JPS6014259Y2 - Photography equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a photographing device that projects a draft placed on a document placement surface onto a photoreceptor.

Conventionally, in this type of photographing device, the original to be photographed is placed at the photographing position on the document mounting table, the photographing switch is activated to open the shutter on the optical path, and the image of the original illuminated by the illumination source is projected onto the photoreceptor. I try to take pictures of the originals using the camera.

In such a photographic device, the document is placed in the photographing position on the document table, and before the photographic switch is operated, photographing is temporarily interrupted due to an errand such as receiving a telephone call, and then the photographing is resumed after the errand is completed. When photographing, you may forget whether or not you have photographed the draft that is currently in the photographing position, and end up re-photographing the disaster that you have already photographed, wasting consumables or photographing. I had a problem with forgetting things.

The present invention provides an imaging device that solves the above problems.

The photographing device of the present invention can be applied to copying machines such as cameras and electrophotographic copying devices.

The present invention will be explained below with reference to the drawings.

Figure 1 shows a flat-bed camera to which the present invention is applied.
Reference numeral 1 denotes a camera that accommodates a film, 2 an illumination source, 3 an original platen for placing an original, 4 a photographing switch, and 5 an index for positioning the original at a predetermined position on the original platen 3.

A detector 6 detects the presence or absence of an original, and generates a detection signal when an original is placed at a predetermined position on the original placing table 3.

The document detector 6 has a photodetector element 7 made of a phototransistor, and the photodetector 7 faces a hole 8 provided in the center of the document placement surface 3' of the document placement table as shown in FIG. When the document is not placed on the placement surface 3', the light from the illumination source 2 is received, and when the document is placed on the placement surface, the light from the illumination source 2 is blocked by the document. Therefore, it does not receive light from the illumination source and generates a detection signal.

Figure 3 shows the control circuit of the camera, R1, R
2 and R3 are resistors, 10 is a transistor, and 11 is a differential circuit, which consists of a capacitor 12 and a resistor R5.

13 is a buffer element, 14 is a flip-flop, 15 is an inverter, 16 is a display lamp, 17 is a shutter drive circuit, and 18 is a shutter of the camera 1.

The photographing switch 4 is a microswitch and is normally in an off state, but is turned on when the switch is operated to take a photograph.

The operation of the above device will be explained with reference to the timing chart of FIG.

In Fig. 4, waveforms a to g are the third waveforms with the same sign.
It shows the output for each point in the figure.

First, when you turn on the power switch, illumination source 2 lights up.
The camera becomes ready to take pictures.

Next, when the original to be photographed is placed at the predetermined position on the original platen 3 at the time shown in Fig. 4, the incident light to the phototransistor 7 is blocked by the original (waveform a in Fig. 4), and the transistor 10 is turned on. The capacitor 12 is charged (waveform e in Figure 4).

When the capacitor 12 starts charging, a pulse signal d' shown in the waveform d in FIG. 4 is generated from the output terminal of the buffer element 13, and the flip-flop 14 is set by this pulse signal (waveform e in FIG. 4).

The lamp 16 is turned on by the set output signal of the flip-flop 14 via the inverter 15 (waveform f in FIG. 4).

Therefore, when a document is placed on the document placement surface, the lamp 16 lights up.

The lighting state of the lamp 16 is displayed on the display section 16' in FIG.

Next, when the photographing switch 4 is turned on at a certain time, the shutter 18 is activated via the shutter drive circuit 17.
is activated, and the document on the document placement surface is photographed on film within the camera 1.

On the other hand, when the photographing switch 4 is turned on, the flip-flop 14 is reset (waveform e in FIG. 4), and the lamp 16 is turned off.

Therefore, if you use camera 1 to take a picture of a document placed on the document placement surface, the lamp 16 will turn off, so even if you temporarily leave the camera for another task immediately after placing a large manuscript on the document placement surface, After completing an errand, the lamp 16 can be used to confirm whether or not the document placed on the document table has been photographed, preventing the user from accidentally photographing the same document twice or forgetting to photograph it. Mistakes can be prevented.

As the document detector, various known ones can be employed in addition to the one in the above embodiment.

In the above embodiment, only one display lamp is provided, but a plurality of display lamps may be provided, and the blinking state of this display lamp is changed depending on the presence or absence of a document and whether or not the photographing switch is operated. You can do it like this.

For example, the first lamp is turned on when a document is placed on the document placement surface, the second lamp is turned on when the document is photographed, and the first and second lamps are turned off when the photographed document is removed.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a flatbed camera showing an embodiment of the device of the present invention, Fig. 2 is a sectional view of a document detector, Fig. 3 is a diagram showing a control circuit, and Fig. 4 is a diagram showing a timing chart. It is. 1...Camera, 2...Illumination source, 3...
...Document placement table, 6...Document detector.

Claims (1)

[Scope of utility model registration request] In an apparatus for projecting an original placed on an original placing surface onto a photoconductor, means for detecting the presence or absence of an original placing surface, means for displaying that said detecting means has detected an original, and said detection means A photographing apparatus comprising means for changing the display state of the display means when the document detected by the means is projected onto a photoreceptor.