JPS5974537A - Data writing device for camera - Google Patents

Abstract

PURPOSE:To make the whole of a camera small in size and light in weight, by providing one-digit components of LED array closely to a film running face and driving this LED carry synchronously with movement of a film to write the year, the month, the day, the time, etc. of photographing successively. CONSTITUTION:One-digit components of LED array 2 consisting of, for example, 7 segments is are provided at the rear of the running face of a film 1 closely to this face, and a position detector 6 which detects the position of a frame on a basis of the extent of movement of the film 1 is provided near a take-up spool 5 of the film 1. The signal outputted from the position detector 6 is sent to a driving circuit (LSI) 3, and the LED array 2 is lit intermittently in accordance with the extent of movement of the film 1 on a basis of this signal at the winding time while changing the display. Thus, the year, the month, the day, the time, etc. are written optically successively in prescribed positions of one frame of a photographed image.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera using film as an imaging medium.
-1 In particular, the present invention relates to a data writing device for a camera, which is capable of writing data such as a shooting date on film.

Conventionally, in film-loading type cameras, it was possible to optically write the shooting date, time, etc. on each frame of film taken, and to automatically imprint the date on the developed photograph. A camera is provided.

A conventional photographing date writing device has a structure as shown in FIG. 1, for example. A segment display type light emitting diode array (hereinafter referred to as LED array) 2 is arranged along the back surface of the film 1 loaded into the camera body, and the L8I3, which has a built-in clock function, detects when the shutter switch 40 is turned on. The LED array 2 was turned on and the numbers 5 indicating the year, month, day, and time at that time were optically written on the film 1.

However, in the conventional camera date writing device as shown in FIG. 1, an LFJD array having a plurality of digits is used to display the year, month, day, and time at the same time. As a result, the year, month, day, and time when the shutter switch 4 was turned on were written on the film at the same time. Therefore, in conventional camera date writing devices, the LED array 2 has a large number of digits. The disadvantage is that the size of the LSI 3 including the array 2 and the Drino'τ circuit that drives it becomes large, resulting in an increase in the size of the entire camera.

This invention was made by paying attention to the above-mentioned problem, and the film is close to the film running surface by 1 digit σ)LE'X)
By providing only an array, driving it in synchronization with the movement of the film, and writing the year, month, day, time, etc. of the photograph in order so that it appears in the rows, the LED array and the circuit that drives it ( The aim is to make the entire camera compact and lightweight.

A further object of the present invention is to enable arbitrary photographic data other than the photographing date to be written on the film.

The present invention will be explained below using the drawings.

FIG. 2 shows a schematic configuration of a camera data writing device according to the present invention.

In this embodiment, a one-digit LED array 2 consisting of seven segments is arranged close to the rear of the running surface of the film 10, although this is particularly limited.

Further, a position detector 6 is provided near the take-up spool 5σ) of the film 1 for detecting the position of the frame from the amount of movement of the film 1. The position detector 6 may be a contact switch that comes into contact with a protrusion formed on the take-up spool 5 of the film 1 and is turned on and off as the film 1 rotates, or a contact switch along the side edge of the film 1. A sensor that optically detects the formed slit may be used.

Based on the signal output from the position detector 6, L18I3 lights up intermittently while changing the display of the ``'cl'' gD array 2 in accordance with the amount of movement of the film 1 when the film is wound. , the year, month, day, time, etc. at the time of photographing are optically written one after another at a predetermined position of each frame of the photographed image on the film 1.

A camera to which the above writing device is applied may have a manual film winding mechanism or an automatic film winding mechanism using a motor.

In the case of an automatic winding type camera, instead of providing the position detector 6, the array 2 may be illuminated in synchronization with the rotation of the motor using an electric signal from the motor.

Next, FIG. 3 shows an embodiment of a drive circuit for lighting the LED array 2. As shown in FIG. The part surrounded by chain line A in the figure is L
This is a circuit that will be integrated.

The reference signal outputted from the excavation circuit 11 equipped with the crystal oscillator 11a is supplied to the frequency dividing circuit 12 and frequency-divided to 1/360 Hz. The frequency dividing circuit 12 sends a °C pulse signal to the hour counter 13 every hour to increment the clock by one. When the hour counter 13 counts up to 24, a signal is sent to the day counter 14 and the day counter 14 counts up. Similarly, numeral 15 is a month counter which is incremented every month, and numeral 16 is a year counter which is incremented every year.

These counters 13 to 16 are set to a desired value (current time) at power-on, etc. by a time setting circuit 18 that is operated by operating a cross switch group 17 provided outside the LSI 3. It is possible to fix it.

Next, 19 is a storage circuit for storing the values of the counters 13 to 16, and 20 is a control circuit.

The control circuit 20 is manually supplied with a signal from the shutter switch 4, and when the shutter switch 4 is turned on, the values of the counters 13 to 16 at that time are introduced into the storage circuit 19 and stored. . This prevents erroneous data from being written due to the time difference between photographing and film winding.

A signal relating to the position of the film is also input to the control circuit 20 by a signal reading circuit 21 which reads the signal from the position detector 6, performs appropriate waveform shaping, and forms a single signal. The control circuit 20 selects the selection circuit 2 based on the signal regarding the position when winding the film.
2 is operated to supply data such as time held in the memory circuit 19 to the decoder 23 in order for each C1 digit in accordance with the position of the frame on the film.

The data such as time sent to the decoder 23 is here l,
F3 It is converted into a signal that lights up the numbers in the 7 segments of D array 2. The output signal of the decoder 23 is supplied to a driver 24 which is controlled by the control circuit 20, and the driver 24 supplies an appropriate applied voltage to the segment electrode terminals of the LEL array 2. , ”(, data such as time is lit up one digit at a time. The lit digits are projected onto a predetermined position on the image of the film.

Therefore, "0", according to the data glutinous device of this embodiment,
LBD array 2 that projects data (numbers) onto the film
Even if the number is only one digit, the number indicating the data is projected onto the moving film in sequence with a time difference based on the signal from the position detector 6, so You can write all the data to .

Moreover, in the circuit of the embodiment, the correspondence between each digit of the LED array and data etc. is not determined in advance as in the conventional case.
It is possible to write arbitrary photographic data other than time, such as shutter speed and aperture, on the film.

In addition, in the above embodiment or at the time of photographing, the valley counter 13
A memory circuit 19 is provided for storing values of 16 to 16 degrees Celsius, but this memory circuit 19 is indispensable.

is not necessary either. For example, in an automatic winding camera in which winding is performed by a motor immediately after shooting, the time difference between shooting and winding is small, so the memory circuit 19 is omitted and the CM circuit 22 directly stores the counters 13 to 13. 16 to the decoder 23 in order.

By providing a minute counter and a second counter in addition to the counters 13 to 16, time data can be written in units of minutes and seconds.

In the above embodiment, since data is written while the film is moving, the lighting time of the LgD array 20 is set to be as short as possible within the range that provides enough light to expose the film 1. There is. A lens may be inserted between the film 1 and the LED array 2 to project the image in degrees Celsius.

Furthermore, in automatic winding type cameras, an intermittent drive mechanism such as a Geneva gear is provided to provide instantaneous winding of the film.
By configuring the LF3D array 2 to turn on in synchronization with the I stop, it is possible to write data more clearly.

Further, in the circuit of the embodiment, an LED array is used as a light projecting means that is projected onto a film to form a luteator, but it is not limited to kneading. For example, a light projection means for data writing can be configured by a transmissive liquid crystal display device and a light source placed behind it.

Furthermore, the light emitting means is not a segment display type,
By using a matrix display type LED array or the like, it is possible to display not only numbers but also simple characters and symbols, thereby making it possible to write a wide variety of data onto the film.

It is also possible to provide a key manual device in the camera body so that information such as the photographer, the shooting location, etc. can be written on the film.

As explained above, in the data writing device for a camera according to the present invention, the number of digits of the light emitting means and the LED array at the other end is small, so the area occupied by the driver circuit and decoder circuit that drives it is reduced. Smaller driving LSI
The chip size is reduced, the number of LSI bins is also reduced, and the 0 package is made smaller. the result,
The entire camera incorporating these devices can also be configured compactly and inexpensively. Furthermore, since the number of digits of data that can be displayed is not so limited as in the past, it is now possible to write shooting data other than the shooting date on the film, improving camera functionality. effective.

[Brief explanation of the drawing]

FIG. 1 is a perspective explanatory view showing a schematic configuration of a conventional camera date writing device, FIG. 2 is a perspective explanatory view showing a schematic configuration of a camera data writing device according to the present invention, and FIG. FIG. 2 is a circuit configuration diagram showing an example. DESCRIPTION OF SYMBOLS 1... Film, 2... Light projecting means (LEI) array), 3... Drive circuit (LSI), 4... Shutter switch, 6... Position detector. Figure 2

Claims (1)

[Claims] 1. In a camera that moves the film loaded in the camera body in one direction and photographs the subject one frame at a time, a nine-character one-digit number is installed close to the film running surface. data consisting of nine arbitrary numbers or symbols, comprising a light projecting means capable of optically projecting a symbol onto the film, and a control means for driving the light projecting means in synchronization with the movement of the film. A data writing device for a camera, characterized in that it is capable of sequentially optically writing on a portion of a moving film.