JPS60224376A - Picture recording device - Google Patents

Abstract

PURPOSE:To prevent glittering at the time of observation by framing a part or whole part outside of effective extent of a picture by black painting in recording of a medical diagnostic apparatus etc. CONSTITUTION:Outside of effective extent of the picture is framed by black painting. Digital picture data from a frame memory are D/A converted and inputted to one side of an analog multiplexer 12. A resistance 13 for framing density setting is connected to another side. As a change-over signal CS is connected to an output switching terminal of the multiplexer 12, an analog signal (light beam brightness modulation signal) switched by the multiplexer 12 is inputted to a driver 14 for light modulating element and drives light converting element.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable, for example, to XCT (X-ray tomography) and NMR (nuclear magnetic resonance) in the medical field.

The present invention relates to an image recording device that records an output image of an ultrasonic tomography device or the like on a recording sheet.

Conventionally, for image recording in medical diagnostic equipment using XCT, NMR1 ultrasound, etc., the output CRT image is passed through an optical system onto a recording sheet such as a silver halide film, as shown in Figure 1. , multi-format cameras that split and record multiple screens are often used. Generally, transmitted light from a Scherkasten is used to observe this recorded image, but the area outside the effective screen other than the recording screen is white, making it difficult to observe due to glare and causing eye fatigue. be.

In order to eliminate the above-mentioned drawbacks, an object of the present invention is to eliminate glare during observation by framing part or all of the area outside the effective range of the image in black, and to reduce the brightness of observation light such as shaky stains. The purpose of the present invention is to provide an image recording device that allows observation to be made easily even when the camera speed is increased, and that can widen the dynamic range of the film. , comprising means for compositing an image signal with a preset framing signal, and using the means to black out a specified range of the recording sheet along the periphery of the effective range of the image. It is.

The present invention will be described in detail below based on the illustrated embodiments.

FIG. 2 is a configuration diagram of a general image recording device, in which a laser beam emitted from a laser oscillator 1 passes through a light modulation element 2 such as an acousto-optic device and is guided to a rotating polyhedral image 3 by an optical system. . Also, the reflected light from the rotated polyhedral image 3 is f
- The image is projected and scanned onto the film F on the drum 5 via the θ lens 4. Note that the beam detection circuit 6 generates a synchronizing signal using the main scanning light, and the position of the film F is detected by the film detector 7.

For image recording, a laser beam emitted from a laser oscillator 1 is modulated by an image signal by a light modulation element 2, and a rotating polygonal image 3 is used to main scan the film F in the axial direction of the drum 5, and for sub-scanning, the drum 5 is rotated. It is done by doing this.

In Figure 3(a), all areas outside the effective range of the image are painted black4
This is a divided image, and the shaded area is the black frame.
, blank areas are recorded images. Here, the horizontal arrow pointing from left to right indicates the main scanning direction (X direction), and the vertical arrow pointing from top to bottom indicates the sub scanning direction (Y direction). When making this frame, A, B, C, D, H
It is divided into five types of areas, areas B and D and area A.
, C, and E have exactly the same pattern.

FIG. 3(b) shows the light beam brightness modulation signal for each region when framing is performed. The first pulse shown at the left end is a modulation pulse for detection by the beam detection circuit 6, and N1 indicates the time from the time of beam detection to the start of framing, that is, the pulse portion of the reference clock. ing. N2 is the width of the frame, and similarly N3, N
5 and N7 are the frame widths of each area, and N4 and N8 are the image recording widths. L is the width from the time of beam detection to the final position of effective scanning including framing. Also, Figure 3(C) is A
The width of each region of −H in the sub-scanning direction (Y direction) is shown as old to M5.

FIG. 4 shows a circuit for synthesizing the framing signal and the image signal. Digital image data from a frame memory (not shown) is input to a D/A converter 11 via a data bus 1o. The analog output of the D/A converter 4Q device 11 is connected to one input of an analog multi-flexor 12, and the other input of this analog multi-flexor 12 is connected to a resistor 13 for setting the framing density. There is. Also,
A switching signal cs from a central control section (not shown) is connected to an output switching terminal of the analog multi-flexure sensor 12. The analog signal switched by the analog multi-flexor 12, ie, the light beam intensity modulation signal, is connected to the light modulation element driver 14, and its output drives the light modulation element 2.

FIG. 5 shows a circuit for controlling the timing of framing. When the film F is set at a specified position on the writing drum 5, a writing start signal wS is input from the central control section. This signal ws causes the JK flip-flop 2 to
The Ql output of 1 becomes high level in synchronization with the reference clock pulse CP, and this Ql output
Connected to one input of 2. Two person Kaand Gate 22
The output BS of the beam detection circuit 6 for synchronizing writing is connected to the other input of the . Therefore, when the Ql output of the JK flip-flop 21 becomes high level and the beam detection signal BS is input next, a pulse is given to the J input of the JK flip-flop 23, and its output Q
2 is connected to the count enable input EN of the X address counter 24 in the main scanning direction, and starts counting from this point. Note that the X address counter 24 is previously set as a counter of length L shown in FIG. 3(b) by the central control unit via the data bus 25.

Similarly, the Y address counter 26 is also set as a counter with a length of (10 M2+N3+N4+N5) as shown in FIG. 3(C).

The output of the X address counter 24 is connected to an X digital comparator 28 via an X address bus 27.

3(b), (
The comparison level is set to the old value N1 shown in cj. When the X address counter 24 reaches the value of N1, the X digital comparator 28 sends a match signal to the central controller.
Send P. When the central control section receives this signal, it sends a switching signal to the analog multi-flexor 12 shown in FIG. 4, and framing is started. At the same time, the central control unit rewrites the comparison level of the X digital comparator 28 to (Nl + N2) via the data bus 25. Next, when the X address counter 24 advances (N1+N2) = L,
The timeout output TO of the X address counter 24 becomes high level, the JK flip-flop 23 is reset, and the counting operation ends. At the same time, the contents of the X address counter 24 are cleared to prepare for writing the next line.

In addition, the timeout output TO of the X address counter 24
sets the count enable EN of the Y address counter 26 to a high level for one clock period, and advances the Y address counter 26 by one count. Repeat the above operation, Y
When the address counter 26 reaches the value N1, the Y digital comparator 16 outputs a match signal YP, and the central controller switches to mode B shown in FIG.

In mode B, the same thing as in mode A is performed, but the lengths are (Nl + N3), (N1 + N3 + N4), (N1 + N3 + N4 + N5), (
N1+N3+ N4+ N5+ N6) , (N1+
N3+N4+N5+N5+NB+N7). In addition, the count content XC of the X address counter 24 is (N1+
N3) ≦xc< (N1+N3+N4), and (N1
+ N3+ N4+ N5)≦XC< (N1+N3+
During the period (N4+N5+N8), the central control unit reads predetermined image data from the image frame memory and
The difference is that the signal is sent to the D/A converter 11 shown in the figure via the data bus 10, and that the analog multi-flex circuit 12 in FIG. 4 is switched to the image signal side by the signal S.

The above operations are performed sequentially in C, D, and E modes, and when the image writing is completed, the Y address counter 26 is (10 M2 +
N3+N4+N5) and timeout output TO
issue. The JK flip-flop 21 is reset by this timeout output TO, and the input signal BS from the beam detection circuit 6 is blocked. At the same time, this output TO is Y
The contents of the address counter 26 are cleared to prepare for the next write. Also, within this time, Y digital comparator 1
A coincidence signal YP of 6 is sent to the central control unit to notify the end of writing.

In the above embodiment, the framing was controlled by the circuit shown in FIG. 5, and the image recording was performed by the image frame memory.
An image obtained by combining the frame and the image data may be stored in advance in the image frame memory. In this case, the frame memory functions as means for combining the image signal and the framing signal. In addition, in the example, an example of a four-part image was shown in which all areas outside the effective range of the image were blackened as shown in FIG. 3(a), but as shown in FIG. 6(a), the image of film F 4 where only the specified range along the periphery of the black area FB
Example of a divided image: As shown in FIG. 6(b), in order to make the boundary between the image and the black area FB clear, a thin line-shaped white area FW is provided at the boundary. can also be implemented using the same concept. Furthermore, the same idea can be applied not only to four-divided images but also to single or n-divided images.

As explained above, the image recording apparatus according to the present invention can blacken the margins of the recording sheet, that is, the outside of the effective range of the image,
When a recording sheet is observed using transmitted light of an observation light such as a Scherkasten, unnecessary transmitted light can be suppressed, making observation easier and causing less eye fatigue. In addition, it becomes observable even when the brightness of the shark stain is increased, which has the effect of expanding the dynamic range of the recording sheet.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a film recorded with a conventional multi-format camera, Fig. 2 and the following show an embodiment of the image recording device according to the present invention, Fig. 2 is its configuration diagram, and Fig. 3 (a)
is an explanatory diagram of a 4-split image, (b) is a waveform diagram combining the frame width and light beam brightness modulation signal, (c) is A-H of (a)
Figures 4 and 5 are circuit configuration diagrams of this embodiment, and Figures 6 (a) and (b) are diagrams of the width signal waveforms in the sub-scanning direction for each area, respectively. FIG. 3 is an explanatory diagram of a four-part image that is painted black and is composed of a black portion and a white portion. Reference numeral 1 is a laser oscillator, 2 is a light modulation element, 3 is a rotating polygon mirror, 5 is a drum, 6 is a beam detection circuit, 7 is a film detector, and 11 is a D/A converter. 12 is an analog multi-flip flop, 21.23 is a JK flip-flop, 24.26 is an address counter, 28.
29 is a digital comparator. Patent applicant Canon Co., Ltd. Figures 2 and 4

Claims (1)

[Scope of Claims] 1. An image recording apparatus that records an image on a recording sheet using a light beam scanning optical system, comprising means for combining an image signal with a preset framing signal, and the means for combining the image signal with a preset framing signal. An image recording apparatus characterized in that a specified range of the recording sheet along the periphery of the effective range of the image recording sheet is painted black. 2. The image recording apparatus according to claim 1, wherein the framing signal is a combination of a framing signal in the main scanning direction and a framing signal in the sub-scanning direction. 3. The image recording apparatus according to claim 1, wherein the image signal is read from an image frame memory. 4. The image recording apparatus according to claim 1, wherein all of the recording sheets are outside the effective range of the image. 5. The image recording apparatus according to claim 1, wherein a white part is provided around the black part outside the effective range of the image. 8. The image recording device according to claim 1, wherein a linear white portion is provided at a boundary between the effective range of the image and the blacked portion. 7. The image recording apparatus according to claim 1, wherein the image is divided into a plurality of images and recorded on one recording sheet.