JPS595236A - Synchronizing device for automatic photographing - Google Patents

Abstract

PURPOSE:To enable the photographing of the image having the same aspect ratio as the aspect ratio of an actual photographing object by detecting the moving speed of an object just before the photographing position and synchronizing the scanning of a photographing medium therewith. CONSTITUTION:A titled device is so constituted as to synchronize automatically the scanning of a photographing medium with the moving speed of an object with a photographing device for photographing a moving object such as a slit camera, a line sensor camera or the like, wherein the video from the lens 2 of a slit camera 1 passes through a half mirror 3 and further through the slit window 5 of a slit plate 4 and is imaged on a film 6. On the other hand, the video reflected by the mirror 3 is imaged on line sensors 9, 10 which are disposed equidistantly from the film plane. A control device 11 receives the outputs from the sensors 9, 10, detects the moving speed between A-B just before the photographing position of a object 12 and feeds the film 6 in an arrow (a) direction at the speed synchronized with said moving speed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic photographing synchronization device for photographing apparatuses such as slit cameras and line sensor cameras.

In photographing devices that photograph moving objects, such as slit cameras and line sensor cameras, images are taken from a direction perpendicular to the direction of movement of the moving object, but in the case of a slit camera,
The film must be fed in the direction of movement of the image projected onto the film surface, which is the photographic medium, at a speed that is synchronized with the image. Similarly, in a line sensor camera, the timing of image reception and scanning of the sensor, which is the imaging medium, must be synchronized. If the image is not synchronized with the moving speed, the captured image will have a different aspect ratio from the actual image.

Therefore, in order to determine the scanning speed or scan timing of the photographic medium, the moving speed of the object must first be known accurately, but even if the moving speed is known, the moving speed of the image cannot be calculated from the shooting distance and the focal length of the lens used. There must be. Conventionally, this has relied on the experience and intuition of the photographer, and images with aspect ratios that are different from the actual images are often photographed.

SUMMARY OF THE INVENTION Therefore, the present invention provides an automatic photographing synchronization device that detects the moving speed of an object to be photographed immediately before the photographing position and synchronizes the scanning of the photographic medium with this speed.

An embodiment of the present invention will be described below based on the drawings. 1st
In the figure, an image from a lens 2 of a slit camera 1 passes through a half mirror 3, further passes through a slit window 5 of a slit plate 4, and is imaged onto a film 6. film 6
is sent in the direction of arrow α by sprocket 7°8.

On the other hand, the image reflected by the half mirror 3 forms an image on line sensors 9 and 10, which are arranged at the same distance as the film surface. Reference numeral 11 denotes a control device which receives outputs from line sensors 9 and 10, detects the moving speed of the object 12 between A and B, and feeds the film 6 at a speed synchronized with this.

An example of the control device 11 is shown in FIG. 2, in which 16 is a line sensor scanning circuit, 14.15 is an amplifier circuit, 16.17 is a waveform shaping circuit, and 18 is a time detection circuit. Waveform shaping circuit 1 from the rise of the output of circuit 16
Detect the time until the output of No. 7 rises. 19 is a time-voltage conversion circuit that converts this time into a driving voltage for the motor 20. 21 is a rotational speed detection circuit of the motor 20; 22
2 is a speed-voltage conversion circuit, and 23 is a voltage comparison circuit. 2
Reference numeral 4 denotes a drive voltage control circuit which controls the voltage from the conversion circuit 19 using the output of the voltage comparison circuit 23 to generate a drive voltage for the motor 20. 25 is a switching circuit, and 26 is a passage detection circuit, which produces an output after a certain period of time has elapsed after the object to be photographed passes through point B.

Next, the operation will be explained. When the object 12 to be photographed comes to point A in FIG.

The line sensors 9 and 10 are scanned at regular intervals T by the output of the line sensor scanning circuit 13 shown in FIG.
When the object 12 to be photographed reaches point A, the line sensor 9 generates the output shown in FIG. 3 (I) and the amplifier circuit 14 shown in FIG.
The signal is supplied to the waveform shaping circuit 16 via. A pulse Pa shown in FIG. 3(m) is generated from the waveform shaping circuit 16 and is supplied to the time detection circuit 18.

When the photographing target 12 reaches point B, the line sensor 10
The output shown in FIG. 3 (II) is generated from the waveform shaping circuit 17, and the pulse pb shown in FIG. 3 (IV) is generated from the waveform shaping circuit 17. An output terminal 18α of the time detection circuit 18 generates a counting output of the time t from the rising edge of the pulse P& to the rising edge of the pulse pb. This count output has a value corresponding to the moving speed of the photographing object 12, and this is converted by the conversion circuit 19 to the motor 2.
It is converted to a driving voltage of 0. Since the motor 20 is not rotating yet, the drive voltage is directly generated from the drive voltage control circuit 24 by the output of the voltage comparison circuit 23 and supplied to the switching circuit 25. The switching circuit 25 is turned on from the rise of the pulse pb by the output from the time detection circuit 18 shown in FIG. 3 (Vl). Therefore, the motor 20 is driven by the drive voltage, and the film 6 is scanned by the wheel train mechanism 27. Even if the drive voltage of the motor 20 is constant, the rotational speed of the motor 20 changes depending on the load, that is, the amount of film 6 remaining. Therefore, the detection circuit 21 detects this rotational speed, the conversion circuit 22 converts it into a voltage, and the voltage comparison circuit 23 converts it into a voltage.
Compare with the voltage from 9. Based on this comparison result, the drive voltage from the drive voltage control circuit 24 is controlled, and the
The film 6 is scanned at a constant speed synchronized with the moving speed of 2.

Therefore, when the object 12 reaches the zero point in FIG. 1, the image is formed on the film 6 through the slit 5.
Shooting is performed continuously. Then, in order to stop the film advance with a certain amount of time after the image finishes passing through the slit 5, a certain period of time after the output from the line sensor 10 disappears (for example, when the object to be photographed moves from point A to point B). After the time t) required for this has elapsed, an output is generated from the passage detection circuit 26, the time detection circuit 18 is reset, and the photographing is completed. However, this margin time is not limited to t, but may be set arbitrarily, and it may be stopped by operating a manual switch.

Although the above example uses a slit camera, the present invention can be similarly applied to, for example, a line sensor camera. In this case, the interval from one scan to the next scan of the imaging line sensor may be synchronized with the moving speed of the imaging target.

As described above, according to the present invention, the scanning of the photographic medium is automatically synchronized with the moving speed of the photographic subject, so that images with the same aspect ratio as the actual photographic subject can be produced without any manual effort. Can be photographed.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a block diagram showing an example of a circuit configuration, and FIG. 3 is a time chart for explaining the operation. 1...Slit camera 6...Half mirror 6...Photography medium 9.10...Line sensor 11...Control device 12... ...More than the subject of photography Applicant Seikodai Co., Ltd. Agent Patent attorney Tsutomu Mogami

Claims (1)

[Claims] In a photographing device that photographs a moving object such as a slit camera or a line sensor camera, there is a detection device that detects the moving speed of the photographic object just before it reaches the photographing position, and an output of this detection device that controls the scanning of the photographic medium by the output of the detection device. An automatic photographing synchronization device equipped with a control device that synchronizes the movement speed.