JPS5932950B2 - split photography device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a divided photographic device that photographs a plurality of frames of CRT images on a single sheet film.

BACKGROUND OF THE INVENTION Recently, devices have been used in the medical field, etc., for capturing images projected on a television monitor in sections on film. The outline is that a CRT blow-out device that blows up images is placed in a housing that is a dark box, and a lens plate that is equipped with a lens and a shutter at a position (focal length) corresponding to the number of frames required in front of the blow-out device. A sheet film is placed at the focal point of the image passed through this lens plate. Then, by selecting or moving the photographing lens, divided photographs are taken at predetermined positions on the film with the number of divided frames and frame size changed. In split photographs taken with such a photographic device, the spaces between the frames are transparent on the negative film, so when performing image diagnosis on a Chagas film, the light passing through the transparent parts is used for image diagnosis. The drawback was that it got in the way and the photos looked bad. The present invention is a divided photograph in which the periphery of the image is framed in black as shown in FIG. An object of the present invention is to provide a photographing device that facilitates image diagnosis on a Chagas film by using a CRT tube blowing device that can form a black frame on an image on a negative film.

Embodiments of the present invention will be described below with reference to the drawings. Third
The figure shows a front view a and a side view of the CRT tube blowing device.

A mask 2 is provided on the front surface of the CRT tube 1 to prevent the film from being exposed to light from the tube surface except for the area where the image 3 is blown out. Here, the opening width (W) and height (H) of the mask 2 are as follows:
The width W of the image 3 is made larger than the height by the size of the black frame formed on the film. The portion other than the image 3 which blows up on the CRT tube 1 is made into a video signal which is intended to blow up the white level signal. According to a photographing device using such a blowing device, a black frame is formed around each frame image on a negative film, and there is no light transmission from the periphery of the image during image diagnosis on a Chagas film. FIG. 4 is a circuit diagram of a main part for obtaining a video signal having a white level signal in a portion other than the CRT tube blow-out image area.

The video signal given to terminal P1 is transmitted through transistors TR1~
The signal is taken out from terminal P2 through a video signal processing circuit such as TR4. In this circuit, transistor TRI
, TR2 operate as a buffer amplifier circuit, and transistors TR3 and TR4 are in the image signal area when TR3 is on and T
R4 is turned off to allow the video signal to pass through as it is, and TR3 is turned off and TR4 is turned on during times other than the image signal area to forcibly process the video signal into a white level waveform. The on/off control of the transistor TR3 is performed by the terminal P3.
This is done using signals extracted from the vertical and horizontal synchronization signals given to the The synchronizing signal at the terminal P3 is received by the transistor TR5 and given to horizontal period monostable multivibrators (hereinafter referred to as monostable multi) MMl, MM2, and the output of the transistor TR5 is sent to the transistor T having a filter circuit.
It is received by R6 and given to the vertical period monostable multi MM3 and MM4.

The monostable multi-MMl is triggered by the horizontal synchronization signal of the synchronization signals, and its time constant is set to the delay time from the horizontal synchronization signal to the trailing edge of the video signal to be deleted, as shown in Figure 5. Ru. The monostable multi-MM2 is triggered at the trailing edge of MMl and its time constant is set to the time to the part of the leading edge of the video signal to be deleted. Monostable multi MM2
The output of turns off the transistor TR3 through the 0R logic diode D1.

Therefore, the video signal is forcibly controlled to the white level during the period T shown in FIG. As a result, white level projection control is performed in the horizontal direction excluding the image on the CRT tube. Similarly,
Monostable multi MM3 and MM4 are triggered by a vertical synchronization signal, and the white level projection control signal in the vertical direction excluding the image on the CRT tube is passed through the diode D2 to the transistor T.
Give to R3.

Note that in the above embodiment, instead of the mask 2 causing glare outside the white frame of the image, circuit processing may be used to control the area outside the white frame to be projected at a black level. Figure 6 shows the circuit section, and the difference between this figure and Figure 4 is that a transistor TR7 is added in addition to the transistor TR4, and by controlling this transistor TR7 to turn on, the area outside the white frame of the image is projected at a black level. . This transistor TR7 is a monostable multi-MM5
, MM6 turn on the horizontal side, and monostable multi MM7 and MM8 turn on the vertical side. During the on control period, NAND gates Gl and G2 suppress the outputs of monostable multi MM2 and MM4, and transistors TR7 and TR4 turn on. Simultaneous on is prohibited. For example, the operation of each part on the horizontal side is as shown in the time chart shown in FIG. In FIG. 7, the operations of monostable multi MM1 and MM2 with respect to the video signal are the same as those in FIG. The time constant of the monostable multi-MM6 is set to be smaller than the time constant of MM2 by twice the width of the white frame. As a result, the output period T2 of MM6 is taken out at a timing smaller than the width of the white frame on both sides during the output period T of the monostable multi-MM2, and the output of the gate G1 which receives both outputs as input, that is, the transistor TR
3 off-periods T3 are taken out, and the transistor TR4 is turned on only during the off-period T3, so that a white frame of the image is projected. Then, during the output period T2 of the monostable multi-MM6, the transistor TR7 is turned on, and the area outside the white frame of the image is displayed as black. As described above, the divided photographic device according to the present invention is a CRT
By projecting a white level around the image on the tube, a black frame is formed on the image on the negative film, which has the effect of facilitating image diagnosis on the shear cast of divided photographs.

[Brief explanation of the drawing]

1 and 2 are diagrams illustrating divided photographs by the photographing device according to the present invention, FIG. 3 is a diagram showing the image projection state of the CRT tube projection device according to the present invention, and FIG. 4 is a diagram illustrating the image projection state according to the present invention. A video signal control circuit diagram, FIG. 5 is a waveform diagram for explaining the operation of FIG. 4, FIG. 6 is a video signal control circuit diagram showing another embodiment of the present invention, and FIG. It is a time chart of a circuit diagram. 1...CRT tube, 2...mask, 3.
...Image, MMl~MM2...Monostable multivibrator.

Claims (1)

[Claims] 1. In a segmented photography device that divides the image projected on a CRT tube into multiple frames on a single sheet of negative film and shoots the image, a band-shaped white level signal is projected around the image projected on the CRT tube. A divided photographic device comprising a CRT tube projection device and forming a black frame on an image on a negative film.