JPS5836119Y2 - Scanning electron microscope imaging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photographing device for a scanning electron microscope, and more particularly to a photographing device that can prevent double exposure caused by forgetting to wind up a film.

The photographing device of a scanning electron microscope consists of a cathode ray tube for displaying a scanned image and a camera for taking a scanned image.

Cameras that use roll film or Polaroid film are generally manufactured in specialized fields, and are used in scanning electron microscope imaging devices. ing.

Among these, when a camera using roll film is used, it is necessary to wind the film every time one screen is photographed.

Cameras that use roll film generally have only a film winding mechanism and no shutter mechanism.

This is because sweeping and blanking of the cathode ray tube of the imaging device is performed on the scanning electron microscope side, and the presence or absence of brightness of this cathode ray tube can be used as a shutter.

Furthermore, even when a mechanical shutter is provided, it is convenient if the shutter drive is electrically operated in conjunction with the sweeping and blanking of the imaging device, so the shutter is separated from the camera and pre-installed on the cathode ray tube side. .

Therefore, it is very difficult to mechanically interlock the film winding mechanism and shutter mechanism of a camera, so conventionally they are used without interlocking.

For this reason, the number of times the film has been wound must be memorized, and if this memory is incorrect, double exposure or non-exposure may occur.

The purpose of the present invention is to prevent such double exposure and non-photographing states of the photographing device.

An embodiment of the present invention is shown in FIGS. 1 and 2.

FIG. 1 shows a camera that uses roll film, and the roll film is wound by a film take-up lever 2. As shown in FIG.

A small piece of permanent magnet 3 is attached to the film take-up lever 3.

On the other hand, a Hall element 5 is mounted on the camera body 1 using a leaf spring 4.
is attached, and is placed in a position opposite to the Hall element 5 when the permanent magnet 3 attached to the film take-up lever 2 is in the state where the film take-up lever 2 is fully wound.

At this time, if a current is passed through the Hall element 5, a magnetic field is detected, so that the approach of the magnet 3 can be detected and the winding of the film can be detected by the lever 2.

The detection signal from the Hall element is amplified by an amplifier 7 and sent to a level detection circuit 8.

The level detection circuit outputs an output signal when the lever 2 is wound and the magnet 3 approaches the Hall element 5 and the detection signal reaches a predetermined magnitude, and the output signal is input to the set input of the flip-flop circuit 9. is input.

A one-screen scanning end signal from the scanning signal generating circuit 10 is input to the reset input of the flip-flop circuit 9, and the output of the flip-flop circuit 9 is input to the scanning stop input of the scanning signal generating circuit 10, as well as to the blanking circuit. 11
is also entered.

Now, when the film take-up lever 2 is wound, the detection signal from the Hall element 5 increases, and an output signal is output from the level detection circuit 8, setting the flip-flop and turning the scanning signal generation circuit 10 into a scanning ready state. Release the blanking circuit.

When a photographing start switch (not shown) is turned on in this state, the scanning signal generating circuit 10 starts scanning.

At this time, since the blanking circuit 11 is released, a brightness change related to information from the sample appears on the cathode ray tube 14, and an image of the sample is photographed on the film.

When the scanning of one screen is completed, the scanning returns to the original position, and at the same time, the one screen scanning end signal is input to the reset input of the flip-flop circuit 9, and the circuit 9 is reset.

Therefore, at the same time that the scanning signal generating circuit 10 receives the stop signal, the blanking circuit 11 also outputs a blanking output.

Next, when the shooting start switch is turned on without winding the film take-up lever 2, the flip-flop circuit 9 is still in the reset state, so scanning will not start, and the cathode ray tube 14 will be in the blanking state and the brightness will not appear. Therefore, it is possible to easily check whether the film has been wound, and double exposure can be prevented.

Although the case where a Hall element is used as the detection element has been described above, a magnetoresistive element may also be used, or a photoelectric element, a microswitch, etc. may also be used.

[Brief explanation of drawings]

FIG. 1 shows a structural diagram of the present invention, and FIG. 2 shows an example of the circuit. 1: Camera body, 2: Film take-up lever, 3: Permanent magnet, 4: Leaf spring, 5: Hall element, 7: Amplifier, 8 Two-level detection circuit, 9: Flip-flop circuit, 10: Scanning signal generation circuit, 11 Nib Ranking circuit, 12: Deflection current amplification circuit, 13: Deflection coil, 14: CRT.

Claims (1)

[Scope of utility model registration request] In a scanning electron microscope photographing device comprising a display cathode ray tube and a camera having a film winding mechanism and disposed opposite to the cathode ray tube, means for detecting a winding operation of the film winding mechanism; A photographing apparatus comprising: a blanking circuit for bringing the cathode ray tube into a blanking state; and an output signal from the detecting means releases the blanking state by the blanking circuit.