JP2856194B2 - Camera film movement detection device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which data such as date / time or photographing location (hereinafter abbreviated as "data") is recorded on a photographic photosensitive film (hereinafter abbreviated as "film"). The present invention relates to a film movement detection device for a camera having a data imprint function for performing data imprint in response to a winding operation. 2. Description of the Related Art Advances in electronics technology have provided cameras with various useful additional functions.
The function of superimposing data on the image of a landscape or a person and printing the data is one of them, and is a particularly useful function in home records and travel photographs. FIG. 4 is a conceptual view of film position detection by a rotary encoder of a conventional camera having a data imprinting function, and shows a film and a camera body of the conventional camera. In FIG. 1, reference numeral 1 denotes a film. On the film 1, a photographic image such as a landscape is recorded from the front, and data is temporarily stored at the timing of the shutter 2. The temporarily stored data moves the film one frame by the film winding operation of the film lever 4. Then, the one-digit LED sequentially emits light and performs imprinting every time the film moves. And the light emission timing of this LED is film 1
Is determined by the amount of movement. [0004] The rotary encoder 5 is directly connected to the sprocket 6. The photographer winds up the film 1 by the film winding lever 4 after shooting. By this operation, the film winding gear 7 associated with the sprocket 6 in the sprocket 6 engages with the perforation 8 of the film 1 to move the film 1 by one frame. By this operation, the rotary encoder 5 connected to the sprocket 6 rotates together with the sprocket 6. In other words, the film 1 is rotated by the amount of one movement. In general, the rotation of the sprocket 6 is one rotation per one frame movement of the film 1. For this reason, the rotary encoder 5 is provided with the resolution of the character to be imprinted in one rotation. As a result, several film position signals are obtained by setting the rotary encoder 5. FIG. 3 is a conceptual diagram showing the detection of the position of the film movement by the micro switch of the conventional camera having a data imprinting function, and shows a conventional detection portion.
FIG. 4 is a partially enlarged view of a film position detecting mechanism attached to a sprocket. In the figure, reference numeral 7 denotes a film winding gear that works with the sprocket. Reference numeral 9 denotes a film position detection lever, which is linked with the micro switch 10. The sprocket which rotates in synchronization with the operation of the film winding mechanism when the shutter is pressed is linked with the film winding gear 7. The film winding gear 7 is engaged with the perforation of the film 1. Thus, the perforations of the film move and the film is wound up. At this time, the film position detecting lever 9 is engaged with the film winding gear 7, and is pushed up every time the sprocket rotates. As a result, a film position signal is generated in the microswitch 10. As described above, the conventional cameras with a data imprinting function have a drawback in that there are a rotary encoder system and a micro switch system for detecting the position of the film movement. First, there are the following disadvantages of the rotary encoder. The first is the shape problem.
Some rotary encoders use an LED phototransistor as an internal structure, with a slit for resolution provided between them, and others have contacts for the resolution to detect by contact with a brush, but any type of rotary encoder has a large shape. Would. Since the rotary encoder having this large shape is extended and connected to the lower side of the sprocket and rotated to detect the position signal of the film, the lower side of the camera body becomes large. Also, since the rotary encoder must be attached to the camera body, the camera body must be redesigned. Generally, the body of the data imprinting function of a camera with a data imprinting function is located on the back cover side of the camera. It is not preferable to install a component for imprinting data on the camera body for detecting the position signal of the film. Needless to say, it is better to have the printing function only on the back cover side. In addition, the cost is extremely high due to the structure of the rotary encoder, which is not suitable for a camera with a data imprinting function aiming at a low price. This has hindered the spread of this type of camera with a data imprinting function. Next, the disadvantages of the microswitch system are as follows. Unlike the detection by a rotary encoder, there is no need to set detection parts on the camera body side, and all the detection parts on the back lid can be installed. Also, the shape is not so large. But not reliable. Chattering occurs as the resolution of the microswitch is increased. As a result, the detection of the position signal of the film is not reliable due to chattering. In addition, there is no durability due to the mechanical switch. As described above, the conventional film position detection methods include the rotary encoder method and the microswitch method, but in any case, the detection method has a disadvantage. Focusing on this point, the present invention is constructed by detecting the film position signal by using an LED phototransistor set on the back cover side of such a disadvantage of the conventional camera film position signal detection. The position of the film movement is detected by utilizing the perforation of the film to detect a position signal necessary for imprinting data with an infrared LED phototransistor. A film movement detecting device according to the present invention is a film movement detecting device for a camera for detecting an instantaneous moving position of a film unwound with a film winding operation. Perforation formed on film
The perforation hole is located on the movement path of the perforation hole.
Are arranged side by side at a different pitch from the
The perforation that moves with the winding operation
Multiple hole detection to detect holes at different timings
Output means and the detection results of the plurality of hole detection means.
The film associated with the film winding operation in one frame.
The position of the lum is determined by the number of perforation holes.
And a film position detecting means for dividing and detecting the film position.
It is characterized by having . According to this configuration, it is possible to detect a position corresponding to the number of the hole detecting means in the moving distance between the adjacent perforation holes. That is, in one-frame feed of the film, it is possible to detect the instantaneous moving position of the film by dividing the film into a number equal to or more than the number of perforation holes. Preferably, the arrangement pitch of the plurality of hole detecting means is shorter than the arrangement pitch of the perforation holes. According to this configuration, a plurality of hole detecting means can be collectively arranged. When the number of the hole detection means is n, the arrangement pitch of the hole detection means is shifted by 1 / n phase of the arrangement pitch of the perforation holes.
preferable. According to this configuration, it is possible to detect each moving position equally divided by the number of hole detecting means between adjacent perforation holes. That is, assuming that the number of perforation holes for one frame of film is m, it is possible to detect the instantaneous movement position of the film equally divided into nxm with respect to one film advance. FIG. 1 is a structural view of a back cover of a camera according to the present invention. FIG. 2 is a diagram showing the relationship between the LED phototransistor and the perforation of the film. The most different point of the present invention from the conventional film position signal detection is that an infrared reflective LED phototransistor is provided on the film contact surface side of the film holder 11 of the back cover. LED phototransistor 12, LED phototransistor 13, LED phototransistor 1
4. The LED phototransistor 15 and the LED phototransistor 16 are of a reflection type that emits infrared light. An LED and a phototransistor are incorporated in one package in a pair. Infrared light emitted from the LED is reflected back to an object that can reflect it. The phototransistor receives the light and detects that there is an object ahead.
When infrared light emitted from the LED hits the film, the film reflects the infrared light. The present invention uses this principle. When photographing and imprinting data, the photographer first points the camera at the subject and presses the shutter. The data at this time is temporarily stored. Next, when the film is wound by the film winding lever, data is imprinted. The detection of the film position signal immediately after photographing is as follows. The LED phototransistor 12 is initially aligned with the perforation 17. Thereby, the infrared light emitted from the LED is not reflected because the film is not on the upper part. Therefore, the phototransistor does not receive light and L
The ED phototransistor 12 does not output a signal. Next, since the LED phototransistor 13 has no position with respect to any of the perforations, an infrared point emitted from the LED is reflected on the film. Therefore, the phototransistor receives light and outputs a signal. The LED phototransistor 14 is an LED phototransistor 15, an LED
The phototransistor 16 is also the LED phototransistor 1
As in the case of 3, the signal is output because the film is on the upper part. As described above, the detection of the film position signal immediately after shooting is L
All the LED phototransistors that do not output a signal only the ED phototransistor 12 output a signal. 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. That is, the perforation of the film moves. Then next is LED
A film comes over the phototransistor 12. The infrared light emitted from the LED as soon as it reaches the top is reflected by the film. The phototransistor receives the light and outputs a signal. At this time, the upper part of the LED phototransistor 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 the LED phototransistor and the film perforation are aligned or shifted. This timing is detected as a film position signal. L
Five ED phototransistors are provided on the back cover, and one perforation moves eight perforations. As a result, 40 film position signals can be detected. In the present invention, LE is used for the back cover film holder.
Although five D phototransistors are provided, the present invention is not limited to this. If the number of installations is increased, the film position signal for one winding of the film will increase and the resolution will increase. It goes without saying that reducing the number of installations reduces the film position signal. The LED phototransistor is L for one element.
This is a type in which the ED and the phototransistor are built in a pair, but the present invention is not limited to this. What is necessary is just to set so that light emission and light reception can be performed even if the LED and the phototransistor 13 are separate elements. This has the following advantages. Since there is no need to provide a film movement position detection unit on the camera body side, imprinting can be performed only with the back cover. Therefore, the size of the camera body is not increased. Also, the movement of the film every moment,
A plurality of hole detection means
Error can be detected by arranging the switches
Is not. And the structure is very simple and the reliability is very good. The cost can be reduced, and it can be used for imprinting data on low-cost cameras such as auto cameras, which is useful for the spread of cameras with a data imprinting function.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural diagram of a back cover of a camera according to the present invention. FIG. 2 is a diagram showing a relationship between LED phototransistors and film perforations. FIG. 3 is a conceptual diagram of detecting a film movement position by a micro switch of a conventional camera having a data imprinting function. FIG. 4 is a conceptual diagram of position detection of film movement by a rotary encoder of a conventional camera having a data imprinting function. [Description of Signs] 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 holder 12 LED phototransistor 13 LED phototransistor 14 LED phototransistor 15 LED Phototransistor 16 LED phototransistor 17 Perforation 18 Perforation 19 Perforation 20 Perforation 21 Perforation

Claims (1)

(57) [Claims] A film movement detecting device of the camera for detecting constantly moving position of the unwound with on the film winding operation film, the moving path of the perforation hole formed in the film
An arrangement pitch different from the arrangement pitch of the perforation holes
Switches are arranged side by side with the film
The perforation holes to move
A plurality of hole detecting means for detecting at a timing and one frame based on a detection result of the plurality of hole detecting means.
Of the film with the film winding operation
Is divided into more than the number of perforation holes
Film position detecting means for detecting
Film movement detecting device of the camera according to symptoms. 2. The apparatus according to claim 1, wherein an arrangement pitch of the plurality of hole detection means is shorter than an arrangement pitch of the perforation holes. 3. 2. The camera according to claim 1, wherein when the number of the hole detecting means is n, the arrangement pitch of the hole detecting means is shifted by 1 / n phase of the arrangement pitch of the perforation holes. Film movement detection device.