movement of the film can be detected and there is no error at all. The structure is very simple and the reliability is very good.

The cost is low and it can also be used for data imprinting on low-priced cameras such as automatic cameras, helping to popularize cameras with data imprinting functions.

In the present invention, five LED phototransistors are installed on the back cover film holder, but the present invention is not limited thereto. If you increase the number of units installed, the number of film position signals per film winding will increase and the resolution will further increase. Needless to say, if the number of installations is reduced, the number of film position signals will be reduced.

Further, the LED phototransistor is a type in which an LED and a phototransistor are built bare in one element, but the present invention is not limited thereto. Even if the LED and phototransistor are separate elements, they may be set so that they can emit light and receive light.

Although the film movement position is detected at the time of film winding, the present invention is not limited thereto, and the film movement position may be detected in synchronization with the film unwinding.

As described above, the film movement position can be detected using the LED phototransistor built into the back cover.

This reduces the cost of the data imprinting function, improves the precision of film movement position detection, and reduces the size of the film, and the effects are extremely significant.

[Brief explanation of drawings]

FIG. 1 is a structural diagram of the back cover of the camera of the present invention. FIG. 2 is a diagram showing the relationship between the LED phototransistor and the perforations of the film. FIG. 3 is a conceptual diagram of film movement position detection using a microswitch in a conventional camera with a data imprint function. FIG. 4 is a conceptual diagram of position detection of film movement using a rotary encoder of a conventional camera with a data imprinting function. 1... Film 2... Shutter 4... Film winding lever 5... Rotary encoder 6... Sprocket 7... Film winding gear 8... Perforation 9... Film position detection lever 10 ... Micro switch 11 ... Film presser 12 ... LED phototransistor 3 ... LED phototransistor 4 ... LED phototransistor 5 ... LED phototransistor 6 ... LED phototransistor 7 ... Perforation 8... Perforation 9... Perforation 0... Perforation... More than perforation

Claims (1)

[Claims] In a camera with data imprinting that imprints data in synchronization with film winding or rewinding, a light-emitting element and a light-emitting element are provided on the same side of the film, facing the perforation hole, and the film is moved while the film is being moved. The apparatus further comprises a position detection means for detecting a moving position of the film based on a difference in reflectance of the film and outputting a position signal necessary for data imprinting, and also for setting the pair of the light emitting element and the light emitting element to have a phase different from that of the perforation hole. A camera with data imprinting function.