JPH05188467A - Data imprinting device for camera - Google Patents

Abstract

PURPOSE:To accurately imprint data with simple constitution. CONSTITUTION:Brush noise pulse generated by the rotation of a DC brush motor 2 for winding film is shaped in terms of waveform by an AC amplifier 5 and a comparator 6, and counted by a counter 7. At the time of attaining a specified counted value, a control circuit 10 judges that the data imprinting position of the film reaches the arranged position of LED arrays 9a-9g, and outputs an LED array driving signal synchronizing with the frequency-divided pulses inputted from the counter 7 to a driving control circuit 11, and LED arrays 9a-9g are selectively operated to imprint the data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data imprinting device for a camera.

[0002]

2. Description of the Related Art Conventionally, a data imprinting device for a camera, which automatically imprints a date on a film every time a photograph is taken, rotates a disc in association with a rotary shaft of a motor for feeding a film and is provided on the disc. The slits formed are detected and the number of the slits is counted to find the position of the film. When the film screen reaches a predetermined position, the date data is imprinted on the film in synchronism with the film feed.

As a concrete method of detecting the slit, a method of using a photo interrupter or the like has been generally used.

[0004]

In the one in which the slit is detected by the photo interrupter or the like to obtain the position of the film and the data is imprinted, since the photo interrupter or the like is used, the number of parts is large and the cost is high.
Further, since the shape of the photo interrupter is not small, there is a problem that it is difficult to obtain a storage space in a microminiature camera.

An object of the present invention is to provide a data imprinting device for a camera which can accurately imprint data with a simple structure.

[0006]

According to the present invention, a film is formed according to a count value of a counting means for counting a pulse train obtained by waveform shaping brush noise generated by rotating a DC brush motor for winding the film. The above-mentioned object is achieved by providing a data copying means for copying desired data.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on an embodiment shown in the drawings.

In FIG. 1, reference numeral 1 denotes a motor bridge circuit, which is a DC brush motor 2 for feeding a film,
It is composed of transistors 3 to 3 and controls the bidirectional rotation of the DC brush motor 2. Reference numeral 4 is a resistor for detecting brush noise generated by the rotation of the DC brush motor 2. Reference numeral 5 is an AC amplifier, and 6 is a comparator, which shapes the waveform of brush noise generated by the rotation of the DC brush motor 2. Reference numeral 7 is a counter for counting brush noise, which is composed of a variable frequency divider. Reference numeral 8 is a battery which is a power source. Reference numeral 9 denotes an LED array which constitutes data imprinting means. In this example, seven LED (light emitting diode) arrays 9a to 9g are arranged linearly at right angles to the moving direction of the film 21 as shown in FIG. . A control circuit 10 is composed of a CPU, a ROM, a RAM, etc., detects a predetermined movement amount of the film from the count value of the counter 7, controls the operations of the LED arrays 9a to 9g, and controls various operations. .. A drive control circuit 11 selectively operates the LED arrays 9a to 9g according to an input signal from the control circuit 10. An information input unit 12 includes a keyboard, switches and the like, and inputs data such as the number of films to the control circuit 10. A clock circuit 13 measures the date and the current time.

Next, the operation will be described with reference to FIG.

When the photographing is completed, the RO in the control circuit 10
According to the sequence program stored in M, the control circuit 10 controls the desired transistor 3 in the motor bridge circuit 1.
~ 3 are operated to rotate the DC brush motor 2 to start film winding.

At this time, a motor drive current as shown in FIG. 3A flows through the resistor 4.

This motor drive current is amplified only by the AC component by the AC amplifier 5 as shown in FIG. 3 (b).

The signal amplified by the AC amplifier 5 is waveform-shaped by the comparator 6 as shown in FIG. 3 (c), and this output is input to the counter 7.

The counter 7 has its count value cleared in advance, counts the pulses to be input, and the counter shown in FIG.
As shown in, the input pulse is divided appropriately (in this example, 1
Divide to / 4. ) Output to the control circuit 10.

The frequency division ratio of the counter 7 determines the drive timing of the LED arrays 9a to 9f and is designated by the control circuit 10.

The control circuit 10 counts the output pulse from the counter 7, and when the count value reaches a desired count value, the control circuit 10 determines that the film data recording position has reached the arrangement position of the LED arrays 9a to 9g, and the counter 7 The LED array drive signal synchronized with the frequency-divided pulse input from is output to the drive control circuit 11.

This drive signal is output based on the date data from the clock circuit 13.

The drive control circuit 11 selectively drives the LED arrays 9a to 9g in response to an input signal from the control circuit 10 to print date data on a film.

For example, when "8" is imprinted on the film, the LED arrays 9a to 9g are selectively operated in synchronization with the output of the counter 7 as shown in FIG. Imprint.

In this way, the date is automatically imprinted on the basis of the date data.

Further, during panoramic photography, the division ratio of the counter 7 is reduced to reduce the size of characters to be printed.

In the above embodiment, the LED array 9 is used.
Although an example in which a to 9 g are turned on at the same time is shown, a maximum of 7 dots of current flows into the load when they are turned on at the same time, which increases the load on the power supply. Can be slightly shifted as shown in FIG. 4 so that the current load does not increase at one time.

Further, as shown in FIG. 5, LED arrays 9a-9
It is also possible to arrange g so as to be slightly inclined with respect to the film feed direction A at a right angle and to sequentially shift the lighting timing of each of the LEDs 9a to 9g in this order.

In this case, the inclination of the characters to be printed can be eliminated by appropriately adjusting the inclination angle of the LED and the lighting timing.

Further, considering the size of the LEDs, the LEDs may be arranged in a staggered pattern instead of one line.

The extinguishing timing of the LED may be in accordance with the output of the counter 7, and the extinguishing timing is stored in advance in the ROM in the control circuit 10 and the control circuit 10 measures the time signal from the clock circuit 13. It may be turned off.

The data to be imprinted on the film is not limited to the date and may be the time or message.

[0028]

According to the present invention, the desired data is imprinted on the film according to the count value of the brush noise generated by the rotation of the DC brush motor for winding the film, so that the data can be imprinted accurately. it can.

Since a photo interrupter for detecting the position of the film can be omitted, the structure can be downsized.

Moreover, when a photo interrupter is used, malfunctions will occur if dust or the like adheres to the detection section. However, if the position of the film is electrically detected as in the present invention, there is no such concern, and high reliability can be obtained. Be done.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory view of a main part of FIG.

FIG. 3 is a timing chart for explaining the operation of FIG.

FIG. 4 is a timing chart for explaining the operation of FIG.

5 is an explanatory view of a main part of FIG.

[Explanation of symbols]

 2 DC brush motor 7 Counting means 9 Data imprinting means

Claims (1)

[Claims] 1. A camera for winding a film for each photographing, including a DC brush motor for winding a film, and a counting means for counting a pulse train obtained by waveform shaping brush noise generated by rotation of the DC brush motor. A data imprinting device for a camera, comprising: a data imprinting unit imprinting desired data on a film according to the count value of the counting unit.